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[v4,18/24] ARM: tegra: Add CPU thermal zones to Nyan device-tree

Message ID 20211130223820.23609-19-digetx@gmail.com
State Superseded
Headers show
Series NVIDIA Tegra ARM32 device-tree patches for 5.17 (new devices and more) | expand

Commit Message

Dmitry Osipenko Nov. 30, 2021, 10:38 p.m. UTC 
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>
---
 arch/arm/boot/dts/tegra124-nyan.dtsi | 49 +++++++++++++++++++++++++++-
 1 file changed, 48 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/arch/arm/boot/dts/tegra124-nyan.dtsi b/arch/arm/boot/dts/tegra124-nyan.dtsi
index ec01a23d4d47..b16cce7476ef 100644
--- a/arch/arm/boot/dts/tegra124-nyan.dtsi
+++ b/arch/arm/boot/dts/tegra124-nyan.dtsi
@@ -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"