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

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Message-ID: <f123294b-b944-4723-bd74-713970468d51@oss.qualcomm.com>
Date: Tue, 10 Jun 2025 15:08:29 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: 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 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>
> ---

[...]

> +		tsens: thermal-sensor@...000 {
> +			compatible = "qcom,ipq5018-tsens";
> +			reg = <0x004a9000 0x1000>, /* TM */
> +			      <0x004a8000 0x1000>; /* SROT */

Please drop these comments

[...]

> +	thermal-zones {
> +		cpu-thermal {
> +			polling-delay-passive = <0>;
> +			polling-delay = <0>;
> +			thermal-sensors = <&tsens 2>;
> +
> +			trips {
> +				cpu-critical {
> +					temperature = <120000>;
> +					hysteresis = <2>;
> +					type = "critical";
> +				};
> +			};
> +		};
> +
> +		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..

> +					hysteresis = <2>;
> +					type = "critical";
> +				};
> +			};
> +		};
> +
> +		top-glue-thermal {
> +			polling-delay-passive = <0>;
> +			polling-delay = <0>;

0 is default here, you can drop all such entries

> +			thermal-sensors = <&tsens 3>;
> +
> +			trips {
> +				top_glue-critical {

underscores are not allowed in DTs (see:
Documentation/devicetree/bindings/dts-coding-style.rst)

use a hyphen instead

Konrad