linux-kernel - Re: [PATCH 14/39] arm64: dts: qcom: sdm630: Add TSENS node

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Message-ID: <b16d8000-85a7-d957-77d2-d921e5b09829@somainline.org>
Date:   Thu, 29 Jul 2021 12:55:37 +0200
From:   Konrad Dybcio <konrad.dybcio@...ainline.org>
To:     Thara Gopinath <thara.gopinath@...aro.org>,
        ~postmarketos/upstreaming@...ts.sr.ht
Cc:     martin.botka@...ainline.org,
        angelogioacchino.delregno@...ainline.org,
        marijn.suijten@...ainline.org, jamipkettunen@...ainline.org,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 14/39] arm64: dts: qcom: sdm630: Add TSENS node


On 29.07.2021 12:54, Thara Gopinath wrote:
>
>
> On 7/29/21 6:52 AM, Konrad Dybcio wrote:
>>
>> On 29.07.2021 12:50, Thara Gopinath wrote:
>>> Hi Konrad,
>>>
>>> On 7/28/21 6:25 PM, Konrad Dybcio wrote:
>>>> This will enable temperature reporting for various SoC
>>>> components.
>>>>
>>>> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
>>>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...ainline.org>
>>>> ---
>>>>    .../devicetree/bindings/thermal/qcom-tsens.yaml       |  1 +
>>>>    arch/arm64/boot/dts/qcom/sdm630.dtsi                  | 11 +++++++++++
>>>>    2 files changed, 12 insertions(+)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/thermal/qcom-tsens.yaml b/Documentation/devicetree/bindings/thermal/qcom-tsens.yaml
>>>> index 4a2eaf28e3fd..d3b9e9b600a2 100644
>>>> --- a/Documentation/devicetree/bindings/thermal/qcom-tsens.yaml
>>>> +++ b/Documentation/devicetree/bindings/thermal/qcom-tsens.yaml
>>>> @@ -48,6 +48,7 @@ properties:
>>>>                  - qcom,sc7180-tsens
>>>>                  - qcom,sc7280-tsens
>>>>                  - qcom,sc8180x-tsens
>>>> +              - qcom,sdm630-tsens
>>>>                  - qcom,sdm845-tsens
>>>>                  - qcom,sm8150-tsens
>>>>                  - qcom,sm8250-tsens
>>>> diff --git a/arch/arm64/boot/dts/qcom/sdm630.dtsi b/arch/arm64/boot/dts/qcom/sdm630.dtsi
>>>> index 1e54828817d5..7e9c80e35fba 100644
>>>> --- a/arch/arm64/boot/dts/qcom/sdm630.dtsi
>>>> +++ b/arch/arm64/boot/dts/qcom/sdm630.dtsi
>>>> @@ -627,6 +627,17 @@ mnoc: interconnect@...5000 {
>>>>                     <&mmcc AHB_CLK_SRC>;
>>>>            };
>>>>    +        tsens: thermal-sensor@...e000 {
>>>> +            compatible = "qcom,sdm630-tsens", "qcom,tsens-v2";
>>>> +            reg = <0x010ae000 0x1000>, /* TM */
>>>> +                  <0x010ad000 0x1000>; /* SROT */
>>>> +            #qcom,sensors = <12>;
>>>
>>> Are all 12 sensors used ? I see that in a later patch "arm64: dts: qcom: sdm630: Add thermal-zones configuration" only 9 are used.
>>
>> Hi,
>>
>> if I recall correctly, they all give output but not all of the mappings were documented in the downstream sources and we have no documentation whatsoever :(
>
> Right. In that case, why not change #qcom,sensors to 9 and add rest of the sensors if and when needed ?
>
I don't think it makes sense to describe the hardware incorrectly, even if some of it is unused.