linux-kernel - Re: [PATCH] devicetree: Add video bus switch

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Message-ID: <20170302085456.GA27818@amd>
Date:   Thu, 2 Mar 2017 09:54:56 +0100
From:   Pavel Machek <pavel@....cz>
To:     Sakari Ailus <sakari.ailus@....fi>
Cc:     Rob Herring <robh@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
        Sebastian Reichel <sre@...nel.org>,
        Pali Rohár <pali.rohar@...il.com>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        Kumar Gala <galak@...eaurora.org>,
        Mauro Carvalho Chehab <mchehab@....samsung.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Steve Longerbeam <slongerbeam@...il.com>,
        p.zabel@...gutronix.de
Subject: Re: [PATCH] devicetree: Add video bus switch

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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