183 lines
5.6 KiB
Nix
183 lines
5.6 KiB
Nix
{ config, lib, ... }:
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let
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cfg = config.hardware.raspberry-pi."4".poe-hat;
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in {
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options.hardware = {
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raspberry-pi."4".poe-hat = {
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enable = lib.mkEnableOption ''
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support for the Raspberry Pi POE Hat.
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'';
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};
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};
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config = lib.mkIf cfg.enable {
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hardware.raspberry-pi."4".apply-overlays-dtmerge.enable = lib.mkDefault true;
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hardware.deviceTree = {
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overlays = [
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# Equivalent to: https://github.com/raspberrypi/linux/blob/rpi-6.1.y/arch/arm/boot/dts/overlays/rpi-poe-overlay.dts
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{
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name = "rpi-poe-overlay";
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dtsText = ''
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/*
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* Overlay for the Raspberry Pi POE HAT.
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*/
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/dts-v1/;
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/plugin/;
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/ {
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compatible = "brcm,bcm2835";
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fragment@0 {
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target-path = "/";
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__overlay__ {
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fan: pwm-fan {
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compatible = "pwm-fan";
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cooling-levels = <0 1 10 100 255>;
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#cooling-cells = <2>;
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pwms = <&fwpwm 0 80000>;
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};
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};
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};
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fragment@1 {
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target = <&cpu_thermal>;
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__overlay__ {
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polling-delay = <2000>; /* milliseconds */
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};
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};
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fragment@2 {
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target = <&thermal_trips>;
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__overlay__ {
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trip0: trip0 {
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temperature = <40000>;
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hysteresis = <2000>;
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type = "active";
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};
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trip1: trip1 {
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temperature = <45000>;
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hysteresis = <2000>;
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type = "active";
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};
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trip2: trip2 {
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temperature = <50000>;
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hysteresis = <2000>;
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type = "active";
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};
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trip3: trip3 {
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temperature = <55000>;
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hysteresis = <5000>;
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type = "active";
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};
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};
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};
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fragment@3 {
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target = <&cooling_maps>;
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__overlay__ {
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map0 {
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trip = <&trip0>;
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cooling-device = <&fan 0 1>;
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};
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map1 {
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trip = <&trip1>;
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cooling-device = <&fan 1 2>;
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};
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map2 {
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trip = <&trip2>;
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cooling-device = <&fan 2 3>;
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};
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map3 {
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trip = <&trip3>;
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cooling-device = <&fan 3 4>;
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};
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};
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};
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fragment@4 {
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target-path = "/__overrides__";
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params: __overlay__ {
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poe_fan_temp0 = <&trip0>,"temperature:0";
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poe_fan_temp0_hyst = <&trip0>,"hysteresis:0";
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poe_fan_temp1 = <&trip1>,"temperature:0";
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poe_fan_temp1_hyst = <&trip1>,"hysteresis:0";
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poe_fan_temp2 = <&trip2>,"temperature:0";
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poe_fan_temp2_hyst = <&trip2>,"hysteresis:0";
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poe_fan_temp3 = <&trip3>,"temperature:0";
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poe_fan_temp3_hyst = <&trip3>,"hysteresis:0";
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poe_fan_i2c = <&fwpwm>,"status=disabled",
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<&poe_mfd>,"status=okay",
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<&fan>,"pwms:0=",<&poe_mfd_pwm>;
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};
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};
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fragment@5 {
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target = <&firmware>;
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__overlay__ {
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fwpwm: pwm {
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compatible = "raspberrypi,firmware-poe-pwm";
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#pwm-cells = <2>;
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};
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};
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};
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fragment@6 {
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target = <&i2c0>;
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i2c_bus: __overlay__ {
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#address-cells = <1>;
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#size-cells = <0>;
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poe_mfd: poe@51 {
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compatible = "raspberrypi,poe-core";
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reg = <0x51>;
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status = "disabled";
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poe_mfd_pwm: poe_pwm@f0 {
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compatible = "raspberrypi,poe-pwm";
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reg = <0xf0>;
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status = "okay";
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#pwm-cells = <2>;
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};
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};
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};
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};
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fragment@7 {
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target = <&i2c0if>;
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__dormant__ {
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status = "okay";
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};
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};
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fragment@8 {
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target = <&i2c0mux>;
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__dormant__ {
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status = "okay";
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};
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};
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__overrides__ {
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poe_fan_temp0 = <&trip0>,"temperature:0";
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poe_fan_temp0_hyst = <&trip0>,"hysteresis:0";
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poe_fan_temp1 = <&trip1>,"temperature:0";
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poe_fan_temp1_hyst = <&trip1>,"hysteresis:0";
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poe_fan_temp2 = <&trip2>,"temperature:0";
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poe_fan_temp2_hyst = <&trip2>,"hysteresis:0";
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poe_fan_temp3 = <&trip3>,"temperature:0";
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poe_fan_temp3_hyst = <&trip3>,"hysteresis:0";
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i2c = <0>, "+5+6",
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<&fwpwm>,"status=disabled",
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<&i2c_bus>,"status=okay",
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<&poe_mfd>,"status=okay",
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<&fan>,"pwms:0=",<&poe_mfd_pwm>;
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};
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};
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'';
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}
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];
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};
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};
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}
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