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: <e3da08df-a5cb-3fbd-2356-64416f48c073@linaro.org>
Date:   Tue, 7 Mar 2023 16:51:51 +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 07/03/2023 11:30, Walker Chen wrote:
> 
> 
> 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.

Rebasing on old kernel was referring to syntax of other binding? I don't
understand this. How old code which you copied is related anyhow to
other binding? You are expected to send patches always based on recent
one, not something old.

> 
>>
>>> +  - 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 ?

Yes, because order of the items is fixed.



Best regards,
Krzysztof