Re: [PATCH v3 01/10] dt-bindings: memory: mtk-smi: Document #access-controller-cells

[Rob Herring <robh@kernel.org>]

On Tue, Aug 05, 2025 at 09:47:37AM +0200, AngeloGioacchino Del Regno wrote:
> Some of the SMI Common HW provides access control to at least
> the power controller: document the #access-controller-cells
> property and allow specifying it only for MT8183 and MT8365
> as those are the only known SoCs with an SMI acting as access
> controller.
> 
> Reviewed-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> ---
>  .../memory-controllers/mediatek,smi-common.yaml  | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/memory-controllers/mediatek,smi-common.yaml b/Documentation/devicetree/bindings/memory-controllers/mediatek,smi-common.yaml
> index 0762e0ff66ef..74b355a08493 100644
> --- a/Documentation/devicetree/bindings/memory-controllers/mediatek,smi-common.yaml
> +++ b/Documentation/devicetree/bindings/memory-controllers/mediatek,smi-common.yaml
> @@ -74,6 +74,9 @@ properties:
>      minItems: 2
>      maxItems: 4
>  
> +  '#access-controller-cells':
> +    const: 0

I'm still wondering why this is 0? That seems odd that an access 
controller is 1:1 with a device.

> +
>    mediatek,smi:
>      $ref: /schemas/types.yaml#/definitions/phandle
>      description: a phandle to the smi-common node above. Only for sub-common.
> @@ -168,6 +171,19 @@ allOf:
>              - const: apb
>              - const: smi
>  
> +  - if:  # for SMI providing access control
> +      properties:
> +        compatible:
> +          enum:
> +            - mediatek,mt8183-smi-common
> +            - mediatek,mt8365-smi-common
> +    then:
> +      properties:
> +        '#access-controller-cells': true
> +    else:
> +      properties:
> +        '#access-controller-cells': false
> +
>  additionalProperties: false
>  
>  examples:
> -- 
> 2.50.1
>