linux-kernel - Re: [PATCH v4 14/36] [media] v4l2-mc: add a function to inherit controls from a pipeline

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Date:   Fri, 17 Mar 2017 14:51:10 +0100
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Mauro Carvalho Chehab <mchehab@...pensource.com>
Cc:     Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Hans Verkuil <hverkuil@...all.nl>,
        Sakari Ailus <sakari.ailus@....fi>,
        Steve Longerbeam <slongerbeam@...il.com>, robh+dt@...nel.org,
        mark.rutland@....com, shawnguo@...nel.org, kernel@...gutronix.de,
        fabio.estevam@....com, mchehab@...nel.org, nick@...anahar.org,
        markus.heiser@...marIT.de,
        laurent.pinchart+renesas@...asonboard.com, bparrot@...com,
        geert@...ux-m68k.org, arnd@...db.de, sudipm.mukherjee@...il.com,
        minghsiu.tsai@...iatek.com, tiffany.lin@...iatek.com,
        jean-christophe.trotin@...com, horms+renesas@...ge.net.au,
        niklas.soderlund+renesas@...natech.se, robert.jarzmik@...e.fr,
        songjun.wu@...rochip.com, andrew-ct.chen@...iatek.com,
        gregkh@...uxfoundation.org, shuah@...nel.org, pavel@....cz,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        devel@...verdev.osuosl.org,
        Steve Longerbeam <steve_longerbeam@...tor.com>,
        Jacek Anaszewski <j.anaszewski@...sung.com>
Subject: Re: [PATCH v4 14/36] [media] v4l2-mc: add a function to inherit
 controls from a pipeline

On Fri, 2017-03-17 at 10:24 -0300, Mauro Carvalho Chehab wrote:
[...]
> The big question, waiting for an answer on the last 8 years is
> who would do that? Such person would need to have several different
> hardware from different vendors, in order to ensure that it has
> a generic solution.
> 
> It is a way more feasible that the Kernel developers that already 
> have a certain hardware on their hands to add support inside the
> driver to forward the controls through the pipeline and to setup
> a "default" pipeline that would cover the common use cases at
> driver's probe.

Actually, would setting pipeline via libv4l2 plugin and letting drivers
provide a sane enabled default pipeline configuration be mutually
exclusive? Not sure about the control forwarding, but at least a simple
link setup and format forwarding would also be possible in the kernel
without hindering userspace from doing it themselves later.

regards
Philipp