On Mon, May 9, 2016 at 1:05 PM, Pantelis Antoniou
<pantelis.antoniou@xxxxxxxxxxxx> 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 <pantelis.antoniou@xxxxxxxxxxxx>
> ---
> 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
>
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