[PATCH v4 1/6] dt-bindings: display: verisilicon, dc: generalize for single-output variants

[Joey Lu <a0987203069@gmail.com>]

The existing schema hard-codes the five-clock/three-reset/dual-port
topology of the DC8200 IP block, preventing reuse for single-output
variants such as the Verisilicon DCUltraLite used in the Nuvoton MA35D1
SoC.

Rework the schema so that variant-specific constraints are expressed via
allOf/if blocks:

- Add nuvoton,ma35d1-dcu to the SoC-specific compatible enum.  The
  generic verisilicon,dc fallback remains the driver-binding string.
- Move clock and reset items descriptions into the per-variant allOf/if
  blocks; keep only minItems/maxItems at the top level so the base schema
  accepts all variants.
- Restore full items lists for clock-names and reset-names at the top
  level with minItems so the names are validated against the descriptions.
- Keep ports in the global required list and keep additionalProperties: false.
- Add an allOf/if block for thead,th1520-dc8200: five-clock (core, axi,
  ahb, pix0, pix1), three-reset (core, axi, ahb), required resets.
- Add an allOf/if block for nuvoton,ma35d1-dcu: two-clock (core, pix0),
  one-reset (core), required resets.

Signed-off-by: Joey Lu <a0987203069@gmail.com>
---
 .../bindings/display/verisilicon,dc.yaml      | 80 +++++++++++++++++--
 1 file changed, 73 insertions(+), 7 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/verisilicon,dc.yaml b/Documentation/devicetree/bindings/display/verisilicon,dc.yaml
index 9dc35ab973f2..0c41286b8223 100644
--- a/Documentation/devicetree/bindings/display/verisilicon,dc.yaml
+++ b/Documentation/devicetree/bindings/display/verisilicon,dc.yaml
@@ -17,6 +17,7 @@ properties:
     items:
       - enum:
           - thead,th1520-dc8200
+          - nuvoton,ma35d1-dcu
       - const: verisilicon,dc # DC IPs have discoverable ID/revision registers
 
   reg:
@@ -26,14 +27,12 @@ properties:
     maxItems: 1
 
   clocks:
-    items:
-      - description: DC Core clock
-      - description: DMA AXI bus clock
-      - description: Configuration AHB bus clock
-      - description: Pixel clock of output 0
-      - description: Pixel clock of output 1
+    minItems: 2
+    maxItems: 5
 
   clock-names:
+    minItems: 2
+    maxItems: 5
     items:
       - const: core
       - const: axi
@@ -42,12 +41,16 @@ properties:
       - const: pix1
 
   resets:
+    minItems: 1
+    maxItems: 3
     items:
       - description: DC Core reset
       - description: DMA AXI bus reset
       - description: Configuration AHB bus reset
 
   reset-names:
+    minItems: 1
+    maxItems: 3
     items:
       - const: core
       - const: axi
@@ -59,7 +62,7 @@ properties:
     properties:
       port@0:
         $ref: /schemas/graph.yaml#/properties/port
-        description: The first output channel , endpoint 0 should be
+        description: The first output channel, endpoint 0 should be
           used for DPI format output and endpoint 1 should be used
           for DP format output.
 
@@ -77,6 +80,69 @@ required:
   - clock-names
   - ports
 
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: thead,th1520-dc8200
+    then:
+      properties:
+        clocks:
+          minItems: 5
+          maxItems: 5
+          items:
+            - description: DC Core clock
+            - description: DMA AXI bus clock
+            - description: Configuration AHB bus clock
+            - description: Pixel clock of output 0
+            - description: Pixel clock of output 1
+
+        clock-names:
+          minItems: 5
+          maxItems: 5
+
+        resets:
+          minItems: 3
+          maxItems: 3
+
+        reset-names:
+          minItems: 3
+          maxItems: 3
+
+      required:
+        - resets
+        - reset-names
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: nuvoton,ma35d1-dcu
+    then:
+      properties:
+        clocks:
+          minItems: 2
+          maxItems: 2
+          items:
+            - description: DC Core clock
+            - description: Pixel clock of output 0
+
+        clock-names:
+          minItems: 2
+          maxItems: 2
+
+        resets:
+          minItems: 1
+          maxItems: 1
+
+        reset-names:
+          maxItems: 1
+
+      required:
+        - resets
+        - reset-names
+
 additionalProperties: false
 
 examples:
-- 
2.43.0