linux-kernel - Re: [PATCH v10] arm64: dts: qcom: ipq5018: Add tsens node

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Message-ID: <73e2881f-b899-45a4-a59e-47593283b63b@oss.qualcomm.com>
Date: Tue, 10 Jun 2025 16:09:18 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: George Moussalem <george.moussalem@...look.com>,
        Amit Kucheria <amitk@...nel.org>,
        Thara Gopinath <thara.gopinath@...il.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Zhang Rui <rui.zhang@...el.com>, Lukasz Luba <lukasz.luba@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sricharan Ramabadhran <quic_srichara@...cinc.com>,
        Dmitry Baryshkov <lumag@...nel.org>
Subject: Re: [PATCH v10] arm64: dts: qcom: ipq5018: Add tsens node

On 6/10/25 4:06 PM, George Moussalem wrote:
> 
> 
> On 6/10/25 17:08, Konrad Dybcio wrote:
>> On 6/10/25 3:03 PM, George Moussalem via B4 Relay wrote:
>>> From: Sricharan Ramabadhran <quic_srichara@...cinc.com>
>>>
>>> IPQ5018 has tsens V1.0 IP with 5 sensors, though 4 are in use.
>>> There is no RPM, so tsens has to be manually enabled. Adding the tsens
>>> and nvmem nodes and adding 4 thermal sensors (zones). With the
>>> critical temperature being 120'C and action is to reboot.
>>>
>>> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
>>> Signed-off-by: Sricharan Ramabadhran <quic_srichara@...cinc.com>
>>> Signed-off-by: George Moussalem <george.moussalem@...look.com>
>>> ---

[...]

>>> +        gephy-thermal {
>>> +            polling-delay-passive = <0>;
>>> +            polling-delay = <0>;
>>> +            thermal-sensors = <&tsens 4>;
>>> +
>>> +            trips {
>>> +                gephy-critical {
>>> +                    temperature = <120000>;
>>
>> I'm not sure whether there's any firmware/hardware measure to shut
>> down these beforehand. It's better to have a software trip at 120C
>> than to not have any at all, but you may want to try and find a
>> case_therm or so thermistor for your devices..
> 
> these are the temps as defined for the critical trips by qcom. IPQ8074 has the temp set at 110C, while IPQ6018 even higher at 125C.
> They've also defined lower temp trips in the downstream DTS files.
> Should I try and add those? I could check if the driver supports them..

you can register the CPUs as a cooling device and add some sort of a
trip point (see e.g. ipq6018.dtsi)

Konrad