linux-kernel - Re: [PATCH v3 03/10] arm64: dts: qcom: kaanapali: Add TSENS and thermal zones

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Message-ID: <4ce28526-6900-44ee-a63c-d9099c0a1325@oss.qualcomm.com>
Date: Thu, 22 Jan 2026 18:02:33 +0530
From: Manaf Meethalavalappu Pallikunhi <manaf.pallikunhi@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: Jingyi Wang <jingyi.wang@....qualcomm.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>, aiqun.yu@....qualcomm.com,
        tingwei.zhang@....qualcomm.com, trilok.soni@....qualcomm.com,
        yijie.yang@....qualcomm.com, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        20260114-knp-remoteproc-v4-0-fcf0b04d01af@....qualcomm.com
Subject: Re: [PATCH v3 03/10] arm64: dts: qcom: kaanapali: Add TSENS and
 thermal zones

Hi Dmitry,


On 1/16/2026 2:12 AM, Dmitry Baryshkov wrote:
> On Thu, Jan 15, 2026 at 11:22:57AM +0100, Konrad Dybcio wrote:
>> On 1/15/26 8:09 AM, Dmitry Baryshkov wrote:
>>> On Wed, Jan 14, 2026 at 10:49:05PM -0800, Jingyi Wang wrote:
>>>> From: Manaf Meethalavalappu Pallikunhi <manaf.pallikunhi@....qualcomm.com>
>>>>
>>>> The Kaanapali includes seven TSENS instances, with a total of 55 thermal
>>>> sensors distributed across various locations on the SoC.
>>>>
>>>> The TSENS max/reset threshold is configured to 130°C in the hardware.
>>>> Enable all TSENS instances, and define the thermal zones with a critical
>>>> trip at 125°C
>>>>
>>>> Signed-off-by: Manaf Meethalavalappu Pallikunhi <manaf.pallikunhi@....qualcomm.com>
>>>> Signed-off-by: Jingyi Wang <jingyi.wang@....qualcomm.com>
>>>> ---
>>>>   arch/arm64/boot/dts/qcom/kaanapali.dtsi | 745 ++++++++++++++++++++++++++++++++
>>>>   1 file changed, 745 insertions(+)
>>>>
>>>> @@ -4795,6 +4879,667 @@ pdp_tx: scp-sram-section@100 {
>>>>   		};
>>>>   	};
>>>>   
>>>> +	thermal-zones {
>>>> +		cpullc-0-0-thermal {
>>>> +			thermal-sensors = <&tsens0 0>;
>>>> +
>>>> +			trips {
>>>> +				cpullc-0-0-critical {
>>>> +					temperature = <125000>;
>>>> +					hysteresis = <0>;
>>>> +					type = "critical";
>>> I'd really suggest having several "hot" trip points at a temp less than
>>> 125°C. (And 125°C for critical looks way too critical for me).
>> LMH and the firmware make sure this never happens, the critical trip
>> point is a last resort safety mechanism
> Looking at e.g. SM8650, I can't stop but notice "hot" trip points at
> 110°C and "critical" at 115°C. I think, LMH is a replacement for
> "passive" trip points. But for the thermal shutdown we should give users
> more warnings.

Sure, I will add a hot trip at 120C for all thermal zones in next revision.

Thanks,

Manaf

>