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raspberrypi."4": add DigiAMP+ overlay

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Alexander Sieg 2023-10-25 14:51:48 +02:00 committed by mergify[bot]
parent 71e0de7199
commit 11d50c5d52
2 changed files with 94 additions and 0 deletions
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1
raspberry-pi/4/default.nix
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@ -15,6 +15,7 @@
./pwm0.nix
./pkgs-overlays.nix
./xhci.nix
./digi-amp-plus.nix
];
boot = {

93
raspberry-pi/4/digi-amp-plus.nix Normal file
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@ -0,0 +1,93 @@
{ config, lib, ... }:
let
cfg = config.hardware.raspberry-pi."4".digi-amp-plus;
in
{
options.hardware = {
raspberry-pi."4".digi-amp-plus = {
enable = lib.mkEnableOption ''
support for the IQaudIO DigiAMP+ Hat.
'';
unmuteAmp = lib.mkOption {
type = lib.types.bool;
default = false;
description = lib.mdDoc ''
"one-shot" unmute when kernel module first loads.
'';
};
autoMuteAmp = lib.mkOption {
type = lib.types.bool;
default = true;
description = lib.mdDoc ''
Unmute the amp when an ALSA device is opened by a client. Mute, with a five-second delay when the ALSA device is closed.
(Reopening the device within the five-second close window will cancel mute.)
'';
};
};
};
config = lib.mkIf cfg.enable {
hardware.raspberry-pi."4".apply-overlays-dtmerge.enable = lib.mkDefault true;
hardware.deviceTree = {
overlays = [
# Adapted from to: https://github.com/raspberrypi/linux/blob/3ed6d34d53e94ecbebc64c8fa3d1b6d3c41db8fb/arch/arm/boot/dts/overlays/iqaudio-dacplus-overlay.dts
# changes:
# - modified top-level "compatible" field from bcm2835 to bcm2711
# - s/i2s_clk_producer/i2s/ (name on bcm2711 platform)
{
name = "iqaudio-digiampplus-overlay";
dtsText = ''
/dts-v1/;
/plugin/;
/ {
compatible = "brcm,bcm2711";
fragment@0 {
target = <&i2s>;
__overlay__ {
status = "okay";
};
};
fragment@1 {
target = <&i2c1>;
__overlay__ {
#address-cells = <1>;
#size-cells = <0>;
status = "okay";
pcm5122@4c {
#sound-dai-cells = <0>;
compatible = "ti,pcm5122";
reg = <0x4c>;
AVDD-supply = <&vdd_3v3_reg>;
DVDD-supply = <&vdd_3v3_reg>;
CPVDD-supply = <&vdd_3v3_reg>;
status = "okay";
};
};
};
fragment@2 {
target = <&sound>;
iqaudio_dac: __overlay__ {
compatible = "iqaudio,iqaudio-dac";
i2s-controller = <&i2s>;
mute-gpios = <&gpio 22 0>;
status = "okay";
${lib.optionalString cfg.unmuteAmp "iqaudio-dac,unmute-amp;"}
${lib.optionalString cfg.autoMuteAmp "iqaudio-dac,auto-mute-amp;"}
};
};
};
'';
}
];
};
};
}