diff --git a/Documentation/devicetree/bindings/sound/realtek,rt5616.yaml b/Documentation/devicetree/bindings/sound/realtek,rt5616.yaml
index 754111f2e70a..29071044c66e 100644
--- a/Documentation/devicetree/bindings/sound/realtek,rt5616.yaml
+++ b/Documentation/devicetree/bindings/sound/realtek,rt5616.yaml
@@ -38,6 +38,10 @@ properties:
     items:
       - const: mclk
 
+  port:
+    $ref: audio-graph-port.yaml#
+    unevaluatedProperties: false
+
 required:
   - compatible
   - reg