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poe-hat.nix
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poe-hat.nix
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{ config, lib, ... }:
let
cfg = config.hardware.raspberry-pi."4".poe-hat;
in {
options.hardware = {
raspberry-pi."4".poe-hat = {
enable = lib.mkEnableOption ''
support for the Raspberry Pi POE Hat.
'';
};
};
config = lib.mkIf cfg.enable {
hardware.raspberry-pi."4".apply-overlays-dtmerge.enable = lib.mkDefault true;
# doesn't work for the CM module, so we exclude e.g. bcm2711-rpi-cm4.dts
hardware.deviceTree.filter = "bcm2711-rpi-4*.dtb";
hardware.deviceTree = {
overlays = [
# Equivalent to: https://github.com/raspberrypi/linux/blob/rpi-6.1.y/arch/arm/boot/dts/overlays/rpi-poe-overlay.dts
{
name = "rpi-poe-overlay";
dtsText = ''
/*
* Overlay for the Raspberry Pi POE HAT.
*/
/dts-v1/;
/plugin/;
/ {
compatible = "brcm,bcm2711";
fragment@0 {
target-path = "/";
__overlay__ {
fan: pwm-fan {
compatible = "pwm-fan";
cooling-levels = <0 1 10 100 255>;
#cooling-cells = <2>;
pwms = <&fwpwm 0 80000>;
};
};
};
fragment@1 {
target = <&cpu_thermal>;
__overlay__ {
polling-delay = <2000>; /* milliseconds */
};
};
fragment@2 {
target = <&thermal_trips>;
__overlay__ {
trip0: trip0 {
temperature = <40000>;
hysteresis = <2000>;
type = "active";
};
trip1: trip1 {
temperature = <45000>;
hysteresis = <2000>;
type = "active";
};
trip2: trip2 {
temperature = <50000>;
hysteresis = <2000>;
type = "active";
};
trip3: trip3 {
temperature = <55000>;
hysteresis = <5000>;
type = "active";
};
};
};
fragment@3 {
target = <&cooling_maps>;
__overlay__ {
map0 {
trip = <&trip0>;
cooling-device = <&fan 0 1>;
};
map1 {
trip = <&trip1>;
cooling-device = <&fan 1 2>;
};
map2 {
trip = <&trip2>;
cooling-device = <&fan 2 3>;
};
map3 {
trip = <&trip3>;
cooling-device = <&fan 3 4>;
};
};
};
fragment@4 {
target-path = "/__overrides__";
params: __overlay__ {
poe_fan_temp0 = <&trip0>,"temperature:0";
poe_fan_temp0_hyst = <&trip0>,"hysteresis:0";
poe_fan_temp1 = <&trip1>,"temperature:0";
poe_fan_temp1_hyst = <&trip1>,"hysteresis:0";
poe_fan_temp2 = <&trip2>,"temperature:0";
poe_fan_temp2_hyst = <&trip2>,"hysteresis:0";
poe_fan_temp3 = <&trip3>,"temperature:0";
poe_fan_temp3_hyst = <&trip3>,"hysteresis:0";
poe_fan_i2c = <&fwpwm>,"status=disabled",
<&poe_mfd>,"status=okay",
<&fan>,"pwms:0=",<&poe_mfd_pwm>;
};
};
fragment@5 {
target = <&firmware>;
__overlay__ {
fwpwm: pwm {
compatible = "raspberrypi,firmware-poe-pwm";
#pwm-cells = <2>;
};
};
};
fragment@6 {
target = <&i2c0>;
i2c_bus: __overlay__ {
#address-cells = <1>;
#size-cells = <0>;
poe_mfd: poe@51 {
compatible = "raspberrypi,poe-core";
reg = <0x51>;
status = "disabled";
poe_mfd_pwm: poe_pwm@f0 {
compatible = "raspberrypi,poe-pwm";
reg = <0xf0>;
status = "okay";
#pwm-cells = <2>;
};
};
};
};
fragment@7 {
target = <&i2c0if>;
__dormant__ {
status = "okay";
};
};
fragment@8 {
target = <&i2c0mux>;
__dormant__ {
status = "okay";
};
};
__overrides__ {
poe_fan_temp0 = <&trip0>,"temperature:0";
poe_fan_temp0_hyst = <&trip0>,"hysteresis:0";
poe_fan_temp1 = <&trip1>,"temperature:0";
poe_fan_temp1_hyst = <&trip1>,"hysteresis:0";
poe_fan_temp2 = <&trip2>,"temperature:0";
poe_fan_temp2_hyst = <&trip2>,"hysteresis:0";
poe_fan_temp3 = <&trip3>,"temperature:0";
poe_fan_temp3_hyst = <&trip3>,"hysteresis:0";
i2c = <0>, "+5+6",
<&fwpwm>,"status=disabled",
<&i2c_bus>,"status=okay",
<&poe_mfd>,"status=okay",
<&fan>,"pwms:0=",<&poe_mfd_pwm>;
};
};
'';
}
];
};
};
}