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Allow device tree to be modified by additonal device tree sections

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This patch allows the following construct:

/ {
	property-a = "old";
	property-b = "does not change";
};

/ {
	property-a = "changed";
	property-c = "new";
	node-a {
	};
};

Where the later device tree overrides the properties found in the
earlier tree.  This is useful for laying down a template device tree
in an include file and modifying it for a specific board without having
to clone the entire tree.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Grant Likely 2010-02-25 09:58:29 -07:00 • committed by Jon Loeliger
parent 716418849a
commit 83da1b2a4e
7 changed files with 214 additions and 6 deletions
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7
tests/run_tests.sh
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@ -297,6 +297,13 @@ dtc_tests () {
done
done
# Check merge/overlay functionality
run_dtc_test -I dts -O dtb -o dtc_tree1_merge.test.dtb test_tree1_merge.dts
tree1_tests dtc_tree1_merge.test.dtb test_tree1.dtb
run_dtc_test -I dts -O dtb -o multilabel_merge.test.dtb multilabel_merge.dts
run_test references multilabel.test.dtb
run_test dtbs_equal_ordered multilabel.test.dtb multilabel_merge.test.dtb
# Check some checks
check_tests dup-nodename.dts duplicate_node_names
check_tests dup-propname.dts duplicate_property_names