At least earlycon needs a delayed idle before the 8250 driver probes
to avoid glitches in the console output. Let's handle the delayed idle
for devices tagged with ti,no-reset-on-init and ti,no-idle-on-init with
delayed_work. Others don't need it, and there should be no need to use
runtime PM autosuspend for the interconnect target driver as it's the
child device drivers that should configure it.
Signed-off-by: Tony Lindgren <tony@atomide.com>
If we have stdout-path specified for earlycon, we must prevent
the debug console from idling until runtime PM kicks in.
Signed-off-by: Tony Lindgren <tony@atomide.com>
The functional clock is used by several child device drivers to query
the rate for the child device internal configuration. The functional
clock is really for the whole interconnect target module, and not just
for the child device, and can also be shared across multiple children.
At least the timers, i2c and mmc driver query the fck for rate.
So let's just create a clock alias for the child fck if it does not
yet exits. We can do this with the BUS_NOTIFY_ADD_DEVICE before the
child is probed.
Note that we need to now also remove the legacy mode check for getting
the dts clocks in ti-sysc driver.
Signed-off-by: Tony Lindgren <tony@atomide.com>
We are currently only checking for the first entry in the table while
we should check them all. Usual no-idle-on-init is together with
no-reset-on-init, so this has gone unnoticed.
Fixes: 566a9b05e1 ("bus: ti-sysc: Handle module quirks based dts
configuration")
Signed-off-by: Tony Lindgren <tony@atomide.com>
The enawakeup bit is in a different location for smartreflex compared
to the "ti,sysc-omap2" compatible.
Fixes: 70a65240ef ("bus: ti-sysc: Add register bits for interconnect
target modules")
Signed-off-by: Tony Lindgren <tony@atomide.com>
We need to configure the interconnect target module based on the
device three configuration.
Let's also add a new quirk for SYSC_QUIRK_RESET_STATUS to indicate
that the SYSCONFIG reset bit changes after the reset is done.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Let's configure few module quirks via device tree using the
properties for "ti,no-idle-on-init", "ti,no-reset-on-init"
and "ti,sysc-delay-us".
Let's also reorder the probe a bit so we have pdata available
earlier, and move the PM runtime calls to sysc_init_module()
from sysc_read_revision().
Signed-off-by: Tony Lindgren <tony@atomide.com>
We can easily detect i2c based on it's non-standard module registers that
consist of two 32-bit registers accessed in 16-bit mode.
So far we don't have other 16-bit modules, so there's currently no need
to add a custom property for 16-bit register access.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Let's add data for the known interconnect target module types by mapping
their register bits.
Note that we can handle many quirks for the older omap2 type1 modules
directly in the driver without a need for adding custom properties.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Looks like we're missing remove() that's needed if a driver instance
rebound. Otherwise we will get "Unbalanced pm_runtime_enable!".
Signed-off-by: Tony Lindgren <tony@atomide.com>
The new bus driver causes a harmless compile-time warning when
CONFIG_PM is disabled:
drivers/bus/ti-sysc.c:440:12: error: 'sysc_runtime_resume' defined but not used [-Werror=unused-function]
static int sysc_runtime_resume(struct device *dev)
^~~~~~~~~~~~~~~~~~~
drivers/bus/ti-sysc.c:421:12: error: 'sysc_runtime_suspend' defined but not used [-Werror=unused-function]
static int sysc_runtime_suspend(struct device *dev)
^~~~~~~~~~~~~~~~~~~~
This marks the two unused functions as __maybe_unused to shut up
that warning.
Fixes: 0eecc636e5 ("bus: ti-sysc: Add minimal TI sysc interconnect target driver")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Tony Lindgren <tony@atomide.com>
We can handle the sysc interconnect target module in a generic way
for many TI SoCs. Initially let's just enable runtime PM with
autosuspend, and probe the children. This can already be used for
idling interconnect target modules that don't have any device driver
available for the child devices.
For now, the "ti,hwmods" custom binding is still required. That will
be eventually deprecated in later patches. And more features will be
added, such as parsing for sysc capabilities so we can continue
removing the legacy platform data.
Cc: Benoît Cousson <bcousson@baylibre.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Nishanth Menon <nm@ti.com>
Cc: Matthijs van Duin <matthijsvanduin@gmail.com>
Cc: Paul Walmsley <paul@pwsan.com>
Cc: Peter Ujfalusi <peter.ujfalusi@ti.com>
Cc: Sakari Ailus <sakari.ailus@iki.fi>
Cc: Tero Kristo <t-kristo@ti.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Tony Lindgren <tony@atomide.com>
