dt-bindings: add documentation for rk1108 pinctrl

This adds the dt-binding documentation for rk1108 pinctrl

Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
1 file changed