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

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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: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Dmitry Osipenko 2021-12-12 00:14:02 +03:00 committed by Thierry Reding
parent 894ea1121b
commit 7525c2a354
1 changed files with 48 additions and 1 deletions
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49
arch/arm/boot/dts/tegra124-nyan.dtsi
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@ -1,5 +1,6 @@
// 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"