linux-kernel - Re: [PATCH v4 1/3] [media] of: move graph helpers from drivers/media/v4l2-core to drivers/of

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Date:	Mon, 10 Mar 2014 11:29:11 +0200
From:	Tomi Valkeinen <tomi.valkeinen@...com>
To:	Andrzej Hajda <a.hajda@...sung.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Philipp Zabel <philipp.zabel@...il.com>
CC:	Grant Likely <grant.likely@...aro.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	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>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
	"open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>,
	Guennadi Liakhovetski <g.liakhovetski@....de>
Subject: Re: [PATCH v4 1/3] [media] of: move graph helpers from drivers/media/v4l2-core
 to drivers/of

On 10/03/14 10:58, Andrzej Hajda wrote:

> I want to propose another solution to simplify bindings, in fact I have
> few ideas to consider:
> 
> 1. Use named ports instead of address-cells/regs. Ie instead of
> port@...ber schema, use port-function. This will allow to avoid ports
> node and #address-cells, #size-cells, reg properties.
> Additionally it should increase readability of the bindings.
> 
> device {
> 	port-dsi {
> 		endpoint { ... };
> 	};
> 	port-rgb {
> 		endpoint { ... };
> 	};
> };
> 
> It is little bit like with gpios vs reset-gpios properties.
> Another advantage I see we do not need do mappings of port numbers
> to functions between dts, drivers and documentation.

That makes it more difficult to iterate the ports. You need to go
through all the nodes and use partial name matching. I think for things
like gpios, the driver always gives the full name, so there's no need
for any kind of partial matching or searching.

It looks nice when just looking at the DT, though.

 Tomi



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