[PATCH 1/4] dt-bindings: display: bridge: ldb: allow a single reg for fsl,imx6sx-ldb

[Frank . Li]

From: Frank Li <Frank.Li@xxxxxxx>

The i.MX6SX LDB only provides a single register region for the LDB block,
while other supported LDB variants require two register regions.

Update the binding schema to allow a single reg entry for
fsl,imx6sx-ldb while keeping the existing constraints unchanged for the
other compatible strings.

Fix below DTB_CHECK warings:
  arch/arm/boot/dts/nxp/imx/imx6sx-nitrogen6sx.dtb: bridge@18 (fsl,imx6sx-ldb): reg: [[24, 4]] is too short

Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
---
Related two theads:
- https://lore.kernel.org/imx/178154922879.1630652.11500293336634076421.robh@xxxxxxxxxx/

Mixing the addressable and non-addressable child nodes is allowed according to discussion [1].

Link: https://lore.kernel.org/all/n6akxiayi3g6gxcqhreb4iaohmeokoalnqup6h5r2fwdt4zijt@u2wyps55ayqm/ [1]
---
 .../bindings/display/bridge/fsl,ldb.yaml           | 23 +++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml b/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml
index 7f380879fffdf..e5a8870bb76a6 100644
--- a/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml
+++ b/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml
@@ -28,9 +28,11 @@ properties:
     const: ldb
 
   reg:
+    minItems: 1
     maxItems: 2
 
   reg-names:
+    minItems: 1
     items:
       - const: ldb
       - const: lvds
@@ -83,15 +85,6 @@ allOf:
         ports:
           properties:
             port@2: false
-  - if:
-      not:
-        properties:
-          compatible:
-            contains:
-              const: fsl,imx6sx-ldb
-    then:
-      required:
-        - reg-names
 
   - if:
       properties:
@@ -100,7 +93,19 @@ allOf:
             const: fsl,imx6sx-ldb
     then:
       properties:
+        reg:
+          maxItems: 1
+        reg-names:
+          maxItems: 1
         nxp,enable-termination-resistor: false
+    else:
+      required:
+        - reg-names
+      properties:
+        reg:
+          minItems: 2
+        reg-names:
+          minItems: 2
 
 additionalProperties: false
 

-- 
2.43.0