linux-kernel - [PATCH v2] arm64: tegra: Enable PWM fan on Jetson Nano

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Message-Id: <20191208195531.11745-1-tszucs@protonmail.ch>
Date:   Sun,  8 Dec 2019 20:55:31 +0100
From:   Tamás Szűcs <tszucs@...tonmail.ch>
To:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Sowjanya Komatineni <skomatineni@...dia.com>,
        devicetree@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Tamás Szűcs <tszucs@...tonmail.ch>
Subject: [PATCH v2] arm64: tegra: Enable PWM fan on Jetson Nano

Enable PWM fan and extend CPU thermal zones for monitoring and fan control.
This will trigger the PWM fan on J15 and cool down the system if necessary.

Signed-off-by: Tamás Szűcs <tszucs@...tonmail.ch>
---
Changes in v2:
- clean up redundant lines

 .../boot/dts/nvidia/tegra210-p3450-0000.dts   | 60 +++++++++++++++++++
 1 file changed, 60 insertions(+)

diff --git a/arch/arm64/boot/dts/nvidia/tegra210-p3450-0000.dts b/arch/arm64/boot/dts/nvidia/tegra210-p3450-0000.dts
index 90381d52ac54..f2a138b14e36 100644
--- a/arch/arm64/boot/dts/nvidia/tegra210-p3450-0000.dts
+++ b/arch/arm64/boot/dts/nvidia/tegra210-p3450-0000.dts
@@ -573,6 +573,66 @@
 		};
 	};
 
+	fan: fan {
+		compatible = "pwm-fan";
+		pwms = <&pwm 3 45334>;
+
+		cooling-levels = <0 64 128 255>;
+		#cooling-cells = <2>;
+	};
+
+	thermal-zones {
+		cpu {
+			trips {
+				cpu_trip_critical: critical {
+					temperature = <96500>;
+					hysteresis = <0>;
+					type = "critical";
+				};
+
+				cpu_trip_hot: hot {
+					temperature = <70000>;
+					hysteresis = <2000>;
+					type = "hot";
+				};
+
+				cpu_trip_active: active {
+					temperature = <50000>;
+					hysteresis = <2000>;
+					type = "active";
+				};
+
+				cpu_trip_passive: passive {
+					temperature = <30000>;
+					hysteresis = <2000>;
+					type = "passive";
+				};
+			};
+
+			cooling-maps {
+				cpu-critical {
+					cooling-device = <&fan 3 3>;
+					trip = <&cpu_trip_critical>;
+				};
+
+				cpu-hot {
+					cooling-device = <&fan 2 2>;
+					trip = <&cpu_trip_hot>;
+				};
+
+				cpu-active {
+					cooling-device = <&fan 1 1>;
+					trip = <&cpu_trip_active>;
+				};
+
+				cpu-passive {
+					cooling-device = <&fan 0 0>;
+					trip = <&cpu_trip_passive>;
+				};
+			};
+		};
+	};
+
 	gpio-keys {
 		compatible = "gpio-keys";
 
-- 
2.20.1