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

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Message-ID: <20170319132501.GA25673@amd>
Date:   Sun, 19 Mar 2017 14:25:01 +0100
From:   Pavel Machek <pavel@....cz>
To:     Russell King - ARM Linux <linux@...linux.org.uk>
Cc:     Hans Verkuil <hverkuil@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...pensource.com>,
        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, 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>,
        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 11:42:03, Russell King - ARM Linux wrote:
> On Tue, Mar 14, 2017 at 08:55:36AM +0100, Hans Verkuil wrote:
> > We're all very driver-development-driven, and userspace gets very little
> > attention in general. So before just throwing in the towel we should take
> > a good look at the reasons why there has been little or no development: is
> > it because of fundamental design defects, or because nobody paid attention
> > to it?
> > 
> > I strongly suspect it is the latter.
> > 
> > In addition, I suspect end-users of these complex devices don't really care
> > about a plugin: they want full control and won't typically use generic
> > applications. If they would need support for that, we'd have seen much more
> > interest. The main reason for having a plugin is to simplify testing and
> > if this is going to be used on cheap hobbyist devkits.
> 
> I think you're looking at it with a programmers hat on, not a users hat.
> 
> Are you really telling me that requiring users to 'su' to root, and then
> use media-ctl to manually configure the capture device is what most
> users "want" ?

If you want to help users, right way is to improve userland support. 

> Hasn't the way technology has moved towards graphical interfaces,
> particularly smart phones, taught us that the vast majority of users
> want is intuitive, easy to use interfaces, and not the command line
> with reams of documentation?

How is it relevant to _kernel_ interfaces?
									Pavel

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

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