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riscv: dts: thead: Add PWM fan and thermal control

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Add Device Tree nodes to enable a PWM controlled fan and it's associated
thermal management for the Lichee Pi 4A board.

This enables temperature-controlled active cooling for the Lichee Pi 4A
board based on SoC temperature.

Reviewed-by: Drew Fustini <fustini@kernel.org>
Tested-by: Drew Fustini <fustini@kernel.org>
Reviewed-by: Elle Rhumsaa <elle@weathered-steel.dev>
Signed-off-by: Michal Wilczynski <m.wilczynski@samsung.com>
Signed-off-by: Drew Fustini <fustini@kernel.org>
This commit is contained in:
Michal Wilczynski 2025-10-16 15:38:07 +02:00 committed by Drew Fustini
parent b6b00b220d
commit a9fb9c7e3b
1 changed files with 67 additions and 0 deletions
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67
arch/riscv/boot/dts/thead/th1520-lichee-pi-4a.dts
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@ -28,9 +28,76 @@ aliases {
chosen {
stdout-path = "serial0:115200n8";
};
thermal-zones {
cpu-thermal {
polling-delay = <1000>;
polling-delay-passive = <1000>;
thermal-sensors = <&pvt 0>;
trips {
fan_config0: fan-trip0 {
temperature = <39000>;
hysteresis = <5000>;
type = "active";
};
fan_config1: fan-trip1 {
temperature = <50000>;
hysteresis = <5000>;
type = "active";
};
fan_config2: fan-trip2 {
temperature = <60000>;
hysteresis = <5000>;
type = "active";
};
};
cooling-maps {
map-active-0 {
cooling-device = <&fan 1 1>;
trip = <&fan_config0>;
};
map-active-1 {
cooling-device = <&fan 2 2>;
trip = <&fan_config1>;
};
map-active-2 {
cooling-device = <&fan 3 3>;
trip = <&fan_config2>;
};
};
};
};
fan: pwm-fan {
pinctrl-names = "default";
pinctrl-0 = <&fan_pins>;
compatible = "pwm-fan";
#cooling-cells = <2>;
pwms = <&pwm 1 10000000 0>;
cooling-levels = <0 66 196 255>;
};
};
&padctrl0_apsys {
fan_pins: fan-0 {
pwm1-pins {
pins = "GPIO3_3"; /* PWM1 */
function = "pwm";
bias-disable;
drive-strength = <25>;
input-disable;
input-schmitt-disable;
slew-rate = <0>;
};
};
uart0_pins: uart0-0 {
tx-pins {
pins = "UART0_TXD";