feat: add backlight support for rpi4

This commit is contained in:
louib 2023-03-25 19:38:01 -04:00
parent f38f9a4c9b
commit 160e7e12d7
2 changed files with 53 additions and 1 deletions

View file

@ -0,0 +1,50 @@
{ config, lib, ... }:
let
cfg = config.hardware.raspberry-pi."4".backlight;
in
{
options.hardware = {
raspberry-pi."4".backlight = {
enable = lib.mkEnableOption ''
Enable the backlight support for the Raspberry Pi official Touch Display
'';
};
};
config = lib.mkIf cfg.enable {
hardware.deviceTree = {
overlays = [
# This overlay was originally taken from:
# https://github.com/raspberrypi/linux/blob/rpi-5.15.y/arch/arm/boot/dts/overlays/rpi-backlight-overlay.dts
# The only modification made was to change the compatible field to bcm2711
{
name = "rpi-backlight-overlay";
dtsText = ''
/*
* Devicetree overlay for mailbox-driven Raspberry Pi DSI Display
* backlight controller
*/
/dts-v1/;
/plugin/;
/ {
compatible = "brcm,bcm2711";
fragment@0 {
target-path = "/";
__overlay__ {
rpi_backlight: rpi_backlight {
compatible = "raspberrypi,rpi-backlight";
firmware = <&firmware>;
status = "okay";
};
};
};
};
'';
}
];
};
};
}

View file

@ -1,8 +1,9 @@
{ lib, pkgs, ...}: { lib, pkgs, ... }:
{ {
imports = [ imports = [
./audio.nix ./audio.nix
./backlight.nix
./cpu-revision.nix ./cpu-revision.nix
./dwc2.nix ./dwc2.nix
./i2c.nix ./i2c.nix
@ -22,6 +23,7 @@
"vc4" "vc4"
"pcie_brcmstb" # required for the pcie bus to work "pcie_brcmstb" # required for the pcie bus to work
"reset-raspberrypi" # required for vl805 firmware to load "reset-raspberrypi" # required for vl805 firmware to load
"rpi_backlight" # required for backlight support
]; ];
loader = { loader = {