There exists a syntactic sugar version of overlays which
make them simpler to write for the trivial case of a single target.
Document it in the device tree object internals.
Signed-off-by: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx>
---
Documentation/dt-object-internal.txt | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/Documentation/dt-object-internal.txt b/Documentation/dt-object-internal.txt
index 51d68ab..624aa43 100644
--- a/Documentation/dt-object-internal.txt
+++ b/Documentation/dt-object-internal.txt
@@ -308,3 +308,20 @@ the run time loader must apply an offset to each phandle in every dynamic
DT object loaded. The __local_fixups__ node records the offset relative to the
start of every local reference within that property so that the loader can apply
the offset.
+
+There is an alternative syntax to the expanded form for overlays with phandle
+targets which makes the format similar to the one using in .dtsi include files.
+
+So for the &ocp target example above one can simply write:
+
+/dts-v1/;
+/plugin/;
+&ocp {
+ /* bar peripheral */
+ bar {
+ compatible = "corp,bar";
+ ... /* various properties and child nodes */
+ }
+};
+
+The resulting dtb object is identical.
--
2.1.4
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