On Mon, May 9, 2016 at 1:05 PM, Pantelis Antoniou <[email protected]> wrote: > Add a description of the indirect overlay method to the overlay > documention file.
Why? Please write some decent commit messages. > Signed-off-by: Pantelis Antoniou <[email protected]> > --- > Documentation/devicetree/overlay-notes.txt | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > > diff --git a/Documentation/devicetree/overlay-notes.txt > b/Documentation/devicetree/overlay-notes.txt > index d418a6c..dd595e6 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 > order. > > +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_indirect() > +method to select the target. > + > Overlay DTS Format > ------------------ > > @@ -113,6 +117,11 @@ The DTS of an overlay should have the following format: > target=<phandle>; /* phandle target of the overlay */ > or > target-path="/path"; /* target path of the overlay */ Why not just let these take multiple values and the user just selects index? > + or > + target-indirect { /* indirect target selector */ > + foo { target|target-path ... }; > + bar { .... }; > + }; > > __overlay__ { > property-a; /* add property-a to the target */ > @@ -131,3 +140,7 @@ 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. > + > +The indirect target requires the use of a selector target on the call to > +of_overlay_create_indirect(). I.e. passing the "foo" id will select the > target > +in the foo node, "bar" in bar node, etc. > -- > 1.7.12 >
