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Nixos: Device Tree Overlay on Raspberry PI CM4
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| { | |
| description = "Base system for raspberry pi 4"; | |
| inputs = { | |
| nixpkgs.url = "nixpkgs/nixos-unstable"; | |
| nixos-hardware.url = "nixos-hardware/master"; | |
| nixos-generators = { | |
| url = "github:nix-community/nixos-generators"; | |
| inputs.nixpkgs.follows = "nixpkgs"; | |
| }; | |
| }; | |
| outputs = { self, nixpkgs, nixos-hardware, nixos-generators, ... }: | |
| let | |
| pkgs = import nixpkgs { system = "aarch64-linux"; }; | |
| in | |
| { | |
| nixosModules = { | |
| system = { | |
| boot = { | |
| kernelPatches = [ | |
| { | |
| name = "mcp4728-config"; | |
| patch = null; | |
| structuredExtraConfig = with pkgs.lib.kernel; { | |
| DAC_MCP4728 = yes; | |
| }; | |
| } | |
| ]; | |
| kernelParams = [ | |
| "console=serial0,115200n8" | |
| ]; | |
| kernelPackages = pkgs.linuxPackages_rpi4; | |
| }; | |
| fileSystems = { | |
| "/" = { | |
| device = "/dev/disk/by-label/NIXOS_SD"; | |
| fsType = "ext4"; | |
| }; | |
| }; | |
| hardware = { | |
| enableRedistributableFirmware = true; | |
| deviceTree = { | |
| kernelPackage = pkgs.linux_rpi4; | |
| overlays = [ | |
| { name = "ad7616"; dtsFile = ./ad7616.dts; } | |
| { name = "mcp4728"; dtsFile = ./mcp4728.dts; } | |
| { name = "mcp3208"; dtsFile = ./mcp3208.dts; } | |
| { name = "spi6-1cs"; dtboFile = "${pkgs.device-tree_rpi.overlays}/spi6-1cs.dtbo"; } | |
| ]; | |
| }; | |
| }; | |
| nix.gc = { | |
| automatic = true; | |
| dates = "daily"; | |
| }; | |
| environment.systemPackages = with pkgs; [ | |
| raspberrypifw | |
| libraspberrypi | |
| raspberrypi-eeprom | |
| libiio | |
| neovim | |
| ]; | |
| services = { | |
| avahi.enable = true; | |
| openssh.enable = true; | |
| cron.enable = true; | |
| udev.extraRules = '' | |
| KERNEL=="gpiochip[0-9]*", KERNELS=="1-0023", SUBSYSTEM=="gpio", SUBSYSTEMS=="i2c", ATTRS{name}=="mcp23017", SYMLINK+="gpioexp0" | |
| KERNEL=="gpiochip[0-9]*", KERNELS=="1-0024", SUBSYSTEM=="gpio", SUBSYSTEMS=="i2c", ATTRS{name}=="mcp23017", SYMLINK+="gpioexp1" | |
| KERNEL=="iio:device[0-9]*", SUBSYSTEM=="iio", RUN+="/bin/sh -c 'chgrp -R iio /sys%p; chmod -R g=u /sys%p'" | |
| KERNEL=="spidev*", GROUP="spi", MODE="0660" | |
| ''; | |
| }; | |
| networking = { | |
| networkmanager.enable = true; | |
| hostName = "nixpi"; | |
| }; | |
| # Disabling the whole `profiles/base.nix` module, which is responsible | |
| # for adding ZFS and a bunch of other unnecessary programs: | |
| disabledModules = [ | |
| "profiles/base.nix" | |
| ]; | |
| system.stateVersion = "24.05"; | |
| }; | |
| users = { | |
| users.users.pi = { | |
| isNormalUser = true; | |
| extraGroups = [ "wheel" "iio" "spi" ]; # Add user to the wheel group for sudo access | |
| }; | |
| users.groups = { | |
| spi = { }; | |
| iio = { }; | |
| }; | |
| }; | |
| }; | |
| packages.aarch64-linux = { | |
| sdcard = nixos-generators.nixosGenerate { | |
| system = "aarch64-linux"; | |
| format = "sd-aarch64"; | |
| modules = [ | |
| nixos-hardware.nixosModules.raspberry-pi-4 | |
| self.nixosModules.system | |
| self.nixosModules.users | |
| ]; | |
| }; | |
| }; | |
| }; | |
| } |
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| /dts-v1/; | |
| /plugin/; | |
| / { | |
| compatible = "brcm,bcm2711"; | |
| fragment@0 { | |
| target = <&i2c1>; | |
| __overlay__ { | |
| status = "okay"; | |
| }; | |
| }; | |
| fragment@1 { | |
| target = <&i2c1>; | |
| __overlay__ { | |
| /* needed to avoid dtc warning */ | |
| #address-cells = <1>; | |
| #size-cells = <0>; | |
| mcp4728: dac@60 { | |
| compatible = "microchip,mcp4728"; | |
| reg = <0x60>; | |
| vdd-supply = <&vdd_5v0_reg>; | |
| label = "mcp4728"; | |
| }; | |
| }; | |
| }; | |
| __overrides__ { | |
| addr = <&mcp4728>,"reg:0"; | |
| label = <&mcp4728>,"label"; | |
| }; | |
| }; |
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