596: feat: add backlight support for rpi4 r=Mic92 a=louib



Co-authored-by: louib <code@louib.net>
This commit is contained in:
bors[bot] 2023-03-27 19:06:29 +00:00 committed by GitHub
commit b13f2e1bc2
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2 changed files with 53 additions and 1 deletions

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@ -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";
};
};
};
};
'';
}
];
};
};
}

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