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

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Date:	Tue, 11 Feb 2014 18:24:19 +0100
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Philipp Zabel <p.zabel@...gutronix.de>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Rob Herring <robherring2@...il.com>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Philipp Zabel <philipp.zabel@...il.com>
Subject: Re: [RFC PATCH] [media]: of: move graph helpers from drivers/media/v4l2-core to drivers/of

Hi Philipp,

On Tuesday 11 February 2014 17:36:57 Philipp Zabel wrote:
> Am Dienstag, den 11.02.2014, 16:23 +0100 schrieb Laurent Pinchart:
> > On Tuesday 11 February 2014 14:52:48 Russell King - ARM Linux wrote:
> > > On Tue, Feb 11, 2014 at 07:56:33AM -0600, Rob Herring wrote:
> > > > On Tue, Feb 11, 2014 at 5:45 AM, Philipp Zabel wrote:
> > > > > This allows to reuse the same parser code from outside the V4L2
> > > > > framework, most importantly from display drivers. There have been
> > > > > patches that duplicate the code (and I am going to send one of my
> > > > > own),
> > > > > such as
> > > > > http://lists.freedesktop.org/archives/dri-devel/2013-August/043308.h
> > > > > tml
> > > > > and others that parse the same binding in a different way:
> > > > > https://www.mail-archive.com/linux-omap@vger.kernel.org/msg100761.ht
> > > > > ml
> > > > > 
> > > > > I think that all common video interface parsing helpers should be
> > > > > moved to a single place, outside of the specific subsystems, so that
> > > > > it can be reused by all drivers.
> > > > 
> > > > Perhaps that should be done rather than moving to drivers/of now and
> > > > then again to somewhere else.
> > > 
> > > Do you have a better suggestion where it should move to?
> > > 
> > > drivers/gpu/drm - no, because v4l2 wants to use it
> > > drivers/media/video - no, because DRM drivers want to use it
> > > drivers/video - no, because v4l2 and drm drivers want to use it
> > 
> > Just pointing out a missing location (which might be rejected due to
> > similar concerns), there's also drivers/media, which isn't V4L-specific.
> 
> Since drivers/Makefile has media/ in obj-y, moving the graph helpers to
> drivers/media should technically work.
> 
> > > Maybe drivers/of-graph/ ?  Or maybe it's just as good a place to move it
> > > into drivers/of ?
> 
> include/media/of_graph.h,
> drivers/media/of_graph.c?

I'm personally fine with that.

-- 
Regards,

Laurent Pinchart

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