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Message-Id: <20250427-tx2-therm-v1-1-65ddb4314723@gmail.com>
Date: Sun, 27 Apr 2025 15:05:32 -0500
From: Aaron Kling via B4 Relay <devnull+webgeek1234.gmail.com@...nel.org>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Thierry Reding <thierry.reding@...il.com>,
Jonathan Hunter <jonathanh@...dia.com>
Cc: devicetree@...r.kernel.org, linux-tegra@...r.kernel.org,
linux-kernel@...r.kernel.org, Aaron Kling <webgeek1234@...il.com>
Subject: [PATCH] arm64: tegra: Enable PWM fan on the Jetson TX2 Devkit
From: Aaron Kling <webgeek1234@...il.com>
This is based on the existing configuration of the Jetson TX2 NX devkit.
The fan and thermal characteristics of the two devkits are similar, so
using the same configuration.
Signed-off-by: Aaron Kling <webgeek1234@...il.com>
---
arch/arm64/boot/dts/nvidia/tegra186-p2771-0000.dts | 109 +++++++++++++++++++++
1 file changed, 109 insertions(+)
diff --git a/arch/arm64/boot/dts/nvidia/tegra186-p2771-0000.dts b/arch/arm64/boot/dts/nvidia/tegra186-p2771-0000.dts
index 15aa49fc450399c7bd525adcdb6e92a27a185805..a50fd205daa868d58baa6af085d6409560c5c740 100644
--- a/arch/arm64/boot/dts/nvidia/tegra186-p2771-0000.dts
+++ b/arch/arm64/boot/dts/nvidia/tegra186-p2771-0000.dts
@@ -2409,6 +2409,10 @@ eeprom@57 {
};
};
+ pwm@...0000 {
+ status = "okay";
+ };
+
pcie@...03000 {
status = "okay";
@@ -2508,6 +2512,16 @@ key-volume-up {
};
};
+ fan: pwm-fan {
+ compatible = "pwm-fan";
+ pwms = <&pwm4 0 45334>;
+ fan-supply = <&vdd_fan>;
+
+ /* cooling level (0, 1, 2, 3) - pwm inverted */
+ cooling-levels = <255 128 64 0>;
+ #cooling-cells = <2>;
+ };
+
vdd_sd: regulator-vdd-sd {
compatible = "regulator-fixed";
regulator-name = "SD_CARD_SW_PWR";
@@ -2556,6 +2570,17 @@ vdd_usb1: regulator-vdd-usb1 {
vin-supply = <&vdd_5v0_sys>;
};
+ vdd_fan: regulator-vdd-fan {
+ compatible = "regulator-fixed";
+ regulator-name = "VDD_FAN";
+ regulator-min-microvolt = <5000000>;
+ regulator-max-microvolt = <5000000>;
+
+ gpio = <&exp1 4 GPIO_ACTIVE_LOW>;
+
+ vin-supply = <&vdd_5v0_sys>;
+ };
+
sound {
compatible = "nvidia,tegra186-audio-graph-card";
status = "okay";
@@ -2621,4 +2646,88 @@ sound {
label = "NVIDIA Jetson TX2 APE";
};
+
+ thermal-zones {
+ cpu-thermal {
+ polling-delay = <0>;
+ polling-delay-passive = <500>;
+ status = "okay";
+
+ trips {
+ cpu_trip_critical: critical {
+ temperature = <96500>;
+ hysteresis = <0>;
+ type = "critical";
+ };
+
+ cpu_trip_hot: hot {
+ temperature = <79000>;
+ hysteresis = <2000>;
+ type = "hot";
+ };
+
+ cpu_trip_active: active {
+ temperature = <62000>;
+ hysteresis = <2000>;
+ type = "active";
+ };
+
+ cpu_trip_passive: passive {
+ temperature = <45000>;
+ hysteresis = <2000>;
+ type = "passive";
+ };
+ };
+
+ cooling-maps {
+ map0 {
+ cooling-device = <&fan 3 3>;
+ trip = <&cpu_trip_critical>;
+ };
+
+ map1 {
+ cooling-device = <&fan 2 2>;
+ trip = <&cpu_trip_hot>;
+ };
+
+ map2 {
+ cooling-device = <&fan 1 1>;
+ trip = <&cpu_trip_active>;
+ };
+
+ map3 {
+ cooling-device = <&fan 0 0>;
+ trip = <&cpu_trip_passive>;
+ };
+ };
+ };
+
+ aux-thermal {
+ polling-delay = <0>;
+ polling-delay-passive = <500>;
+ status = "okay";
+
+ trips {
+ aux_alert0: critical {
+ temperature = <90000>;
+ hysteresis = <0>;
+ type = "critical";
+ };
+ };
+ };
+
+ gpu-thermal {
+ polling-delay = <0>;
+ polling-delay-passive = <500>;
+ status = "okay";
+
+ trips {
+ gpu_alert0: critical {
+ temperature = <99000>;
+ hysteresis = <0>;
+ type = "critical";
+ };
+ };
+ };
+ };
};
---
base-commit: 5bc1018675ec28a8a60d83b378d8c3991faa5a27
change-id: 20250426-tx2-therm-cce1999a0e4d
Best regards,
--
Aaron Kling <webgeek1234@...il.com>
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