Users of the DT graph binding now should reference it for their 'port'
schemas, so add it for Mediatek MTU3 binding.

Cc: Chunfeng Yun <chunfeng....@mediatek.com>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Cc: linux-...@vger.kernel.org
Signed-off-by: Rob Herring <r...@kernel.org>
---
 Documentation/devicetree/bindings/usb/mediatek,mtu3.yaml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/usb/mediatek,mtu3.yaml 
b/Documentation/devicetree/bindings/usb/mediatek,mtu3.yaml
index f5c04b9d2de9..ca11a70ece7f 100644
--- a/Documentation/devicetree/bindings/usb/mediatek,mtu3.yaml
+++ b/Documentation/devicetree/bindings/usb/mediatek,mtu3.yaml
@@ -126,7 +126,7 @@ properties:
       Any connector to the data bus of this controller should be modelled
       using the OF graph bindings specified, if the "usb-role-switch"
       property is used. See graph.txt
-    type: object
+    $ref: /schemas/graph.yaml#/properties/port
 
   enable-manual-drd:
     $ref: /schemas/types.yaml#/definitions/flag
-- 
2.27.0

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