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Date:	Sat, 8 Mar 2014 12:57:06 +0200
From:	Tomi Valkeinen <>
To:	Grant Likely <>,
	Philipp Zabel <>
CC:	Sascha Hauer <>,
	Rob Herring <>,
	Russell King - ARM Linux <>,
	Mauro Carvalho Chehab <>,
	Rob Herring <>,
	Sylwester Nawrocki <>,
	Laurent Pinchart <>,
	Kyungmin Park <>,
	"" <>,
	"" <>,
	"" <>,
	Philipp Zabel <>
Subject: Re: [RFC PATCH] [media]: of: move graph helpers from drivers/media/v4l2-core
 to drivers/of

On 07/03/14 19:06, Grant Likely wrote:
> On Thu, 27 Feb 2014 10:36:36 +0200, Tomi Valkeinen <> wrote:
>> On 26/02/14 16:48, Philipp Zabel wrote:
>>>> I would like the document to acknowledge the difference from the
>>>> phandle+args pattern used elsewhere and a description of when it would
>>>> be appropriate to use this instead of a simpler binding.
>>> Alright. The main point of this binding is that the devices may have
>>> multiple distinct ports that each can be connected to other devices.
>> The other main point with this binding are multiple endpoints per port.
>> So you can have, say, a display controller, with single port, which has
>> two endpoints going to two separate LCD panels.
>> In physical level that would usually mean that the same pins from the
>> display controller are connected to two panels. Most likely this would
>> mean that only one panel can be used at a time, possibly with different
>> settings (say, 16 RGB pins for one panel, 24 RGB pins for the other).
> What device is in control in that scenario?

The endpoints in a single port are exclusive, only one can be active at
a time. So the control for the active path would be no different than in
single panel case (for which people have different opinions).


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