diff --git a/Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.txt b/Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.txt
index 8494295e2927..f33ec971e575 100644
--- a/Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.txt
+++ b/Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.txt
@@ -91,3 +91,44 @@ grf: syscon@ff770000 {
 		};
 	};
 };
+
+Required properties (usb2phy grf node):
+ - compatible : should be one of the listed compatibles:
+		"rockchip,rk3328-usb2phy-grf", "syscon", "simple-mfd";
+ - reg : the address offset of grf for usb-phy configuration.
+ - #address-cells : should be 1.
+ - #size-cells : should be 1.
+
+Required nodes : a sub-node is required for the phy provides.
+		 The sub-node name is used to identify each phy,
+		 and shall be the following entries:
+
+Example:
+
+usb2phy_grf: syscon@ff450000 {
+	compatible = "rockchip,rk3328-usb2phy-grf", "syscon",
+		     "simple-mfd";
+	reg = <0x0 0xff450000 0x0 0x10000>;
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	u2phy: usb2-phy@100 {
+		compatible = "rockchip,rk3328-usb2phy";
+		reg = <0x100 0x10>;
+		clocks = <&xin24m>;
+		clock-names = "phyclk";
+		#clock-cells = <0>;
+		assigned-clocks = <&cru USB480M>;
+		assigned-clock-parents = <&u2phy>;
+		clock-output-names = "usb480m_phy";
+		status = "disabled";
+
+		u2phy_host: host-port {
+			#phy-cells = <0>;
+			interrupts = <GIC_SPI 62 IRQ_TYPE_LEVEL_HIGH>;
+			interrupt-names = "linestate";
+			status = "disabled";
+		};
+	};
+};
+