diff --git a/Documentation/devicetree/bindings/phy/fsl,imx8mq-usb-phy.yaml b/Documentation/devicetree/bindings/phy/fsl,imx8mq-usb-phy.yaml
index 2936f3510a6ada5e1a0ad8805646a39bd85f6cc1..5ba9570ad7bf279f9df40d27ea35daccb1df812a 100644
--- a/Documentation/devicetree/bindings/phy/fsl,imx8mq-usb-phy.yaml
+++ b/Documentation/devicetree/bindings/phy/fsl,imx8mq-usb-phy.yaml
@@ -28,6 +28,9 @@ properties:
     items:
       - const: phy
 
+  power-domains:
+    maxItems: 1
+
   vbus-supply:
     description:
       A phandle to the regulator for USB VBUS.