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

Pavel Machek
2017-02-24T20:09:02Z

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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