linux-kernel - Re: [PATCH 03/11] arm64: dts: qcom: pm8994: Add thermal-zones for temp alarm

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Date:   Mon, 5 Oct 2020 17:25:32 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Konrad Dybcio <konradybcio@...il.com>
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/11] arm64: dts: qcom: pm8994: Add thermal-zones for
 temp alarm

On 05/10/2020 17:03, Konrad Dybcio wrote:
> This will shut down the platform in case the PMIC overheats.
> 
> Signed-off-by: Konrad Dybcio <konradybcio@...il.com>
> ---
>  arch/arm64/boot/dts/qcom/pm8994.dtsi | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/pm8994.dtsi b/arch/arm64/boot/dts/qcom/pm8994.dtsi
> index 7825208b0d8b..9ab5657f7d23 100644
> --- a/arch/arm64/boot/dts/qcom/pm8994.dtsi
> +++ b/arch/arm64/boot/dts/qcom/pm8994.dtsi
> @@ -4,6 +4,30 @@
>  #include <dt-bindings/interrupt-controller/irq.h>
>  #include <dt-bindings/spmi/spmi.h>
>  
> +/ {
> +	thermal-zones {
> +		pm8994 {
> +			polling-delay-passive = <250>;
> +			polling-delay = <1000>;
> +
> +			thermal-sensors = <&pm8994_temp>;
> +
> +			trips {
> +				pm8994_alert0: pm8994-alert0 {
> +					temperature = <95000>;
> +					hysteresis = <2000>;
> +					type = "passive";
> +				};

Don't you want to add a 'hot' trip point, so userspace can get the
notification and have an opportunity to do some action like unplugging
some CPU before a wild shutdown happens ?

> +				pm8994_crit: pm8994-crit {
> +					temperature = <125000>;
> +					hysteresis = <2000>;
> +					type = "critical";
> +				};
> +			};
> +		};
> +	};
> +};
> +
>  &spmi_bus {
>  
>  	pmic@0 {
> 


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