Commit Graph

328 Commits

Author SHA1 Message Date
Xiubo Li
42fa98a9c3 pwm: fsl-ftm: Convert to direct regmap API usage
The regmap core supports different endian modes for devices. This patch
convert to direct regmap API usage, preparing to support big endianness
for LS1 SoC.

Using the regmap framework it will be easy to support devices that only
differ in endianness with the same device driver.

Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-08-20 10:10:12 +02:00
Xiubo Li
cd6d92d2aa pwm: fsl-ftm: Clean up the code
This patch intends to prepare for converting to direct regmap API usage.

Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-08-20 10:09:54 +02:00
Geert Uytterhoeven
d717ea73e3 pwm: Fix period and polarity in pwm_get() for non-perfect matches
If pwm_get() finds a look-up entry with a perfect match (both dev_id and
con_id match), the loop is aborted, and "p" still points to the correct
struct pwm_lookup.

If only an entry with a matching dev_id or con_id is found, the loop
terminates after traversing the whole list, and "p" now points to
arbitrary memory, not part of the pwm_lookup list.
Then pwm_set_period() and pwm_set_polarity() will set random values for
period resp. polarity.

To fix this, save period and polarity when finding a new best match,
just like is done for chip (for the provider) and index.

This fixes the LCD backlight on r8a7740/armadillo-legacy, which was fed
period 0 and polarity -1068821144 instead of 33333 resp. 1.

Fixes: 3796ce1d4d ("pwm: add period and polarity to struct pwm_lookup")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: stable@vger.kernel.org
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-08-18 10:58:43 +02:00
Linus Torvalds
34b20e6df6 pwm: Changes for v3.17-rc1
The set of changes for this merge window contains two new drivers: one
 for Rockchip SoCs and another for STMicroelectronics STiH4xx SoCs. The
 remainder of the changes are the usual small cleanups such as removing
 redundant OOM messages, signalling that a PWM chip's operations can
 sleep and removing an unneeded dependency.
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Merge tag 'pwm/for-3.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm

Pull pwm changes from Thierry Reding:
 "The set of changes for this merge window contains two new drivers: one
  for Rockchip SoCs and another for STMicroelectronics STiH4xx SoCs.

  The remainder of the changes are the usual small cleanups such as
  removing redundant OOM messages, signalling that a PWM chip's
  operations can sleep and removing an unneeded dependency"

* tag 'pwm/for-3.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm:
  pwm: rockchip: Added to support for RK3288 SoC
  pwm: rockchip: document RK3288 SoC compatible
  pwm: sti: Remove PWM period table
  pwm: sti: Sync between enable/disable calls
  pwm: sti: Ensure same period values for all channels
  pwm: sti: Fix PWM prescaler handling
  pwm: sti: Supply Device Tree binding documentation for ST's PWM IP
  pwm: sti: Add new driver for ST's PWM IP
  pwm: imx: set can_sleep flag for imx_pwm
  pwm: lpss: remove dependency on clk framework
  pwm: pwm-tipwmss: remove unnecessary OOM messages
  pwm: rockchip: document device tree bindings
  pwm: add Rockchip SoC PWM support
2014-08-08 18:06:29 -07:00
Caesar Wang
f630629908 pwm: rockchip: Added to support for RK3288 SoC
This patch added to support the PWM controller found on
RK3288 SoC.

Signed-off-by: Caesar Wang <caesar.wang@rock-chips.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-08-08 13:12:47 +02:00
Ajit Pal Singh
3aacd3e187 pwm: sti: Remove PWM period table
Removes the PWM period table. Instead the prescaler is computed
from the period value passed in the config() function.

Signed-off-by: Ajit Pal Singh <ajitpal.singh@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-08-08 13:12:46 +02:00
Ajit Pal Singh
6ad6b838e1 pwm: sti: Sync between enable/disable calls
ST PWM IP has a common enable/disable control for all the PWM
channels on a PWM cell. Disables PWM output on the PWM HW only
when disable is called for the last channel.

Signed-off-by: Ajit Pal Singh <ajitpal.singh@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-08-08 13:12:45 +02:00
Ajit Pal Singh
5165166e8a pwm: sti: Ensure same period values for all channels
ST PWM IP shares the same clock prescaler across all the PWM
channels. Hence configuration requests which change the period
will affect all the channels. Do not allow period changes which
will stomp period settings of the already configured channels.

Signed-off-by: Ajit Pal Singh <ajitpal.singh@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-08-08 13:12:45 +02:00
Ajit Pal Singh
bf9cc80b6c pwm: sti: Fix PWM prescaler handling
This patch fixes the pwm driver to write the complete 8 bits of
the prescaler value to the PWM Control register.

Signed-off-by: Ajit Pal Singh <ajitpal.singh@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-08-08 13:12:40 +02:00
Lee Jones
378fe115d1 pwm: sti: Add new driver for ST's PWM IP
This driver supports all current STi platforms' PWM IPs.

Signed-off-by: Ajit Pal Singh <ajitpal.singh@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
[thierry.reding: rename module to pwm-sti, fix build breakage]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-08-07 16:18:27 +02:00
Shawn Guo
31c4fa3442 pwm: imx: set can_sleep flag for imx_pwm
The .config() hook imx_pwm_config() calls clk APIs like clk_prepare()
and clk_get_rate(), which might sleep, so we need to set can_sleep flag
on pwm_chip.

Signed-off-by: Shawn Guo <shawn.guo@freescale.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-08-07 13:22:44 +02:00
Heikki Krogerus
65accd8738 pwm: lpss: remove dependency on clk framework
Unlike other Intel LPSS devices, the PWM does not have the
clock dividers or the gate. All we get from the clock is the
rate. Since PCI case uses the driver data to get the rate,
we can drop the clk and use the same data also in case of
ACPI. The frequency is the same.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Chew, Chiau Ee <chiau.ee.chew@intel.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-08-07 13:18:03 +02:00
Jingoo Han
ed1a819a3f pwm: pwm-tipwmss: remove unnecessary OOM messages
The site-specific OOM messages are unnecessary, because they
duplicate the MM subsystem generic OOM message. The following
checkpatch warning is also removed.

  WARNING: Possible unnecessary 'out of memory' message

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-08-07 13:14:33 +02:00
Beniamino Galvani
101353c82a pwm: add Rockchip SoC PWM support
This commit adds a driver for the PWM controller found on Rockchip
RK29, RK30 and RK31 SoCs.

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-07-11 15:54:51 +02:00
Alexandre Belloni
bb4bbbaae2 PWM: atmel: allow building for AVR32
The Atmel PWM IP can be found on avr32 chips. This allows selecting and building
the driver on avr32.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
2014-07-09 15:13:31 +02:00
Linus Torvalds
7f33e7241d pwm: Changes for v3.16-rc1
The majority of these changes are cleanups and fixes across all drivers.
 Redundant error messages are removed and more PWM controllers set the
 .can_sleep flag to signal that they can't be used in atomic context.
 
 Support is added for the Broadcom Kona family of SoCs and the Intel LPSS
 driver can now probe PCI devices in addition to ACPI devices. Upon shut-
 down, the pwm-backlight driver will now power off the backlight. It also
 uses the new descriptor-based GPIO API for more concise GPIO handling.
 
 A large chunk of these changes also converts platforms to use the lookup
 mechanism rather than relying on the global number space to reference
 PWM devices. This is largely in preparation for more unification and
 cleanups in future patches. Eventually it will allow the legacy PWM API
 to be removed.
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Merge tag 'pwm/for-3.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm

Pull pwm changes from Thierry Reding:
 "The majority of these changes are cleanups and fixes across all
  drivers.  Redundant error messages are removed and more PWM
  controllers set the .can_sleep flag to signal that they can't be used
  in atomic context.

  Support is added for the Broadcom Kona family of SoCs and the Intel
  LPSS driver can now probe PCI devices in addition to ACPI devices.
  Upon shutdown, the pwm-backlight driver will now power off the
  backlight.  It also uses the new descriptor-based GPIO API for more
  concise GPIO handling.

  A large chunk of these changes also converts platforms to use the
  lookup mechanism rather than relying on the global number space to
  reference PWM devices.  This is largely in preparation for more
  unification and cleanups in future patches.  Eventually it will allow
  the legacy PWM API to be removed"

* tag 'pwm/for-3.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm: (38 commits)
  pwm: fsl-ftm: set pwm_chip can_sleep flag
  pwm: ab8500: Fix wrong value shift for disable/enable PWM
  pwm: samsung: do not set manual update bit in pwm_samsung_config
  pwm: lp3943: Set pwm_chip can_sleep flag
  pwm: atmel: set pwm_chip can_sleep flag
  pwm: mxs: set pwm_chip can_sleep flag
  pwm: tiehrpwm: inline accessor functions
  pwm: tiehrpwm: don't build PM related functions when not needed
  pwm-backlight: retrieve configured PWM period
  leds: leds-pwm: retrieve configured PWM period
  ARM: pxa: hx4700: use PWM_LOOKUP to initialize struct pwm_lookup
  ARM: shmobile: armadillo: use PWM_LOOKUP to initialize struct pwm_lookup
  ARM: OMAP3: Beagle: use PWM_LOOKUP to initialize struct pwm_lookup
  pwm: modify PWM_LOOKUP to initialize all struct pwm_lookup members
  ARM: pxa: hx4700: initialize all the struct pwm_lookup members
  ARM: OMAP3: Beagle: initialize all the struct pwm_lookup members
  pwm: renesas-tpu: remove unused struct tpu_pwm_platform_data
  ARM: shmobile: armadillo: initialize all struct pwm_lookup members
  pwm: add period and polarity to struct pwm_lookup
  pwm: twl: Really disable twl6030 PWMs
  ...
2014-06-11 14:06:55 -07:00
Axel Lin
39fd3f99ab pwm: fsl-ftm: set pwm_chip can_sleep flag
The implementation of .config(), .enable() and .disable() operations in this
driver may sleep, thus set pwm_chip can_sleep flag.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-05-23 09:11:21 +02:00
Axel Lin
54b02347d7 pwm: ab8500: Fix wrong value shift for disable/enable PWM
Current code only works when pdev->id is 1. Fix it by passing correct
bit values to abx500_mask_and_set_register_interruptible().

Having DISABLE_PWM/ENABLE_PWM does not make the code more readable
because the bit values depend on pdev->id. Thus drop the DISABLE_PWM
and ENABLE_PWM defines.

This patch also removes an unnecessary return in ab8500_pwm_disable().

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Alexandre BOURDIOL <alexandre.bourdiol@st.com>
Acked-by: Philippe Begnic <philippe.begnic@st.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-05-21 12:29:58 +02:00
Ajay Kumar
3bdf878102 pwm: samsung: do not set manual update bit in pwm_samsung_config
pwm_samsung_config() sets the manual update bit via a call to the
pwm_samsung_enable() function even when the channel is already running.
This causes noticable flicker on display if we try to change the
backlight brightness from minimum to maximum, continuously.

So, we remove the call to pwm_samsung_enable() from pwm_samsung_config
to avoid the flicker and this change doesn't harm normal working since
the pwm-backlight driver already calls pwm_samsung_enable() where
needed.

Signed-off-by: Ajay Kumar <ajaykumar.rs@samsung.com>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-05-21 12:24:00 +02:00
Axel Lin
00afb429fc pwm: lp3943: Set pwm_chip can_sleep flag
Read/write through I2C can sleep, thus set pwm_chip can_sleep flag.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-05-21 12:09:09 +02:00
Alexandre Belloni
cf3a384b34 pwm: atmel: set pwm_chip can_sleep flag
atmel_pwm_config() calls clk_get_rate() which might sleep, so we need to
set pwm_chip can_sleep flag.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-05-21 12:08:57 +02:00
Shawn Guo
bd9c1b6005 pwm: mxs: set pwm_chip can_sleep flag
The .config() calls clk_get_rate() which might sleep, so we need to set
pwm_chip can_sleep flag.  Otherwise, we see the following warning when
using PWM driven heartbeat led.

WARNING: CPU: 0 PID: 0 at kernel/locking/mutex.c:856 mutex_trylock+0x184/0x1a4()
DEBUG_LOCKS_WARN_ON(in_interrupt())
Modules linked in:
CPU: 0 PID: 0 Comm: swapper Not tainted 3.14.0-rc5 
[<c0015420>] (unwind_backtrace) from [<c0012cb0>] (show_stack+0x10/0x14)
[<c0012cb0>] (show_stack) from [<c001daf8>] (warn_slowpath_common+0x6c/0x8c)
[<c001daf8>] (warn_slowpath_common) from [<c001dbac>] (warn_slowpath_fmt+0x30/0x40)
[<c001dbac>] (warn_slowpath_fmt) from [<c045df74>] (mutex_trylock+0x184/0x1a4)
[<c045df74>] (mutex_trylock) from [<c0360950>] (clk_prepare_lock+0xc/0xec)
[<c0360950>] (clk_prepare_lock) from [<c0362020>] (clk_get_rate+0xc/0x68)
[<c0362020>] (clk_get_rate) from [<c028d07c>] (mxs_pwm_config+0x20/0x198)
[<c028d07c>] (mxs_pwm_config) from [<c028bde8>] (pwm_config+0x60/0x70)
[<c028bde8>] (pwm_config) from [<c034b61c>] (__led_pwm_set+0x1c/0x3c)
[<c034b61c>] (__led_pwm_set) from [<c034bc3c>] (led_heartbeat_function+0x70/0x110)
[<c034bc3c>] (led_heartbeat_function) from [<c00292f0>] (call_timer_fn+0x7c/0x164)
[<c00292f0>] (call_timer_fn) from [<c00295c8>] (run_timer_softirq+0x1f0/0x260)
[<c00295c8>] (run_timer_softirq) from [<c002255c>] (__do_softirq+0xc4/0x2f0)
[<c002255c>] (__do_softirq) from [<c0022890>] (irq_exit+0xa4/0x10c)
[<c0022890>] (irq_exit) from [<c0010240>] (handle_IRQ+0x34/0x84)
[<c0010240>] (handle_IRQ) from [<c0013524>] (__irq_svc+0x44/0x54)
[<c0013524>] (__irq_svc) from [<c00107f8>] (arch_cpu_idle+0x40/0x48)
[<c00107f8>] (arch_cpu_idle) from [<c005deb8>] (cpu_startup_entry+0x70/0x198)
[<c005deb8>] (cpu_startup_entry) from [<c060aac8>] (start_kernel+0x2a8/0x2f8)

Reported-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-05-21 12:08:27 +02:00
Wolfram Sang
3ea57ea669 pwm: tiehrpwm: inline accessor functions
These elementary functions should be inlined for fastest access. Also
fixes this warning as a side-effect (when no PM_SLEEP is selected):

drivers/pwm/pwm-tiehrpwm.c:141:12: warning: 'ehrpwm_read' defined but not used [-Wunused-function]

Signed-off-by: Wolfram Sang <wsa@sang-engineering.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-05-21 11:51:26 +02:00
Wolfram Sang
af5935ec12 pwm: tiehrpwm: don't build PM related functions when not needed
Fixes following warnings on AM335X with no PM_SLEEP

drivers/pwm/pwm-tiehrpwm.c:534:13: warning: 'ehrpwm_pwm_save_context' defined but not used [-Wunused-function]
drivers/pwm/pwm-tiehrpwm.c:548:13: warning: 'ehrpwm_pwm_restore_context' defined but not used [-Wunused-function]

Signed-off-by: Wolfram Sang <wsa@sang-engineering.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-05-21 11:51:26 +02:00
Alexandre Belloni
dc67115713 pwm: renesas-tpu: remove unused struct tpu_pwm_platform_data
The struct is not used anymore and the polarity initialization will be
done using the PWM lookup table (or device tree).

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-05-21 11:19:29 +02:00
Alexandre Belloni
3796ce1d4d pwm: add period and polarity to struct pwm_lookup
Add period and polarity members to struct pwm_lookup so that platforms
using the lookup table can be treated the same way as those using the
device tree.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-05-21 09:03:07 +02:00
Axel Lin
9c88669c2c pwm: twl: Really disable twl6030 PWMs
Current twl6030_pwm_disable() implementation writes TWL6030_TOGGLE3_REG
twice, the second write sets TWL6030_PWMXEN bits so the PWM clock does
not disable.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-05-08 23:41:47 +02:00
Thierry Reding
89c0339e0a pwm: lpss: Fix const qualifier and sparse warnings
Fixes the following warnings reported by the 0-DAY kernel build testing
backend:

   drivers/pwm/pwm-lpss.c: In function 'pwm_lpss_probe_pci':
>> drivers/pwm/pwm-lpss.c:192:2: warning: passing argument 3 of 'pwm_lpss_probe' discards 'const' qualifier from pointer target type [enabled by default]
     lpwm = pwm_lpss_probe(&pdev->dev, &pdev->resource[0], info);
     ^
   drivers/pwm/pwm-lpss.c:130:30: note: expected 'struct pwm_lpss_boardinfo *' but argument is of type 'const struct pwm_lpss_boardinfo *'
    static struct pwm_lpss_chip *pwm_lpss_probe(struct device *dev,
                                 ^
>> drivers/pwm/pwm-lpss.c:143:28: sparse: incorrect type in return expression (different address spaces)
   drivers/pwm/pwm-lpss.c:143:28:    expected struct pwm_lpss_chip *
   drivers/pwm/pwm-lpss.c:143:28:    got void [noderef] <asn:2>*regs
>> drivers/pwm/pwm-lpss.c:192:63: sparse: incorrect type in argument 3 (different modifiers)
   drivers/pwm/pwm-lpss.c:192:63:    expected struct pwm_lpss_boardinfo *info
   drivers/pwm/pwm-lpss.c:192:63:    got struct pwm_lpss_boardinfo const *[assigned] info
   drivers/pwm/pwm-lpss.c: In function 'pwm_lpss_probe_pci':
   drivers/pwm/pwm-lpss.c:192:2: warning: passing argument 3 of 'pwm_lpss_probe' discards 'const' qualifier from pointer target type [enabled by default]
     lpwm = pwm_lpss_probe(&pdev->dev, &pdev->resource[0], info);
     ^
   drivers/pwm/pwm-lpss.c:130:30: note: expected 'struct pwm_lpss_boardinfo *' but argument is of type 'const struct pwm_lpss_boardinfo *'
    static struct pwm_lpss_chip *pwm_lpss_probe(struct device *dev,
                                 ^

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-05-07 10:27:57 +02:00
Beniamino Galvani
5b1e8e0653 pwm: spear: fix check on pwmchip_add() return value
pwmchip_add() returns zero on success and a negative value on error,
so the condition of the check must be inverted.

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-05-07 10:21:05 +02:00
Alan Cox
093e00bb3f pwm: lpss: Add support for PCI devices
Not all systems enumerate the PWM devices via ACPI. They can also be
exposed via the PCI interface.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Chew, Chiau Ee <chiau.ee.chew@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-04-28 13:47:03 +02:00
Jingoo Han
b9f87404dd pwm: vt8500: Remove unnecessary OOM messages
The site-specific OOM messages are unnecessary, because they
duplicate the MM subsystem generic OOM message.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-04-28 13:37:48 +02:00
Jingoo Han
5e34895392 pwm: tiehrpwm: Remove unnecessary OOM messages
The site-specific OOM messages are unnecessary, because they
duplicate the MM subsystem generic OOM message.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-04-28 13:37:48 +02:00
Jingoo Han
c10d50631f pwm: pwm-tiecap: Remove unnecessary OOM messages
The site-specific OOM messages are unnecessary, because they
duplicate the MM subsystem generic OOM message.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-04-28 13:37:48 +02:00
Jingoo Han
474b69025d pwm: tegra: Remove unnecessary OOM messages
The site-specific OOM messages are unnecessary, because they
duplicate the MM subsystem generic OOM message.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-04-28 13:37:48 +02:00
Jingoo Han
9321fe9dbe pwm: spear: Remove unnecessary OOM messages
The site-specific OOM messages are unnecessary, because they
duplicate the MM subsystem generic OOM message.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-04-28 13:37:48 +02:00
Jingoo Han
6c5059ccce pwm: renesas-tpu: Remove unnecessary OOM messages
The site-specific OOM messages are unnecessary, because they
duplicate the MM subsystem generic OOM message.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-04-28 13:37:48 +02:00
Jingoo Han
d93fc78f47 pwm: pxa: Remove unnecessary OOM messages
The site-specific OOM messages are unnecessary, because they
duplicate the MM subsystem generic OOM message.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-04-28 13:37:48 +02:00
Jingoo Han
1cbec749bf pwm: i.MX: Remove unnecessary OOM messages
The site-specific OOM messages are unnecessary, because they
duplicate the MM subsystem generic OOM message.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-04-28 13:37:47 +02:00
Jingoo Han
a2fc1db61a pwm: ab8500: Remove unnecessary OOM messages
The site-specific OOM messages are unnecessary, because they
duplicate the MM subsystem generic OOM message.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-04-28 13:37:47 +02:00
Tim Kryger
6a4e4bff96 pwm: kona: Introduce Kona PWM controller support
Add support for the six-channel Kona PWM controller found on Broadcom
mobile SoCs like bcm281xx.

Signed-off-by: Tim Kryger <tim.kryger@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Reviewed-by: Markus Mayer <markus.mayer@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-04-28 13:07:44 +02:00
Viresh Kumar
9cc236827f Shiraz has moved
shiraz.hashim@st.com email-id doesn't exist anymore as he has left the
company.  Replace ST's id with shiraz.linux.kernel@gmail.com.

It also updates .mailmap file to fix address for 'git shortlog'.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Shiraz Hashim <shiraz.linux.kernel@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-04-18 16:40:08 -07:00
Linus Torvalds
9712d3c377 pwm: Changes for v3.15-rc1
The legacy HAVE_PWM Kconfig symbol is finally being retired. Thanks a
 lot to Sascha Hauer for doing that.
 
 Three new drivers are added: Freescale FTM, Cirrus Logic CLPS711X and
 Intel Low Power Subsystem.
 
 An assortment of fixes and cleanups rounds things off for this release
 cycle.
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Merge tag 'pwm/for-3.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm

Pull pwm changes from Thierry Reding:
 "The legacy HAVE_PWM Kconfig symbol is finally being retired.  Thanks a
  lot to Sascha Hauer for doing that.

  Three new drivers are added: Freescale FTM, Cirrus Logic CLPS711X and
  Intel Low Power Subsystem.

  An assortment of fixes and cleanups rounds things off for this release
  cycle"

* tag 'pwm/for-3.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm:
  pwm: pxa: Constify OF match table
  pwm: pxa: Fix typo "pwm" -> "PWM"
  Revert "pwm: pxa: Use of_match_ptr()"
  pwm: add support for Intel Low Power Subsystem PWM
  pwm: Add CLPS711X PWM support
  pwm: atmel: correct CDTY calculation
  pwm: atmel: Fix polarity handling
  Documentation: Add device tree bindings for Freescale FTM PWM.
  pwm: Add Freescale FTM PWM driver support
  pwm: pxa: Use of_match_ptr()
  pwm: samsung: Use SIMPLE_DEV_PM_OPS macro
  pwm: renesas-tpu: Add dependency on HAS_IOMEM
  pwm: Remove obsolete HAVE_PWM Kconfig symbol
2014-04-05 18:32:31 -07:00
Thierry Reding
2ae69a4604 pwm: pxa: Constify OF match table
The table is never modified and all OF functions that use it take a
const struct of_device_id *.

Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-04-01 14:06:43 +02:00
Thierry Reding
fdec4f7271 pwm: pxa: Fix typo "pwm" -> "PWM"
Being an abbreviation, PWM should always be capitalized in prose.

Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-04-01 14:04:59 +02:00
Thierry Reding
f409cd3833 Revert "pwm: pxa: Use of_match_ptr()"
This reverts commit 8468949cdd.

The OF match table dummy for non-OF configurations cannot be removed
because it is still used by the pxa_pwm_get_id_dt() function.

Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-04-01 14:01:32 +02:00
Mika Westerberg
d16a5aa9e8 pwm: add support for Intel Low Power Subsystem PWM
Add support for Intel Low Power I/O subsystem PWM controllers found on
Intel BayTrail SoC.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Chew, Kean Ho <kean.ho.chew@intel.com>
Signed-off-by: Chang, Rebecca Swee Fun <rebecca.swee.fun.chang@intel.com>
Signed-off-by: Chew, Chiau Ee <chiau.ee.chew@intel.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-04-01 12:03:40 +02:00
Alexander Shiyan
7eb3f6ffb5 pwm: Add CLPS711X PWM support
Add a new driver for the ARM CLPS711X Pulse Width Modulator (PWM) interface.
This CPU contain two 4-bit PWM outputs with constant period, based on CPU
PLL frequency. PWM polarity is determined by hardware by power on reset.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-03-18 21:15:16 +01:00
Alexandre Belloni
916030db43 pwm: atmel: correct CDTY calculation
From the datasheet, the actual duty cycle is:

	(period - (1 / clk) * CDTY) / period

This actually correct the polarity of the PWM and solves the issue that
pwm-leds exhibits: when setting a duty cycle of 0 and then disabling a
channel, the level was wrong (1 when the polarity was normal and 0 when
the polarity was inversed).

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-03-18 20:47:48 +01:00
Alexandre Belloni
8db9e29fe5 pwm: atmel: Fix polarity handling
When atmel_pwm_config() calculates and then sets the prescaler, it is
overwriting the channel's CMR register so we are losing the CPOL
configuration.

As atmel_pwm_config() is always called before enabling a channel,
inverting the polarity doesn't work.

Fix that by reading CMR first and only overwriting the prescaler bits.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-03-18 20:47:31 +01:00
Xiubo Li
b505183b51 pwm: Add Freescale FTM PWM driver support
The FTM PWM device can be found on Vybrid VF610 Tower and
Layerscape LS-1 SoCs.

Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: Alison Wang <b18965@freescale.com>
Signed-off-by: Jingchang Lu <b35083@freescale.com>
Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: Yuan Yao <yao.yuan@freescale.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-03-18 18:01:56 +01:00
Jingoo Han
8468949cdd pwm: pxa: Use of_match_ptr()
Use of_match_ptr(), because of_match_ptr() returns NULL pointer
when CONFIG_OF is disabled.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-02-26 16:14:57 +01:00
Jingoo Han
4407b6d243 pwm: samsung: Use SIMPLE_DEV_PM_OPS macro
Use SIMPLE_DEV_PM_OPS macro in order to make the code simpler.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-02-26 16:14:57 +01:00
Richard Weinberger
2974b09860 pwm: renesas-tpu: Add dependency on HAS_IOMEM
On archs like S390 or um this driver cannot build nor work.
Make it depend on HAS_IOMEM to bypass build failures.

drivers/built-in.o: In function `tpu_probe':
drivers/pwm/pwm-renesas-tpu.c:421: undefined reference to `devm_ioremap_resource'

Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-02-26 16:14:42 +01:00
Christian Engelmayer
0b7d25c347 pwm: lp3943: Fix potential memory leak during request
Fix a memory leak in the lp3943_pwm_request_map() error handling path.
Make sure already allocated pwm map memory is freed correctly.
Detected by Coverity: CID 1162829.

Signed-off-by: Christian Engelmayer <cengelma@gmx.at>
Acked-by: Milo Kim <milo.kim@ti.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-02-26 15:45:12 +01:00
Linus Torvalds
398b60a8de pwm: Changes for v3.14-rc1
The patches for this release cycle include various enhancements (device
 tree support, better compile coverage, ...) for existing drivers. There
 is a new driver for Atmel SoCs.
 
 Various drivers as well as the sysfs support received minor fixes and
 cleanups.
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Merge tag 'pwm/for-3.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm

Pull pwm changes from Thierry Reding:
 "The patches for this release cycle include various enhancements
  (device tree support, better compile coverage, ...) for existing
  drivers.  There is a new driver for Atmel SoCs.

  Various drivers as well as the sysfs support received minor fixes and
  cleanups"

* tag 'pwm/for-3.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm:
  pwm: tiecap: Remove duplicate put_sync call
  pwm: tiehrpwm: use dev_err() instead of pr_err()
  pwm: pxa: remove unnecessary space before tabs
  pwm: ep93xx: split module author names
  pwm: use seq_puts() instead of seq_printf()
  pwm: atmel-pwm: Do not unprepare clock after successful registration
  of: Add Atmel PWM controller device tree binding
  pwm: atmel-pwm: Add Atmel PWM controller driver
  backlight: pwm_bl: Remove error message upon devm_kzalloc() failure
  pwm: pca9685: depends on I2C rather than REGMAP_I2C
  pwm: renesas-tpu: Enable driver compilation with COMPILE_TEST
  pwm: jz4740: Use devm_clk_get()
  pwm: jz4740: Pass device to clk_get()
  pwm: sysfs: Convert to use ATTRIBUTE_GROUPS macro
  pwm: pxa: Add device tree support
2014-01-27 08:15:51 -08:00
Sourav Poddar
6691a19966 pwm: tiecap: Remove duplicate put_sync call
Remove duplicate 'pm_runtime_put_sync' in the remove path.

Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2014-01-23 15:19:18 +01:00
Milo Kim
af66b3c093 pwm: Add LP3943 PWM driver
This is the other of the LP3943 MFD driver.
LP3943 can be used as a PWM generator, up to 2 channels.

* Two PWM generators supported

* Supported PWM operations
  request, free, config, enable and disable

* Pin assignment
  A driver data, 'pin_used' is checked when a PWM is requested.
  If the output pin is already assigned, then returns as failure.
  If the pin is available, 'pin_used' is set.
  When the PWM is not used anymore, then it is cleared.
  It is defined as unsigned long type for atomic bit operation APIs,
  but only LSB 16bits are used because LP3943 has 16 outputs.

Signed-off-by: Milo Kim <milo.kim@ti.com>
Acked-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2014-01-21 08:28:00 +00:00
Jingoo Han
82569e5b22 pwm: tiehrpwm: use dev_err() instead of pr_err()
Use dev_err() instead of pr_err() to provide a better message
to userspace.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-12-20 11:03:17 +01:00
Jingoo Han
b07ab66391 pwm: pxa: remove unnecessary space before tabs
Remove unnecessary space before tabs in order to fix the following
checkpatch warning.

  WARNING: please, no space before tabs

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-12-20 10:53:55 +01:00
Jingoo Han
5eabf82ecf pwm: ep93xx: split module author names
Split module author names in order to fix the following
checkpatch warning.

  WARNING: quoted string split across lines

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-12-20 10:53:50 +01:00
Jingoo Han
adcba1e3a5 pwm: use seq_puts() instead of seq_printf()
For a constant format without additional arguments, use seq_puts()
instead of seq_printf(). Also, the following checkpatch warning is
fixed.

  WARNING: Prefer seq_puts to seq_printf

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-12-20 10:53:41 +01:00
Bo Shen
6a6833563f pwm: atmel-pwm: Do not unprepare clock after successful registration
When the PWM controller is registered successfully, the clock can not
unprepare, so fix it.

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-12-20 10:48:43 +01:00
Bo Shen
32b16d46e4 pwm: atmel-pwm: Add Atmel PWM controller driver
Add a PWM framework driver for the PWM controller found on Atmel SoCs.

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
[thierry.reding: coding style and other minor cleanups]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-12-17 11:26:42 +01:00
Axel Lin
2c80a4923a pwm: pca9685: depends on I2C rather than REGMAP_I2C
REGMAP_I2C is not a visible config option.
Thus make PWM_PCA9685 depend on I2c and then select REGMAP_I2C.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-12-17 10:18:07 +01:00
Laurent Pinchart
94d88d63c6 pwm: renesas-tpu: Enable driver compilation with COMPILE_TEST
This helps increasing build testing coverage.

Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: linux-pwm@vger.kernel.org
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-12-12 13:36:38 +01:00
Lars-Peter Clausen
0dc1135fdf pwm: jz4740: Use devm_clk_get()
Using the managed version of clk_get() makes the code a bit shorter and the
error paths less complicated.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-12-12 13:23:23 +01:00
Lars-Peter Clausen
078c6ac1bd pwm: jz4740: Pass device to clk_get()
In preparation to switching the jz4740 clk driver to the common clk framework
make sure to pass the device to clk_get().

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-12-12 13:23:23 +01:00
Axel Lin
6ca142ad0d pwm: sysfs: Convert to use ATTRIBUTE_GROUPS macro
Use new ATTRIBUTE_GROUPS macro to reduce the number of lines of code.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-12-04 11:35:28 +01:00
Mike Dunn
b52fa7bc5d pwm: pxa: Add device tree support
This patch adds device tree support to the PXA's PWM driver.  Nothing
needs to be extracted from the device tree node by the PWM device.
Client devices need only specify the period; the per-chip index is
implicitly zero because one device node must be present for each PWM
output in use.  This approach is more convenient due to the wide
variability in the number of PWM channels present across the various PXA
variants, and is made possible by the fact that the register sets for
each PWM channel are segregated from each other.  An of_xlate() method
is added to parse this single-cell node.  The existing ID table is
reused for the match table data.

Tested on a Palm Treo 680 (both platform data and DT cases).

Signed-off-by: Mike Dunn <mikedunn@newsguy.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-12-04 10:18:52 +01:00
Sachin Kamat
b577cdcf17 pwm: samsung: Fix kernel warning while unexporting a channel
PWM channel data was set to NULL before freeing it. This caused the
following kernel warning while unexporting the channel. Set the channel
data to NULL after freeing it.

[   70.495000] WARNING: CPU: 0 PID: 1 at drivers/base/devres.c:805 pwm_put+0x48/0x80()
[   70.505000] Modules linked in:
[   70.505000] CPU: 0 PID: 1 Comm: sh Not tainted 3.12.0-rc6-next-20131024-00012-gd4aec04-dirty 
[   70.515000] [<c0014ddc>] (unwind_backtrace+0x0/0xf4) from [<c0011784>] (show_stack+0x10/0x14)
[   70.525000] [<c0011784>] (show_stack+0x10/0x14) from [<c03a3cbc>] (dump_stack+0x7c/0xb0)
[   70.530000] [<c03a3cbc>] (dump_stack+0x7c/0xb0) from [<c001de68>] (warn_slowpath_common+0x6c/0x88)
[   70.540000] [<c001de68>] (warn_slowpath_common+0x6c/0x88) from [<c001df20>] (warn_slowpath_null+0x1c/0x24)
[   70.550000] [<c001df20>] (warn_slowpath_null+0x1c/0x24) from [<c01d1af8>] (pwm_put+0x48/0x80)
[   70.560000] [<c01d1af8>] (pwm_put+0x48/0x80) from [<c01d21c8>] (pwm_unexport_store+0x94/0xac)
[   70.565000] [<c01d21c8>] (pwm_unexport_store+0x94/0xac) from [<c010991c>] (sysfs_write_file+0x148/0x1d8)
[   70.575000] [<c010991c>] (sysfs_write_file+0x148/0x1d8) from [<c00b2a80>] (vfs_write+0xb4/0x1a0)
[   70.585000] [<c00b2a80>] (vfs_write+0xb4/0x1a0) from [<c00b3068>] (SyS_write+0x3c/0x78)
[   70.595000] [<c00b3068>] (SyS_write+0x3c/0x78) from [<c000e2e0>] (ret_fast_syscall+0x0/0x30)

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Reviewed-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-11-01 11:17:57 +01:00
H Hartley Sweeten
a230869817 pwm: add ep93xx PWM support
Remove the non-standard EP93xx PWM driver in drivers/misc and add
a new driver for the PWM controllers on the EP93xx platform based
on the PWM framework.

These PWM controllers each support 1 PWM channel with programmable
duty cycle, frequency, and polarity inversion.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ryan Mallon <rmallon@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-10-17 16:07:19 +02:00
Wolfram Sang
faed9c3808 pwm: don't use devm_pinctrl_get_select_default() in probe
Since commit ab78029 (drivers/pinctrl: grab default handles from device core),
we can rely on device core for setting the default pins. Compile tested only.

Acked-by: Linus Walleij <linus.walleij@linaro.org> (personally at LCE13)
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-10-15 12:16:35 +02:00
Sachin Kamat
becbca1390 pwm: imx: Remove redundant of_match_ptr
The data structure of_match_ptr() protects is always compiled in.
Hence of_match_ptr() is not needed.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-10-08 15:49:38 +02:00
Sachin Kamat
3cb3b2bfdd pwm: lpc32xx: Remove redundant of_match_ptr
The data structure of_match_ptr() protects is always compiled in.
Hence of_match_ptr() is not needed.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Cc: Alexandre Pereira da Silva <aletes.xgr@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-10-08 15:49:19 +02:00
Sachin Kamat
de02cb887c pwm: mxs: Remove redundant of_match_ptr
The data structure of_match_ptr() protects is always compiled in.
Hence of_match_ptr() is not needed.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-10-08 15:49:10 +02:00
Sachin Kamat
ea8eeb1502 pwm: twl: Include linux/of.h header
'of_match_ptr' is defined in linux/of.h. Include it explicitly.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-10-08 15:45:44 +02:00
Sachin Kamat
e852340dee pwm: twl-led: Include linux/of.h header
'of_match_ptr' is defined in linux/of.h. Include it explicitly.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-10-08 15:45:44 +02:00
Sachin Kamat
c3bdfe1f1e pwm: samsung: Include linux/of.h header
'of_match_ptr' is defined in linux/of.h. Include it explicitly.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-10-08 15:45:44 +02:00
Sachin Kamat
2a8876cfdf pwm: imx: Include linux/of.h header
'of_match_ptr' is defined in linux/of.h. Include it explicitly.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-10-08 15:45:44 +02:00
Boris BREZILLON
ceb12f9398 pwm: atmel-tcb: fix max time computation for slow clk source
Use the the tcb counter width to compute the maximum time that can be
represented using the slow clock source instead of the static 16 bit width.

Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-09-19 14:04:32 +02:00
Boris BREZILLON
f3a82170ae pwm: atmel-tcb: add missing clk source config
Clock source changes are never applied to the CMR register.
This may lead to wrong period/duty cycle configuration.

Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-09-19 14:04:24 +02:00
Linus Torvalds
8e73e367f7 ARM: SoC cleanups for 3.12
This branch contains code cleanups, moves and removals for 3.12.
 
 There's a large number of various cleanups, and a nice net removal of
 13500 lines of code.
 
 Highlights worth mentioning are:
 
 - A series of patches from Stephen Boyd removing the ARM local timer API.
 - Move of Qualcomm MSM IOMMU code to drivers/iommu.
 - Samsung PWM driver cleanups from Tomasz Figa, removing legacy PWM driver
   and switching over to the drivers/pwm one.
 - Removal of some unusued auto-generated headers for OMAP2+ (PRM/CM).
 
 There's also a move of a header file out of include/linux/i2c/ to
 platform_data, where it really belongs. It touches mostly ARM platform
 code for include changes so we took it through our tree.
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Merge tag 'cleanup-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc

Pull ARM SoC cleanups from Olof Johansson:
 "This branch contains code cleanups, moves and removals for 3.12.

  There's a large number of various cleanups, and a nice net removal of
  13500 lines of code.

  Highlights worth mentioning are:

   - A series of patches from Stephen Boyd removing the ARM local timer
     API.
   - Move of Qualcomm MSM IOMMU code to drivers/iommu.
   - Samsung PWM driver cleanups from Tomasz Figa, removing legacy PWM
     driver and switching over to the drivers/pwm one.
   - Removal of some unusued auto-generated headers for OMAP2+ (PRM/CM).

  There's also a move of a header file out of include/linux/i2c/ to
  platform_data, where it really belongs.  It touches mostly ARM
  platform code for include changes so we took it through our tree"

* tag 'cleanup-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (83 commits)
  ARM: OMAP2+: Add back the define for AM33XX_RST_GLOBAL_WARM_SW_MASK
  gpio: (gpio-pca953x) move header to linux/platform_data/
  arm: zynq: hotplug: Remove unreachable code
  ARM: SAMSUNG: Remove unnecessary exynos4_default_sdhci*()
  tegra: simplify use of devm_ioremap_resource
  ARM: SAMSUNG: Remove plat/regs-timer.h header
  ARM: SAMSUNG: Remove remaining uses of plat/regs-timer.h header
  ARM: SAMSUNG: Remove pwm-clock infrastructure
  ARM: SAMSUNG: Remove old PWM timer platform devices
  pwm: Remove superseded pwm-samsung-legacy driver
  ARM: SAMSUNG: Modify board files to use new PWM platform device
  ARM: SAMSUNG: Rework private data handling in dev-backlight
  pwm: Add new pwm-samsung driver
  ARM: mach-mvebu: remove redundant DT parsing and validation
  ARM: msm: Only compile io.c on platforms that use it
  iommu/msm: Move mach includes to iommu directory
  ARM: msm: Remove devices-iommu.c
  ARM: msm: Move mach/board.h contents to common.h
  ARM: msm: Migrate msm_timer to CLOCKSOURCE_OF_DECLARE
  ARM: msm: Remove TMR and TMR0 static mappings
  ...
2013-09-06 13:21:16 -07:00
Mike Dunn
1e185c7aaf pwm: pxa: Use module_platform_driver
Commit 76abbdde2d

    pwm: Add sysfs interface

causes a kernel oops due to a null pointer dereference on PXA platforms.
This happens because the class added by the patch is registered in a
subsys_initcall (initcall4), but the pxa pwm driver is registered in
arch_initcall (initcall3). If the class is not registered before the
driver probe function runs, the oops occurs in device_add() when the
uninitialized pointers in struct class are dereferenced.  I don't see a
reason that the driver must be an arch_initcall, so this patch makes it
a regular module_platform_driver (initcall6), preventing the oops.

Signed-off-by: Mike Dunn <mikedunn@newsguy.com>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Acked-by: Marek Vasut <marex@denx.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-09-03 13:09:17 +02:00
Jingoo Han
ac872bc9ed pwm: tiehrpwm: add missing __iomem annotation
Fix the following sparse warnings:

drivers/pwm/pwm-tiehrpwm.c:144:16: warning: incorrect type in argument 1 (different address spaces)
drivers/pwm/pwm-tiehrpwm.c:144:16:    expected void const volatile [noderef] <asn:2>*addr
drivers/pwm/pwm-tiehrpwm.c:144:16:    got void *
drivers/pwm/pwm-tiehrpwm.c:149:9: warning: incorrect type in argument 2 (different address spaces)
drivers/pwm/pwm-tiehrpwm.c:149:9:    expected void volatile [noderef] <asn:2>*addr
drivers/pwm/pwm-tiehrpwm.c:149:9:    got void *
drivers/pwm/pwm-tiehrpwm.c:157:18: warning: incorrect type in argument 1 (different address spaces)
drivers/pwm/pwm-tiehrpwm.c:157:18:    expected void const volatile [noderef] <asn:2>*addr
drivers/pwm/pwm-tiehrpwm.c:157:18:    got void *
drivers/pwm/pwm-tiehrpwm.c:160:9: warning: incorrect type in argument 2 (different address spaces)
drivers/pwm/pwm-tiehrpwm.c:160:9:    expected void volatile [noderef] <asn:2>*addr
drivers/pwm/pwm-tiehrpwm.c:160:9:    got void *

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-09-03 13:09:16 +02:00
Jingoo Han
3943a650f6 pwm: tiecap: add CONFIG_PM_SLEEP to ecap_pwm_{save,restore}_context()
ecap_pwm_save_context() and ecap_pwm_restore_context() are only used
when CONFIG_PM_SLEEP is selected.

drivers/pwm/pwm-tiecap.c:293:13: warning: 'ecap_pwm_save_context' defined but not used [-Wunused-function]
drivers/pwm/pwm-tiecap.c:302:13: warning: 'ecap_pwm_restore_context' defined but not used [-Wunused-function]

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-09-03 13:09:16 +02:00
Julia Lawall
88d5a2e6ff pwm: simplify use of devm_ioremap_resource
Remove unneeded error handling on the result of a call to
platform_get_resource when the value is passed to devm_ioremap_resource.

Move the call to platform_get_resource adjacent to the call to
devm_ioremap_resource to make the connection between them more clear.

A simplified version of the semantic patch that makes this change is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression pdev,res,n,e,e1;
expression ret != 0;
identifier l;
@@

- res = platform_get_resource(pdev, IORESOURCE_MEM, n);
  ... when != res
- if (res == NULL) { ... \(goto l;\|return ret;\) }
  ... when != res
+ res = platform_get_resource(pdev, IORESOURCE_MEM, n);
  e = devm_ioremap_resource(e1, res);
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-09-03 13:09:16 +02:00
Laurent Pinchart
382457e562 pwm: renesas-tpu: Add DT support
Specify DT bindings for the TPU PWM controller and add OF support to the
driver.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-09-03 13:09:15 +02:00
Laurent Pinchart
208be7698f pwm: Use the DT macro directly when parsing PWM DT flags
Don't redefine a PWM_SPEC_POLARITY macro with a value identical to
PWM_POLARITY_INVERTED, use the PWM DT macro directly.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-09-03 13:08:10 +02:00
Fabio Estevam
cfb9e4c40e pwm: mxs: Check the return value from stmp_reset_block()
stmp_reset_block() may fail, so let's check its return value and
propagate it in the case of error.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-09-03 13:07:51 +02:00
Tomasz Figa
6059235c51 pwm: Remove superseded pwm-samsung-legacy driver
This patch removes the now unused pwm-samsung-legacy driver, which was
replaced by new pwm-samsung driver.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Mark Brown <broonie@linaro.org>
Tested-by: Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Thierry Reding <thierry.reding@gmail.com>
2013-08-12 21:53:23 +02:00
Tomasz Figa
11ad39ede2 pwm: Add new pwm-samsung driver
This patch introduces new Samsung PWM driver, which is completely
rewritten to be multiplatform- and DeviceTree-aware.

In addition, remaining problems of old driver are fixed, such as:
 - proper handling of hardware variants,
 - synchronization on SMP systems,
 - handling of boundary parameter values,
 - hardware sharing with PWM clocksource driver,
 - undefined state of PWM output after stopping PWM channel.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Mark Brown <broonie@linaro.org>
Tested-by: Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Thierry Reding <thierry.reding@gmail.com>
2013-08-12 21:53:22 +02:00
Tomasz Figa
615c19e160 pwm: samsung: Rename to pwm-samsung-legacy
This patch renames the old pwm-samsung driver to pwm-samsung-legacy to
create place for the new, rewritten, DT-aware pwm-samsung driver.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Mark Brown <broonie@linaro.org>
Tested-by: Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Thierry Reding <thierry.reding@gmail.com>
2013-08-06 01:21:49 +02:00
Greg Kroah-Hartman
9da0175963 pwm: convert class code to use dev_groups
The dev_attrs field of struct class is going away soon, dev_groups
should be used instead.  This converts the PWM class code to use the
correct field.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-07-29 09:08:33 +02:00
Marek Belisko
b388f15fd1 pwm: pwm-tiehrpwm: Use clk_enable/disable instead clk_prepare/unprepare.
This was found when using pwm-led on am33xx and enable
heartbeat trigger.

[  808.624876] =================================
[  808.629443] [ INFO: inconsistent lock state ]
[  808.634021] 3.9.0  Not tainted
[  808.637415] ---------------------------------
[  808.641981] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
[  808.648288] swapper/0 [HC0[0]:SC1[1]:HE1:SE0] takes:
[  808.653494]  (prepare_lock){+.?.+.}, at: [<c027c211>] clk_unprepare+0x15/0x24
[  808.661040] {SOFTIRQ-ON-W} state was registered at:
[  808.666155]   [<c004ec4d>] __lock_acquire+0x411/0x824
[  808.671465]   [<c004f359>] lock_acquire+0x41/0x50
[  808.676412]   [<c039ee9d>] mutex_lock_nested+0x31/0x1d8
[  808.681912]   [<c027c275>] clk_prepare+0x15/0x28
[  808.686764]   [<c0590c6b>] _init+0x117/0x1e0
[  808.691256]   [<c0019ef9>] omap_hwmod_for_each+0x29/0x3c
[  808.696842]   [<c0591107>] __omap_hwmod_setup_all+0x17/0x2c
[  808.702696]   [<c0008653>] do_one_initcall+0xc3/0x10c
[  808.708017]   [<c058a627>] kernel_init_freeable+0xa7/0x134
[  808.713778]   [<c039a543>] kernel_init+0x7/0x98
[  808.718544]   [<c000cd95>] ret_from_fork+0x11/0x3c
[  808.723583] irq event stamp: 1379172
[  808.727328] hardirqs last  enabled at (1379172): [<c03a0759>] _raw_spin_unlock_irqrestore+0x21/0x30
[  808.736828] hardirqs last disabled at (1379171): [<c03a03c3>] _raw_spin_lock_irqsave+0x13/0x38
[  808.745876] softirqs last  enabled at (1379164): [<c002ae5d>] irq_enter+0x49/0x4c
[  808.753747] softirqs last disabled at (1379165): [<c002aec3>] irq_exit+0x63/0x88
[  808.761518]
[  808.761518] other info that might help us debug this:
[  808.768373]  Possible unsafe locking scenario:
[  808.768373]
[  808.774578]        CPU0
[  808.777141]        ----
[  808.779705]   lock(prepare_lock);
[  808.783186]   <Interrupt>
[  808.785929]     lock(prepare_lock);
[  808.789595]
[  808.789595]  *** DEADLOCK ***
[  808.789595]
[  808.795805] 1 lock held by swapper/0:
[  808.799643]  :  (((&heartbeat_data->timer))){+.-...}, at: [<c002e204>] call_timer_fn+0x0/0x90
[  808.808814]
[  808.808814] stack backtrace:
[  808.813402] [<c000ff19>] (unwind_backtrace+0x1/0x98) from [<c039bd75>] (print_usage_bug.part.25+0x16d/0x1cc)
[  808.823721] [<c039bd75>] (print_usage_bug.part.25+0x16d/0x1cc) from [<c004e595>] (mark_lock+0x18d/0x434)
[  808.833669] [<c004e595>] (mark_lock+0x18d/0x434) from [<c004ec1d>] (__lock_acquire+0x3e1/0x824)
[  808.842803] [<c004ec1d>] (__lock_acquire+0x3e1/0x824) from [<c004f359>] (lock_acquire+0x41/0x50)
[  808.852031] [<c004f359>] (lock_acquire+0x41/0x50) from [<c039ee9d>] (mutex_lock_nested+0x31/0x1d8)
[  808.861433] [<c039ee9d>] (mutex_lock_nested+0x31/0x1d8) from [<c027c211>] (clk_unprepare+0x15/0x24)
[  808.870930] [<c027c211>] (clk_unprepare+0x15/0x24) from [<c019f7bf>] (ehrpwm_pwm_disable+0x5f/0x80)
[  808.880431] [<c019f7bf>] (ehrpwm_pwm_disable+0x5f/0x80) from [<c019f29f>] (pwm_disable+0x27/0x28)
[  808.889751] [<c019f29f>] (pwm_disable+0x27/0x28) from [<c026f8f3>] (led_heartbeat_function+0x3f/0xb0)
[  808.899431] [<c026f8f3>] (led_heartbeat_function+0x3f/0xb0) from [<c002e249>] (call_timer_fn+0x45/0x90)
[  808.909288] [<c002e249>] (call_timer_fn+0x45/0x90) from [<c002e399>] (run_timer_softirq+0x105/0x17c)
[  808.918884] [<c002e399>] (run_timer_softirq+0x105/0x17c) from [<c002abc5>] (__do_softirq+0xa5/0x150)
[  808.928486] [<c002abc5>] (__do_softirq+0xa5/0x150) from [<c002aec3>] (irq_exit+0x63/0x88)
[  808.937098] [<c002aec3>] (irq_exit+0x63/0x88) from [<c000d599>] (handle_IRQ+0x21/0x54)
[  808.945415] [<c000d599>] (handle_IRQ+0x21/0x54) from [<c0008495>] (omap3_intc_handle_irq+0x5d/0x68)
[  808.954900] [<c0008495>] (omap3_intc_handle_irq+0x5d/0x68) from [<c000c7ff>] (__irq_svc+0x3f/0x64)
[  808.964287] Exception stack(0xc05b1f68 to 0xc05b1fb0)
[  808.969587] 1f60:                   00000001 00000001 00000000 00000000 c05b0000 c0619748
[  808.978158] 1f80: c05b0000 c05b0000 c0619748 413fc082 00000000 00000000 01000000 c05b1fb0
[  808.986719] 1fa0: c004f989 c000d6f0 400f0033 ffffffff
[  808.992024] [<c000c7ff>] (__irq_svc+0x3f/0x64) from [<c000d6f0>] (cpu_idle+0x60/0x98)
[  809.000250] [<c000d6f0>] (cpu_idle+0x60/0x98) from [<c058a535>] (start_kernel+0x1e9/0x234)

Remove non atomic clk api calls and use only atomic for enable/disable because
can be called from atomic context (led_heartbeat_function is timer callback).

Signed-off-by: Marek Belisko <marek.belisko@streamunlimited.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-06-26 23:23:54 +02:00
Axel Lin
fed1bf8dc7 pwm: pca9685: Fix wrong argument to set MODE1_SLEEP bit
Current code actually does not set MODE1_SLEEP bit because the new value for
bitmask (0x1) is wrong. To set MODE1_SLEEP bit, we should pass MODE1_SLEEP
as the new value for bitmask.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Reviewed-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-06-26 23:23:54 +02:00
Axel Lin
71077bc8db pwm: renesas-tpu: Add MODULE_ALIAS to make module auto loading work
This driver can be built as module, add MODULE_ALIAS to make module auto loading
work.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-06-26 11:48:26 +02:00
Wei Yongjun
00cf99ee00 pwm: renesas-tpu: fix return value check in tpu_probe()
In case of error, the function devm_ioremap_resource() returns ERR_PTR()
and never returns NULL. The NULL test in the return value check should
be replaced with IS_ERR().

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Reviewed-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-06-25 12:20:06 +02:00
Laurent Pinchart
99b82abb0a pwm: Add Renesas TPU PWM driver
The Timer Pulse Unit (TPU) is a 4-channels 16-bit timer used to generate
waveforms. This driver exposes PWM functions through the PWM API for
other drivers to use.

The code is loosely based on the leds-renesas-tpu driver by Magnus Damm
and the TPU PWM driver shipped in the Armadillo EVA 800 kernel sources.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Tested-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-06-21 11:33:28 +02:00
H Hartley Sweeten
76abbdde2d pwm: Add sysfs interface
Add a simple sysfs interface to the generic PWM framework.

  /sys/class/pwm/
  `-- pwmchipN/           for each PWM chip
      |-- export          (w/o) ask the kernel to export a PWM channel
      |-- npwm            (r/o) number of PWM channels in this PWM chip
      |-- pwmX/           for each exported PWM channel
      |   |-- duty_cycle  (r/w) duty cycle (in nanoseconds)
      |   |-- enable      (r/w) enable/disable PWM
      |   |-- period      (r/w) period (in nanoseconds)
      |   `-- polarity    (r/w) polarity of PWM (normal/inversed)
      `-- unexport        (w/o) return a PWM channel to the kernel

Based on work by Lars Poeschel.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Lars Poeschel <poeschel@lemonage.de>
Cc: Ryan Mallon <rmallon@gmail.com>
Cc: Rob Landley <rob@landley.net>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-06-21 11:32:51 +02:00
Thierry Reding
3dd0a90947 pwm: Fill in missing .owner fields
Some drivers don't set the .owner fields of the struct device_driver or
struct pwm_ops, which causes the module usage count to become wrong.

Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-06-12 13:18:29 +02:00
Steffen Trumtrar
88b613e623 pwm: add pca9685 driver
Add pwm driver for the NXP pca9685 16 channel pwm-led controller.

The driver is really barebones at this stage. E.g. the OE' pin and
therefore the corresponding registers are not supported.
The driver was tested on a HW where this pin is tied to GND.

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
[thierry.reding@gmail.com: style and whitespace cleanups]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-06-12 13:13:18 +02:00
Boris BREZILLON
8796f9c565 pwm: atmel-tcb: prepare clk before calling enable
Replace clk_enable/disable with clk_prepare_enable/disable_unprepare to
avoid common clk framework warnings.

Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-06-12 12:51:44 +02:00
Wolfram Sang
77f0b9d2ff pwm: devm: alloc correct pointer size
The allocated object should be the size of what the pointer is pointing
to and not the size of the pointer itself.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-06-10 12:50:10 +02:00
Fabio Estevam
e7927141ed pwm: mxs: Let device core handle pinctrl
Since commit ab78029 (drivers/pinctrl: grab default handles from device core),
we can rely on device core for handling pinctrl.

So remove devm_pinctrl_get_select_default() from the driver.

Cc: Thierry Reding <thierry.reding@avionic-design.de>
Cc: <linux-kernel@vger.kernel.org>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-05-27 17:48:33 +02:00
Wolfram Sang
362e9cd2f5 drivers/pwm: don't check resource with devm_ioremap_resource
devm_ioremap_resource does sanity checks on the given resource. No need to
duplicate this in the driver.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Stephen Warren <swarren@nvidia.com>
2013-05-18 11:55:58 +02:00
Axel Lin
affb923df9 pwm: lpc32xx: Don't change PWM_ENABLE bit in lpc32xx_pwm_config
lpc32xx_pwm_config() is supposed to set duty_ns and period_ns,
it should not change PWM_ENABLE bit.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Tested-by: Roland Stigge <stigge@antcom.de>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-04-23 10:58:47 +02:00
Axel Lin
08ee77b5a5 pwm: lpc32xx: Properly set PWM_ENABLE bit in lpc32xx_pwm_[enable|disable]
According to the LPC32x0 User Manual [1]:

For both PWM1 and PWM2 Control Registers:
BIT 31:
This bit gates the PWM_CLK signal and enables the external output pin
to the PWM_PIN_STATE logical level.

0 = PWM disabled. (Default)
1 = PWM enabled

So in lpc32xx_pwm_enable(), we should set PWM_ENABLE bit.
In lpc32xx_pwm_disable(), we should just clear PWM_ENABLE bit rather than
write 0 to the register which will also clear PWMx_RELOADV and PWMx_DUTY bits.

[1] http://www.nxp.com/documents/user_manual/UM10326.pdf

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Tested-by: Roland Stigge <stigge@antcom.de>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-04-23 10:58:35 +02:00
Thierry Reding
f1a8870aeb pwm: Constify OF match tables
A few drivers already annotate this properly. Make the same change for
all other OF supporting drivers.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Alexandre Pereira da Silva <aletes.xgr@gmail.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
2013-04-23 07:42:20 +02:00
Axel Lin
a46ef4d572 pwm: puv3: Remove unused enabled filed from struct puv3_pwm_chip
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-04-02 11:40:18 +02:00
Axel Lin
22976a5dad pwm: pxa: Remove PWM_ID_BASE macro
PWM_ID_BASE() is not used after convert to PWM framework, remove it.
Also update driver_data field of struct platform_device_id accordingly.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Eric Miao <eric.y.miao@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-04-02 11:40:17 +02:00
Axel Lin
b3fef7f100 pwm: spear: Remove unused *dev from struct spear_pwm_chip
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Shiraz Hashim <shiraz.hashim@st.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-04-02 11:40:00 +02:00
Axel Lin
4e61573df8 pwm: mxs: Remove unused *dev from struct mxs_pwm_chip
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-04-02 11:33:05 +02:00
Axel Lin
c8e4df3109 pwm: twl: Return proper error if twl6030_pwm_enable() fails
Return proper error instead of 0 if twl6030_pwm_enable() fails.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-04-02 11:32:14 +02:00
Axel Lin
b014a30c59 pwm: pxa: Remove clk_enabled field from struct pxa_pwm_chip
clk_enable/clk_disable maintain an enable_count, clk_prepare and clk_unprepare
also maintain a prepare_count. These APIs will do prepare/enable when the first
user calling these APIs, and do disable/unprepare when the corresponding counter
reach 0. Thus We don't need to maintain a clk_enabled counter here.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Eric Miao <eric.y.miao@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-04-02 11:31:37 +02:00
Axel Lin
72da70e77f pwm: imx: Remove enabled field from struct imx_chip
We can test PWMF_ENABLED bit to know if pwm is enabled or not.
Thus remove enabled field from struct imx_chip.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-04-02 11:30:57 +02:00
Axel Lin
d5714e8b9d pwm: twl: Add .owner to struct pwm_ops
Add missing .owner of struct pwm_ops. This prevents the module from being
removed from underneath its users.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-04-02 11:30:18 +02:00
Axel Lin
7fa25314d5 pwm: twl-led: Add .owner to struct pwm_ops
Add missing .owner of struct pwm_ops. This prevents the module from being
removed from underneath its users.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-04-02 11:29:57 +02:00
Axel Lin
83c80dc535 pwm: atmel-tcb: Add .owner to struct pwm_ops
Add missing .owner of struct pwm_ops. This prevents the module from being
removed from underneath its users.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-04-02 11:29:22 +02:00
Axel Lin
fa0abee9b8 pwm: ab8500: Add .owner to struct pwm_ops
Add missing .owner of struct pwm_ops. This prevents the module from being
removed from underneath its users.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-04-02 11:29:11 +02:00
Axel Lin
563861cd63 pwm: spear: Fix checking return value of clk_enable() and clk_prepare()
The logic to check return value of clk_enable() and clk_prepare() is reversed,
fix it.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Cc: stable@vger.kernel.org
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-04-02 11:28:36 +02:00
Axel Lin
b343a1887e pwm: tiehrpwm: Staticize non-exported symbols
Both ehrpwm_pwm_save_context() and ehrpwm_pwm_restore_context() are only used in
this file, make them static.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-03-26 16:04:03 +01:00
Axel Lin
a38c989857 pwm: tiecap: Staticize non-exported symbols
Both ecap_pwm_save_context() and ecap_pwm_restore_context() are only used in
this file, make them static.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-03-26 16:04:03 +01:00
Axel Lin
622fc5d445 pwm: ab8500: Fix trivial typo in dev_err message
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-03-26 16:04:03 +01:00
Philip Avinash
1bf0f20bcc pwm: davinci: Add Kconfig support for ECAP & EHRPWM devices
Add EHRPWM and ECAP support build support for DAVINCI_DA8XX platforms.

Also, since DAVINCI platforms doesn't support TI-PWM-Subsystem module,
remove the select option for CONFIG_PWM_TIPWMSS.

Also, update CONFIG_PWM_TIPWMSS compiler directive appropriately in
pwm-tipwmss.h to fix the below compiler error upon removal of
CONFIG_PWM_TIPWMSS for DAVINCI platforms.

	drivers/pwm/pwm-tiecap.c: In function 'ecap_pwm_probe':
	drivers/pwm/pwm-tiecap.c:263:4: error: 'PWMSS_ECAPCLK_EN' undeclared
	(first use in this function)
	drivers/pwm/pwm-tiecap.c:263:4: note: each undeclared identifier
	is reported only once for each function it appears in
	drivers/pwm/pwm-tiecap.c:264:17: error: 'PWMSS_ECAPCLK_EN_ACK'
	undeclared (first use in this function)
	drivers/pwm/pwm-tiecap.c: In function 'ecap_pwm_remove':
	drivers/pwm/pwm-tiecap.c:291:49: error: 'PWMSS_ECAPCLK_STOP_REQ'
	undeclared (first use in this function)
	make[2]: *** [drivers/pwm/pwm-tiecap.o] Error 1
	make[1]: *** [drivers/pwm] Error 2
	make: *** [drivers] Error 2

Signed-off-by: Philip Avinash <avinashphilip@ti.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-03-22 11:35:20 +01:00
Jingoo Han
29258b215a pwm: pwm-tiehrpwm: add CONFIG_PM_SLEEP to suspend/resume functions
This patch adds CONFIG_PM_SLEEP to suspend/resume functions to fix
the following build warning when CONFIG_PM_SLEEP is not selected.

drivers/pwm/pwm-tiehrpwm.c:562:12: warning: 'ehrpwm_pwm_suspend' defined but not used [-Wunused-function]
drivers/pwm/pwm-tiehrpwm.c:580:12: warning: 'ehrpwm_pwm_resume' defined but not used [-Wunused-function

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-03-11 08:28:22 +01:00
Jingoo Han
c26e9bb4ac pwm: pwm-tipwmss: add CONFIG_PM_SLEEP to suspend/resume functions
This patch adds CONFIG_PM_SLEEP to suspend/resume functions to fix
the following build warning when CONFIG_PM_SLEEP is not selected.

drivers/pwm/pwm-tipwmss.c:104:12: warning: 'pwmss_suspend' defined but not used [-Wunused-function]
drivers/pwm/pwm-tipwmss.c:113:12: warning: 'pwmss_resume' defined but not used [-Wunused-function]

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-03-11 08:28:22 +01:00
Jingoo Han
b78f5fc92a pwm: pwm-tiecap: add CONFIG_PM_SLEEP to suspend/resume functions
This patch adds CONFIG_PM_SLEEP to suspend/resume functions to fix
the following build warning when CONFIG_PM_SLEEP is not selected.

drivers/pwm/pwm-tiecap.c:314:12: warning: 'ecap_pwm_suspend' defined but not used [-Wunused-function]
drivers/pwm/pwm-tiecap.c:328:12: warning: 'ecap_pwm_resume' defined but not used [-Wunused-function]

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-03-11 08:28:22 +01:00
Jingoo Han
c509a8e521 pwm: samsung: convert s3c_pwm to dev_pm_ops
Instead of using legacy suspend/resume methods, using newer dev_pm_ops
structure allows better control over power management.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-03-08 08:30:55 +01:00
Jingoo Han
482467ad97 pwm: ab8500: use devm_kzalloc()
Use devm_kzalloc() to make cleanup paths more simple.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-03-08 08:30:50 +01:00
Linus Torvalds
3eb05225ee pwm: Changes for v3.9-rc1
A new driver has been added to support the PWM mode of the timer counter
 blocks found on Atmel AT91 SoCs. The VT8500 driver now supports changing
 the PWM signal polarity and the TI drivers (EHRPWM and ECAP) gained
 suspend and resume functionality.
 
 User drivers can now query the core for whether access to a PWM device
 will sleep (if the PWM chip is on a slow bus such as I2C or SPI).
 
 The pwm-backlight driver now handles the backlight BL_CORE_FBBLANK state
 in addition to the FB layer's blanking states.
 
 To round things off, a few fixes and cleanups are also included.
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Merge tag 'for-3.9-rc1' of git://gitorious.org/linux-pwm/linux-pwm

Pull PWM changes from Thierry Reding:
 "A new driver has been added to support the PWM mode of the timer
  counter blocks found on Atmel AT91 SoCs.  The VT8500 driver now
  supports changing the PWM signal polarity and the TI drivers (EHRPWM
  and ECAP) gained suspend and resume functionality.

  User drivers can now query the core for whether access to a PWM device
  will sleep (if the PWM chip is on a slow bus such as I2C or SPI).

  The pwm-backlight driver now handles the backlight BL_CORE_FBBLANK
  state in addition to the FB layer's blanking states.

  To round things off, a few fixes and cleanups are also included"

* tag 'for-3.9-rc1' of git://gitorious.org/linux-pwm/linux-pwm:
  pwm: twl: Use to_twl() instead of container_of()
  pwm: tegra: assume CONFIG_OF
  pwm_backlight: Validate dft_brightness in main probe function
  pwm: Export pwm_{set,get}_chip_data()
  pwm: Make Kconfig entries more consistent
  pwm: Add can_sleep property to drivers
  pwm: Add pwm_can_sleep() as exported API to users
  pwm-backlight: handle BL_CORE_FBBLANK state
  pwm: pwm-tiecap: Low power sleep support
  pwm: pwm-tiehrpwm: Low power sleep support
  pwm: pwm-tiehrpwm: Update the clock handling of pwm-tiehrpwm driver
  pwm: vt8500: Add polarity support
  pwm: vt8500: Register write busy test performed incorrectly
  pwm: atmel: add Timer Counter Block PWM driver
2013-02-26 09:34:29 -08:00
Linus Torvalds
0512c04a2b Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds
Pull LED subsystem update from Bryan Wu.

* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds: (61 commits)
  leds: leds-sunfire: use dev_err()/pr_err() instead of printk()
  leds: 88pm860x: Add missing of_node_put()
  leds: tca6507: Use of_get_child_count()
  leds: leds-pwm: make it depend on PWM and not HAVE_PWM
  Documentation: leds: update LP55xx family devices
  leds-lp55xx: fix problem on removing LED attributes
  leds-lp5521/5523: add author and copyright description
  leds-lp5521/5523: use new lp55xx common header
  leds-lp55xx: clean up headers
  leds-lp55xx: clean up definitions
  leds-lp55xx: clean up unused data and functions
  leds-lp55xx: clean up _remove()
  leds-lp55xx: add new function for removing device attribtues
  leds-lp55xx: code refactoring on selftest function
  leds-lp55xx: use common device attribute driver function
  leds-lp55xx: support device specific attributes
  leds-lp5523: use generic firmware interface
  leds-lp5521: use generic firmware interface
  leds-lp55xx: support firmware interface
  leds-lp55xx: add new lp55xx_register_sysfs() for the firmware interface
  ...
2013-02-26 09:29:02 -08:00
Johannes Thumshirn
30f7861703 pwm: twl: Use to_twl() instead of container_of()
Always use to_twl() for converting into private data instead of
container_of().

Signed-off-by: Johannes Thumshirn <morbidrsa@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-02-17 11:27:07 +01:00
Stephen Warren
838bf09d4f pwm: tegra: assume CONFIG_OF
Tegra only supports, and always enables, device tree. Remove all ifdefs
for DT support from the driver.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-02-15 23:27:51 +01:00
Peter Ujfalusi
261a5edd3a pwm: Add devm_of_pwm_get() as exported API for users
When booted with DT users can use devm version of of_pwm_get() to benefit
from automatic resource release.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
2013-02-01 17:47:05 -08:00
Peter Ujfalusi
8eb9612799 pwm: core: Rename of_pwm_request() to of_pwm_get() and export it
Allow client driver to use of_pwm_get() to get the PWM they need. This
is needed for drivers which handle more than one PWM separately, like
leds-pwm driver, which have:

pwmleds {
	compatible = "pwm-leds";
	kpad {
		label = "omap4::keypad";
		pwms = <&twl_pwm 0 7812500>;
		max-brightness = <127>;
	};

	charging {
		label = "omap4:green:chrg";
		pwms = <&twl_pwmled 0 7812500>;
		max-brightness = <255>;
	};
};

in the dts files.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
2013-02-01 17:47:05 -08:00
Thierry Reding
928c44775b pwm: Export pwm_{set,get}_chip_data()
When building a driver as a module, these functions need to be exported
for linking to succeed.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-01-30 09:22:24 +01:00
Thierry Reding
b133d2a137 pwm: Make Kconfig entries more consistent
PWM is now consistently spelled in all uppercase letters. For the Atmel
driver the entry now also mentions Atmel to make it easier to find.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-01-30 09:21:35 +01:00
Florian Vaussard
2e2a0f6ed1 pwm: Add can_sleep property to drivers
Calls to PWM drivers connected through I2C can sleep.
Use the new can_sleep property.

Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Florian Vaussard <florian.vaussard@epfl.ch>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-01-30 09:12:51 +01:00
Florian Vaussard
6e69ab1361 pwm: Add pwm_can_sleep() as exported API to users
Calls to some external PWM chips can sleep. To help users,
add pwm_can_sleep() API.

Cc: Thierry Reding <thierry.reding@avionic-design.de>
Cc: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Florian Vaussard <florian.vaussard@epfl.ch>
Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-01-30 09:12:18 +01:00
Thierry Reding
6d4294d163 pwm: Convert to devm_ioremap_resource()
Convert all uses of devm_request_and_ioremap() to the newly introduced
devm_ioremap_resource() which provides more consistent error handling.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-22 11:41:57 -08:00
Philip Avinash
0d75c203ef pwm: pwm-tiecap: Low power sleep support
In low power modes of AM33XX platforms, peripherals power is cut off.
This patch supports low power sleep transition support for ECAP driver.

Signed-off-by: Philip Avinash <avinashphilip@ti.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-01-17 16:52:59 +01:00
Philip Avinash
0e2feb17de pwm: pwm-tiehrpwm: Low power sleep support
In low power modes of AM33XX platforms, peripherals power is cut off.
This patch supports low power sleep transition support for EHRPWM
driver.

Signed-off-by: Philip Avinash <avinashphilip@ti.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-01-17 16:52:58 +01:00
Philip, Avinash
0074b49b3f pwm: pwm-tiehrpwm: Update the clock handling of pwm-tiehrpwm driver
The clock framework has changed and it's now better to invoke
clock_prepare_enable() and clk_disable_unprepare() rather than the
legacy clk_enable() and clk_disable() calls. This patch converts the
pwm-tiehrpwm driver to the new framework.

Signed-off-by: Philip Avinash <avinashphilip@ti.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-01-14 08:12:27 +01:00
Tony Prisk
3ccb1c1702 pwm: vt8500: Add polarity support
Add support to set polarity on PWM devices, allowing for inverted
duty cycles.

Also update the binding document to #pwm-cells = <3> to allow
passing the flags from devicetree.

Signed-off-by: Tony Prisk <linux@prisktech.co.nz>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-01-09 08:17:12 +01:00
Tony Prisk
8ab432caa4 pwm: vt8500: Register write busy test performed incorrectly
Correct operation for register writes is to perform a busy-wait
after writing the register. Currently the busy wait it performed
before, meaning subsequent register writes to bitfields may occur
before the previous field has been updated.

Also, all registers are defined as 32-bit read/write. Change
pwm_busy_wait() to use readl rather than readb.

Improve readability of code with defines for registers and bitfields.

Signed-off-by: Tony Prisk <linux@prisktech.co.nz>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-01-09 08:17:04 +01:00
Boris BREZILLON
9421bade07 pwm: atmel: add Timer Counter Block PWM driver
This patch adds a PWM driver based on Atmel Timer Counter Block. The
Timer Counter Block is used in Waveform generator mode.

A Timer Counter Block provides up to 6 PWM devices grouped by 2:
* group 0 = PWM 0 and 1
* group 1 = PWM 2 and 3
* group 2 = PMW 4 and 5

PWM devices in a given group must be configured with the same period
value. If a PWM device in a group tries to change the period value and
the other device is already configured with a different value an error
will be returned.

This driver requires device tree support. The Timer Counter Block number
used to create a PWM chip is given by the tc-block field in an
"atmel,tcb-pwm" compatible node.

This patch was tested on kizbox board (at91sam9g20 SoC) with pwm-leds.

Signed-off-by: Boris BREZILLON <linux-arm@overkiz.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-01-08 16:52:10 +01:00
Linus Torvalds
74779e2226 pwm: Changes for v3.8-rc1
A new driver has been added for the SPEAr platform and the TWL4030/6030
 driver has been replaced by two drivers that control the regular PWMs
 and the PWM driven LEDs provided by the chips.
 
 The vt8500, tiecap, tiehrpwm, i.MX, LPC32xx and Samsung drivers have all
 been improved and the device tree bindings now support the PWM signal
 polarity.
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Merge tag 'for-3.8-rc1' of git://gitorious.org/linux-pwm/linux-pwm

Pull pwm changes from Thierry Reding:
 "A new driver has been added for the SPEAr platform and the
  TWL4030/6030 driver has been replaced by two drivers that control the
  regular PWMs and the PWM driven LEDs provided by the chips.

  The vt8500, tiecap, tiehrpwm, i.MX, LPC32xx and Samsung drivers have
  all been improved and the device tree bindings now support the PWM
  signal polarity."

Fix up trivial conflicts due to __devinit/exit removal.

* tag 'for-3.8-rc1' of git://gitorious.org/linux-pwm/linux-pwm: (21 commits)
  pwm: samsung: add missing s3c->pwm_id assignment
  pwm: lpc32xx: Set the chip base for dynamic allocation
  pwm: lpc32xx: Properly disable the clock on device removal
  pwm: lpc32xx: Fix the PWM polarity
  pwm: i.MX: eliminate build warning
  pwm: Export of_pwm_xlate_with_flags()
  pwm: Remove pwm-twl6030 driver
  pwm: New driver to support PWM driven LEDs on TWL4030/6030 series of PMICs
  pwm: New driver to support PWMs on TWL4030/6030 series of PMICs
  pwm: pwm-tiehrpwm: pinctrl support
  pwm: tiehrpwm: Add device-tree binding
  pwm: pwm-tiehrpwm: Adding TBCLK gating support.
  pwm: pwm-tiecap: pinctrl support
  pwm: tiecap: Add device-tree binding
  pwm: Add TI PWM subsystem driver
  pwm: Device tree support for PWM polarity
  pwm: vt8500: Ensure PWM clock is enabled during pwm_config
  pwm: vt8500: Fix build error
  pwm: spear: Staticize spear_pwm_config()
  pwm: Add SPEAr PWM chip driver support
  ...
2012-12-19 08:19:07 -08:00
Joonyoung Shim
20e8ac3eea pwm: samsung: add missing s3c->pwm_id assignment
The s3c->pwm_id is used to calculate offset of related register.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2012-12-14 08:32:58 +01:00
Alban Bedel
8fc6d09dcb pwm: lpc32xx: Set the chip base for dynamic allocation
Doing so allows the base to be allocated dynamically at runtime and
makes it easier for the chip to coexist with other PWM chips.

Signed-off-by: Alban Bedel <alban.bedel@avionic-design.de>
Acked-by: Alexandre Pereira da Silva <aletes.xgr@gmail.com>
Acked-by: Roland Stigge <stigge@antcom.de>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2012-12-06 08:52:13 +01:00
Alban Bedel
54b2a999a1 pwm: lpc32xx: Properly disable the clock on device removal
A single clock is used for all PWMs meaning the clock's reference count
might be between 0 and N when .remove() is called. Instead of a single
clk_disable() call pwm_disable() on each PWM, to ensure that
clk_disable() is called for each PWM that is still enabled.

Signed-off-by: Alban Bedel <alban.bedel@avionic-design.de>
Acked-by: Alexandre Pereira da Silva <aletes.xgr@gmail.com>
Acked-by: Roland Stigge <stigge@antcom.de>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2012-12-06 08:52:11 +01:00