pinctrl: rockchip: implement PIN_CONFIG_OUTPUT handling
In some cases it is nice to be able to simply control a gpio output via the PIN_CONFIG_OUTPUT option without having a driver control it. Thus add support for it to the rockchip pinctrl driver. Signed-off-by: NHeiko Stuebner <heiko@sntech.de> Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
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