linux-kernel - Re: [PATCH V15 RESEND 5/5] arm64: dts: imx: add i.MX8QXP thermal support

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Message-ID: <20200221130448.GC10516@linaro.org>
Date:   Fri, 21 Feb 2020 14:04:48 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Anson Huang <Anson.Huang@....com>
Cc:     robh+dt@...nel.org, mark.rutland@....com, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        catalin.marinas@....com, will@...nel.org, rui.zhang@...el.com,
        amit.kucheria@...durent.com, aisheng.dong@....com,
        linux@...ck-us.net, srinivas.kandagatla@...aro.org,
        krzk@...nel.org, fugang.duan@....com, peng.fan@....com,
        daniel.baluta@....com, bjorn.andersson@...aro.org, olof@...om.net,
        dinguyen@...nel.org, leonard.crestez@....com,
        marcin.juszkiewicz@...aro.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-pm@...r.kernel.org, Linux-imx@....com
Subject: Re: [PATCH V15 RESEND 5/5] arm64: dts: imx: add i.MX8QXP thermal
 support

On Thu, Feb 20, 2020 at 09:10:28AM +0800, Anson Huang wrote:
> Add i.MX8QXP CPU thermal zone support.
> 
> Signed-off-by: Anson Huang <Anson.Huang@....com>
> ---
> No change.
> ---
>  arch/arm64/boot/dts/freescale/imx8qxp.dtsi | 36 ++++++++++++++++++++++++++++++
>  1 file changed, 36 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8qxp.dtsi b/arch/arm64/boot/dts/freescale/imx8qxp.dtsi
> index fb5f752..0a14fe4 100644
> --- a/arch/arm64/boot/dts/freescale/imx8qxp.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8qxp.dtsi
> @@ -11,6 +11,7 @@
>  #include <dt-bindings/input/input.h>
>  #include <dt-bindings/interrupt-controller/arm-gic.h>
>  #include <dt-bindings/pinctrl/pads-imx8qxp.h>
> +#include <dt-bindings/thermal/thermal.h>
>  
>  / {
>  	interrupt-parent = <&gic>;
> @@ -189,6 +190,11 @@
>  			compatible = "fsl,imx8qxp-sc-wdt", "fsl,imx-sc-wdt";
>  			timeout-sec = <60>;
>  		};
> +
> +		tsens: thermal-sensor {
> +			compatible = "fsl,imx8qxp-sc-thermal", "fsl,imx-sc-thermal";
> +			#thermal-sensor-cells = <1>;
> +		};
>  	};
>  
>  	timer {
> @@ -586,4 +592,34 @@
>  			#clock-cells = <1>;
>  		};
>  	};
> +
> +	thermal_zones: thermal-zones {
> +		cpu-thermal0 {
> +			polling-delay-passive = <250>;
> +			polling-delay = <2000>;
> +			thermal-sensors = <&tsens IMX_SC_R_SYSTEM>;
> +			trips {
> +				cpu_alert0: trip0 {
> +					temperature = <107000>;
> +					hysteresis = <2000>;
> +					type = "passive";
> +				};

May be you can add a 'hot' trip point before 'critical' for future use before
reaching the emergency shutdown.

> +				cpu_crit0: trip1 {
> +					temperature = <127000>;
> +					hysteresis = <2000>;
> +					type = "critical";
> +				};
> +			};
> +			cooling-maps {
> +				map0 {
> +					trip = <&cpu_alert0>;
> +					cooling-device =
> +						<&A35_0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> +						<&A35_1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> +						<&A35_2 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> +						<&A35_3 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
> +				};
> +			};
> +		};
> +	};
>  };
> -- 
> 2.7.4
> 

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