linux-kernel - Re: [PATCH v1 01/13] dt-bindings: power: mediatek: Document mediatek,bus-protection

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Message-ID: <20250627201543.GA4171766-robh@kernel.org>
Date: Fri, 27 Jun 2025 15:15:43 -0500
From: Rob Herring <robh@...nel.org>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: linux-mediatek@...ts.infradead.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, matthias.bgg@...il.com, ulf.hansson@...aro.org,
	y.oudjana@...tonmail.com, fshao@...omium.org, wenst@...omium.org,
	lihongbo22@...wei.com, mandyjh.liu@...iatek.com, mbrugger@...e.com,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org,
	kernel@...labora.com
Subject: Re: [PATCH v1 01/13] dt-bindings: power: mediatek: Document
 mediatek,bus-protection

On Mon, Jun 23, 2025 at 02:01:42PM +0200, AngeloGioacchino Del Regno wrote:
> Add a new mediatek,bus-protection property in the main power
> controller node and deprecate the old mediatek,infracfg,
> mediatek,infracfg-nao and mediatek,smi properties located in
> the children.
> 
> This is done in order to both simplify the power controller
> nodes and in preparation for adding support for new generation
> SoCs like MT8196/MT6991 and other variants, which will need
> to set protection on new busses.

Protection like access controls? We have the access-controller binding 
for that.

> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
>  .../power/mediatek,power-controller.yaml      | 40 +++++++++++++++++++
>  1 file changed, 40 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/power/mediatek,power-controller.yaml b/Documentation/devicetree/bindings/power/mediatek,power-controller.yaml
> index 9c7cc632abee..2530c873bb3c 100644
> --- a/Documentation/devicetree/bindings/power/mediatek,power-controller.yaml
> +++ b/Documentation/devicetree/bindings/power/mediatek,power-controller.yaml
> @@ -44,6 +44,18 @@ properties:
>    '#size-cells':
>      const: 0
>  
> +  mediatek,bus-protection:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +    description:
> +      A number of phandles to external blocks to set and clear the required
> +      bits to enable or disable bus protection, necessary to avoid any bus
> +      faults while enabling or disabling a power domain.
> +      For example, this may hold phandles to INFRACFG and SMI.
> +    minItems: 1
> +    maxItems: 3
> +    items:
> +      maxItems: 1
> +
>  patternProperties:
>    "^power-domain@[0-9a-f]+$":
>      $ref: "#/$defs/power-domain-node"
> @@ -123,14 +135,17 @@ $defs:
>        mediatek,infracfg:
>          $ref: /schemas/types.yaml#/definitions/phandle
>          description: phandle to the device containing the INFRACFG register range.
> +        deprecated: true
>  
>        mediatek,infracfg-nao:
>          $ref: /schemas/types.yaml#/definitions/phandle
>          description: phandle to the device containing the INFRACFG-NAO register range.
> +        deprecated: true
>  
>        mediatek,smi:
>          $ref: /schemas/types.yaml#/definitions/phandle
>          description: phandle to the device containing the SMI register range.
> +        deprecated: true
>  
>      required:
>        - reg
> @@ -138,6 +153,31 @@ $defs:
>  required:
>    - compatible
>  
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - mediatek,mt8183-power-controller
> +    then:
> +      properties:
> +        mediatek,bus-protection:
> +          minItems: 2
> +          maxItems: 2
> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - mediatek,mt8365-power-controller
> +    then:
> +      properties:
> +        mediatek,bus-protection:
> +          minItems: 3
> +          maxItems: 3
> +
>  additionalProperties: false
>  
>  examples:
> -- 
> 2.49.0
>