diff --git a/Documentation/devicetree/bindings/sound/rockchip-spdif.yaml b/Documentation/devicetree/bindings/sound/rockchip-spdif.yaml
index f381dbbf5de6..c467152656f7 100644
--- a/Documentation/devicetree/bindings/sound/rockchip-spdif.yaml
+++ b/Documentation/devicetree/bindings/sound/rockchip-spdif.yaml
@@ -51,6 +51,9 @@ properties:
   dma-names:
     const: tx
 
+  power-domains:
+    maxItems: 1
+
   rockchip,grf:
     $ref: /schemas/types.yaml#/definitions/phandle
     description: