[PATCH 1/2] dt-bindings: display: verisilicon,dc: generalize for DCUltra Lite variant

[Rob Herring (Arm)]

On Mon, 11 May 2026 15:51:41 +0800, Joey Lu wrote:
> Extend the verisilicon,dc base schema to accommodate the Nuvoton MA35D1
> DCUltra Lite (a previous generation of the DC8000 series) which has a
> different clock topology, no reset control, and a single output.
> 
> - Replace the fixed clock/reset item lists with minItems/maxItems ranges
>   so sub-schemas can enforce variant-specific constraints
> - Add a 'port' property (single-port alias) alongside the existing 'ports'
>   for single-output variants
> - Remove the mandatory 'ports' requirement from the base schema; sub-schemas
>   shall enforce their own port topology
> - Add a 'select' stanza so the validator matches any node whose compatible
>   contains a known Verisilicon DC string, including SoC-specific glue
> - Relax additionalProperties to allow unevaluatedProperties enforcement in
>   sub-schemas
> - Fix a minor whitespace issue in the port at 0 description
> 
> Add nuvoton,ma35d1-dcu.yaml as a sub-schema for the Nuvoton MA35D1 DCUltra
> Lite display controller:
> 
> The Nuvoton MA35D1 integrates the Verisilicon DCUltra Lite display
> controller. It is a single-output display controller with a 32-bit
> RGB (DPI) interface. Unlike the DC8000, it does not have discoverable
> chip identity registers, does not support the CONFIG_EX commit path,
> and uses dedicated IRQ status/enable registers at offsets 0x147C/0x1480.
> The clock topology uses two clocks (bus gate and pixel divider) and
> does not require explicit reset control from the driver.
> 
> Signed-off-by: Joey Lu <a0987203069 at gmail.com>
> ---
>  .../bindings/display/nuvoton,ma35d1-dcu.yaml  | 94 +++++++++++++++++++
>  .../bindings/display/verisilicon,dc.yaml      | 64 +++++++------
>  2 files changed, 131 insertions(+), 27 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/display/nuvoton,ma35d1-dcu.yaml
> 

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/display/nuvoton,ma35d1-dcu.yaml: allOf:0:$ref: 'http://devicetree.org/schemas/display/verisilicon,dc.yaml#' should not be valid under {'pattern': '^https?://'}
	hint: References must start with '/schemas' or be relative to current schema's path.
	from schema $id: http://devicetree.org/meta-schemas/keywords.yaml

doc reference errors (make refcheckdocs):

See https://patchwork.kernel.org/project/devicetree/patch/20260511075142.54752-2-a0987203069@gmail.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.