gpio: samsung: add flags specifier to device-tree binding
This adds a flags field to the gpio specifier for Samsung. I didn't want to add yet another field in the already quite long specifier, so I decided to compress it together with the Pull Up/Down settings instead. This is needed to, for example, have a gpio-keys input that is active low. Signed-off-by: NOlof Johansson <olof@lixom.net> Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
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