Some drivers need to switch pin states between GPIO and pin function at
runtime, which was inadvertently broken in the pinctrl driver for GPIOs
being bound to a specific direction.
This fixes up the request path to ensure that previously configured GPIOs
don't cause us to inadvertently error out with an unsupported mux on
reconfig, which in practice is primarily aimed at trapping pull-up/down
users that have yet to be implemented under the new API.
Fixes up regressions in the TPU PWM driver, amongst others.
Reported-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
The sh_pfc_gpio_request_enable() function acquires a spinlock but fails
to release it before returning if the requested mux type is not
supported. Fix this.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Commit ca5481c68e ("sh: pfc: Rudimentary
pinctrl-backed GPIO support.") introduced a regression for platforms that
were doing early GPIO API calls (from arch_initcall() or earlier),
leading to a situation where our two-stage registration logic would trip
itself up and we'd -ENODEV out of the pinctrl registration path,
resulting in endless -EPROBE_DEFER errors. Further lack of checking any
sort of errors from gpio_request() resulted in boot time warnings,
tripping on the FLAG_REQUESTED test-and-set in gpio_ensure_requested().
As it turns out there's no particular need to bother with the two-stage
registration, as the platform bus is already available at the point that
we have to start caring. As such, it's easiest to simply fold these
together in to a single init path, the ordering of which is ensured
through the platform's mux registration, as usual.
Reported-by: Rafael J. Wysocki <rjw@sisk.pl>
Reported-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
pinctrl_remove_gpio_range() is now handled by the pinctrl core in the
unreg path for some reason, so use that instead.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This implements simple support for adjusting the pin config value via the
pinctrl API. The pinconf-generic code is abandoned for now until we've
got a chance to revamp the pinmux_type state tracking that's needed by
legacy code.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
While this code is still being shuffled around the KBUILD_MODNAME value
isn't particularly useful, switch to something a bit more useful.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This follows the function support by simply doing 1 pin per group
encapsulation in order to keep with legacy behaviour. This will be
built on incrementally as SoCs define their own pin groups.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
If we encounter invalid entries in the pinmux GPIO range, make sure we've
still got a dummy pin definition but don't otherwise map it.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This maps out all of the function types to pinctrl function groups.
Presently this is restricted to one pin per function to maintain
compatability with legacy behaviour. This will be extended as groups
are introduced and exiting users migrated.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This begins the migration of the PFC core to the pinctrl subsystem.
Initial support is very basic, with the bulk of the implementation simply
being nopped out in such a way to allow registration with the pinctrl
core to succeed.
The gpio chip driver is stripped down considerably now relying purely on
pinctrl API calls to manage the bulk of its operations.
This provides a basis for further PFC refactoring, including decoupling
pin functions from the GPIO API, establishing pin groups, and so forth.
These will all be dealt with incrementally so as to introduce as few
growing and migratory pains to tree-wide PFC pinmux users today.
When the interfaces have been well established and in-tree users have
been migrated off of the legacy interfaces it will be possible to strip
down the core considerably, leading to eventual drivers/pinctrl rehoming.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Paul Mundt
Laurent Pinchart