linux-kernel - Re: [PATCH 3/6] doc: dt: Document the indirect overlay method.

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Date:	Mon, 9 May 2016 16:59:14 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Pantelis Antoniou <pantelis.antoniou@...sulko.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" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Pantelis Antoniou <panto@...oniou-consulting.com>
Subject: Re: [PATCH 3/6] doc: dt: Document the indirect overlay method.

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