Rockchip EMMC PHY
-----------------------

Required properties:
 - compatible: rockchip,rk3399-emmc-phy
 - #phy-cells: must be 0
 - reg: PHY register address offset and length in "general
   register files"

Example:


grf: syscon@ff770000 {
	compatible = "rockchip,rk3399-grf", "syscon", "simple-mfd";
	#address-cells = <1>;
	#size-cells = <1>;

...

	emmcphy: phy@f780 {
		compatible = "rockchip,rk3399-emmc-phy";
		reg = <0xf780 0x20>;
		#phy-cells = <0>;
	};
};