#! /bin/bash

# SPDX-License-Identifier: GPL-2.0-or-later

# This script uses the bash <(...) extension.

# If you want to change this to work with a generic /bin/sh, make sure

# you fix that.

DTC=dtc

source_and_sort () {

    DT="$1"

    if [ -d "$DT" ]; then

	IFORMAT=fs

    elif [ -f "$DT" ]; then

	case "$DT" in

	    *.dts)

		IFORMAT=dts

		;;

	    *.dtb)

		IFORMAT=dtb

		;;

	esac

    fi

    if [ -z "$IFORMAT" ]; then

	echo "Unrecognized format for $DT" >&2

	exit 2

    fi

    $DTC -I $IFORMAT -O dts -qq -f -s -o - "$DT"

}

if [ $# != 2 ]; then

    echo "Usage: dtdiff <device tree> <device tree>" >&2

    exit 1

fi

diff -u <(source_and_sort "$1") <(source_and_sort "$2")