dt-bindings: display: allow port and ports in panel-lvds

Both port and ports names may be used in a panel-lvds binding
  port - for a single port
  ports - if there is more than one port in sub-nodes

Fixes the following warning:
advantech,idk-2121wr.example.dt.yaml: panel-lvds: 'port' is a required property

advantech,idk-2121wr.yaml needs several ports, so uses a ports node.

v2:
  - Use oneOf - makes the logic more obvious (Rob)
  - Added Fixes tag
  - Added port: true, ports:true

v3:
  - Indent port/ports in required two spaces (Rob)

Signed-off-by: Sam Ravnborg <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Cc: Rob Herring <[email protected]>
Fixes: 8efef33 ("dt-bindings: display: Add idk-2121wr binding")
Cc: Fabrizio Castro <[email protected]>
Cc: Lad Prabhakar <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Cc: Thierry Reding <[email protected]>
Cc: [email protected]
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
(cherry picked from commit 8089a62)
Signed-off-by: Sam Ravnborg <[email protected]>

Author: sravnborg

Documentation/devicetree/bindings/display/panel/lvds.yaml

@@ -96,12 +96,20 @@ properties:
       If set, reverse the bit order described in the data mappings below on all
       data lanes, transmitting bits for slots 6 to 0 instead of 0 to 6.
 
+  port: true
+  ports: true
+
 required:
   - compatible
   - data-mapping
   - width-mm
   - height-mm
   - panel-timing
-  - port
+
+oneOf:
+  - required:
+      - port
+  - required:
+      - ports
 
 ...