linux-kernel - Re: [PATCH v12 1/2] spi: add loongson spi bindings

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Date:   Tue, 13 Jun 2023 10:04:48 +0800
From:   zhuyinbo <zhuyinbo@...ngson.cn>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-spi@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Jianmin Lv <lvjianmin@...ngson.cn>, wanghongliang@...ngson.cn,
        Liu Peibao <liupeibao@...ngson.cn>,
        loongson-kernel@...ts.loongnix.cn, zhuyinbo@...ngson.cn
Subject: Re: [PATCH v12 1/2] spi: add loongson spi bindings



在 2023/6/13 上午2:03, Krzysztof Kozlowski 写道:
> On 12/06/2023 13:29, zhuyinbo wrote:
>>
>>
>> 在 2023/6/12 下午4:16, Krzysztof Kozlowski 写道:
>>>>>>>>>> 在 2023/6/8 下午7:45, Krzysztof Kozlowski 写道:
>>>>>>>>>>> On 08/06/2023 13:42, zhuyinbo wrote:
>>>>>>>>>>>> --- a/Documentation/devicetree/bindings/spi/loongson,ls2k-spi.yaml
>>>>>>>>>>>> +++ b/Documentation/devicetree/bindings/spi/loongson,ls2k-spi.yaml
>>>>>>>>>>>> @@ -16,6 +16,7 @@ properties:
>>>>>>>>>>>>           compatible:
>>>>>>>>>>>>             enum:
>>>>>>>>>>>>               - loongson,ls2k1000-spi
>>>>>>>>>>>> +      - loongson,ls2k0500-spi
>>>>>>>>>>>
>>>>>>>>>>> Aren't they compatible?
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Are you saying that the spi driver is compatible with 2k0500 ?
>>>>>>>>>
>>>>>>>>> Didn't you say this through 11 previous revisions?
>>>>>>>>
>>>>>>>>
>>>>>>>> Yes, did I understand your meaning incorrectly ?
>>>>>>>
>>>>>>> If they are compatible, then they are not part of one enum. They could
>>>>>>> not be as this would easily fail in testing of your DTS.
>>>>>>>
>>>>>>
>>>>>>
>>>>>> The "loongson,ls2k0500-spi" wasn't a compatible in previous version and
>>>>>> I will add "loongson,ls2k0500-spi" as a compatible in spi driver and
>>>>>> added it as a part of the one enum in dt-binding.
>>>>>
>>>>> No, because you claimed - if I understood correctly - that they are
>>>>> compatible. Don't add fake entries to the driver.
>>>>>
>>>>
>>>>
>>>> I'm a bit confused, and I just need to add 'loongson,ls2k0500-spi' as
>>>> one enum in dt-bindings, but driver don't add this entry ?
>>>
>>> Compatibility is expressed with a list:
>>> https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#compatible
>>> so it cannot be just one enum, but "items". There are hundreds of
>>> examples including example-schema.
>>
>>
>> Is it a description like the following?
>>
>>    properties:
>>      compatible:
>> -    enum:
>> -      - loongson,ls2k1000-spi
>> +    oneOf:
>> +      - enum:
>> +          - loongson,ls2k1000-spi
>> +      - items:
>> +          - enum:
>> +              - loongson,ls2k1000-spi
>> +          - const: loongson,ls2k1000-spi
> 
> Remove this items part - it does not make sense. Device is not
> compatible with itself. Rest looks ok.


okay, I got it.

Thanks,
Yinbo