Message-ID: <4ce14e3c.bf79.18377f44118.Coremail.zhuyinbo@loongson.cn>
Date:   Mon, 26 Sep 2022 12:00:39 +0800 (GMT+08:00)
From:   "Yinbo Zhu" <zhuyinbo@...ngson.cn>
To:     "Rob Herring" <robh@...nel.org>
Cc:     "Krzysztof Kozlowski" <krzysztof.kozlowski@...aro.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        "Daniel Lezcano" <daniel.lezcano@...aro.org>,
        "Amit Kucheria" <amitk@...nel.org>,
        "Zhang Rui" <rui.zhang@...el.com>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        zhanghongchen <zhanghongchen@...ngson.cn>,
        "Yinbo Zhu" <zhuyinbo@...ngson.cn>,
        刘佩宝 <liupeibao@...ngson.cn>
Subject: Re: Re: Re: [PATCH v2 2/3] dt-bindings: thermal: Convert loongson2
 to json-schema




> -----原始邮件-----
> 发件人: "Rob Herring" <robh@...nel.org>
> 发送时间:2022-09-25 01:42:58 (星期日)
> 收件人: "朱银波" <zhuyinbo@...ngson.cn>
> 抄送: "Krzysztof Kozlowski" <krzysztof.kozlowski@...aro.org>, "Rafael J . Wysocki" <rafael@...nel.org>, "Daniel Lezcano" <daniel.lezcano@...aro.org>, "Amit Kucheria" <amitk@...nel.org>, "Zhang Rui" <rui.zhang@...el.com>, linux-pm@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, zhanghongchen <zhanghongchen@...ngson.cn>
> 主题: Re: Re: [PATCH v2 2/3] dt-bindings: thermal: Convert loongson2 to json-schema
> 
> On Thu, Sep 22, 2022 at 09:39:30AM +0800, 朱银波 wrote:
> > 
> > 
> > 
> > > -----原始邮件-----
> > > 发件人: "Krzysztof Kozlowski" <krzysztof.kozlowski@...aro.org>
> > > 发送时间:2022-09-21 17:31:11 (星期三)
> > > 收件人: "朱银波" <zhuyinbo@...ngson.cn>
> > > 抄送: "Rafael J . Wysocki" <rafael@...nel.org>, "Daniel Lezcano" <daniel.lezcano@...aro.org>, "Amit Kucheria" <amitk@...nel.org>, "Zhang Rui" <rui.zhang@...el.com>, linux-pm@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, zhanghongchen <zhanghongchen@...ngson.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@...aro.org>
> > > >> 发送时间:2022-09-21 15:05:00 (星期三)
> > > >> 收件人: "Yinbo Zhu" <zhuyinbo@...ngson.cn>, "Rafael J . Wysocki" <rafael@...nel.org>, "Daniel Lezcano" <daniel.lezcano@...aro.org>, "Amit Kucheria" <amitk@...nel.org>, "Zhang Rui" <rui.zhang@...el.com>, "Rob Herring" <robh+dt@...nel.org>, "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>, linux-pm@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
> > > >> 抄送: zhanghongchen <zhanghongchen@...ngson.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@...ngson.cn>
> > > >>> +  - Yinbo Zhu <zhuyinbo@...ngson.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
> 
> Differences in SoCs is what 'compatible' is for. If 'loongson2' is not a 
> specific SoC, then your compatible string is not specific enough.
If other loongson2 platforms are different from the thermal sensor, I will add compatible
"loongson,loongson2-thermal-xxx", please you note.

> 
> > > 
> > > >>
> > > >>> +    description: |
> > > >>> +      Specify the thermal sensor id.
> > > >>> +    minimum: 0
> > > >>> +    maximum: 3
> > > >>> +
> > > >>> +  interrupts:
> > > >>> +    maxItems: 1
> > > >>> +
> > > >>> +  "#thermal-sensor-cells":
> > > >>> +    const: 1
> 
> If one SoC only has 1 sensor, then this could be 0. However, you don't 
> have to do that, but it's another way to distinguish differences.
okay ,I got it.
> 
> > > >>> +
> > > >>> +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.
> 
> It is perfectly valid for the 'interrupt-parent' to be in *any* parent 
> node. So it is never required by any binding.
I don't get your meaning, You mean I can add it in the dts, but I don't need to add it in the binding file, right?
> 
> Rob


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