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Add and update files for pwm-gpio-fan overlay
Add and update files for pwm-gpio-fan overlay Signed-off-by: Kai-Uwe Herbing <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,170 @@ | ||
| /* | ||
| * Overlay for a GPIO connected PWM cooling fan controlled by software GPIO PWM | ||
| * | ||
| * Optional parameters: | ||
| * - "fan_gpio" BCM number of the pin driving the fan, default 18 (GPIO18) | ||
| * | ||
| * - "fan_temp0" CPU temperature at which fan is started with low speed in millicelsius, | ||
| * default 55000 (55 °C) | ||
| * - "fan_temp1" CPU temperature at which fan is switched to medium speed in millicelsius, | ||
| * default 60000 (60 °C) | ||
| * - "fan_temp2" CPU temperature at which fan is switched to high speed in millicelsius, | ||
| * default 67500 (67.5 °C) | ||
| * - "fan_temp3" CPU temperature at which fan is switched to max speed in millicelsius, | ||
| * default 75000 (75 °C) | ||
| * - "fan_temp0_hyst" Temperature hysteris at which fan is stopped in millicelsius, | ||
| * default 5000 (resulting in 50 °C) | ||
| * - "fan_temp1_hyst" Temperature hysteris at which fan is switched back to low speed | ||
| * in millicelsius, default 5000 (resulting in 55 °C) | ||
| * - "fan_temp2_hyst" Temperature hysteris at which fan is switched back to medium speed | ||
| * in millicelsius, default 5000 (resulting in 62.5 °C) | ||
| * - "fan_temp3_hyst" Temperature hysteris at which fan is switched back to high speed | ||
| * in millicelsius, default 5000 (resulting in 70 °C) | ||
| * - "fan_temp0_speed" Fan speed for low cooling state in range 0 to 255, | ||
| * default 114 (45% PWM duty cycle) | ||
| * - "fan_temp1_speed" Fan speed for medium cooling state in range 0 to 255, | ||
| * default 152 (60% PWM duty cycle) | ||
| * - "fan_temp2_speed" Fan speed for high cooling state in range 0 to 255, | ||
| * default 204 (80% PWM duty cycle) | ||
| * - "fan_temp3_speed" Fan speed for max cooling state in range 0 to 255, | ||
| * default 255 (100% PWM duty cycle) | ||
| * | ||
| * N.B. | ||
| * - Uses the software GPIO PWM kernel module instead of the Pis hardware PWMs (PWM0/PWM1). | ||
| * This will allow for an undisturbed concurrent usage of the Pis analogue audio output. | ||
| * | ||
| * Requires: | ||
| * - A PWM controlled cooling fan connected to the GPIO, such as an | ||
| * Argon mini-fan, HighPi Pro Fan or Waveshare FAN-4020-PWM-5V | ||
| * - Raspberry Pi OS Bookworm with kernel 6.6.62 or above | ||
| * | ||
| * Build: | ||
| * - sudo dtc -I dts -O dtb -o /boot/firmware/overlays/pwm-gpiofan.dtbo pwm-gpiofan-overlay.dts | ||
| * | ||
| * Activate: | ||
| * - sudo nano /boot/firmware/config.txt add "dtoverlay=pwm-gpiofan" | ||
| * | ||
| */ | ||
| /dts-v1/; | ||
| /plugin/; | ||
|
|
||
| / { | ||
| compatible = "brcm,bcm2835"; | ||
|
|
||
| fragment@0 { | ||
| target = <&gpio>; | ||
| __overlay__ { | ||
| pwm_gpio_pins: pwm_gpio_pins { | ||
| brcm,pins = <18>; /* gpio-pin = 18 */ | ||
| brcm,function = <1>; /* gpio function = output */ | ||
| brcm,pull = <0>; /* gpio pull up/down = off */ | ||
| }; | ||
| }; | ||
| }; | ||
|
|
||
| fragment@1 { | ||
| target-path = "/"; | ||
| __overlay__ { | ||
| pwm_gpio: pwm_gpio { | ||
| compatible="pwm-gpio"; | ||
| #pwm-cells = <2>; | ||
| pinctrl-names = "default"; | ||
| pinctrl-0 = <&pwm_gpio_pins>; | ||
| gpios = <&gpio 18 0>; /* gpio-pin = 18 */ | ||
| }; | ||
| }; | ||
| }; | ||
|
|
||
| fragment@2 { | ||
| target-path = "/"; | ||
| __overlay__ { | ||
| fan0: pwm-fan { | ||
| compatible = "pwm-fan"; | ||
| #cooling-cells = <2>; | ||
| /* in ns = 20ms = 50 Hz */ | ||
| pwms = <&pwm_gpio 0 20000000 0>; | ||
|
|
||
| cooling-min-state = <0>; | ||
| cooling-max-state = <4>; | ||
| /* PWM duty cycle values in a range from 0 to 255 */ | ||
| /* which correspond to thermal cooling states 0 to 4 */ | ||
| cooling-levels = <0 114 152 204 255>; | ||
| }; | ||
| }; | ||
| }; | ||
|
|
||
| fragment@3 { | ||
| target = <&cpu_thermal>; | ||
| __overlay__ { | ||
| /* in ms = poll every 2s */ | ||
| polling-delay = <2000>; | ||
| }; | ||
| }; | ||
|
|
||
| fragment@4 { | ||
| target = <&thermal_trips>; | ||
| __overlay__ { | ||
| /* below temperatures in millicelsius */ | ||
| trip0: trip0 { | ||
| temperature = <55000>; /* 55 °C */ | ||
| hysteresis = <5000>; /* 5 °C */ | ||
| type = "active"; | ||
| }; | ||
| trip1: trip1 { | ||
| temperature = <60000>; /* 60 °C */ | ||
| hysteresis = <5000>; /* 5 °C */ | ||
| type = "active"; | ||
| }; | ||
| trip2: trip2 { | ||
| temperature = <67500>; /* 67.5 °C */ | ||
| hysteresis = <5000>; /* 5 °C */ | ||
| type = "active"; | ||
| }; | ||
| trip3: trip3 { | ||
| temperature = <75000>; /* 75 °C */ | ||
| hysteresis = <5000>; /* 5 °C */ | ||
| type = "active"; | ||
| }; | ||
| }; | ||
| }; | ||
|
|
||
| fragment@5 { | ||
| target = <&cooling_maps>; | ||
| __overlay__ { | ||
| map0 { | ||
| cooling-device = <&fan0 0 1>; | ||
| trip = <&trip0>; | ||
| }; | ||
| map1 { | ||
| cooling-device = <&fan0 1 2>; | ||
| trip = <&trip1>; | ||
| }; | ||
| map2 { | ||
| cooling-device = <&fan0 2 3>; | ||
| trip = <&trip2>; | ||
| }; | ||
| map3 { | ||
| cooling-device = <&fan0 3 4>; | ||
| trip = <&trip3>; | ||
| }; | ||
| }; | ||
| }; | ||
|
|
||
| __overrides__ { | ||
| fan_gpio = <&pwm_gpio>,"gpios:4", | ||
| <&pwm_gpio_pins>,"brcm,pins:0"; | ||
| fan_temp0 = <&trip0>,"temperature:0"; | ||
| fan_temp0_hyst = <&trip0>,"hysteresis:0"; | ||
| fan_temp0_speed = <&fan0>,"cooling-levels:4"; | ||
| fan_temp1 = <&trip1>,"temperature:0"; | ||
| fan_temp1_hyst = <&trip1>,"hysteresis:0"; | ||
| fan_temp1_speed = <&fan0>,"cooling-levels:8"; | ||
| fan_temp2 = <&trip2>,"temperature:0"; | ||
| fan_temp2_hyst = <&trip2>,"hysteresis:0"; | ||
| fan_temp2_speed = <&fan0>,"cooling-levels:12"; | ||
| fan_temp3 = <&trip3>,"temperature:0"; | ||
| fan_temp3_hyst = <&trip3>,"hysteresis:0"; | ||
| fan_temp3_speed = <&fan0>,"cooling-levels:16"; | ||
| }; | ||
|
|
||
| }; |