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SubjectRe: [PATCH v5] arm64: dts: ls1088a: add one more thermal zone node
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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@nxp.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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