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diff --git a/Documentation/devicetree/bindings/phy/rockchip-usb-phy.txt b/Documentation/devicetree/bindings/phy/rockchip-usb-phy.txt
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+ROCKCHIP USB2 PHY
+
+Required properties:
+ - compatible: rockchip,rk3288-usb-phy
+ - rockchip,grf : phandle to the syscon managing the "general
+   register files"
+ - #address-cells: should be 1
+ - #size-cells: should be 0
+
+Sub-nodes:
+Each PHY should be represented as a sub-node.
+
+Sub-nodes
+required properties:
+- #phy-cells: should be 0
+- reg: PHY configure reg address offset in GRF
+                "0x320" - for PHY attach to OTG controller
+                "0x334" - for PHY attach to HOST0 controller
+                "0x348" - for PHY attach to HOST1 controller
+
+Optional Properties:
+- clocks : phandle + clock specifier for the phy clocks
+- clock-names: string, clock name, must be "phyclk"
+
+Example:
+
+usbphy: phy {
+        compatible = "rockchip,rk3288-usb-phy";
+        rockchip,grf = <&grf>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        usbphy0: usb-phy0 {
+                #phy-cells = <0>;
+                reg = <0x320>;
+        };
+};