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Message-ID: <20251026194858.92461-1-sigmaris@gmail.com>
Date: Sun, 26 Oct 2025 19:48:40 +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: 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] arm64: dts: rockchip: pwm-fan overlay for NanoPC-T6
FriendlyELEC offers an optional heatsink and fan addon for the NanoPC-T6
and T6 LTS. Add an overlay which can be applied if the fan is fitted and
configures the fan as an active cooling device for the SoC package.
Signed-off-by: Hugh Cole-Baker <sigmaris@...il.com>
---
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
arch/arm64/boot/dts/rockchip/Makefile | 9 +++
.../dts/rockchip/rk3588-nanopc-t6-fan.dtso | 78 +++++++++++++++++++
2 files changed, 87 insertions(+)
create mode 100644 arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6-fan.dtso
diff --git a/arch/arm64/boot/dts/rockchip/Makefile b/arch/arm64/boot/dts/rockchip/Makefile
index 4cd8ef607f55c..7a67b68a6bb03 100644
--- a/arch/arm64/boot/dts/rockchip/Makefile
+++ b/arch/arm64/boot/dts/rockchip/Makefile
@@ -178,6 +178,7 @@ dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-jaguar-ethernet-switch.dtbo
dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-jaguar-pre-ict-tester.dtbo
dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-mnt-reform2.dtb
dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-nanopc-t6.dtb
+dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-nanopc-t6-fan.dtbo
dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-nanopc-t6-lts.dtb
dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-ok3588-c.dtb
dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-orangepi-5-max.dtb
@@ -271,6 +272,14 @@ dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-jaguar-pre-ict-tester.dtb
rk3588-jaguar-pre-ict-tester-dtbs := rk3588-jaguar.dtb \
rk3588-jaguar-pre-ict-tester.dtbo
+dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-nanopc-t6-with-fan.dtb
+rk3588-nanopc-t6-with-fan-dtbs := rk3588-nanopc-t6.dtb \
+ rk3588-nanopc-t6-fan.dtbo
+
+dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-nanopc-t6-lts-with-fan.dtb
+rk3588-nanopc-t6-lts-with-fan-dtbs := rk3588-nanopc-t6-lts.dtb \
+ rk3588-nanopc-t6-fan.dtbo
+
dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-rock-5b-pcie-ep.dtb
rk3588-rock-5b-pcie-ep-dtbs := rk3588-rock-5b.dtb \
rk3588-rock-5b-pcie-ep.dtbo
diff --git a/arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6-fan.dtso b/arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6-fan.dtso
new file mode 100644
index 0000000000000..08c4782fb4148
--- /dev/null
+++ b/arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6-fan.dtso
@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/thermal/thermal.h>
+
+&{/} {
+ 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>;
+ };
+};
+
+&package_thermal {
+ polling-delay = <1000>;
+
+ trips {
+ package_fan0: package-fan0 {
+ temperature = <50000>;
+ hysteresis = <2000>;
+ type = "active";
+ };
+
+ package_fan1: package-fan1 {
+ temperature = <55000>;
+ hysteresis = <2000>;
+ type = "active";
+ };
+
+ package_fan2: package-fan2 {
+ temperature = <60000>;
+ hysteresis = <2000>;
+ type = "active";
+ };
+
+ package_fan3: package-fan3 {
+ temperature = <65000>;
+ hysteresis = <2000>;
+ type = "active";
+ };
+
+ package_fan4: package-fan4 {
+ temperature = <70000>;
+ hysteresis = <2000>;
+ type = "active";
+ };
+ };
+
+ cooling-maps {
+ map0 {
+ trip = <&package_fan0>;
+ cooling-device = <&fan THERMAL_NO_LIMIT 1>;
+ };
+
+ map1 {
+ trip = <&package_fan1>;
+ cooling-device = <&fan 2 3>;
+ };
+
+ map2 {
+ trip = <&package_fan2>;
+ cooling-device = <&fan 3 4>;
+ };
+
+ map3 {
+ trip = <&package_fan3>;
+ cooling-device = <&fan 4 5>;
+ };
+
+ map4 {
+ trip = <&package_fan4>;
+ cooling-device = <&fan 5 THERMAL_NO_LIMIT>;
+ };
+ };
+};
--
2.50.1 (Apple Git-155)
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