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

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Message-ID: <vjx3bd75zdgdh6hzhrmlv5tlarnf6ea3yklwhg7jx6momknase@kstxwngyicd3>
Date: Thu, 15 Jan 2026 22:42:27 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: 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,
        Manaf Meethalavalappu Pallikunhi <manaf.pallikunhi@....qualcomm.com>
Subject: Re: [PATCH v3 03/10] arm64: dts: qcom: kaanapali: Add TSENS and
 thermal zones

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.

-- 
With best wishes
Dmitry