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Date:	Mon, 10 Mar 2014 14:41:02 +0000
From:	Grant Likely <>
To:	Tomi Valkeinen <>,
	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 Mon, 10 Mar 2014 12:18:20 +0200, Tomi Valkeinen <> wrote:
> On 08/03/14 13:41, Grant Likely wrote:
> >> Ok. If we go for single directional link, the question is then: which
> >> way? And is the direction different for display and camera, which are
> >> kind of reflections of each other?
> > 
> > In general I would recommend choosing whichever device you would
> > sensibly think of as a master. In the camera case I would choose the
> > camera controller node instead of the camera itself, and in the display
> > case I would choose the display controller instead of the panel. The
> > binding author needs to choose what she things makes the most sense, but
> > drivers can still use if it it turns out to be 'backwards'
> I would perhaps choose the same approach, but at the same time I think
> it's all but clear. The display controller doesn't control the panel any
> more than a DMA controller controls, say, the display controller.

In a sense it doesn't actually matter. You sensibly want to choose the
most likely direction that drivers would go looking for a device it
depends on, but it can be matched up at runtime regardless of the
direction chosen by the binding.

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