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

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Message-ID: <3cbdae12-af7f-47ee-89dd-6c00660fa6da@oss.qualcomm.com>
Date: Thu, 15 Jan 2026 11:22:57 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        Jingyi Wang <jingyi.wang@....qualcomm.com>
Cc: 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,
        Manaf Meethalavalappu Pallikunhi <manaf.pallikunhi@....qualcomm.com>
Subject: Re: [PATCH v3 03/10] arm64: dts: qcom: kaanapali: Add TSENS and
 thermal zones

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

Konrad