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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.hardware.deviceTree;
in {
options = {
hardware.deviceTree = {
enable = mkOption {
default = pkgs.stdenv.hostPlatform.platform.kernelDTB or false;
type = types.bool;
description = ''
Build device tree files. These are used to describe the
non-discoverable hardware of a system.
'';
};
base = mkOption {
default = "${config.boot.kernelPackages.kernel}/dtbs";
defaultText = "\${config.boot.kernelPackages.kernel}/dtbs";
example = literalExample "pkgs.device-tree_rpi";
type = types.path;
description = ''
The path containing the base device-tree (.dtb) to boot. Contains
device trees bundled with the Linux kernel by default.
'';
};
name = mkOption {
default = null;
example = "some-dtb.dtb";
type = types.nullOr types.str;
description = ''
The name of an explicit dtb to be loaded, relative to the dtb base.
Useful in extlinux scenarios if the bootloader doesn't pick the
right .dtb file from FDTDIR.
'';
};
overlays = mkOption {
default = [];
example = literalExample
"[\"\${pkgs.device-tree_rpi.overlays}/w1-gpio.dtbo\"]";
type = types.listOf types.path;
description = ''
A path containing device tree overlays (.dtbo) to be applied to all
base device-trees.
'';
};
package = mkOption {
default = null;
type = types.nullOr types.path;
internal = true;
description = ''
A path containing the result of applying `overlays` to `base`.
'';
};
};
};
config = mkIf (cfg.enable) {
hardware.deviceTree.package = if (cfg.overlays != [])
then pkgs.deviceTree.applyOverlays cfg.base cfg.overlays else cfg.base;
};
}