drm/msm: use devm_gpiod_get_optional for optional reset gpio

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Since 39b2bbe3d7 (gpio: add flags argument to gpiod_get*() functions)
which appeared in v3.17-rc1, the gpiod_get* functions take an additional
parameter that allows to specify direction and initial value for output.

Also there is a variant to find optional gpios that returns NULL if
there is no gpio instead of -ENOENT.

Make use of both features to simplify the driver.

This makes error checking more strict because errors like -ENOSYS ("no
gpio support compiled in") or -EPROBE_DEFER ("gpio not ready yet") are
handled correctly now.

Furthermore this is one caller less that stops us making the flags
argument to gpiod_get*() mandatory.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Rob Clark <robdclark@gmail.com>

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This commit is contained in:

Uwe Kleine-König 2015-05-20 09:21:41 +02:00 • committed by Rob Clark

parent ec31abf668

commit 9590e69db9

1 changed files with 6 additions and 23 deletions

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drivers/gpu/drm/msm/dsi/dsi_host.c

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