maintainers:
   - Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
 
-definitions:
-  port-def:
-    $ref: audio-graph-port.yaml#/definitions/port-base
-    unevaluatedProperties: false
-    patternProperties:
-      "^endpoint(@[0-9a-f]+)?":
-        $ref: audio-graph-port.yaml#/definitions/endpoint-base
-        properties:
-          playback:
-            $ref: /schemas/types.yaml#/definitions/phandle-array
-          capture:
-            $ref: /schemas/types.yaml#/definitions/phandle-array
-        unevaluatedProperties: false
-
 properties:
 
   compatible:
 
   # ports is below
   port:
-    $ref: "#/definitions/port-def"
+    $ref: audio-graph-port.yaml#/definitions/port-base
+    unevaluatedProperties: false
+    patternProperties:
+      "^endpoint(@[0-9a-f]+)?":
+        $ref: audio-graph-port.yaml#/definitions/endpoint-base
+        properties:
+          playback:
+            $ref: /schemas/types.yaml#/definitions/phandle-array
+          capture:
+            $ref: /schemas/types.yaml#/definitions/phandle-array
+        unevaluatedProperties: false
 
   rcar_sound,dvc:
     description: DVC subnode.
     unevaluatedProperties: false
     patternProperties:
       '^port(@[0-9a-f]+)?$':
-        $ref: "#/definitions/port-def"
+        $ref: "#/properties/port"
 
 required:
   - compatible