56 lines
1.4 KiB
Nix
56 lines
1.4 KiB
Nix
{
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config,
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lib,
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...
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}: let
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inherit (lib) mkEnableOption mkIf mkMerge;
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cfg = config.hardware.raspberry-pi."4".overlays;
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in {
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options.hardware = {
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raspberry-pi."4".overlays.spi-gpio40-45.enable = mkEnableOption ''spi-gpio40-45 enable '';
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};
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config = mkMerge [
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(mkIf cfg.spi-gpio40-45.enable {
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hardware.deviceTree = {
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overlays = [
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{
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name = "spi-gpio40-45.overlay";
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filter = "*rpi-cm4*";
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dtsText = ''
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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 = <&spi0>;
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__overlay__ {
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cs-gpios = <&gpio 43 1>, <&gpio 44 1>, <&gpio 45 1>;
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status = "okay";
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};
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};
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fragment@1 {
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target = <&spi0_cs_pins>;
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__overlay__ {
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brcm,pins = <45 44 43>;
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brcm,function = <1>; /* output */
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status = "okay";
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};
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};
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fragment@2 {
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target = <&spi0_pins>;
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__overlay__ {
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brcm,pins = <40 41 42>;
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brcm,function = <3>; /* alt4 */
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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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