From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:40942)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <pbonzini@redhat.com>) id 1WFPFK-0004Ex-82
	for qemu-devel@nongnu.org; Mon, 17 Feb 2014 09:32:40 -0500
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <pbonzini@redhat.com>) id 1WFPFE-0000T6-9F
	for qemu-devel@nongnu.org; Mon, 17 Feb 2014 09:32:34 -0500
Received: from mx1.redhat.com ([209.132.183.28]:26234)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <pbonzini@redhat.com>) id 1WFPE2-0000Fb-EU
	for qemu-devel@nongnu.org; Mon, 17 Feb 2014 09:31:14 -0500
Message-ID: <53021CF6.5010808@redhat.com>
Date: Mon, 17 Feb 2014 15:30:14 +0100
From: Paolo Bonzini <pbonzini@redhat.com>
MIME-Version: 1.0
References: <CAA17Vo98dsydzB=c=rPnL0FJ=5FzKhUYYTzRwZjww6kCbS828Q@mail.gmail.com>	<52FE3D0E.8070904@redhat.com>	<52FE44DB.8030408@suse.de>	<52FE4820.8050009@redhat.com>	<CAA17Vo98LAygDVEFozQtrsi5o5zysNCG6Joe6PjJyHTd0Hmk0A@mail.gmail.com>	<5301D40F.2010506@redhat.com>	<CAA17Vo9E9D-jPa3gwhsui3i=APz1FM-41jbK+zpOm2tWf7swdw@mail.gmail.com>	<CAA17Vo-YtkkxCuG0W1DnfbscyViJKTiwzgvCQStaNjXyqa+bdA@mail.gmail.com>	<5301DC83.6030307@redhat.com>	<CAA17Vo_cBCbKkqDu2zQ0DW2FoAyVqxVXGtNGArJ1tnk6N9AUqA@mail.gmail.com>	<5301E6AA.7000809@redhat.com>	<CAA17Vo-QadUk_jVu4KTDnJxHj+NLOYuH9BPe2D1Zc4N9s45=1w@mail.gmail.com>	<CAA17Vo9Js3f1B=dGcx-DHjBxVM6ciaYdZGoyQh0YfnYikN4XcA@mail.gmail.com>	<53020C67.5040603@redhat.com>
	<CAA17Vo9iMsJ2gMHKFxc_dkZzmJ_q8EfFCDLyfMaAgi5VTTjiNw@mail.gmail.com>
In-Reply-To: <CAA17Vo9iMsJ2gMHKFxc_dkZzmJ_q8EfFCDLyfMaAgi5VTTjiNw@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Subject: Re: [Qemu-devel] Fwd: Trying to write a new device / virtio-i2c ?
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Alex David <alex.daerf@gmail.com>
Cc: qemu-devel <qemu-devel@nongnu.org>

Il 17/02/2014 14:32, Alex David ha scritto:
>
> But that leaves me with another problem as I now understand how I2C
> works on linux... I, in fact, need at least 3 busses (for my at least 3
> devices) - so i2c-0, i2c-1, i2c-2

So you cannot configure the three devices on the same bus, with three 
different addresses?

> ... There are applications I can't
> change on the guest and opening / writing / reading on i2c-0, i2c-1 etc...
>
> Can I just declare these busses using i2c-dev ?

If you need more than one bus, you need a new device exposing the I2C 
bus, besides the new sensor devices.  USB-I2C could be one such device.

Paolo