linux-kernel - Re: [PATCH v2 2/9] dt-bindings: net: snps,dwmac: Update the maxitems number of resets and reset-names

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Date:   Tue, 27 Dec 2022 15:48:18 +0800
From:   yanhong wang <yanhong.wang@...rfivetech.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        <linux-riscv@...ts.infradead.org>, <netdev@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Emil Renner Berthing <kernel@...il.dk>,
        Richard Cochran <richardcochran@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Peter Geis <pgwipeout@...il.com>
Subject: Re: [PATCH v2 2/9] dt-bindings: net: snps,dwmac: Update the maxitems
 number of resets and reset-names



On 2022/12/20 17:21, Krzysztof Kozlowski wrote:
> On 20/12/2022 07:48, yanhong wang wrote:
> 
>>>> diff --git a/Documentation/devicetree/bindings/net/snps,dwmac.yaml b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
>>>> index e26c3e76ebb7..7870228b4cd3 100644
>>>> --- a/Documentation/devicetree/bindings/net/snps,dwmac.yaml
>>>> +++ b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
>>>> @@ -133,12 +133,19 @@ properties:
>>>>          - ptp_ref
>>>>  
>>>>    resets:
>>>> -    maxItems: 1
>>>> -    description:
>>>> -      MAC Reset signal.
>>>> +    minItems: 1
>>>> +    maxItems: 3
>>>> +    additionalItems: true
>>>> +    items:
>>>> +      - description: MAC Reset signal
>>>>  
>>>>    reset-names:
>>>> -    const: stmmaceth
>>>> +    minItems: 1
>>>> +    maxItems: 3
>>>> +    additionalItems: true
>>>> +    contains:
>>>> +      enum:
>>>> +        - stmmaceth
>>>
>>> No, this is highly unspecific and you know affect all the schemas using
>>> snps,dwmac.yaml. Both lists must be specific - for your device and for
>>> others.
>>>
>> 
>> I have tried to define the resets in "starfive,jh71x0-dwmac.yaml", but it can not over-write the maxItems limit in "snps,dwmac.yaml",therefore, it will report error "reset-names: ['stmmaceth', 'ahb'] is too long"  running "make dt_binding_check". Do you have any suggestions to deal with this situation?
> 
> The solution is not to affect all schemas with allowing anything as reset.
> 
> If you need more items for your case, you can change snps,dwmac.yaml and
> add constraints in allOf:if:then: allowing it only for your compatible.
> There are plenty of examples how this is done, e.g.:
> 
> https://elixir.bootlin.com/linux/v5.19-rc6/source/Documentation/devicetree/bindings/clock/samsung,exynos7-clock.yaml#L57
> 

Thanks. Refer to the definition in the example and update the definition as follows:

snps,dwmac.yaml[Partial Content]:

properties:
  resets:
    maxItems: 1
    description:
      MAC Reset signal.

  reset-names:
    const: stmmaceth

allOf:
  - if:
      properties:
        compatible:
          contains:
            const: starfive,jh7110-dwmac

    then:
      properties:
        resets:
          minItems: 2
          maxItems: 2
        reset-names:
          items:
            - const: stmmaceth
            - const: ahb
      required:
        - resets
        - reset-names


starfive,jh7110-dwmac.yaml[Partial Content]:

properties:
  resets:
    items:
      - description: MAC Reset signal.
      - description: AHB Reset signal.

  reset-names:
    items:
      - const: stmmaceth
      - const: ahb

allOf:
  - $ref: snps,dwmac.yaml#

It will also report error "reset-names: ['stmmaceth', 'ahb'] is too long"  running "make dt_binding_check" with 'starfive,jh7110-dwmac.yaml'. Do you have any better suggestions to solve this problem?

>> 
>>> Best regards,
>>> Krzysztof
>>>
> 
> Best regards,
> Krzysztof
>