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

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Date:   Tue, 7 Mar 2023 18:30:09 +0800
From:   Walker Chen <walker.chen@...rfivetech.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        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 2023/3/7 17:03, Krzysztof Kozlowski wrote:
> 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.

This was written by referring to the syntax of other dt-binding, but your suggestion 
is a good one, the next version of patches will be rebased on kernel 6.3.

> 
>> +  - if:
>> +      properties:
>> +        compatible:
>> +          contains:
>> +            enum:
>> +              - starfive,jh7110-axi-dma
>> +    then:
>> +      properties:
>> +        resets:
>> +          minItems: 2
> 
> What are the items expected here?

Do you mean to add descriptions for items here ?

Thanks!

Best regards,
Walker