[PATCH] arm64: dts: rockchip: pwm-fan overlay for NanoPC-T6

[Hugh Cole-Baker <sigmaris@gmail.com>]

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@gmail.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)