linux-kernel - [PATCH v2 6/6] doc: dt: Document the target root overlay method

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Date:	Mon, 16 May 2016 23:18:12 +0300
From:	Pantelis Antoniou <pantelis.antoniou@...sulko.com>
To:	Rob Herring <robherring2@...il.com>
Cc:	Frank Rowand <frowand.list@...il.com>,
	Matt Porter <mporter@...sulko.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Koen Kooi <koen@...inion.thruhere.net>,
	Guenter Roeck <linux@...ck-us.net>,
	Marek Vasut <marex@...x.de>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
	Pantelis Antoniou <panto@...oniou-consulting.com>
Subject: [PATCH v2 6/6] doc: dt: Document the target root overlay method

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

Signed-off-by: Pantelis Antoniou <pantelis.antoniou@...sulko.com>
---
 Documentation/devicetree/overlay-notes.txt | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/overlay-notes.txt b/Documentation/devicetree/overlay-notes.txt
index 6995fc1..3e8df30 100644
--- a/Documentation/devicetree/overlay-notes.txt
+++ b/Documentation/devicetree/overlay-notes.txt
@@ -104,6 +104,10 @@ 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.
 
+For overlays on probeable busses, use the of_overlay_create_target_root() method
+in which you supply a device node as a target root, and which all target
+references in the overlay are performed relative to that node.
+
 Overlay DTS Format
 ------------------
 
@@ -141,3 +145,7 @@ 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.
+
+Note that when using the target root create method all target references must
+lie under the target root node. I.e. the overlay is not allowed to 'break' out
+of the root.
-- 
1.7.12