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

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Date:   Thu, 8 Jun 2023 12:02:57 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     zhuyinbo <zhuyinbo@...ngson.cn>, 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
Subject: Re: [PATCH v12 1/2] spi: add loongson spi bindings

On 08/06/2023 12:00, zhuyinbo wrote:
> 
> 
> 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.

Don't you refer now to drivers? Because how hardware can not support
clocks if it has them? How CCF is anyhow related to hardware?

> 
>>
>>>
>>>>
>>>>> @@ -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

We do not discuss here drivers, but bindings. Whatever your drivers are
not supporting, matters less.

> 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.

Not related to bindings...

Best regards,
Krzysztof