linux-kernel - Re: [PATCH v4 3/3] Documentation: of: Document graph bindings

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Date:	Mon, 10 Mar 2014 08:53:44 +0200
From:	Tomi Valkeinen <tomi.valkeinen@...com>
To:	Grant Likely <grant.likely@...aro.org>,
	Philipp Zabel <p.zabel@...gutronix.de>
CC:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	Rob Herring <robh+dt@...nel.org>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	<linux-kernel@...r.kernel.org>, <linux-media@...r.kernel.org>,
	<devicetree@...r.kernel.org>,
	Guennadi Liakhovetski <g.liakhovetski@....de>
Subject: Re: [PATCH v4 3/3] Documentation: of: Document graph bindings

On 08/03/14 14:25, Grant Likely wrote:

> Sure. If endpoints are logical, then only create the ones actually
> hooked up. No problem there. But nor do I see any issue with having
> empty connections if the board author things it makes sense to have them
> in the dtsi.

I don't think they are usually logical, although they probably might be
in some cases.

As I see it, a "port" is a group of pins in a hardware component, and
two endpoints define a connection between two ports, which on the HW
level are the wires between the ports.

So a port with two endpoints is a group of pins, with wires that go from
the same pins to two different components.

 Tomi



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