diff --git a/Documentation/devicetree/bindings/phy/rockchip,inno-usb2phy.yaml b/Documentation/devicetree/bindings/phy/rockchip,inno-usb2phy.yaml
index 58e735b5dd05..b95c9e3e44fe 100644
--- a/Documentation/devicetree/bindings/phy/rockchip,inno-usb2phy.yaml
+++ b/Documentation/devicetree/bindings/phy/rockchip,inno-usb2phy.yaml
@@ -145,6 +145,20 @@ anyOf:
       - host-port
 
 allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - rockchip,rk3568-usb2phy
+              - rockchip,rv1108-usb2phy
+    then:
+      required:
+        - rockchip,usbgrf
+    else:
+      properties:
+        rockchip,usbgrf: false
+
   - if:
       properties:
         compatible: