linux-kernel - Re: [PATCH v4 15/36] platform: add video-multiplexer subdevice driver

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Date:   Fri, 24 Feb 2017 21:09:02 +0100
From:   Pavel Machek <pavel@....cz>
To:     Philipp Zabel <p.zabel@...gutronix.de>
Cc:     Steve Longerbeam <slongerbeam@...il.com>, robh+dt@...nel.org,
        mark.rutland@....com, shawnguo@...nel.org, kernel@...gutronix.de,
        fabio.estevam@....com, linux@...linux.org.uk, mchehab@...nel.org,
        hverkuil@...all.nl, 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,
        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,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Steve Longerbeam <steve_longerbeam@...tor.com>
Subject: Re: [PATCH v4 15/36] platform: add video-multiplexer subdevice driver

Hi!

> > Plus you might want to describe which port correspond to which gpio
> > state/bitfield values...
> > 
> > > +struct vidsw {
> > 
> > I knew it: it is secretely a switch! :-).
> 
> This driver started as a two-input gpio controlled bus switch.
> I changed the name when adding support for bitfield controlled
> multiplexers with more than two inputs.

We had discussion with Sakari / Rob whether gpio controlled thing is a
switch or a multiplexer :-).

> > > +	if (!pad) {
> > > +		/* Mirror the input side on the output side */
> > > +		cfg->type = vidsw->endpoint[vidsw->active].bus_type;
> > > +		if (cfg->type == V4L2_MBUS_PARALLEL ||
> > > +		    cfg->type == V4L2_MBUS_BT656)
> > > +			cfg->flags = vidsw->endpoint[vidsw->active].bus.parallel.flags;
> > > +	}
> > 
> > Will this need support for other V4L2_MBUS_ values?
> 
> To support CSI-2 multiplexers, yes.

Can you stick switch () { .... default: dev_err() } there, to help
future hackers?

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

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