From: Laurent Pinchart <laurent.pinchart-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>
To: Russell King - ARM Linux <linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>
Cc: Grant Likely
<grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
Tomi Valkeinen <tomi.valkeinen-l0cyMroinI0@public.gmane.org>,
Philipp Zabel <p.zabel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>,
Sascha Hauer <s.hauer-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>,
Rob Herring <robherring2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Mauro Carvalho Chehab
<m.chehab-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>,
Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Sylwester Nawrocki
<s.nawrocki-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>,
Kyungmin Park
<kyungmin.park-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"linux-media-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-media-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Philipp Zabel
<philipp.zabel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: [RFC PATCH] [media]: of: move graph helpers from drivers/media/v4l2-core to drivers/of
Date: Thu, 20 Mar 2014 19:50:35 +0100 [thread overview]
Message-ID: <13435143.OQHHLITVrH@avalon> (raw)
In-Reply-To: <20140320181820.GY7528-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
Hi Russell,
On Thursday 20 March 2014 18:18:20 Russell King - ARM Linux wrote:
> On Thu, Mar 20, 2014 at 07:16:29PM +0100, Laurent Pinchart wrote:
> > On Thursday 20 March 2014 17:54:31 Grant Likely wrote:
> > > On Wed, 12 Mar 2014 10:25:56 +0000, Russell King - ARM Linux wrote:
[snip]
> > > > I believe trying to do this according to the flow of data is just
> > > > wrong. You should always describe things from the primary device for
> > > > the CPU towards the peripheral devices and never the opposite
> > > > direction.
> > >
> > > Agreed.
> >
> > Absolutely not agreed. The whole concept of CPU towards peripherals only
> > makes sense for very simple devices and breaks as soon as the hardware
> > gets more complex. There's no such thing as CPU towards peripherals when
> > peripherals communicate directly.
> >
> > Please consider use cases more complex than just a display controller and
> > an encoder, and you'll realize how messy not being able to parse the
> > whole graph at once will become. Let's try to improve things, not to make
> > sure to prevent support for future devices.
>
> That's odd, I did.
>
> Please draw some (ascii) diagrams of the situations you're saying this
> won't work for, because at the moment all I'm seeing is some vague
> hand-waving rather than anything factual that I can relate to. Help
> us to actually _see_ the problem you have with this approach so we can
> understand it.
Working on it. Given my drawing skills this will take a bit of time.
--
Regards,
Laurent Pinchart
--
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next prev parent reply other threads:[~2014-03-20 18:50 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-11 11:45 [RFC PATCH] [media]: of: move graph helpers from drivers/media/v4l2-core to drivers/of Philipp Zabel
[not found] ` < 20140310145815.17595C405FA@trevor.secretlab.ca>
[not found] ` < 20140320153804.35d5b835@samsung.com>
[not found] ` < 4339286.FzhQ2m6hoA@avalon>
[not found] ` < CAL_Jsq+U9zU1i+STLHMBjY5BeEP6djYnJVE5X1ix-D2q_zWztQ@mail.gmail.com>
[not found] ` < 20140217181451.7EB7FC4044D@trevor.secretlab.ca>
2014-02-11 13:56 ` Rob Herring
2014-02-11 14:52 ` Russell King - ARM Linux
2014-02-11 15:23 ` Laurent Pinchart
2014-02-11 16:36 ` Philipp Zabel
[not found] ` <1392136617.6943.33.camel-/rZezPiN1rtR6QfukMTsflXZhhPuCNm+@public.gmane.org>
2014-02-11 17:22 ` Sylwester Nawrocki
2014-02-11 17:41 ` Mauro Carvalho Chehab
2014-02-11 21:00 ` Guennadi Liakhovetski
2014-02-11 21:46 ` Philipp Zabel
2014-02-11 17:24 ` Laurent Pinchart
2014-02-11 16:30 ` Rob Herring
2014-02-11 15:27 ` Philipp Zabel
2014-02-17 18:14 ` Grant Likely
2014-02-18 7:06 ` Sascha Hauer
2014-02-18 16:26 ` Grant Likely
[not found] ` < 1393263389.3091.82.camel@pizza.hi.pengutronix.de>
[not found] ` <20140226110114. CF2C7C40A89@trevor.secretlab.ca>
[not found] ` <20140218162627.32BA4C40517-WNowdnHR2B42iJbIjFUEsiwD8/FfD2ys@public.gmane.org>
2014-02-24 17:36 ` Philipp Zabel
2014-02-26 11:01 ` Grant Likely
2014-02-26 14:48 ` Philipp Zabel
[not found] ` <1393426129.3248.64.camel-+qGW7pzALmz7o/J7KWpOmN53zsg1cpMQ@public.gmane.org>
2014-02-27 8:36 ` Tomi Valkeinen
2014-03-07 17:06 ` Grant Likely
2014-03-08 10:57 ` Tomi Valkeinen
2014-03-07 17:05 ` Grant Likely
2014-03-08 10:33 ` Tomi Valkeinen
2014-03-08 11:41 ` Grant Likely
2014-03-08 23:25 ` Sylwester Nawrocki
2014-03-10 10:18 ` Tomi Valkeinen
[not found] ` <531D916C.2010903-l0cyMroinI0@public.gmane.org>
2014-03-10 13:52 ` Laurent Pinchart
2014-03-10 14:10 ` Tomi Valkeinen
2014-03-10 14:58 ` Grant Likely
2014-03-10 15:15 ` Laurent Pinchart
2014-03-10 15:40 ` Philipp Zabel
2014-03-11 11:43 ` Laurent Pinchart
2014-03-11 12:59 ` Tomi Valkeinen
[not found] ` <1883687.VdfitvQEN3@samsung.com>
[not found] ` <avalon@samsung.com>
[not found] ` <531F08A8.300-l0cyMroinI0@public.gmane.org>
2014-03-11 13:16 ` Laurent Pinchart
2014-03-11 13:27 ` Tomi Valkeinen
2014-03-11 13:44 ` Philipp Zabel
2014-03-20 17:23 ` Grant Likely
2014-03-21 10:44 ` Andrzej Hajda
2014-03-21 11:47 ` Grant Likely
2014-03-21 12:16 ` Tomi Valkeinen
[not found] ` <532C2D94.4020705-l0cyMroinI0@public.gmane.org>
2014-03-21 14:33 ` Grant Likely
2014-03-20 17:09 ` Grant Likely
2014-03-11 13:04 ` Andrzej Hajda
[not found] ` <531F09E2.3070407-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
2014-03-20 17:33 ` Grant Likely
2014-03-20 17:01 ` Grant Likely
2014-03-21 12:10 ` Tomi Valkeinen
2014-03-11 15:07 ` Philipp Zabel
[not found] ` <1394550420.3772.29.camel-+qGW7pzALmz7o/J7KWpOmN53zsg1cpMQ@public.gmane.org>
2014-03-11 15:21 ` Laurent Pinchart
2014-03-11 18:52 ` Philipp Zabel
2014-03-20 17:53 ` Grant Likely
2014-03-20 17:36 ` Grant Likely
2014-03-12 10:25 ` Russell King - ARM Linux
2014-03-12 10:47 ` Tomi Valkeinen
[not found] ` <53203B2D.6080201-l0cyMroinI0@public.gmane.org>
2014-03-12 11:21 ` Laurent Pinchart
2014-03-20 17:54 ` Grant Likely
[not found] ` <20140320175432.0559CC4067A-WNowdnHR2B42iJbIjFUEsiwD8/FfD2ys@public.gmane.org>
2014-03-20 18:16 ` Laurent Pinchart
2014-03-20 18:18 ` Russell King - ARM Linux
[not found] ` <20140320181820.GY7528-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2014-03-20 18:50 ` Laurent Pinchart [this message]
2014-03-20 19:27 ` Laurent Pinchart
2014-03-20 18:38 ` Mauro Carvalho Chehab
2014-03-20 18:43 ` Russell King - ARM Linux
2014-03-20 18:49 ` Laurent Pinchart
2014-03-21 8:20 ` Tomi Valkeinen
[not found] ` <20140320153804.35d5b835@ samsung.com>
[not found] ` <20140320153804.35d5b835-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
2014-03-20 18:48 ` Grant Likely
[not found] ` <20140320184816.7AB02C4067A-WNowdnHR2B42iJbIjFUEsiwD8/FfD2ys@public.gmane.org>
2014-03-20 18:52 ` Laurent Pinchart
2014-03-20 23:12 ` Grant Likely
[not found] ` <20140320231250.8F0E0C412EA-WNowdnHR2B42iJbIjFUEsiwD8/FfD2ys@public.gmane.org>
2014-03-20 23:26 ` Laurent Pinchart
2014-03-21 8:15 ` Grant Likely
2014-03-21 12:44 ` Laurent Pinchart
2014-03-21 13:26 ` Grant Likely
2014-03-10 14:41 ` Grant Likely
2014-03-08 11:54 ` Russell King - ARM Linux
[not found] ` <20140217181451.7EB7FC4044D-WNowdnHR2B42iJbIjFUEsiwD8/FfD2ys@public.gmane.org>
2014-02-18 10:43 ` Sylwester Nawrocki
2014-02-18 13:41 ` Philipp Zabel
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