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

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Date:	Tue, 10 May 2016 09:36:46 -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>
Subject: Re: [PATCH 3/6] doc: dt: Document the indirect overlay method.

On Tue, May 10, 2016 at 8:59 AM, Pantelis Antoniou
<pantelis.antoniou@...sulko.com> wrote:
> Hi Rob,
>
>> On May 10, 2016, at 00:59 , Rob Herring <robherring2@...il.com> wrote:
>>
>> 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?
>>
>
> Implementation details. Usually there’s a descriptive label used for each
> different target point. It could be a slot# or it could be a label…
>
> A string selector maps better IMO.

Then add "target-names" perhaps.

What I really don't like is 3 different ways to specify the target and
having to maintain them (I'm not sure why we allowed 2 to start
with.). Come up with a single way that works for 1 or more targets. If
that is different than the current way, then let's deprecate the old
way.

Rob