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mjallen18
@@ -0,0 +1,67 @@
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# modification of nixpkgs deviceTree.applyOverlays to resolve https://github.com/NixOS/nixpkgs/issues/125354
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# derived from https://github.com/NixOS/nixpkgs/blob/916ca8f2b0c208def051f8ea9760c534a40309db/pkgs/os-specific/linux/device-tree/default.nix
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{
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lib,
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stdenvNoCC,
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dtc,
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libraspberrypi,
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}:
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with lib;
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(
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base: overlays':
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stdenvNoCC.mkDerivation {
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name = "device-tree-overlays";
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nativeBuildInputs = [
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dtc
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libraspberrypi
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];
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buildCommand =
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let
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overlays = toList overlays';
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in
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''
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mkdir -p $out
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cd "${base}"
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find . -type f -name '*.dtb' -print0 \
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| xargs -0 cp -v --no-preserve=mode --target-directory "$out" --parents
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for dtb in $(find "$out" -type f -name '*.dtb'); do
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dtbCompat=$(fdtget -t s "$dtb" / compatible 2>/dev/null || true)
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# skip files without `compatible` string
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test -z "$dtbCompat" && continue
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${flip (concatMapStringsSep "\n") overlays (o: ''
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overlayCompat="$(fdtget -t s "${o.dtboFile}" / compatible)"
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# skip incompatible and non-matching overlays
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if [[ ! "$dtbCompat" =~ "$overlayCompat" ]]; then
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echo "Skipping overlay ${o.name}: incompatible with $(basename "$dtb")"
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elif ${
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if ((o.filter or null) == null) then
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"false"
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else
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''
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[[ "''${dtb//${o.filter}/}" == "$dtb" ]]
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''
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}
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then
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echo "Skipping overlay ${o.name}: filter does not match $(basename "$dtb")"
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else
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echo -n "Applying overlay ${o.name} to $(basename "$dtb")... "
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mv "$dtb"{,.in}
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# dtmerge requires a .dtbo ext for dtbo files, otherwise it adds it to the given file implicitly
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dtboWithExt="$TMPDIR/$(basename "${o.dtboFile}").dtbo"
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cp -r ${o.dtboFile} "$dtboWithExt"
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dtmerge "$dtb.in" "$dtb" "$dtboWithExt"
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echo "ok"
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rm "$dtb.in" "$dtboWithExt"
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fi
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'')}
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done'';
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}
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)
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@@ -7,6 +7,11 @@
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}:
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let
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cfg = config.${namespace}.hardware.raspberry-pi;
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dt_ao_overlay = _final: prev: {
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deviceTree = prev.deviceTree // {
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applyOverlays = _final.callPackage ./apply-overlays-dtmerge.nix { };
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};
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};
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in
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{
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options.${namespace}.hardware.raspberry-pi = {
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@@ -19,13 +24,40 @@ in
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];
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description = "Raspberry Pi variant (4 or 5)";
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};
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apply-overlays-dtmerge = {
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enable = lib.mkEnableOption "" // {
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description = ''
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Whether replace deviceTree.applyOverlays implementation to use dtmerge from libraspberrypi.
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This can resolve issues with applying dtbs for the pi.
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'';
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};
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};
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};
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imports = [
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./leds.nix
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];
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config = lib.mkIf cfg.enable {
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boot.initrd.availableKernelModules = lib.mkIf (cfg.variant == "5") [
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"nvme"
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];
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boot = {
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initrd.availableKernelModules = [
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"usbhid"
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"usb-storage"
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] ++ (if (cfg.variant == "5") then [
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"nvme"
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] else
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[
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"vc4"
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"pcie-brcmstb" # required for the pcie bus to work
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"reset-raspberrypi" # required for vl805 firmware to load
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]);
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loader = {
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generic-extlinux-compatible.enable = lib.mkDefault true;
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grub.enable = lib.mkForce false;
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};
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};
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# Common Raspberry Pi packages
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environment.systemPackages = with pkgs; [
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@@ -58,21 +90,65 @@ in
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# Common hardware settings
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hardware = {
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i2c.enable = lib.mkDefault true;
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deviceTree = {
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filter = lib.mkDefault (if (cfg.variant == "5") then "bcm2712-rpi-*.dtb" else "bcm2711-rpi-*.dtb");
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overlays = lib.mkIf (cfg.variant == "4") [
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{
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name = "rpi4-cpu-revision";
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dtsText = ''
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/dts-v1/;
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/plugin/;
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/ {
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compatible = "raspberrypi,4-model-b";
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fragment@0 {
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target-path = "/";
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__overlay__ {
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system {
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linux,revision = <0x00d03114>;
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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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name = "enable-xhci";
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dtsText = ''
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/dts-v1/;
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/plugin/;
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/ {
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compatible = "brcm,bcm2711";
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fragment@0 {
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//target-path = "/scb/xhci@7e9c0000";
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target = <&xhci>;
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__overlay__ {
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status = "okay";
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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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firmware = [ pkgs.${namespace}.raspberryPiWirelessFirmware ];
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graphics.enable32Bit = lib.mkForce false;
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i2c.enable = lib.mkDefault true;
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};
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# Pi specific system tags
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system.nixos.tags = (
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let
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bootCfg = config.boot.loader.raspberry-pi;
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in
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[
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"raspberry-pi-${bootCfg.variant}"
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bootCfg.bootloader
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config.boot.kernelPackages.kernel.version
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]
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);
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# system.nixos.tags = (
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# let
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# bootCfg = config.boot.loader.raspberry-pi;
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# in
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# [
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# "raspberry-pi-${bootCfg.variant}"
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# bootCfg.bootloader
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# config.boot.kernelPackages.kernel.version
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# ]
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# );
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# Common programs
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programs.kdeconnect.enable = lib.mkDefault false;
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@@ -164,6 +240,7 @@ in
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++ [ "${pageSizeFlag}=14" ];
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});
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})
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] else [ ]);
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] else [ ])
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++ (if cfg.apply-overlays-dtmerge.enable then [ dt_ao_overlay ] else [ ]);
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};
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}
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132
modules/nixos/hardware/raspberry-pi/leds.nix
Normal file
132
modules/nixos/hardware/raspberry-pi/leds.nix
Normal file
@@ -0,0 +1,132 @@
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{ config, lib, namespace, ... }:
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let
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cfg = config.${namespace}.hardware.raspberry-pi.leds;
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mkDisableOption =
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name:
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lib.mkOption {
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default = false;
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example = true;
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description = "Whether to disable ${name}.";
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type = lib.types.bool;
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};
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in
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{
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options.${namespace}.hardware = {
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raspberry-pi.leds = {
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eth.disable = mkDisableOption ''ethernet LEDs.'';
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act.disable = mkDisableOption ''activity LED.'';
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pwr.disable = mkDisableOption ''power LED.'';
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};
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};
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# Adapted from: https://gist.github.com/SFrijters/206d2c09656affb04284f076c75a1969
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config = lib.mkMerge [
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(lib.mkIf (cfg.eth.disable || cfg.act.disable || cfg.pwr.disable) {
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${namespace}.hardware.raspberry-pi.apply-overlays-dtmerge.enable = lib.mkDefault true;
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hardware.deviceTree.filter = "*-rpi-4-*.dtb";
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})
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(lib.mkIf cfg.eth.disable {
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hardware.deviceTree = {
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overlays = [
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# https://github.com/raspberrypi/firmware/blob/master/boot/overlays/README
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# eth_led0 Set mode of LED0 - amber on Pi3B+ (default "1"),
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# green on Pi4 (default "0").
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# The legal values are:
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#
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# Pi4
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#
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# 0=Speed/Activity 1=Speed
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# 2=Flash activity 3=FDX
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# 4=Off 5=On
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# 6=Alt 7=Speed/Flash
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# 8=Link 9=Activity
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#
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# Debugging:
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# $ hexdump /proc/device-tree/scb/ethernet@7d580000/mdio@e14/ethernet-phy@1/led-modes
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{
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name = "disable-eth-leds";
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filter = "*rpi-4-b*";
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dtsText = ''
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/dts-v1/;
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/plugin/;
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/{
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compatible = "raspberrypi,4-model-b";
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fragment@0 {
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target = <&phy1>;
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__overlay__ {
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led-modes = <0x04 0x04>;
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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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(lib.mkIf cfg.act.disable {
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hardware.deviceTree = {
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overlays = [
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# Debugging:
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# $ hexdump /proc/device-tree/leds/led-act/gpios
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# $ cat /proc/device-tree/leds/led-act/linux,default-trigger
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{
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name = "disable-act-led";
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filter = "*rpi-4-b*";
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dtsText =
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let
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kernelVersion = lib.versionAtLeast config.boot.kernelPackages.kernel.version "6.2";
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target = if kernelVersion then "<&led_act>" else "<&act_led>";
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in
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''
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/dts-v1/;
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/plugin/;
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/{
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compatible = "raspberrypi,4-model-b";
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fragment@0 {
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target = ${target};
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__overlay__ {
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gpios = <&gpio 42 0>; /* first two values copied from bcm2711-rpi-4-b.dts */
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linux,default-trigger = "none";
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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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(lib.mkIf cfg.pwr.disable {
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hardware.deviceTree = {
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overlays = [
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# Debugging:
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# $ hexdump /proc/device-tree/leds/led-pwr/gpios
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# $ cat /proc/device-tree/leds/led-pwr/linux,default-trigger
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{
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name = "disable-pwr-led";
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filter = "*rpi-4-b*";
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dtsText =
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let
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kernelVersion = lib.versionAtLeast config.boot.kernelPackages.kernel.version "6.2";
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target = if kernelVersion then "<&led_pwr>" else "<&pwr_led>";
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in
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''
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/dts-v1/;
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/plugin/;
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/{
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compatible = "raspberrypi,4-model-b";
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fragment@0 {
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target = ${target};
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__overlay__ {
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gpios = <&expgpio 2 0>; /* first two values copied from bcm2711-rpi-4-b.dts */
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linux,default-trigger = "default-on";
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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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];
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}
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