linux-kernel - Re: [PATCH v4 1/3] dt-bindings: dma: snps,dw-axi-dmac: constrain resets items for JH7110 dma

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Message-ID: <b2b36909-b0b1-7507-3145-141eb5ec0f3f@linaro.org>
Date:   Tue, 7 Mar 2023 10:03:52 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Walker Chen <walker.chen@...rfivetech.com>,
        Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
        Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Emil Renner Berthing <emil.renner.berthing@...onical.com>
Cc:     dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v4 1/3] dt-bindings: dma: snps,dw-axi-dmac: constrain
 resets items for JH7110 dma

On 06/03/2023 15:04, Walker Chen wrote:
> The DMA controller needs two reset items to work properly on JH7110 SoC,
> so there is need to constrain the items' value to 2, other platforms
> have 1 reset item at most.
> 
> Signed-off-by: Walker Chen <walker.chen@...rfivetech.com>
> ---
>  .../bindings/dma/snps,dw-axi-dmac.yaml        | 24 +++++++++++++++----
>  1 file changed, 20 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml b/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
> index ad107a4d3b33..d8b5439f215c 100644
> --- a/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
> +++ b/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml
> @@ -12,14 +12,12 @@ maintainers:
>  description:
>    Synopsys DesignWare AXI DMA Controller DT Binding
>  
> -allOf:
> -  - $ref: "dma-controller.yaml#"
> -
>  properties:
>    compatible:
>      enum:
>        - snps,axi-dma-1.01a
>        - intel,kmb-axi-dma
> +      - starfive,jh7110-axi-dma
>  
>    reg:
>      minItems: 1
> @@ -58,7 +56,8 @@ properties:
>      maximum: 8
>  
>    resets:
> -    maxItems: 1
> +    minItems: 1
> +    maxItems: 2
>  
>    snps,dma-masters:
>      description: |
> @@ -109,6 +108,23 @@ required:
>    - snps,priority
>    - snps,block-size
>  
> +allOf:
> +  - $ref: "dma-controller.yaml#"

Rebase your patches on something recent... I would argue that it should
be based on maintainer's (or linux-next) tree, but that would be too
good to be true.

> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - starfive,jh7110-axi-dma
> +    then:
> +      properties:
> +        resets:
> +          minItems: 2

What are the items expected here?

> +    else:
> +      properties:
> +        resets:

Best regards,
Krzysztof