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https://github.com/NixOS/nixos-hardware
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raspberry-pi/4/i2c1: factor out easy dts into helper, add i2c0
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parent
e81c9aed16
commit
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4 changed files with 47 additions and 22 deletions
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@ -4,6 +4,7 @@
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imports = [
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./audio.nix
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./dwc2.nix
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./i2c0.nix
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./i2c1.nix
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./modesetting.nix
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./poe-hat.nix
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25
raspberry-pi/4/i2c0.nix
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25
raspberry-pi/4/i2c0.nix
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@ -0,0 +1,25 @@
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{ config, lib, pkgs, ... }:
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let
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cfg = config.hardware.raspberry-pi."4".i2c0;
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inherit (import ./overlay.nix) simple-pi4-overlay;
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in
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{
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options.hardware = {
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raspberry-pi."4".i2c0 = {
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enable = lib.mkEnableOption ''
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Turn on the VideoCore I2C bus (maps to /dev/i2c-22) and enable access from the i2c group.
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After a reboot, i2c-tools (e.g. i2cdetect -F 22) should work for root or any user in i2c.
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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 = {
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i2c.enable = lib.mkDefault true;
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deviceTree = {
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overlays = [ (simple-pi4-overlay { target = "i2c0if"; status = "okay"; }) ];
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};
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};
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};
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}
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@ -2,6 +2,7 @@
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let
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cfg = config.hardware.raspberry-pi."4".i2c1;
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inherit (import ./overlay.nix) simple-pi4-overlay;
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in
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{
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options.hardware = {
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@ -15,29 +16,9 @@ in
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config = lib.mkIf cfg.enable {
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hardware = {
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i2c.enable = true;
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i2c.enable = lib.mkDefault true;
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deviceTree = {
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overlays = [
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# Equivalent to dtparam=i2c1=on
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{
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name = "i2c1-on-overlay";
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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 = <&i2c1>;
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__overlay__ {
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#address-cells = <1>;
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#size-cells = <0>;
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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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overlays = [ (simple-pi4-overlay { target = "i2c1"; status = "okay"; }) ];
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};
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};
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};
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18
raspberry-pi/4/overlay.nix
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18
raspberry-pi/4/overlay.nix
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@ -0,0 +1,18 @@
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{
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simple-pi4-overlay = { target, status }: {
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name = "${target}-${status}-overlay";
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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 = <&${target}>;
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__overlay__ {
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status = "${status}";
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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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