[PATCH 1/4] dt-bindings: display: renesas,rzg2l-du: Add RZ/T2H and RZ/N2H support

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>

Document the Display Unit (DU) support for the RZ/T2H and RZ/N2H SoCs.

The DU block on RZ/T2H is functionally equivalent to the RZ/G2UL DU and
supports the DPI interface, but includes SoC-specific register differences.
Add a dedicated compatible string to represent this variant.

As the DU implementation on RZ/N2H matches RZ/T2H, describe it using an
RZ/N2H specific compatible string with the RZ/T2H compatible as fallback.

Unlike other DU variants which use a multi-port model, the RZ/T2H and
RZ/N2H DU has a single output and is modelled using a single port node
with one endpoint. Add a port property to support this and update the
allOf constraints accordingly.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
---
 .../bindings/display/renesas,rzg2l-du.yaml    | 24 +++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/renesas,rzg2l-du.yaml b/Documentation/devicetree/bindings/display/renesas,rzg2l-du.yaml
index 2cc66dcef870..45678d536a75 100644
--- a/Documentation/devicetree/bindings/display/renesas,rzg2l-du.yaml
+++ b/Documentation/devicetree/bindings/display/renesas,rzg2l-du.yaml
@@ -21,6 +21,7 @@ properties:
           - renesas,r9a07g043u-du # RZ/G2UL
           - renesas,r9a07g044-du # RZ/G2{L,LC}
           - renesas,r9a09g057-du # RZ/V2H(P)
+          - renesas,r9a09g077-du # RZ/T2H
       - items:
           - enum:
               - renesas,r9a07g054-du    # RZ/V2L
@@ -28,6 +29,9 @@ properties:
       - items:
           - const: renesas,r9a09g056-du # RZ/V2N
           - const: renesas,r9a09g057-du # RZ/V2H(P) fallback
+      - items:
+          - const: renesas,r9a09g087-du # RZ/N2H
+          - const: renesas,r9a09g077-du # RZ/T2H fallback
 
   reg:
     maxItems: 1
@@ -53,6 +57,10 @@ properties:
   power-domains:
     maxItems: 1
 
+  port:
+    $ref: /schemas/graph.yaml#/properties/port
+    description: Single output port for single-output DU variants.
+
   ports:
     $ref: /schemas/graph.yaml#/properties/ports
     description: |
@@ -83,9 +91,7 @@ required:
   - interrupts
   - clocks
   - clock-names
-  - resets
   - power-domains
-  - ports
   - renesas,vsps
 
 additionalProperties: false
@@ -137,6 +143,20 @@ allOf:
 
           required:
             - port@0
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,r9a09g077-du
+    then:
+      properties:
+        resets: false
+      required:
+        - port
+    else:
+      required:
+        - resets
+        - ports
 
 examples:
   # RZ/G2L DU
-- 
2.54.0