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

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Message-ID: <Pine.LNX.4.64.1402112158230.521@axis700.grange>
Date:	Tue, 11 Feb 2014 22:00:04 +0100 (CET)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	Mauro Carvalho Chehab <m.chehab@...sung.com>
cc:	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Rob Herring <robherring2@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	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

On Wed, 12 Feb 2014, Mauro Carvalho Chehab wrote:

> Em Tue, 11 Feb 2014 18:22:34 +0100
> Sylwester Nawrocki <s.nawrocki@...sung.com> escreveu:
> 
> > (adding Guennadi to Cc)
> > 
> > On 11/02/14 17:36, Philipp Zabel wrote:
> > > Am Dienstag, den 11.02.2014, 16:23 +0100 schrieb Laurent Pinchart:
> > >> Hi Russell,
> > >>
> > >> 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.html
> > >>>>> and others that parse the same binding in a different way:
> > >>>>> https://www.mail-archive.com/linux-omap@vger.kernel.org/msg100761.html
> > >>>>>
> > >>>>> 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?
> > 
> > drivers/media sounds like a good alternative to me.
> 
> From my side, I'm ok with putting them at drivers/media. You may add my acked-by
> for such change:
> 
> Acked-by: Mauro Carvalho Chehab <m.chehab@...sung.com>

Cannot see any problems with this

Acked-by: Guennadi Liakhovetski <g.liakhovetski@....de>

Thanks
Guennadi

> > I would just remove also v4l2_of_{parse/get}* and update the users
> > to call of_graph_* directly, there should not be many of them.
> > 
> > --
> > Thanks,
> > Sylwester
> 
> -- 
> 
> Cheers,
> Mauro
> 

---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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