45 lines
1 KiB
Nix
45 lines
1 KiB
Nix
{ config, lib, pkgs, ... }:
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let
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cfg = config.hardware.raspberry-pi."4".i2c1;
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in
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{
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options.hardware = {
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raspberry-pi."4".i2c1 = {
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enable = lib.mkEnableOption ''
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Turn on the ARM I2C bus (/dev/i2c-1 on GPIO pins 3 and 5) and enable access from the i2c group.
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After a reboot, i2c-tools (e.g. i2cdetect -F 1) 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 = 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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};
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};
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};
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}
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