[PATCH v6 10/21] dt-bindings: display: renesas, rzg2l-du: Add support for RZ/G3E SoC

[Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>]

The RZ/G3E SoC has 2 LCD controllers (LCDC), each containing a Frame
Compression Processor (FCPVD), a Video Signal Processor (VSPD), and a
Display Unit (DU).

 - LCDC0 supports DSI and LVDS (single or dual-channel) outputs.
 - LCDC1 supports DSI, LVDS (single-channel), and RGB outputs.

Add a new SoC-specific compatible string 'renesas,r9a09g047-du'.

Extend patternProperties from "^port@[0-1]$" to "^port@[0-3]$" to
allow up to four output ports, and explicitly disable port@2 and port@3
for existing SoCs that do not expose them.

Describe the four output ports of the RZ/G3E DU:

 - port@0: DSI (available on both LCDC instances)
 - port@1: DPAD / parallel RGB (LCDC1 only)
 - port@2: LVDS channel 0 (LCDC0 only)
 - port@3: LVDS channel 1 (available on both LCDC instances)

Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
---
v5->v6:
 - Extend patternProperties from "^port@[0-1]$" to "^port@[0-3]$" and
   explicitly disable port@2 and port@3 for existing SoCs that do not expose
   them.
 - Reworked ports numbering + improved/fixed ports descriptions in the
   bindings documentation.
 - Improved commit body.

v4->v5:
 - Dropped renesas,id property and updated bindings
   accordingly.

v2->v3:
 - No changes.

v2->v3:
 - No changes.

v1->v2:
 - Use single compatible string instead of multiple compatible strings
   for the two DU instances, leveraging a 'renesas,id' property to
   differentiate between DU0 and DU1.
 - Updated commit message accordingly.

 .../bindings/display/renesas,rzg2l-du.yaml    | 30 ++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/display/renesas,rzg2l-du.yaml b/Documentation/devicetree/bindings/display/renesas,rzg2l-du.yaml
index 5add3b832eab..32da0b5ec88c 100644
--- a/Documentation/devicetree/bindings/display/renesas,rzg2l-du.yaml
+++ b/Documentation/devicetree/bindings/display/renesas,rzg2l-du.yaml
@@ -20,6 +20,7 @@ properties:
       - enum:
           - renesas,r9a07g043u-du # RZ/G2UL
           - renesas,r9a07g044-du # RZ/G2{L,LC}
+          - renesas,r9a09g047-du # RZ/G3E
           - renesas,r9a09g057-du # RZ/V2H(P)
       - items:
           - enum:
@@ -61,7 +62,7 @@ properties:
       model-dependent. Each port shall have a single endpoint.
 
     patternProperties:
-      "^port@[0-1]$":
+      "^port@[0-3]$":
         $ref: /schemas/graph.yaml#/properties/port
         unevaluatedProperties: false
 
@@ -103,6 +104,8 @@ allOf:
             port@0:
               description: DPI
             port@1: false
+            port@2: false
+            port@3: false
 
           required:
             - port@0
@@ -119,6 +122,8 @@ allOf:
               description: DSI
             port@1:
               description: DPI
+            port@2: false
+            port@3: false
 
           required:
             - port@0
@@ -135,9 +140,32 @@ allOf:
             port@0:
               description: DSI
             port@1: false
+            port@2: false
+            port@3: false
 
           required:
             - port@0
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,r9a09g047-du
+    then:
+      properties:
+        ports:
+          properties:
+            port@0:
+              description: DSI
+            port@1:
+              description: DPAD
+            port@2:
+              description: LVDS, Channel 0
+            port@3:
+              description: LVDS, Channel 1
+
+          required:
+            - port@0
+            - port@3
 
 examples:
   # RZ/G2L DU
-- 
2.43.0