[PATCH v4 1/1] dt-bindings: remoteproc: mtk,scp: Allow multiple memory regions for MT8188

[Conor Dooley]

On Wed, May 20, 2026 at 07:26:29PM +0800, Arnab Layek wrote:
> The MT8188 SCP can use either one or two reserved memory regions:
> - Required: Main SCP SRAM memory region (mandatory for SCP operation)
> - Optional: SCP L1TCM memory region (Level 1 Tightly Coupled Memory,
>   used for performance optimization when available, but not required
>   for basic SCP functionality)
> 
> Other MediaTek SoCs (MT8183, MT8186, MT8192, MT8195) use only a single
> memory region and must remain restricted to one region for backward
> compatibility.
> 
> Update the base schema to allow 1-2 memory regions (minItems: 1,
> maxItems: 2), following the pattern used by other MediaTek dt-bindings
> like mediatek,vcodec-encoder.yaml where the base property defines a
> permissive range accommodating all device variants.
> 
> Add two conditionals:
> 1. Explicitly restrict non-MT8188 devices to maxItems: 1
> 2. Document MT8188's two regions with descriptions (minItems: 1 makes
>    the L1TCM region optional, allowing boards to specify 1-2 regions
>    based on hardware configuration)
> 
> This approach maintains backward compatibility while enabling MT8188 to
> specify 1-2 memory regions depending on board design and performance
> requirements.
> 
> Signed-off-by: Arnab Layek <arnab.layek at mediatek.com>

Acked-by: Conor Dooley <conor.dooley at microchip.com>
pw-bot: not-applicable

Cheers,
Conor.

> ---
>  .../bindings/remoteproc/mtk,scp.yaml          | 45 ++++++++++++++++++-
>  1 file changed, 43 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml b/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml
> index bdbb12118da4..fca9b0675eae 100644
> --- a/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml
> +++ b/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml
> @@ -55,7 +55,8 @@ properties:
>        initializing SCP.
>  
>    memory-region:
> -    maxItems: 1
> +    minItems: 1
> +    maxItems: 2
>  
>    cros-ec-rpmsg:
>      $ref: /schemas/embedded-controller/google,cros-ec.yaml
> @@ -123,7 +124,8 @@ patternProperties:
>            initializing sub cores of multi-core SCP.
>  
>        memory-region:
> -        maxItems: 1
> +        minItems: 1
> +        maxItems: 2
>  
>        cros-ec-rpmsg:
>          $ref: /schemas/embedded-controller/google,cros-ec.yaml
> @@ -205,6 +207,45 @@ allOf:
>            items:
>              - const: cfg
>              - const: l1tcm
> +  - if:
> +      properties:
> +        compatible:
> +          enum:
> +            - mediatek,mt8183-scp
> +            - mediatek,mt8186-scp
> +            - mediatek,mt8192-scp
> +            - mediatek,mt8195-scp
> +            - mediatek,mt8195-scp-dual
> +    then:
> +      properties:
> +        memory-region:
> +          maxItems: 1
> +      patternProperties:
> +        "^scp@[a-f0-9]+$":
> +          properties:
> +            memory-region:
> +              maxItems: 1
> +  - if:
> +      properties:
> +        compatible:
> +          enum:
> +            - mediatek,mt8188-scp
> +            - mediatek,mt8188-scp-dual
> +    then:
> +      properties:
> +        memory-region:
> +          minItems: 1
> +          items:
> +            - description: Main SCP SRAM memory region
> +            - description: Optional SCP L1TCM memory region
> +      patternProperties:
> +        "^scp@[a-f0-9]+$":
> +          properties:
> +            memory-region:
> +              minItems: 1
> +              items:
> +                - description: Main SCP SRAM memory region
> +                - description: Optional SCP L1TCM memory region
>  
>  additionalProperties: false
>  
> -- 
> 2.45.2
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