52 lines
1.4 KiB
Nix
52 lines
1.4 KiB
Nix
{ config, lib, ... }:
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let
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cfg = config.hardware.raspberry-pi."4".backlight;
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in
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{
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options.hardware = {
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raspberry-pi."4".backlight = {
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enable = lib.mkEnableOption ''
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Enable the backlight support for the Raspberry Pi official Touch Display
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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.deviceTree = {
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overlays = [
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# This overlay was originally taken from:
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# https://github.com/raspberrypi/linux/blob/rpi-6.1.y/arch/arm/boot/dts/overlays/rpi-backlight-overlay.dts
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# The only modification made was to change the compatible field to bcm2711
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# this is the same as for the 5.15.y kernel
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{
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name = "rpi-backlight-overlay";
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dtsText = ''
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/*
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* Devicetree overlay for mailbox-driven Raspberry Pi DSI Display
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* backlight controller
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*/
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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-path = "/";
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__overlay__ {
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rpi_backlight: rpi_backlight {
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compatible = "raspberrypi,rpi-backlight";
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firmware = <&firmware>;
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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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