linux-kernel - Re: [PATCH RFC] media: rc: OF: Add Generic bindings for remote-control

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Message-ID: <524C5B81.5040602@wwwdotorg.org>
Date:	Wed, 02 Oct 2013 11:44:33 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Mauro Carvalho Chehab <m.chehab@...sung.com>
CC:	srinivas.kandagatla@...com, Mark Rutland <mark.rutland@....com>,
	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	Pawel Moll <Pawel.Moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Landley <rob@...dley.net>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC] media: rc: OF: Add Generic bindings for remote-control

On 10/02/2013 11:33 AM, Mauro Carvalho Chehab wrote:
...
> Well, from userspace PoV, it should have just one devnode for each
> TX/RX.

I'm fine with that.

> So, if the device has N TX and/or RX simultaneous connections, it should
> be exposing N device nodes, and the DT should for it should have N entries,
> one for each.

DT is based on the actual HW construction, not how a particular OS wants
to expose that HW through its APIs. If there is a single HW block, there
should be a single DT node, even if that HW block supports multiple
channels.

In some circumstances, it might make sense for the single top-level node
that represents the HW-block to have child nodes that represent the
channels, depending on what exactly the HW is doing and whether this
level of detail is useful in DT. I would qualify this as rare though.
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