AuxXxilium/linux_dsm_epyc7002
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82ee620dc6
linux_dsm_epyc7002/arch/arm
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Paul Walmsley 82ee620dc6 ARM: OMAP: AM35xx: fix UART4 softreset 
During kernel init, the AM3505/AM3517 UART4 cannot complete its softreset:

omap_hwmod: uart4: softreset failed (waited 10000 usec)

This also results in another warning later in the boot process:

omap_hwmod: uart4: enabled state can only be entered from initialized, idle, or disabled state

From empirical observation, the AM35xx UART4 IP block requires either
uart1_fck or uart2_fck to be enabled while UART4 resets.  Otherwise
the reset will never complete.  So this patch adds uart1_fck as an
optional clock for UART4 and adds the appropriate hwmod flag to cause
uart1_fck to be enabled during the reset process.  (The choice of
uart1_fck over uart2_fck was arbitrary.)

Unfortunately this observation raises many questions.  Is it necessary
for uart1_fck or uart2_fck to be controlled with uart4_fck for the
UART4 to work correctly?  What exactly do the AM35xx UART4 clock
tree and the related PRCM idle management FSMs look like?  If anyone
has the ability to answer these questions through empirical functional
testing, or hardware information from the AM35xx designers, it would
be greatly appreciated.

Cc: Benoît Cousson <b-cousson@ti.com>
Cc: Kyle Manna <kyle.manna@fuel7.com>
Cc: Mark A. Greer <mgreer@animalcreek.com>
Cc: Ranjith Lohithakshan <ranjithl@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Tested-by: Mark A. Greer <mgreer@animalcreek.com>
2012-06-27 14:53:46 -06:00
..
boot ARM: SoC fixes 2012-06-24 10:57:59 -07:00
common ARM: dma-mapping: fix debug messages in dmabounce code 2012-06-13 14:25:16 +02:00
configs ARM: ux500: Provide regulator support for SMSC911x via Device Tree 2012-06-01 02:04:46 +02:00
include/asm Merge branch 'akpm' (Andrew's patch-bomb) 2012-06-20 14:41:57 -07:00
kernel ARM: 7425/1: extable: ensure fixup entries are 4-byte aligned 2012-06-16 16:30:25 +01:00
lib ARM: Remove support for ARMv3 ARM610 and ARM710 CPUs 2012-05-05 05:50:50 +01:00
mach-at91 Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma 2012-05-25 09:31:59 -07:00
mach-bcmring ARM: bcmring: fix UART declarations 2012-04-18 21:21:45 -07:00
mach-clps711x ARM: clps711x: Cleanup IRQ handling 2012-05-15 21:20:59 +02:00
mach-cns3xxx ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
mach-davinci arm-soc: sweeping late_initcall cleanup 2012-05-26 13:14:01 -07:00
mach-dove arm-soc: clock driver changes 2012-05-26 12:42:29 -07:00
mach-ebsa110
mach-ep93xx - More robust parsing especially of xattr data in JFFS2 2012-06-01 16:55:42 -07:00
mach-exynos fbdev updates for 3.5 2012-06-01 16:57:51 -07:00
mach-footbridge ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
mach-gemini
mach-h720x
mach-highbank ARM: highbank: Add smc calls to enable/disable the L2 2012-06-07 22:39:43 -07:00
mach-imx Merge branch 'imx/fixes' of git://git.pengutronix.de/git/imx/linux-2.6 into fixes 2012-06-07 14:59:28 -07:00
mach-integrator Merge branches 'amba', 'devel-stable', 'fixes', 'mach-types', 'mmci', 'pci' and 'versatile' into for-linus 2012-05-21 15:15:10 +01:00
mach-iop13xx ARM: PCI: get rid of pci_std_swizzle() 2012-05-13 17:12:16 +01:00
mach-iop32x ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
mach-iop33x ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
mach-ixp4xx - More robust parsing especially of xattr data in JFFS2 2012-06-01 16:55:42 -07:00
mach-kirkwood ARM: Orion: Fix Virtual/Physical mixup with watchdog 2012-06-23 16:19:21 -07:00
mach-ks8695 ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
mach-l7200/include/mach
mach-lpc32xx GPIO driver changes for v3.5 merge window 2012-05-24 14:01:46 -07:00
mach-mmp ARM: mmp: fix missing cascade_irq in irq handler 2012-06-05 17:42:23 +08:00
mach-msm arm-soc: sweeping late_initcall cleanup 2012-05-26 13:14:01 -07:00
mach-mv78xx0 arm-soc: clock driver changes 2012-05-26 12:42:29 -07:00
mach-mxs arm-soc: device tree conversions, part 2 2012-05-26 12:57:47 -07:00
mach-netx
mach-nomadik - More robust parsing especially of xattr data in JFFS2 2012-06-01 16:55:42 -07:00
mach-omap1 - More robust parsing especially of xattr data in JFFS2 2012-06-01 16:55:42 -07:00
mach-omap2 ARM: OMAP: AM35xx: fix UART4 softreset 2012-06-27 14:53:46 -06:00
mach-orion5x ARM: Orion: Fix Virtual/Physical mixup with watchdog 2012-06-23 16:19:21 -07:00
mach-picoxcell
mach-pnx4008 arm-soc: sweeping late_initcall cleanup 2012-05-26 13:14:01 -07:00
mach-prima2 arm-soc: sweeping late_initcall cleanup 2012-05-26 13:14:01 -07:00
mach-pxa - More robust parsing especially of xattr data in JFFS2 2012-06-01 16:55:42 -07:00
mach-realview
mach-rpc
mach-s3c24xx fbdev updates for 3.5 2012-06-01 16:57:51 -07:00
mach-s3c64xx fbdev updates for 3.5 2012-06-01 16:57:51 -07:00
mach-s3c2410
mach-s3c2412
mach-s3c2440
mach-s5p64x0 fbdev updates for 3.5 2012-06-01 16:57:51 -07:00
mach-s5pc100 fbdev updates for 3.5 2012-06-01 16:57:51 -07:00
mach-s5pv210 fbdev updates for 3.5 2012-06-01 16:57:51 -07:00
mach-sa1100 Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2012-05-29 18:21:44 -07:00
mach-shark ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
mach-shmobile Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-06-04 11:25:31 -07:00
mach-spear3xx Viresh has moved 2012-06-20 14:39:36 -07:00
mach-spear6xx Viresh has moved 2012-06-20 14:39:36 -07:00
mach-spear13xx Viresh has moved 2012-06-20 14:39:36 -07:00
mach-tegra ARM: tegra: make tegra_cpu_reset_handler_enable() __init 2012-06-18 16:42:57 -07:00
mach-u300 ARM: u300: bump all IRQ numbers by one 2012-04-20 09:52:58 +02:00
mach-ux500 serial/amba-pl011: move custom pin control to driver 2012-06-12 15:41:44 -07:00
mach-versatile arm: versatile: fix and enable PCI I/O space 2012-06-16 18:41:35 -07:00
mach-vexpress Merge branch 'late/soc' into devel-late 2012-05-30 16:06:46 -07:00
mach-vt8500
mach-w90x900
mach-zynq
mm ARM: mm: fix type of the arm_dma_limit global variable 2012-06-11 14:30:47 +02:00
net ARM: 7421/1: bpf_jit: BPF_S_ANC_ALU_XOR_X support 2012-06-14 15:12:13 +01:00
nwfpe
oprofile
plat-iop ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
plat-mxc Some fixes for the fresh i.MX common clock support 2012-06-07 11:47:28 -07:00
plat-nomadik ARM: nomadik: enable PINCTRL_NOMADIK where needed 2012-05-15 14:42:57 +02:00
plat-omap Some uncontroversial OMAP clock, hwmod, and compiler warning fixes for 3.5-rc 2012-06-23 16:16:29 -07:00
plat-orion ARM: Orion: Fix Virtual/Physical mixup with watchdog 2012-06-23 16:19:21 -07:00
plat-pxa ARM: MMP: add pxa910-ssp into ssp_id_table 2012-06-11 12:25:50 +08:00
plat-s3c24xx ARM: S3C24XX: move common clock init into common.c 2012-05-12 16:22:18 +09:00
plat-samsung fbdev updates for 3.5 2012-06-01 16:57:51 -07:00
plat-spear Viresh has moved 2012-06-20 14:39:36 -07:00
plat-versatile ARM: 7389/2: plat-versatile: modernize FPGA IRQ controller 2012-05-04 16:53:37 +01:00
tools ARM: Update mach-types 2012-04-26 08:46:02 +01:00
vfp Merge branch 'misc' into for-linus 2012-05-21 15:15:24 +01:00
Kconfig ARM: Orion5x - Restore parts of io.h, with rework 2012-06-23 16:18:17 -07:00
Kconfig-nommu
Kconfig.debug arm-soc: device tree conversions, part 2 2012-05-26 12:57:47 -07:00
Makefile arm-soc: soc specific changes, part 2 2012-05-26 13:05:55 -07:00