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:   Wed, 8 Mar 2023 09:08:33 +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 23:51, Krzysztof Kozlowski wrote:
> 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.

Okay, I understand what you mean.

> 
>> 
>>>
>>>> +  - 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.

Thanks!

Best regards,
Walker