linux-kernel - Re: [PATCH v5] arm64: dts: ls1088a: add one more thermal zone node

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Date:   Thu, 11 Apr 2019 21:14:44 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Yuantian Tang <andy.tang@....com>, shawnguo@...nel.org
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,
        rui.zhang@...el.com, edubezval@...il.com
Subject: Re: [PATCH v5] arm64: dts: ls1088a: add one more thermal zone node

On 11/04/2019 10:32, 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>
> ---
> v5:
> 	- update the thermal zone name due to the length limitation
> 	- remove cooling map in platform zone
> v4:
> 	- use hyphen instead of underscore in node name
> v3:
> 	- use more descriptive name for each zone
> v2:
> 	- Add more information about sensors to description
>  arch/arm64/boot/dts/freescale/fsl-ls1088a.dtsi |   28 ++++++++++++++++++++---
>  1 files changed, 24 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1088a.dtsi b/arch/arm64/boot/dts/freescale/fsl-ls1088a.dtsi
> index de93b42..de39672 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 {
> +		core-cluster {
>  			polling-delay-passive = <1000>;
>  			polling-delay = <5000>;
>  			thermal-sensors = <&tmu 0>;
>  
>  			trips {
> -				cpu_alert: cpu-alert {
> +				core_cluster_alert: core-cluster-alert {
>  					temperature = <85000>;
>  					hysteresis = <2000>;
>  					type = "passive";
>  				};
>  
> -				cpu_crit: cpu-crit {
> +				core_cluster_crit: core-cluster-crit {
>  					temperature = <95000>;
>  					hysteresis = <2000>;
>  					type = "critical";
> @@ -150,7 +150,7 @@
>  
>  			cooling-maps {
>  				map0 {
> -					trip = <&cpu_alert>;
> +					trip = <&core_cluster_alert>;
>  					cooling-device =
>  						<&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
>  						<&cpu1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> @@ -163,6 +163,26 @@
>  				};
>  			};
>  		};
> +
> +		platform {
> +			polling-delay-passive = <1000>;
> +			polling-delay = <5000>;
> +			thermal-sensors = <&tmu 1>;
> +
> +			trips {
> +				platform-alert {
> +					temperature = <85000>;
> +					hysteresis = <2000>;
> +					type = "passive";
> +				};
> +
> +				platform-crit {
> +					temperature = <95000>;
> +					hysteresis = <2000>;
> +					type = "critical";
> +				};
> +			};
> +		};


Unfortunately, the documentation says the thermal zone node must contain
a "cooling-maps" entry.

It makes sense as if there is no cooling device, there is no action to
be taken thus polling the temperature just add noise to the system.



>  	};
>  
>  	timer {
> 


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