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" Optional properties: - clock-names: Should contain "emmcclk". Although this is listed as optional (because most boards can get basic functionality without having access to it), it is strongly suggested. See ../clock/clock-bindings.txt for details. - clocks: Should have a phandle to the card clock exported by the SDHCI driver. - drive-impedance-ohm: Specifies the drive impedance in Ohm. Possible values are 33, 40, 50, 66 and 100. If not set, the default value of 50 will be applied. 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>; clocks = <&sdhci>; clock-names = "emmcclk"; drive-impedance-ohm = <50>; #phy-cells = <0>; }; };