diff --git a/Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.txt b/Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.txt
index 26024c48081e..8494295e2927 100644
--- a/Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.txt
+++ b/Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.txt
@@ -58,6 +58,8 @@ Optional properties:
 		bvalid status bit to get vbus status by default.
  - rockchip,vbus-always-on: when set, indicates that the otg vbus
 		is always powered on.
+ - rockchip,low-power-mode: when set, the port will enter low power
+		state when suspend.
 
 Example: