[PATCH v3 4/6] dt-bindings: dma: arm,dma-350: Document the CIX Sky1 integration

[Conor Dooley]

On Mon, Oct 12, 2026 at 04:41:53PM +0800, Jelly Jia wrote:
> The CIX Sky1 DMA-350 integration is the same device with SoC glue around
> it, so it is described by the arm,dma-350 node itself with an additional
> "cix,sky1-dma350" compatible rather than by a separate wrapper node.
> 
> Extend the binding with the CIX compatible and the resources the
> integration needs: a clock, which the CIX variant requires, an optional
> reset, and an optional reserved memory region used when the controller
> cannot reach all of system memory.
> 
> v2 -> v3:
> - Drop the cix,irq-router property and its conditional: the Sky1
>   interrupt gate it described is set up by the boot firmware and is not
>   configured by Linux, so no property describes it.
> - The CIX compatible now requires a clock.
> 
> Assisted-by: LLM checkpatch sparse dt_binding_check dtbs_check
> Signed-off-by: Jelly Jia <Jelly.Jia at cixtech.com>
> ---
>  .../devicetree/bindings/dma/arm,dma-350.yaml  | 26 ++++++++++++++++++-
>  1 file changed, 25 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/dma/arm,dma-350.yaml b/Documentation/devicetree/bindings/dma/arm,dma-350.yaml
> index 429f682f15d8..4e0f9ffb0039 100644
> --- a/Documentation/devicetree/bindings/dma/arm,dma-350.yaml
> +++ b/Documentation/devicetree/bindings/dma/arm,dma-350.yaml
> @@ -11,10 +11,22 @@ maintainers:
>  
>  allOf:
>    - $ref: dma-controller.yaml#
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: cix,sky1-dma350
> +    then:
> +      required:
> +        - clocks
>  
>  properties:
>    compatible:
> -    const: arm,dma-350
> +    oneOf:
> +      - const: arm,dma-350
> +      - items:
> +          - const: cix,sky1-dma350
> +          - const: arm,dma-350

Provided the device is actually functional if the fallback compatible is
used, this patch is fine. Otherwise, please drop the fallback from here.

Thanks,
Conor.

>  
>    reg:
>      items:
> @@ -36,6 +48,18 @@ properties:
>      const: 1
>      description: The cell is the trigger input number
>  
> +  clocks:
> +    maxItems: 1
> +
> +  resets:
> +    maxItems: 1
> +
> +  memory-region:
> +    maxItems: 1
> +    description:
> +      Reserved memory region used for DMA allocations when the controller
> +      cannot reach all of system memory.
> +
>  required:
>    - compatible
>    - reg
> -- 
> 2.54.0
> 
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