linux-kernel - Re: [PATCH v7 00/34] i.MX Media Driver

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Message-ID: <20170531201107.GB16962@amd>
Date:   Wed, 31 May 2017 22:11:07 +0200
From:   Pavel Machek <pavel@....cz>
To:     Steve Longerbeam <slongerbeam@...il.com>
Cc:     Sakari Ailus <sakari.ailus@....fi>,
        Hans Verkuil <hverkuil@...all.nl>, robh+dt@...nel.org,
        mark.rutland@....com, shawnguo@...nel.org, kernel@...gutronix.de,
        fabio.estevam@....com, linux@...linux.org.uk, mchehab@...nel.org,
        nick@...anahar.org, markus.heiser@...marIT.de,
        p.zabel@...gutronix.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, sakari.ailus@...ux.intel.com,
        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>
Subject: Re: [PATCH v7 00/34] i.MX Media Driver

Hi!

> >If there's a need for this (there should not be, as the controls are exposed
> >to the user space through the sub-device nodes as the other drivers do), the
> >framework APIs need to be extended.
> 
> Right, this gets back to the media framework usability arguments. At least
> myself, Philipp, and Russell feel that automatic inheritance of a configured
> pipeline's controls to a video device adds to the usability.

For the record, usability can be pretty much fixed in v4l-utils... I
have patches that try ioctls on a list of fd's. Now we need a way to
find out which /dev/video* files belong to single camera. I believe
kernel already has required APIs, we just need to apply v4l-utils
patch to use them...

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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