diff --git a/Documentation/devicetree/bindings/sound/cirrus,cs42xx8.yaml b/Documentation/devicetree/bindings/sound/cirrus,cs42xx8.yaml
index 725b47e82062..cd47905eb20a 100644
--- a/Documentation/devicetree/bindings/sound/cirrus,cs42xx8.yaml
+++ b/Documentation/devicetree/bindings/sound/cirrus,cs42xx8.yaml
@@ -41,6 +41,10 @@ properties:
     description: This pin is connected to the chip's RESET pin.
     maxItems: 1
 
+  port:
+    $ref: audio-graph-port.yaml#
+    unevaluatedProperties: false
+
 required:
   - compatible
   - reg