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Add rpi4 pwm0 support

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ettom 2022-02-21 22:06:43 +02:00
parent 1ccfe243aa
commit 1c076b237f
2 changed files with 51 additions and 0 deletions
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1
raspberry-pi/4/default.nix
View file

@ -8,6 +8,7 @@
./modesetting.nix
./poe-hat.nix
./tc358743.nix
./pwm0.nix
];
boot = {

50
raspberry-pi/4/pwm0.nix Normal file
View file

@ -0,0 +1,50 @@
{ config, lib, pkgs, ... }:
let
cfg = config.hardware.raspberry-pi."4".pwm0;
in
{
options.hardware = {
raspberry-pi."4".pwm0 = {
enable = lib.mkEnableOption ''
Enable support for the hardware pwm0 channel on GPIO_18
'';
};
};
config = lib.mkIf cfg.enable {
hardware.deviceTree = {
overlays = [{
name = "pwm-overlay";
dtsText = ''
/dts-v1/;
/plugin/;
/ {
compatible = "brcm,bcm2711";
fragment@0 {
target = <&gpio>;
__overlay__ {
pwm_pins: pwm_pins {
brcm,pins = <18>;
brcm,function = <2>; /* Alt5 */
};
};
};
fragment@1 {
target = <&pwm>;
__overlay__ {
pinctrl-names = "default";
assigned-clock-rates = <100000000>;
status = "okay";
pinctrl-0 = <&pwm_pins>;
};
};
};
'';
}];
};
};
}