Commit 7525c2a3 authored by Dmitry Osipenko's avatar Dmitry Osipenko Committed by Thierry Reding
Browse files

ARM: tegra: Add CPU thermal zones to Nyan device-tree 



CPU of Nyan Chromebooks is overheating badly because apparently hardware
soctherm controller doesn't work well. Add CPU thermal zones to enable
software thermal control over CPU and fix the overheat trouble.

Tested-by: Thomas Graichen <thomas.graichen@gmail.com> # T124 Nyan Big
Signed-off-by: default avatarDmitry Osipenko <digetx@gmail.com>
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent 894ea112

arch/arm/boot/dts/tegra124-nyan.dtsi

+48 −1
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

#include <dt-bindings/input/input.h>

#include <dt-bindings/thermal/thermal.h>

#include "tegra124.dtsi"



/ {
@@ -87,7 +88,7 @@ acodec: audio-codec@10 { 
			interrupts = <TEGRA_GPIO(H, 4) IRQ_TYPE_EDGE_FALLING>;

		};



		temperature-sensor@4c {

		tmp451: temperature-sensor@4c {

			compatible = "ti,tmp451";

			reg = <0x4c>;

			interrupt-parent = <&gpio>;
@@ -789,6 +790,52 @@ gpio-restart { 
		gpios = <&gpio TEGRA_GPIO(I, 5) GPIO_ACTIVE_LOW>;

		priority = <200>;

	};



	cpus {

		cpu0: cpu@0 {

			#cooling-cells = <2>;

		};



		cpu1: cpu@1 {

			#cooling-cells = <2>;

		};



		cpu2: cpu@2 {

			#cooling-cells = <2>;

		};



		cpu3: cpu@3 {

			#cooling-cells = <2>;

		};

	};



	thermal-zones {

		cpu-skin-thermal {

			polling-delay-passive = <1000>; /* milliseconds */

			polling-delay = <5000>; /* milliseconds */



			thermal-sensors = <&tmp451 0>;



			trips {

				cpu_passive_trip: cpu-alert0 {

					/* throttle at 70C until temperature drops to 69.8C */

					temperature = <70000>;

					hysteresis = <200>;

					type = "passive";

				};

			};



			cooling-maps {

				map0 {

					trip = <&cpu_passive_trip>;

					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>;

				};

			};

		};

	};

};



#include "cros-ec-keyboard.dtsi"