linux-kernel - Re: [PATCH v2] arm64: dts: ls1088a: add one more thermal zone node

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Date:   Mon, 4 Mar 2019 14:21:16 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Yuantian Tang <andy.tang@....com>
Cc:     leoyang.li@....com, robh+dt@...nel.org, mark.rutland@....com,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        daniel.lezcano@...aro.org, rui.zhang@...el.com, edubezval@...il.com
Subject: Re: [PATCH v2] arm64: dts: ls1088a: add one more thermal zone node

On Mon, Mar 04, 2019 at 11:21:11AM +0800, Yuantian Tang wrote:
> Ls1088a has 2 thermal sensors, core cluster and SoC platform. Core cluster
> sensor is used to monitor the temperature of core and SoC platform is for
> platform. The current dts only support the first sensor.
> This patch adds the second sensor node to dts to enable it.
> 
> Signed-off-by: Yuantian Tang <andy.tang@....com>
> ---
> v2:
> 	- Add more information about sensors to description
> PS: In order to keep consistency to the first thermal-zone node, there will
> be "WARNING: line over 80 characters" warnings.
> 
>  arch/arm64/boot/dts/freescale/fsl-ls1088a.dtsi |   43 +++++++++++++++++++++--
>  1 files changed, 39 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1088a.dtsi b/arch/arm64/boot/dts/freescale/fsl-ls1088a.dtsi
> index 661137f..9f52bc9 100644
> --- a/arch/arm64/boot/dts/freescale/fsl-ls1088a.dtsi
> +++ b/arch/arm64/boot/dts/freescale/fsl-ls1088a.dtsi
> @@ -129,19 +129,19 @@
>  	};
>  
>  	thermal-zones {
> -		cpu_thermal: cpu-thermal {
> +		ccu {

Is this change really necessary?  What does 'ccu' stand for?

>  			polling-delay-passive = <1000>;
>  			polling-delay = <5000>;
>  			thermal-sensors = <&tmu 0>;
>  
>  			trips {
> -				cpu_alert: cpu-alert {
> +				ccu_alert: ccu-alert {
>  					temperature = <85000>;
>  					hysteresis = <2000>;
>  					type = "passive";
>  				};
>  
> -				cpu_crit: cpu-crit {
> +				ccu_crit: ccu-crit {
>  					temperature = <95000>;
>  					hysteresis = <2000>;
>  					type = "critical";
> @@ -150,7 +150,42 @@
>  
>  			cooling-maps {
>  				map0 {
> -					trip = <&cpu_alert>;
> +					trip = <&ccu_alert>;
> +					cooling-device =
> +						<&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> +						<&cpu1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> +						<&cpu2 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> +						<&cpu3 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> +						<&cpu4 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> +						<&cpu5 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> +						<&cpu6 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> +						<&cpu7 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
> +				};
> +			};
> +		};
> +
> +		plt {

What about 'platform-thermal' for node name, platform-alert and
platform-crit for trip nodes below?

Shawn

> +			polling-delay-passive = <1000>;
> +			polling-delay = <5000>;
> +			thermal-sensors = <&tmu 1>;
> +
> +			trips {
> +				plt_alert: plt-alert {
> +					temperature = <85000>;
> +					hysteresis = <2000>;
> +					type = "passive";
> +				};
> +
> +				plt_crit: plt-crit {
> +					temperature = <95000>;
> +					hysteresis = <2000>;
> +					type = "critical";
> +				};
> +			};
> +
> +			cooling-maps {
> +				map0 {
> +					trip = <&plt_alert>;
>  					cooling-device =
>  						<&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
>  						<&cpu1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> -- 
> 1.7.1
>