From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pavel Machek <pavel-+ZI9xUNit7I@public.gmane.org>
Subject: Re: [PATCH] devicetree: Add video bus switch
Date: Fri, 10 Feb 2017 20:54:35 +0100
Message-ID: <20170210195435.GA1615@amd>
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Cc: Sakari Ailus <sakari.ailus-X3B1VOXEql0@public.gmane.org>, "devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" <devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Ivaylo Dimitrov <ivo.g.dimitrov.75-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Sebastian Reichel <sre-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Pali =?iso-8859-1?Q?Roh=E1r?= <pali.rohar-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, "linux-media-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" <linux-media-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Kumar Gala <galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>, Mauro Carvalho Chehab <mchehab-JPH+aEBZ4P+UEJcrhfAQsw@public.gmane.org>, "linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
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> >>> > diff --git a/Documentation/devicetree/bindings/media/video-bus-swit=
ch.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
> >>> > +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D
> >>>
> >>> 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
--=20
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo=
g.html

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