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

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Message-ID: <20170204010406.piycm675bm7r6vv6@earth>
Date:   Sat, 4 Feb 2017 02:04:06 +0100
From:   Sebastian Reichel <sre@...nel.org>
To:     Pavel Machek <pavel@....cz>
Cc:     Pali Rohár <pali.rohar@...il.com>,
        Sakari Ailus <sakari.ailus@....fi>, robh+dt@...nel.org,
        devicetree@...r.kernel.org, ivo.g.dimitrov.75@...il.com,
        linux-media@...r.kernel.org, galak@...eaurora.org,
        mchehab@....samsung.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] devicetree: Add video bus switch

Hi,

On Fri, Feb 03, 2017 at 10:07:28PM +0100, Pavel Machek wrote:
> On Fri 2017-02-03 14:32:19, Pali Rohár wrote:
> > On Friday 03 February 2017 13:35:08 Pavel Machek wrote:
> > > N900 contains front and back camera, with a switch between the
> > > two. This adds support for the switch component, and it is now
> > > possible to select between front and back cameras during runtime.
> > 
> > IIRC for controlling cameras on N900 there are two GPIOs. Should
> > not you have both in switch driver?
>
> I guess you recall wrongly :-). Switch seems to work. The issue was
> with switch GPIO also serving as reset GPIO for one sensor, or
> something like that, if _I_ recall correctly ;-).

I have a schematic in my master thesis, which shows how the camera
sensors are connected to the SoC. The PDF is available here:

https://www.uni-oldenburg.de/fileadmin/user_upload/informatik/ag/svs/download/thesis/Reichel_Sebastian.pdf

The schematic is on page 37 (or 45 if your PDF reader does not
use different numbers for the preamble stuff).

--Sebastian

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