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Message-ID: <0d2fce98-6744-69af-44a2-702f4927b626@linaro.org>
Date:   Thu, 22 Sep 2022 08:25:59 +0200
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Subject: Re: [PATCH v2 2/3] dt-bindings: thermal: Convert loongson2 to
 json-schema
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To:     =?UTF-8?B?5pyx6ZO25rOi?= <zhuyinbo@loongson.cn>
Cc:     "Rafael J . Wysocki" <rafael@kernel.org>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Amit Kucheria <amitk@kernel.org>,
        Zhang Rui <rui.zhang@intel.com>, linux-pm@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        zhanghongchen <zhanghongchen@loongson.cn>
References: <20220921015605.17078-1-zhuyinbo@loongson.cn>
 <20220921015605.17078-2-zhuyinbo@loongson.cn>
 <fb901889-d769-ba56-d4cb-2d9d8b50f74f@linaro.org>
 <28a78a10.a7dd.1835f5aaf90.Coremail.zhuyinbo@loongson.cn>
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 <4febe7e4.a96c.18362d997e3.Coremail.zhuyinbo@loongson.cn>
From:   Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
In-Reply-To: <4febe7e4.a96c.18362d997e3.Coremail.zhuyinbo@loongson.cn>
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On 22/09/2022 03:39, 朱银波 wrote:
> 
> 
> 
>> -----原始邮件-----
>> 发件人: "Krzysztof Kozlowski" <krzysztof.kozlowski@linaro.org>
>> 发送时间:2022-09-21 17:31:11 (星期三)
>> 收件人: "朱银波" <zhuyinbo@loongson.cn>
>> 抄送: "Rafael J . Wysocki" <rafael@kernel.org>, "Daniel Lezcano" <daniel.lezcano@linaro.org>, "Amit Kucheria" <amitk@kernel.org>, "Zhang Rui" <rui.zhang@intel.com>, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, zhanghongchen <zhanghongchen@loongson.cn>
>> 主题: Re: [PATCH v2 2/3] dt-bindings: thermal: Convert loongson2 to json-schema
>>
>> On 21/09/2022 11:22, 朱银波 wrote:
>>>> -----原始邮件-----
>>>> 发件人: "Krzysztof Kozlowski" <krzysztof.kozlowski@linaro.org>
>>>> 发送时间:2022-09-21 15:05:00 (星期三)
>>>> 收件人: "Yinbo Zhu" <zhuyinbo@loongson.cn>, "Rafael J . Wysocki" <rafael@kernel.org>, "Daniel Lezcano" <daniel.lezcano@linaro.org>, "Amit Kucheria" <amitk@kernel.org>, "Zhang Rui" <rui.zhang@intel.com>, "Rob Herring" <robh+dt@kernel.org>, "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@linaro.org>, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
>>>> 抄送: zhanghongchen <zhanghongchen@loongson.cn>
>>>> 主题: Re: [PATCH v2 2/3] dt-bindings: thermal: Convert loongson2 to json-schema
>>>>
>>>> On 21/09/2022 03:56, Yinbo Zhu wrote:
>>>>> Convert the loongson2 thermal binding to DT schema format using
>>>>> json-schema.
>>>>
>>>> Incorrect subject and incorrect commit msg. There is no conversion here.
>>> Our soc architecture is the loongson2 series, so we will modify it accordingly.
>>
>> How the soc architecture is related to my comment that you do not
>> perform conversion?
> I got it, and I will aad a conversion.
>>
>>>
>>>>
>>>>>
>>>>> Signed-off-by: Yinbo Zhu <c>
>>>>> ---
>>>>> Change in v2:
>>>>> 		1. Add description and type about the "id".	
>>>>> 		2. Make the filename was based on compatible.
>>>>>
>>>>>  .../bindings/thermal/loongson2-thermal.yaml   | 52 +++++++++++++++++++
>>>>>  1 file changed, 52 insertions(+)
>>>>>  create mode 100644 Documentation/devicetree/bindings/thermal/loongson2-thermal.yaml
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/thermal/loongson2-thermal.yaml b/Documentation/devicetree/bindings/thermal/loongson2-thermal.yaml
>>>>> new file mode 100644
>>>>> index 000000000000..2994ae3a56aa
>>>>> --- /dev/null
>>>>> +++ b/Documentation/devicetree/bindings/thermal/loongson2-thermal.yaml
>>>>
>>>>
>>>> No improvements here. You ignore my comments, so I am going to NAK it.
>>> I don't get your point, that dts compatible is "loongson,loongson2-thermal", so this driver file name is named
>>> loongson2-thermal that according what you said about "Filename based on compatible."
>>> If what I understand is not what you expect, please tell me how to modify it.
>>
>>
>> Filename must match the compatible, so: loongson,loongson2-thermal.yaml
> I got it, and I will add a conversion.
>>
>>>>
>>>>
>>>>> @@ -0,0 +1,52 @@
>>>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>>>> +%YAML 1.2
>>>>> +---
>>>>> +$id: http://devicetree.org/schemas/thermal/loongson2-thermal.yaml#
>>>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>>>> +
>>>>> +title: Thermal sensors on loongson2 SoCs
>>>>> +
>>>>> +maintainers:
>>>>> +  - zhanghongchen <zhanghongchen@loongson.cn>
>>>>> +  - Yinbo Zhu <zhuyinbo@loongson.cn>
>>>>> +
>>>>> +properties:
>>>>> +  compatible:
>>>>> +    const: loongson,loongson2-thermal
>>>>> +
>>>>> +  reg:
>>>>> +    maxItems: 1
>>>>> +
>>>>> +  id:
>>>>> +    $ref: '//schemas/types.yaml#/definitions/uint32'
>>>>
>>>> No improvements here, so let me be specific - you need to really justify
>>>> such property or it cannot go to schema.
>>> The loongson2_thermal.c driver need parse this "id" property.
>>
>> This is not reason to add properties to DT. DT describes the hardware,
>> not driver behavior.
>>
>> Why hardware needs arbitrary, additional addressing number instead of
>> standard unit address?
> The loongson2 series soc supports up to four sensors, but the 2K1000 has only one sensor, so the ID must be 0. 
> For the 2K1000, in order to distinguish the differences between different hardware in the Loongson2 SoC series,
> the ID is added to the dts

That's not an explanation at all. All other SoCs have multiple sensors
and we do not have such "id" fields.

>>
>>>>
>>>>> +    description: |
>>>>> +      Specify the thermal sensor id.
>>>>> +    minimum: 0
>>>>> +    maximum: 3
>>>>> +
>>>>> +  interrupts:
>>>>> +    maxItems: 1
>>>>> +
>>>>> +  "#thermal-sensor-cells":
>>>>> +    const: 1
>>>>> +
>>>>> +required:
>>>>> +  - compatible
>>>>> +  - reg
>>>>> +  - id
>>>>> +  - interrupt-parent
>>>>
>>>> Why?
>>> The interrupts of our dts do not specify an interrupt parent,
>>> eg. interrupts = <7 IRQ_TYPE_LEVEL_LOW>
>>> so we need to add an interrupt parent property.
>>
>> You can add but I am asking why is it required?
> Since there is more than one interrupt controller in the Loongson2 series soc, that need to specify the interrupt 
> controller in the dts, that is, the interrupt parent.   If different interrupt parents are used in dts, the interrupt 
> numbers are different.

You describe now the overall SoC, but this is a schema for a device, not
entire SoC. I still do not see why interrupt-parent is necessary for
this device.

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You keep ignoring this one.

Best regards,
Krzysztof