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Date:	Mon, 16 May 2016 23:18:09 +0300
From:	Pantelis Antoniou <>
To:	Rob Herring <>
Cc:	Frank Rowand <>,
	Matt Porter <>,
	Grant Likely <>,
	Koen Kooi <>,
	Guenter Roeck <>,
	Marek Vasut <>,,,
	Pantelis Antoniou <>,
	Pantelis Antoniou <>
Subject: [PATCH v2 3/6] doc: dt: Document the indirect overlay method.

Add a description of the target index overlay method to the overlay
documention file.

Signed-off-by: Pantelis Antoniou <>
 Documentation/devicetree/overlay-notes.txt | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/overlay-notes.txt b/Documentation/devicetree/overlay-notes.txt
index d418a6c..6995fc1 100644
--- a/Documentation/devicetree/overlay-notes.txt
+++ b/Documentation/devicetree/overlay-notes.txt
@@ -100,6 +100,10 @@ Finally, if you need to remove all overlays in one-go, just call
 of_overlay_destroy_all() which will remove every single one in the correct
+If your board has multiple slots/places where a single overlay can work
+and each slot is defined by a node, you can use the
+of_overlay_create_target_index() method to select the target.
 Overlay DTS Format
@@ -110,9 +114,11 @@ The DTS of an overlay should have the following format:
 	fragment@0 {	/* first child node */
-		target=<phandle>;	/* phandle target of the overlay */
+		/* phandle target of the overlay */
+		target=<phandle> [, <phandle>, ...];
-		target-path="/path";	/* target path of the overlay */
+		/* target path of the overlay */
+		target-path="/path" [ , "/path", ...];
 		__overlay__ {
 			property-a;	/* add property-a to the target */
@@ -131,3 +137,7 @@ Using the non-phandle based target method allows one to use a base DT which does
 not contain a __symbols__ node, i.e. it was not compiled with the -@ option.
 The __symbols__ node is only required for the target=<phandle> method, since it
 contains the information required to map from a phandle to a tree location.
+Using a target index requires the use of a selector target on the call to
+of_overlay_create_target_index(). I.e. passing an index of 0 will select the
+target in the foo node, an index of 1 the bar node, etc.

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