Re: [PATCH] devicetree: Add video bus switch

Pavel Machek
2017-03-02T09:02:44Z

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On Mon 2017-02-13 12:20:35, Sakari Ailus wrote:
> Hi Pavel,
>
> On Mon, Feb 13, 2017 at 10:54:20AM +0100, Pavel Machek wrote:
> > Hi!
> >
> > > > Take a look at the wikipedia. If you do "one at a time" at 100Hz, you
> > > > can claim it is time-domain multiplex. But we are plain switching the
> > > > cameras. It takes second (or so) to setup the pipeline.
> > > >
> > > > This is not multiplex.
> > >
> > > The functionality is still the same, isn't it? Does it change what it is if
> > > the frequency might be 100 Hz or 0,01 Hz?
> >
> > Well. In your living your you can have a switch, which is switch at
> > much less than 0.01Hz. You can also have a dimmer, which is a PWM,
> > which is switch at 100Hz or so. So yes, I'd say switch and mux are
> > different things.
>
> Light switches are mostly on/off switches. It'd be interesting to have a
> light switch that you could use to light either of the light bulbs in a room
> but not to switch both of them on at the same time. Or off... :-)
>
> I wonder if everyone would be happy with a statement saying that it's a
> on / on switch which is used to implement a multiplexer?

I believe the difference is the timescale. If it switches "slow" it is
a switch. If it switches fast, it is a dimmer, mux, or something....

Anyway, someone else was faster, so they get to name their creation...

Pavel

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

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