drm: bridge: ps8622 and ptn3460 depend on gpiolib

[treding@nvidia.com (Thierry Reding)]

On Wed, Feb 18, 2015 at 05:09:25PM +0100, Arnd Bergmann wrote:
> The ptn3460 driver recently started usign the gpiod interface
> which is only available on platforms that come with GPIOLIB
> support, resulting in a compile-time error:
> 
> drivers/gpu/drm/bridge/ps8622.c: In function 'ps8622_pre_enable':
> drivers/gpu/drm/bridge/ps8622.c:368:2: error: implicit declaration of function 'gpiod_set_value' [-Werror=implicit-function-declaration]
>   gpiod_set_value(ps8622->gpio_rst, 0);
>   ^
> drivers/gpu/drm/bridge/ps8622.c: In function 'ps8622_probe':
> drivers/gpu/drm/bridge/ps8622.c:584:2: error: implicit declaration of function 'devm_gpiod_get' [-Werror=implicit-function-declaration]
>   ps8622->gpio_slp = devm_gpiod_get(dev, "sleep");
>   ^
> 
> Similarly, the newly added ps8622 driver started out with the same
> problem.
> 
> This patch adds explicit Kconfig dependencies to avoid trying to
> build invalid configurations.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> Fixes: f1336e6afb ("drm/bridge: Add I2C based driver for ps8622/ps8625 bridge")
> Fixes: af478d8823 ("drm/bridge: ptn3460: use gpiod interface")

Applied, thanks.

Thierry
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