linux-kernel - Re: [v7,1/3] arm64: dts: mt8183: add thermal zone node

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Message-ID: <f7003979-0210-882e-bb28-f24047e18061@linaro.org>
Date:   Fri, 9 Apr 2021 10:09:59 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Michael Kao <michael.kao@...iatek.com>, fan.chen@...iatek.com,
        Zhang Rui <rui.zhang@...el.com>, linux-pm@...r.kernel.org,
        srv_heupstream@...iatek.com
Cc:     Eduardo Valentin <edubezval@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>, hsinyi@...omium.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [v7,1/3] arm64: dts: mt8183: add thermal zone node

On 16/03/2021 08:01, Michael Kao wrote:
> From: "michael.kao" <michael.kao@...iatek.com>
> 
> Add thermal zone node to Mediatek MT8183 dts file.
> 
> Evaluate the thermal zone every 500ms while not cooling
> and every 100ms when passive cooling is performed.
> 
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> Signed-off-by: Michael Kao <michael.kao@...iatek.com>
> ---
>  arch/arm64/boot/dts/mediatek/mt8183.dtsi | 85 ++++++++++++++++++++++++
>  1 file changed, 85 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt8183.dtsi b/arch/arm64/boot/dts/mediatek/mt8183.dtsi
> index 5b782a4769e7..d3550af06408 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8183.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8183.dtsi
> @@ -657,6 +657,87 @@
>  			status = "disabled";
>  		};
>  
> +		thermal: thermal@...0b000 {
> +			#thermal-sensor-cells = <1>;
> +			compatible = "mediatek,mt8183-thermal";
> +			reg = <0 0x1100b000 0 0x1000>;
> +			clocks = <&infracfg CLK_INFRA_THERM>,
> +				 <&infracfg CLK_INFRA_AUXADC>;
> +			clock-names = "therm", "auxadc";
> +			resets = <&infracfg  MT8183_INFRACFG_AO_THERM_SW_RST>;
> +			interrupts = <0 76 IRQ_TYPE_LEVEL_LOW>;
> +			mediatek,auxadc = <&auxadc>;
> +			mediatek,apmixedsys = <&apmixedsys>;
> +			nvmem-cells = <&thermal_calibration>;
> +			nvmem-cell-names = "calibration-data";
> +		};
> +
> +		thermal-zones {
> +			cpu_thermal: cpu_thermal {
> +				polling-delay-passive = <100>;
> +				polling-delay = <500>;
> +				thermal-sensors = <&thermal 0>;
> +				sustainable-power = <5000>;
> +			};
> +
> +			/* The tzts1 ~ tzts6 don't need to polling */
> +			/* The tzts1 ~ tzts6 don't need to thermal throttle */
> +
> +			tzts1: tzts1 {
> +				polling-delay-passive = <0>;
> +				polling-delay = <0>;
> +				thermal-sensors = <&thermal 1>;
> +				sustainable-power = <5000>;
> +				trips {};
> +				cooling-maps {};
> +			};

What is the point of defining the sustainable power with no cooling
device associated ?



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