dt-bindings: display: renesas,du: Provide bindings for r8a779a0

Extend the Renesas DU display bindings to support the r8a779a0 V3U.
Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

Documentation/devicetree/bindings/display/renesas,du.yaml

@@ -39,6 +39,7 @@ properties:
       - renesas,du-r8a77980 # for R-Car V3H compatible DU
       - renesas,du-r8a77990 # for R-Car E3 compatible DU
       - renesas,du-r8a77995 # for R-Car D3 compatible DU
+      - renesas,du-r8a779a0 # for R-Car V3U compatible DU
 
   reg:
     maxItems: 1
@@ -773,6 +774,56 @@ allOf:
         - reset-names
         - renesas,vsps
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - renesas,du-r8a779a0
+    then:
+      properties:
+        clocks:
+          items:
+            - description: Functional clock
+
+        clock-names:
+          maxItems: 1
+          items:
+            - const: du.0
+
+        interrupts:
+          maxItems: 2
+
+        resets:
+          maxItems: 1
+
+        reset-names:
+          items:
+            - const: du.0
+
+        ports:
+          properties:
+            port@0:
+              description: DSI 0
+            port@1:
+              description: DSI 1
+            port@2: false
+            port@3: false
+
+          required:
+            - port@0
+            - port@1
+
+        renesas,vsps:
+          minItems: 2
+
+      required:
+        - clock-names
+        - interrupts
+        - resets
+        - reset-names
+        - renesas,vsps
+
 additionalProperties: false
 
 examples: