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

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Message-ID: <20170210195435.GA1615@amd>
Date:   Fri, 10 Feb 2017 20:54:35 +0100
From:   Pavel Machek <pavel@....cz>
To:     Rob Herring <robh@...nel.org>
Cc:     Sakari Ailus <sakari.ailus@....fi>,
        "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>
Subject: Re: [PATCH] devicetree: Add video bus switch


> >>> > diff --git a/Documentation/devicetree/bindings/media/video-bus-switch.txt b/Documentation/devicetree/bindings/media/video-bus-switch.txt
> >>> > new file mode 100644
> >>> > index 0000000..1b9f8e0
> >>> > --- /dev/null
> >>> > +++ b/Documentation/devicetree/bindings/media/video-bus-switch.txt
> >>> > @@ -0,0 +1,63 @@
> >>> > +Video Bus Switch Binding
> >>> > +========================
> >>>
> >>> I'd call it a mux rather than switch.
> >>
> >> It is a switch, not a multiplexor (
> >> https://en.wikipedia.org/wiki/Multiplexing ). Only one camera can
> >> operate at a time.
> >
> > It's no different than an i2c mux. It's one at a time.

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.

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

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