dt-bindings: add compatible string for Allwinner R40 pinctrl
Allwinner R40 has a pin controller like the ones in older Allwinner SoCs (especially A20), and can use modified version of the A10/A20 pinctrl driver. Add a compatible string for it. Signed-off-by: NIcenowy Zheng <icenowy@aosc.io> Acked-by: NRob Herring <robh@kernel.org> Reviewed-by: NChen-Yu Tsai <wens@csie.org> Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
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