linux-kernel - [PATCH v2] arm64: dts: rockchip: add pwm-fan for NanoPC-T6

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Message-ID: <20251109192128.72527-1-sigmaris@gmail.com>
Date: Sun,  9 Nov 2025 19:20:51 +0000
From: Hugh Cole-Baker <sigmaris@...il.com>
To: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>
Cc: Dragan Simic <dsimic@...jaro.org>,
	Alexey Charkov <alchark@...il.com>,
	Hugh Cole-Baker <sigmaris@...il.com>,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2] arm64: dts: rockchip: add pwm-fan for NanoPC-T6

FriendlyELEC offers an optional heatsink and fan addon for the NanoPC-T6
and T6 LTS, which plugs in to the fan connector on the board driven by
pwm1. Add the fan as an active cooling device for the SoC package.

Signed-off-by: Hugh Cole-Baker <sigmaris@...il.com>
---
Changes from v1: https://lore.kernel.org/linux-rockchip/20251026194858.92461-1-sigmaris@gmail.com/
* add the fan to the base board dtsi instead of overlay (Heiko)
* just use 2 trip points for warm and hot temperatures (Dragan, Alexey)

References:
FriendlyELEC heatsink with fan addon:
https://www.friendlyelec.com/index.php?route=product/product&product_id=305
Vendor DT with trip points and PWM duty cycle values:
https://github.com/friendlyarm/kernel-rockchip/blob/4944602540b62f5aad139fe602a76cf7c3176128/arch/arm64/boot/dts/rockchip/rk3588-nanopi6-rev01.dts#L75-L90

 .../boot/dts/rockchip/rk3588-nanopc-t6.dtsi   | 39 +++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6.dtsi b/arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6.dtsi
index fafeabe9adf9e..9164a0ee6228e 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6.dtsi
@@ -11,6 +11,7 @@
 #include <dt-bindings/input/input.h>
 #include <dt-bindings/pinctrl/rockchip.h>
 #include <dt-bindings/soc/rockchip,vop2.h>
+#include <dt-bindings/thermal/thermal.h>
 #include <dt-bindings/usb/pd.h>
 #include "rk3588.dtsi"
 
@@ -89,6 +90,14 @@ usr_led: led-1 {
 		};
 	};
 
+	fan: pwm-fan {
+		compatible = "pwm-fan";
+		cooling-levels = <0 35 64 100 150 255>;
+		fan-supply = <&vcc5v0_sys>;
+		pwms = <&pwm1 0 50000 0>;
+		#cooling-cells = <2>;
+	};
+
 	sound {
 		compatible = "simple-audio-card";
 		pinctrl-names = "default";
@@ -591,6 +600,36 @@ &i2s6_8ch {
 	status = "okay";
 };
 
+&package_thermal {
+	polling-delay = <1000>;
+
+	trips {
+		package_warm: package-warm {
+			temperature = <50000>;
+			hysteresis = <2000>;
+			type = "active";
+		};
+
+		package_hot: package-hot {
+			temperature = <60000>;
+			hysteresis = <2000>;
+			type = "active";
+		};
+	};
+
+	cooling-maps {
+		map0 {
+			trip = <&package_warm>;
+			cooling-device = <&fan THERMAL_NO_LIMIT 1>;
+		};
+
+		map1 {
+			trip = <&package_hot>;
+			cooling-device = <&fan 2 THERMAL_NO_LIMIT>;
+		};
+	};
+};
+
 &pcie2x1l0 {
 	reset-gpios = <&gpio4 RK_PB3 GPIO_ACTIVE_HIGH>;
 	vpcie3v3-supply = <&vcc_3v3_pcie20>;
-- 
2.50.1 (Apple Git-155)