linux-kernel - Re: [PATCH v11 1/2] dt-bindings: spi: add loongson spi

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Message-ID: <69d355ff-90e1-09d2-d4ff-0d7dedc8addb@linaro.org>
Date:   Wed, 31 May 2023 22:06:10 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     zhuyinbo <zhuyinbo@...ngson.cn>,
        Conor Dooley <conor.dooley@...rochip.com>
Cc:     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, Jianmin Lv <lvjianmin@...ngson.cn>,
        wanghongliang@...ngson.cn, Liu Peibao <liupeibao@...ngson.cn>,
        loongson-kernel@...ts.loongnix.cn
Subject: Re: [PATCH v11 1/2] dt-bindings: spi: add loongson spi

On 25/05/2023 04:22, zhuyinbo wrote:
> 
> 
> 在 2023/5/24 下午6:29, Conor Dooley 写道:
>> On Wed, May 24, 2023 at 05:44:38PM +0800, zhuyinbo wrote:
>>>
>>>
>>> 在 2023/5/24 下午4:56, Conor Dooley 写道:
>>>> On Mon, May 22, 2023 at 03:10:29PM +0800, Yinbo Zhu wrote:
>>>>> Add the Loongson platform spi binding with DT schema format using
>>>>> json-schema.
>>>>>
>>>>> Signed-off-by: Yinbo Zhu <zhuyinbo@...ngson.cn>
>>>>> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>>>>> ---
>>>>>    .../bindings/spi/loongson,ls2k-spi.yaml       | 41 +++++++++++++++++++
>>>>>    MAINTAINERS                                   |  6 +++
>>>>>    2 files changed, 47 insertions(+)
>>>>>    create mode 100644 Documentation/devicetree/bindings/spi/loongson,ls2k-spi.yaml
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/spi/loongson,ls2k-spi.yaml b/Documentation/devicetree/bindings/spi/loongson,ls2k-spi.yaml
>>>>> new file mode 100644
>>>>> index 000000000000..d0be6e5378d7
>>>>> --- /dev/null
>>>>> +++ b/Documentation/devicetree/bindings/spi/loongson,ls2k-spi.yaml
>>>>> @@ -0,0 +1,41 @@
>>>>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>>>>> +%YAML 1.2
>>>>> +---
>>>>> +$id: http://devicetree.org/schemas/spi/loongson,ls2k-spi.yaml#
>>>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>>>> +
>>>>> +title: Loongson SPI controller
>>>>> +
>>>>> +maintainers:
>>>>> +  - Yinbo Zhu <zhuyinbo@...ngson.cn>
>>>>> +
>>>>> +allOf:
>>>>> +  - $ref: /schemas/spi/spi-controller.yaml#
>>>>> +
>>>>> +properties:
>>>>> +  compatible:
>>>>> +    enum:
>>>>> +      - loongson,ls2k-spi
>>>>
>>>> I am sorry to jump in here at such a late stage with a (potentially)
>>>> trivial question. "ls2k" is the SoC family rather than a specific model
>>>> as far as I understand.
>>>> The answer is probably yes, but do all SoCs in the family have an
>>>> identical version of the IP?
>>>
>>>
>>> No, but the spi supported by this loongson spi driver are all the same
>>> identical version, and other type or verion spi will be supported as
>>> needed in the future.
>>
>> Does having a catch-all compatible make sense then when not all SoCs in
>> the ls2k family will actually be able to use this driver?
> 
> 
> Yes, it is make sense as it can reduce the workload of the community.

I missed it - that's a great comment. Hm, I don't know... Reviewing
Loongson patches is quite a work, so I don't see here reduced workload.

Please read existing guidelines:
https://elixir.bootlin.com/linux/v6.1-rc1/source/Documentation/devicetree/bindings/writing-bindings.rst

All of them.

Best regards,
Krzysztof