diff --git a/Documentation/devicetree/bindings/mfd/mediatek,mt6397.yaml b/Documentation/devicetree/bindings/mfd/mediatek,mt6397.yaml
index d2de227ae7a6..bbd56e522a75 100644
--- a/Documentation/devicetree/bindings/mfd/mediatek,mt6397.yaml
+++ b/Documentation/devicetree/bindings/mfd/mediatek,mt6397.yaml
@@ -57,6 +57,9 @@ properties:
   "#interrupt-cells":
     const: 2
 
+  "#sound-dai-cells":
+    const: 1
+
   rtc:
     type: object
     $ref: /schemas/rtc/rtc.yaml#