From: Thierry Reding <thierry.reding@gmail.com>
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: devicetree@vger.kernel.org, linux-samsung-soc@vger.kernel.org,
seanpaul@google.com, daniel.vetter@ffwll.ch, joshi@samsung.com,
dri-devel@lists.freedesktop.org,
Andrzej Hajda <a.hajda@samsung.com>,
Tomi Valkeinen <tomi.valkeinen@ti.com>,
ajaynumb@gmail.com, prashanth.g@samsung.com,
Ajay Kumar <ajaykumar.rs@samsung.com>
Subject: Re: [PATCH V7 11/12] Documentation: bridge: Add documentation for ps8622 DT properties
Date: Tue, 23 Sep 2014 16:49:38 +0200 [thread overview]
Message-ID: <20140923144937.GG5982@ulmo> (raw)
In-Reply-To: <2238934.uLuAbtBXFj@avalon>
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On Tue, Sep 23, 2014 at 02:52:24PM +0300, Laurent Pinchart wrote:
> On Tuesday 23 September 2014 13:47:40 Andrzej Hajda wrote:
> > On 09/23/2014 01:23 PM, Laurent Pinchart wrote:
[...]
> > > This becomes an issue even on Linux when considering video-related devices
> > > that can be part of either a capture pipeline or a display pipeline. If
> > > the link always goes in the data flow direction, then it will be easy to
> > > locate the downstream device (bridge or panel) from the display controller
> > > driver, but it would be much more difficult to locate the same device from
> > > a camera driver as all of a sudden the device would become an upstream
> > > device.
> >
> > Why?
> >
> > If you have graph:
> > sensor --> camera
> >
> > Then camera register itself in some framework as a destination device
> > and sensor looks in this framework for the device identified by remote
> > endpoint.
> > Then sensor tells camera it is connected to it and voila.
>
> Except that both kernelspace and userspace deal with cameras the other way
> around, the master device is the camera receiver, not the camera sensor. DRM
> is architected the same way, with the component that performs DMA operations
> being the master device.
I don't see what's wrong with having the camera reference the sensor by
phandle instead. That's much more natural in my opinion.
Thierry
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next prev parent reply other threads:[~2014-09-23 14:49 UTC|newest]
Thread overview: 93+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-27 14:39 [PATCH V7 11/12] Documentation: bridge: Add documentation for ps8622 DT properties Ajay Kumar
2014-08-27 14:39 ` [PATCH V7 10/12] Documentation: devicetree: Add vendor prefix for parade Ajay Kumar
2014-08-27 14:39 ` [PATCH V7 09/12] Documentation: drm: bridge: move to video/bridge Ajay Kumar
2014-09-17 11:52 ` [PATCH V7 11/12] Documentation: bridge: Add documentation for ps8622 DT properties Tomi Valkeinen
2014-09-17 14:29 ` Ajay kumar
2014-09-17 16:22 ` Tomi Valkeinen
2014-09-18 5:50 ` Ajay kumar
2014-09-19 12:54 ` Tomi Valkeinen
2014-09-19 13:59 ` Ajay kumar
2014-09-19 14:28 ` Tomi Valkeinen
2014-09-20 11:22 ` Ajay kumar
2014-09-20 15:27 ` Javier Martinez Canillas
2014-09-22 6:00 ` Ajay kumar
2014-09-22 15:05 ` Tomi Valkeinen
2014-10-07 10:30 ` Tomi Valkeinen
2014-10-07 10:36 ` Ajay kumar
2014-10-07 14:49 ` Laurent Pinchart
2014-10-08 7:09 ` Thierry Reding
2014-10-10 13:03 ` Ajay kumar
2014-10-16 8:23 ` Ajay kumar
2014-10-16 9:04 ` Laurent Pinchart
2014-10-28 9:12 ` Javier Martinez Canillas
2014-10-28 11:12 ` Ajay kumar
2014-09-22 8:26 ` Thierry Reding
2014-09-22 14:42 ` Tomi Valkeinen
2014-09-23 5:53 ` Thierry Reding
2014-09-23 8:41 ` Tomi Valkeinen
2014-09-23 9:28 ` Thierry Reding
2014-09-23 11:15 ` Tomi Valkeinen
2014-09-23 14:29 ` Thierry Reding
2014-09-23 15:25 ` Tomi Valkeinen
2014-09-22 8:10 ` Thierry Reding
2014-09-22 8:31 ` Ajay kumar
2014-09-22 10:41 ` Thierry Reding
2014-09-22 11:23 ` Ajay kumar
2014-09-22 11:35 ` Thierry Reding
2014-09-22 12:12 ` Ajay kumar
2014-09-23 0:00 ` Laurent Pinchart
2014-09-23 5:55 ` Thierry Reding
2014-09-23 6:11 ` Ajay kumar
2014-09-23 6:28 ` Thierry Reding
2014-09-23 11:47 ` DT property to selectively disable device features (was [PATCH V7 11/12] Documentation: bridge: Add documentation for ps8622 DT properties) Laurent Pinchart
2014-09-22 8:06 ` [PATCH V7 11/12] Documentation: bridge: Add documentation for ps8622 DT properties Thierry Reding
2014-09-22 14:23 ` Tomi Valkeinen
2014-09-23 6:04 ` Thierry Reding
2014-09-23 7:24 ` Andrzej Hajda
2014-09-23 8:35 ` Thierry Reding
2014-09-23 9:40 ` Tomi Valkeinen
2014-09-23 10:01 ` Thierry Reding
2014-09-23 12:09 ` Tomi Valkeinen
2014-09-23 14:38 ` Thierry Reding
2014-09-23 15:33 ` Tomi Valkeinen
2014-09-23 9:43 ` Andrzej Hajda
2014-09-23 10:10 ` Thierry Reding
2014-09-23 10:34 ` Andrzej Hajda
2014-09-23 14:41 ` Thierry Reding
2014-09-24 7:11 ` Andrzej Hajda
2014-09-24 8:27 ` Tomi Valkeinen
2014-09-23 11:33 ` Laurent Pinchart
2014-09-23 8:54 ` Tomi Valkeinen
2014-09-23 9:39 ` Thierry Reding
2014-09-23 11:31 ` Tomi Valkeinen
2014-09-23 14:45 ` Thierry Reding
2014-09-24 8:42 ` Tomi Valkeinen
2014-10-06 14:40 ` Laurent Pinchart
2014-10-07 7:06 ` Tomi Valkeinen
2014-10-07 7:23 ` Laurent Pinchart
2014-10-07 8:25 ` Tomi Valkeinen
2014-10-07 16:14 ` Laurent Pinchart
2014-09-22 7:54 ` Thierry Reding
2014-09-22 14:04 ` Tomi Valkeinen
2014-09-23 6:21 ` Thierry Reding
2014-09-23 9:30 ` Tomi Valkeinen
2014-09-23 9:53 ` Thierry Reding
2014-09-23 11:12 ` Laurent Pinchart
2014-09-23 14:50 ` Thierry Reding
2014-09-23 12:00 ` Tomi Valkeinen
2014-09-23 14:58 ` Thierry Reding
2014-09-24 9:08 ` Tomi Valkeinen
2014-09-25 6:23 ` Thierry Reding
2014-10-06 11:34 ` Tomi Valkeinen
2014-10-06 13:55 ` Laurent Pinchart
2014-09-23 10:02 ` Andrzej Hajda
2014-09-23 10:02 ` Andrzej Hajda
2014-09-23 11:10 ` Laurent Pinchart
2014-09-23 11:18 ` Andrzej Hajda
2014-09-23 11:23 ` Laurent Pinchart
2014-09-23 11:47 ` Andrzej Hajda
2014-09-23 11:52 ` Laurent Pinchart
2014-09-23 12:40 ` Andrzej Hajda
2014-09-23 12:40 ` Andrzej Hajda
2014-09-23 14:49 ` Thierry Reding [this message]
2014-10-06 14:38 ` Laurent Pinchart
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