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

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Date:   Thu, 8 Jun 2023 18:00:36 +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 2023/6/8 下午4:53, Krzysztof Kozlowski 写道:
> On 08/06/2023 10:39, zhuyinbo wrote:
>>>>
>>>> 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..423ee851edd5
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/spi/loongson,ls2k-spi.yaml
>>>
>>> Filename based on compatible.
>>
>>
>> There will be more ls2k series SoC spi device in the future thus I still
>> use "loongson,ls2k-spi.yaml" for cover it.
> 
> Add them now.


The 2k0500 doesn't support CCF and not use CCF to gain clock and We
internally tend to prioritize supporting 2k1000.

> 
>>
>>>
>>>> @@ -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,ls2k1000-spi
>>>
>>> No compatibles for other devices? Didn't we have big discussion about this?
>>>
>>> https://elixir.bootlin.com/linux/v6.1-rc1/source/Documentation/devicetree/bindings/writing-bindings.rst#L42
>>
>>
>> There are other ls2k SPI devices compatible, such as,
>> "loongson,ls2k0500-spi", "loongson,ls2k2000-spi" but currently I plan to
>> add ls2k1000 spi device first, Other ls2k SoC spi device adaptation may
>> require some additional work and I will add it later.
> 
> Previously you claimed this serves entire family, so I don't understand
> why you need to fix something. Why previously it was working for entire
> family but now it does not?


It can work was for ls2k1000 and ls2k0500 and it specifically refers to
spi driver. but 2k0500 doesn't implementing a clock driver and doesn't
use CCF to gain clock but can use "clock-frequency".  Is it necessary to
obtain a clock based on CCF? If it's necessary, then it seems that it
can only added 2k1000 spi first.

Thanks,
Yinbo