depot/third_party/nixpkgs/pkgs/os-specific/linux/device-tree/default.nix

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{ lib, stdenv, stdenvNoCC, dtc, writers, python3 }:
{
# Compile single Device Tree overlay source
# file (.dts) into its compiled variant (.dtb)
compileDTS = ({
name,
dtsFile,
includePaths ? [],
extraPreprocessorFlags ? []
}: stdenv.mkDerivation {
inherit name;
nativeBuildInputs = [ dtc ];
buildCommand =
let
includeFlagsStr = lib.concatMapStringsSep " " (includePath: "-I${includePath}") includePaths;
extraPreprocessorFlagsStr = lib.concatStringsSep " " extraPreprocessorFlags;
in
''
$CC -E -nostdinc ${includeFlagsStr} -undef -D__DTS__ -x assembler-with-cpp ${extraPreprocessorFlagsStr} ${dtsFile} | \
dtc -I dts -O dtb -@ -o $out
'';
});
applyOverlays = (base: overlays': stdenvNoCC.mkDerivation {
name = "device-tree-overlays";
nativeBuildInputs = [
(python3.pythonOnBuildForHost.withPackages(ps: [ps.libfdt]))
];
buildCommand = ''
python ${./apply_overlays.py} --source ${base} --destination $out --overlays ${writers.writeJSON "overlays.json" overlays'}
'';
});
}