dt-bindings: display: Document dual-link LVDS display common properties

Dual-link LVDS displays receive odd pixels and even pixels separately from
dual LVDS links.  One link receives odd pixels and the other receives even
pixels.  Some of those displays may also use only one LVDS link to receive
all pixels, being odd and even agnostic.  Document common properties for
those displays by extending LVDS display common properties defined in
lvds.yaml.

Suggested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Liu Ying <victor.liu@nxp.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20241104032806.611890-9-victor.liu@nxp.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

Documentation/devicetree/bindings/display/lvds-dual-ports.yaml

@@ -0,0 +1,63 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/lvds-dual-ports.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Dual-link LVDS Display Common Properties
+
+maintainers:
+  - Liu Ying <victor.liu@nxp.com>
+
+description: |
+  Common properties for LVDS displays with dual LVDS links. Extend LVDS display
+  common properties defined in lvds.yaml.
+
+  Dual-link LVDS displays receive odd pixels and even pixels separately from
+  the dual LVDS links. One link receives odd pixels and the other receives
+  even pixels. Some of those displays may also use only one LVDS link to
+  receive all pixels, being odd and even agnostic.
+
+allOf:
+  - $ref: lvds.yaml#
+
+properties:
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    patternProperties:
+      '^port@[01]$':
+        $ref: /schemas/graph.yaml#/$defs/port-base
+        unevaluatedProperties: false
+        description: |
+          port@0 represents the first LVDS input link.
+          port@1 represents the second LVDS input link.
+
+        properties:
+          dual-lvds-odd-pixels:
+            type: boolean
+            description: LVDS input link for odd pixels
+
+          dual-lvds-even-pixels:
+            type: boolean
+            description: LVDS input link for even pixels
+
+        oneOf:
+          - required: [dual-lvds-odd-pixels]
+          - required: [dual-lvds-even-pixels]
+          - properties:
+              dual-lvds-odd-pixels: false
+              dual-lvds-even-pixels: false
+
+    anyOf:
+      - required:
+          - port@0
+      - required:
+          - port@1
+
+required:
+  - ports
+
+additionalProperties: true
+
+...

Documentation/devicetree/bindings/display/panel/advantech,idk-2121wr.yaml

@@ -20,6 +20,7 @@ description: |
   dual-lvds-odd-pixels or dual-lvds-even-pixels).
 
 allOf:
+  - $ref: /schemas/display/lvds-dual-ports.yaml#
   - $ref: panel-common.yaml#
 
 properties:
@@ -44,22 +45,10 @@ properties:
 
     properties:
       port@0:
-        $ref: /schemas/graph.yaml#/$defs/port-base
-        unevaluatedProperties: false
-        description: The sink for odd pixels.
-        properties:
-          dual-lvds-odd-pixels: true
-
         required:
           - dual-lvds-odd-pixels
 
       port@1:
-        $ref: /schemas/graph.yaml#/$defs/port-base
-        unevaluatedProperties: false
-        description: The sink for even pixels.
-        properties:
-          dual-lvds-even-pixels: true
-
         required:
           - dual-lvds-even-pixels
 
@@ -75,7 +64,6 @@ required:
   - height-mm
   - data-mapping
   - panel-timing
-  - ports
 
 examples:
   - |+

Documentation/devicetree/bindings/display/panel/panel-simple-lvds-dual-ports.yaml

@@ -22,6 +22,7 @@ description: |
   If the panel is more advanced a dedicated binding file is required.
 
 allOf:
+  - $ref: /schemas/display/lvds-dual-ports.yaml#
   - $ref: panel-common.yaml#
 
 properties:
@@ -55,28 +56,10 @@ properties:
 
     properties:
       port@0:
-        $ref: /schemas/graph.yaml#/$defs/port-base
-        unevaluatedProperties: false
-        description: The first sink port.
-
-        properties:
-          dual-lvds-odd-pixels:
-            type: boolean
-            description: The first sink port for odd pixels.
-
         required:
           - dual-lvds-odd-pixels
 
       port@1:
-        $ref: /schemas/graph.yaml#/$defs/port-base
-        unevaluatedProperties: false
-        description: The second sink port.
-
-        properties:
-          dual-lvds-even-pixels:
-            type: boolean
-            description: The second sink port for even pixels.
-
         required:
           - dual-lvds-even-pixels
 
@@ -88,7 +71,6 @@ unevaluatedProperties: false
 
 required:
   - compatible
-  - ports
   - power-supply
 
 examples: