linux-kernel - Re: [PATCH] devicetree: Add video bus switch

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Date:   Mon, 6 Feb 2017 00:40:12 +0100
From:   Sebastian Reichel <sre@...nel.org>
To:     Pavel Machek <pavel@....cz>
Cc:     Sakari Ailus <sakari.ailus@....fi>, mchehab@...pensource.com,
        laurent.pinchart@...asonboard.com, robh+dt@...nel.org,
        devicetree@...r.kernel.org, ivo.g.dimitrov.75@...il.com,
        pali.rohar@...il.com, linux-media@...r.kernel.org,
        galak@...eaurora.org, mchehab@....samsung.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] devicetree: Add video bus switch

Hi,

On Sun, Feb 05, 2017 at 10:12:20PM +0100, Pavel Machek wrote:
> > > 9) Highly reconfigurable hardware - Julien Beraud
> > > 
> > > - 44 sub-devices connected with an interconnect.
> > > - As long as formats match, any sub-device could be connected to any
> > > - other sub-device through a link.
> > > - The result is 44 * 44 links at worst.
> > > - A switch sub-device proposed as the solution to model the
> > > - interconnect. The sub-devices are connected to the switch
> > > - sub-devices through the hardware links that connect to the
> > > - interconnect.
> > > - The switch would be controlled through new IOCTLs S_ROUTING and
> > > - G_ROUTING.
> > > - Patches available:
> > >  http://git.linuxtv.org/cgit.cgi/pinchartl/media.git/log/?h=xilinx-wip
> > > 
> > > but the patches are from 2005. So I guess I'll need some guidance here...
> > 
> > Yeah, that's where it began (2015?), but right now I can only suggest to
> > wait until there's more. My estimate is within next couple of weeks /
> > months. But it won't be years.
> 
> Ok, week or two would be ok, couple of months is not. And all I need
> is single hook in common structure.
> 
> So if g_endpoint_config hook looks sane to _you_, I suggest we simply
> proceed. Now, maybe Mauro Carvalho Chehab <mchehab@...pensource.com>
> or Laurent or Julien will want a different solution, but
> then... they'll have to suggest something doable now, not in couple of
> months.
> 
> Does that sound like a plan?
> 
> Mauro added to cc list, so we can get some input.

side note: It's an kernel-internal API only used by the media
subsystem. Code can be easily updated to use an improved API
at any time.

-- Sebastian

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