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nixos/device-tree: Allow custom dtbSource and expose compileDts

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This commit is contained in:
ktrinh 2023-09-24 11:58:13 -07:00
parent 48516a891d
commit 8da771560c
2 changed files with 71 additions and 20 deletions
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66
nixos/modules/hardware/device-tree.nix
View File

@ -66,36 +66,32 @@ let
};
filterDTBs = src: if cfg.filter == null
then "${src}/dtbs"
then src
else
pkgs.runCommand "dtbs-filtered" {} ''
mkdir -p $out
cd ${src}/dtbs
cd ${src}
find . -type f -name '${cfg.filter}' -print0 \
| xargs -0 cp -v --no-preserve=mode --target-directory $out --parents
'';
filteredDTBs = filterDTBs cfg.kernelPackage;
# Compile single Device Tree overlay source
# file (.dts) into its compiled variant (.dtbo)
compileDTS = name: f: pkgs.callPackage({ stdenv, dtc }: stdenv.mkDerivation {
name = "${name}-dtbo";
nativeBuildInputs = [ dtc ];
buildCommand = ''
$CC -E -nostdinc -I${getDev cfg.kernelPackage}/lib/modules/${cfg.kernelPackage.modDirVersion}/source/scripts/dtc/include-prefixes -undef -D__DTS__ -x assembler-with-cpp ${f} | \
dtc -I dts -O dtb -@ -o $out
'';
}) {};
filteredDTBs = filterDTBs cfg.dtbSource;
# Fill in `dtboFile` for each overlay if not set already.
# Existence of one of these is guarded by assertion below
withDTBOs = xs: flip map xs (o: o // { dtboFile =
let
includePaths = ["${getDev cfg.kernelPackage}/lib/modules/${cfg.kernelPackage.modDirVersion}/source/scripts/dtc/include-prefixes"] ++ cfg.dtboBuildExtraIncludePaths;
extraPreprocessorFlags = cfg.dtboBuildExtraPreprocessorFlags;
in
if o.dtboFile == null then
if o.dtsFile != null then compileDTS o.name o.dtsFile
else compileDTS o.name (pkgs.writeText "dts" o.dtsText)
let
dtsFile = if o.dtsFile == null then (pkgs.writeText "dts" o.dtsText) else o.dtsFile;
in
pkgs.deviceTree.compileDTS {
name = "${o.name}-dtbo";
inherit includePaths extraPreprocessorFlags dtsFile;
}
else o.dtboFile; } );
in
@ -121,7 +117,39 @@ in
example = literalExpression "pkgs.linux_latest";
type = types.path;
description = lib.mdDoc ''
Kernel package containing the base device-tree (.dtb) to boot. Uses
Kernel package where device tree include directory is from. Also used as default source of dtb package to apply overlays to
'';
};
dtboBuildExtraPreprocessorFlags = mkOption {
default = [];
example = literalExpression "[ \"-DMY_DTB_DEFINE\" ]";
type = types.listOf types.str;
description = lib.mdDoc ''
Additional flags to pass to the preprocessor during dtbo compilations
'';
};
dtboBuildExtraIncludePaths = mkOption {
default = [];
example = literalExpression ''
[
./my_custom_include_dir_1
./custom_include_dir_2
]
'';
type = types.listOf types.path;
description = lib.mdDoc ''
Additional include paths that will be passed to the preprocessor when creating the final .dts to compile into .dtbo
'';
};
dtbSource = mkOption {
default = "${cfg.kernelPackage}/dtbs";
defaultText = literalExpression "\${cfg.kernelPackage}/dtbs";
type = types.path;
description = lib.mdDoc ''
Path to dtb directory that overlays and other processing will be applied to. Uses
device trees bundled with the Linux kernel by default.
'';
};

25
pkgs/os-specific/linux/device-tree/default.nix
View File

@ -1,6 +1,29 @@
{ lib, stdenvNoCC, dtc }:
{ lib, stdenv, stdenvNoCC, dtc }:
with lib; {
# 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 = [ dtc ];