linux-kernel - Re: [PATCH v3 1/3] dt-bindings: qspi: cdns,qspi-nor: Add clocks for StarFive JH7110 SoC

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Date:   Wed, 21 Jun 2023 10:10:49 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     William Qiu <william.qiu@...rfivetech.com>,
        devicetree@...r.kernel.org, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Cc:     Mark Brown <broonie@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Emil Renner Berthing <kernel@...il.dk>,
        Ziv Xu <ziv.xu@...rfivetech.com>
Subject: Re: [PATCH v3 1/3] dt-bindings: qspi: cdns,qspi-nor: Add clocks for
 StarFive JH7110 SoC

On 21/06/2023 08:45, William Qiu wrote:
> 
> 
> On 2023/6/19 20:17, Krzysztof Kozlowski wrote:
>> On 19/06/2023 10:35, William Qiu wrote:
>>> The QSPI controller needs three clock items to work properly on StarFive
>>> JH7110 SoC, so there is need to change the maxItems's value to 3. Other
>>> platforms do not have this constraint.
>>>
>>> Signed-off-by: William Qiu <william.qiu@...rfivetech.com>
>>> Reviewed-by: Hal Feng <hal.feng@...rfivetech.com>
>>> Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
>>> ---
>>>  .../bindings/spi/cdns,qspi-nor.yaml           | 20 ++++++++++++++++++-
>>>  1 file changed, 19 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/Documentation/devicetree/bindings/spi/cdns,qspi-nor.yaml b/Documentation/devicetree/bindings/spi/cdns,qspi-nor.yaml
>>> index b310069762dd..1b83cbb9a086 100644
>>> --- a/Documentation/devicetree/bindings/spi/cdns,qspi-nor.yaml
>>> +++ b/Documentation/devicetree/bindings/spi/cdns,qspi-nor.yaml
>>> @@ -26,6 +26,15 @@ allOf:
>>>              const: starfive,jh7110-qspi
>>>      then:
>>>        properties:
>>> +        clocks:
>>> +          maxItems: 3
>>> +
>>> +        clock-names:
>>> +          items:
>>> +            - const: ref
>>> +            - const: ahb
>>> +            - const: apb
>>
>> You are duplicating top-level property. Define the items only in one
>> place. If this list is applicable to everything, then in top-level property.
>>
> Only in JH7110 SoC need there clocks, other platforms do not have this constraint.
> So I need to duplicating top-level property.

You don't need, why? Why writing something twice is an answer to "JH7110
needs 3 clocks"? It's not related.

What is the clock for all other variants?

>>> +
>>>          resets:
>>>            minItems: 2
>>>            maxItems: 3
>>> @@ -38,6 +47,9 @@ allOf:
>>>  
>>>      else:
>>>        properties:
>>> +        clocks:
>>> +          maxItems: 1
>>
>> clock-names is missing. They must be in sync with clocks. What is the
>> first clock?
>>
> But there are no clock-names before, should I add it?

Then let's just disallow it. Either you define it or you not allow it.

>>> +
>>>          resets:
>>>            maxItems: 2
>>>  
>>> @@ -70,7 +82,13 @@ properties:
>>>      maxItems: 1
>>>  
>>>    clocks:
>>> -    maxItems: 1
>>> +    maxItems: 3
>>
>>
>> You did not test it before sending. minItems is missing.
>>
> I will add it.
> As for other platforms, should I use enum to constraint the clocks?

What is the clock on other platforms?

Best regards,
Krzysztof