[PATCH v4 1/4] dt-bindings: display: renesas, rzg2l-du: Document RZ/G2UL DU bindings

[Biju Das]

Document DU found in RZ/G2UL SoC. The DU block is identical to RZ/G2L
SoC, but has only DPI interface.

While at it, add missing required property port at 1 for RZ/G2L and RZ/V2L
SoCs. Currently there is no user for the DPI interface and hence there
won't be any ABI breakage for adding port at 1 as required property for
RZ/G2L and RZ/V2L SoCs.

Acked-by: Conor Dooley <conor.dooley at microchip.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas at glider.be>
Signed-off-by: Biju Das <biju.das.jz at bp.renesas.com>
---
v3->v4:
 * Restored the ports property for RZ/G2UL and described port at 0 for the
   DPI interface.
 * Restored tags from Geert and Conor as the change is trivial
   (Replaced port 1->0 from v2).
v2->v3:
 * Replaced ports->port property for RZ/G2UL as it supports only DPI.
   and retained ports property for RZ/{G2L,V2L} as it supports both DSI
   and DPI output interface.
 * Added missing blank line before example.
 * Dropped tags from Conor and Geert as there are new changes.
v1->v2:
 * Updated commit description related to non ABI breakage.
 * Added Ack from Conor.
---
 .../bindings/display/renesas,rzg2l-du.yaml    | 32 +++++++++++++++++--
 1 file changed, 29 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/renesas,rzg2l-du.yaml b/Documentation/devicetree/bindings/display/renesas,rzg2l-du.yaml
index 08e5b9478051..95e3d5e74b87 100644
--- a/Documentation/devicetree/bindings/display/renesas,rzg2l-du.yaml
+++ b/Documentation/devicetree/bindings/display/renesas,rzg2l-du.yaml
@@ -18,6 +18,7 @@ properties:
   compatible:
     oneOf:
       - enum:
+          - renesas,r9a07g043u-du # RZ/G2UL
           - renesas,r9a07g044-du # RZ/G2{L,LC}
       - items:
           - enum:
@@ -60,9 +61,6 @@ properties:
         $ref: /schemas/graph.yaml#/properties/port
         unevaluatedProperties: false
 
-    required:
-      - port at 0
-
     unevaluatedProperties: false
 
   renesas,vsps:
@@ -88,6 +86,34 @@ required:
 
 additionalProperties: false
 
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,r9a07g043u-du
+    then:
+      properties:
+        ports:
+          properties:
+            port at 0:
+              description: DPI
+
+          required:
+            - port at 0
+    else:
+      properties:
+        ports:
+          properties:
+            port at 0:
+              description: DSI
+            port at 1:
+              description: DPI
+
+          required:
+            - port at 0
+            - port at 1
+
 examples:
   # RZ/G2L DU
   - |
-- 
2.43.0