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 08:00:02 +0200
From:	Tomi Valkeinen <tomi.valkeinen@...com>
To:	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>, <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 08/03/14 17:54, Laurent Pinchart wrote:

>> Sylwester suggested as an alternative, if I understood correctly, to
>> drop the endpoint node and instead keep the port:
>>
>>     device-a {
>>         implicit_output_ep: port {
>>             remote-endpoint = <&explicit_input_ep>;
>>         };
>>     };
>>
>>     device-b {
>>         port {
>>             explicit_input_ep: endpoint {
>>                 remote-endpoint = <&implicit_output_ep>;
>>             };
>>         };
>>     };
>>
>> This would have the advantage to reduce verbosity for devices with multiple
>> ports that are only connected via one endport each, and you'd always have
>> the connected ports in the device tree as 'port' nodes.
> 
> I like that idea. I would prefer making the 'port' nodes mandatory and the 
> 'ports' and 'endpoint' nodes optional. Leaving the 'port' node out slightly 
> decreases readability in my opinion, but making the 'endpoint' node optional 
> increases it. That's just my point of view though.

I, on the other hand, don't like it =). With that format, the
remote-endpoint doesn't point to an EP, but a port. And you'll have
endpoint's properties in a port node, among the port's properties.

 Tomi



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