[PATCH v2 1/1] dt-bindings: soc: imx-iomuxc-gpr: allow bridge@18 as child node

[PATCH v2 1/1] dt-bindings: soc: imx-iomuxc-gpr: allow bridge@18 as child node

[Frank.Li]

From: Frank Li <Frank.Li@nxp.com>

The legacy i.MX6SX (>15 year) SoC imx-iomuxc-gpr contains one LDB_CTRL
register. Allow the LVDS Display Bridge(LDB) child node under
imx-iomuxc-gpr.

Fix below CHECK_DTBS warnings:
  arch/arm/boot/dts/nxp/imx/imx6sx-nitrogen6sx.dtb: syscon@20e4000 (fsl,imx6sx-iomuxc-gpr): '#address-cells', '#size-cells', 'bridge@18' do not match any of the regexes: '^ipu[12]_csi[01]_mux$', '^pinctrl-[0-9]+$

Signed-off-by: Frank Li <Frank.Li@nxp.com>
---
change in v2
- remove status = "disabled" at example
---
 .../bindings/soc/imx/fsl,imx-iomuxc-gpr.yaml  | 58 +++++++++++++++++++
 1 file changed, 58 insertions(+)

diff --git a/Documentation/devicetree/bindings/soc/imx/fsl,imx-iomuxc-gpr.yaml b/Documentation/devicetree/bindings/soc/imx/fsl,imx-iomuxc-gpr.yaml
index 721a67e84c137..e1fbdc7e4e057 100644
--- a/Documentation/devicetree/bindings/soc/imx/fsl,imx-iomuxc-gpr.yaml
+++ b/Documentation/devicetree/bindings/soc/imx/fsl,imx-iomuxc-gpr.yaml
@@ -47,10 +47,21 @@ properties:
   reg:
     maxItems: 1
 
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 1
+
   mux-controller:
     type: object
     $ref: /schemas/mux/reg-mux.yaml
 
+  bridge@18:
+    type: object
+    $ref: /schemas/display/bridge/fsl,ldb.yaml#
+    unevaluatedProperties: false
+
 patternProperties:
   "^ipu[12]_csi[01]_mux$":
     type: object
@@ -67,6 +78,18 @@ allOf:
       patternProperties:
         '^ipu[12]_csi[01]_mux$': false
 
+  - if:
+      properties:
+        compatible:
+          not:
+            contains:
+              const: fsl,imx6sx-iomuxc-gpr
+    then:
+      properties:
+        bridge@18: false
+        '#address-cells': false
+        '#size-cells': false
+
 additionalProperties: false
 
 required:
@@ -87,4 +110,39 @@ examples:
         };
     };
 
+  - |
+    #include <dt-bindings/clock/imx6sx-clock.h>
+
+    syscon@20e4000 {
+        compatible = "fsl,imx6sx-iomuxc-gpr", "fsl,imx6q-iomuxc-gpr", "syscon", "simple-mfd";
+        #address-cells = <1>;
+        #size-cells = <1>;
+        reg = <0x020e4000 0x4000>;
+
+        bridge@18 {
+            compatible = "fsl,imx6sx-ldb";
+            reg = <0x18 0x4>;
+            clocks = <&clks IMX6SX_CLK_LDB_DI0>;
+            clock-names = "ldb";
+
+            ports {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                port@0 {
+                    reg = <0>;
+
+                    endpoint {
+                    };
+                };
+
+                port@1 {
+                    reg = <1>;
+
+                    endpoint {
+                    };
+                };
+            };
+        };
+    };
 ...
-- 
2.43.0

Re: [PATCH v2 1/1] dt-bindings: soc: imx-iomuxc-gpr: allow bridge@18 as child node

[Rob Herring (Arm)]

On Fri, 17 Jul 2026 16:15:17 -0400, Frank.Li@oss.nxp.com wrote:
> From: Frank Li <Frank.Li@nxp.com>
> 
> The legacy i.MX6SX (>15 year) SoC imx-iomuxc-gpr contains one LDB_CTRL
> register. Allow the LVDS Display Bridge(LDB) child node under
> imx-iomuxc-gpr.
> 
> Fix below CHECK_DTBS warnings:
>   arch/arm/boot/dts/nxp/imx/imx6sx-nitrogen6sx.dtb: syscon@20e4000 (fsl,imx6sx-iomuxc-gpr): '#address-cells', '#size-cells', 'bridge@18' do not match any of the regexes: '^ipu[12]_csi[01]_mux$', '^pinctrl-[0-9]+$
> 
> Signed-off-by: Frank Li <Frank.Li@nxp.com>
> ---
> change in v2
> - remove status = "disabled" at example
> ---
>  .../bindings/soc/imx/fsl,imx-iomuxc-gpr.yaml  | 58 +++++++++++++++++++
>  1 file changed, 58 insertions(+)
> 

My bot found errors running 'make dt_binding_check' on your patch:

yamllint warnings/errors:

dtschema/dtc warnings/errors:
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/soc/imx/fsl,imx-iomuxc-gpr.example.dtb: syscon@20e4000 (fsl,imx6sx-iomuxc-gpr): bridge@18:reg: [[24, 4]] is too short
	from schema $id: http://devicetree.org/schemas/soc/imx/fsl,imx-iomuxc-gpr.yaml
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/soc/imx/fsl,imx-iomuxc-gpr.example.dtb: bridge@18 (fsl,imx6sx-ldb): reg: [[24, 4]] is too short
	from schema $id: http://devicetree.org/schemas/display/bridge/fsl,ldb.yaml

doc reference errors (make refcheckdocs):

See https://patchwork.kernel.org/project/devicetree/patch/20260717201519.844259-1-Frank.Li@oss.nxp.com

The base for the series is generally the latest rc1. A different dependency
should be noted in *this* patch.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit after running the above command yourself. Note
that DT_SCHEMA_FILES can be set to your schema file to speed up checking
your schema. However, it must be unset to test all examples with your schema.