Required properties for iomux controller:
- compatible: one of "rockchip,rk2928-pinctrl", "rockchip,rk3066a-pinctrl"
"rockchip,rk3066b-pinctrl", "rockchip,rk3188-pinctrl"
- "rockchip,rk3288-pinctrl", "rockchip,rk3368-pinctrl"
+ "rockchip,rk3228-pinctrl", "rockchip,rk3288-pinctrl"
+ "rockchip,rk3328-pinctrl", "rockchip,rk3366-pinctrl"
+ "rockchip,rk3368-pinctrl", "rockchip,rk3399-pinctrl"
- rockchip,grf: phandle referencing a syscon providing the
"general register files"