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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Message-ID: <1a696768-45ef-0144-07f3-d356af9659e5@linaro.org>
Date:   Tue, 20 Dec 2022 10:21:49 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     yanhong wang <yanhong.wang@...rfivetech.com>,
        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 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

> 
>> Best regards,
>> Krzysztof
>>

Best regards,
Krzysztof