linux-kernel - Re: [PATCH v1 1/4] i2c: mux: Add i2c-arbitrator 'mux' driver

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Date:	Wed, 13 Feb 2013 10:49:11 -0800
From:	Olof Johansson <olof@...om.net>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Wolfram Sang <w.sang@...gutronix.de>,
	Simon Glass <sjg@...omium.org>,
	Naveen Krishna Chatradhi <ch.naveen@...sung.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Yuvaraj Kumar <yuvaraj.cd@...il.com>,
	Ben Dooks <ben.dooks@...ethink.co.uk>,
	u.kleine-koenig@...gutronix.de,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Girish Shivananjappa <girish.shivananjappa@...aro.org>,
	bhushan.r@...sung.com, sreekumar.c@...sung.com,
	Prashanth G <prashanth.g@...sung.com>,
	Daniel Kurtz <djkurtz@...omium.org>,
	Grant Grundler <grundler@...omium.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	"Ben Dooks (embedded platforms)" <ben-linux@...ff.org>,
	Jean Delvare <khali@...ux-fr.org>,
	Peter Korsgaard <peter.korsgaard@...co.com>,
	Stephen Warren <swarren@...dia.com>,
	Guenter Roeck <guenter.roeck@...csson.com>,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org
Subject: Re: [PATCH v1 1/4] i2c: mux: Add i2c-arbitrator 'mux' driver

On Wed, Feb 13, 2013 at 10:45 AM, Olof Johansson <olof@...om.net> wrote:

>> +             i2c-parent = <&{/i2c@...A0000}>;
>
> Why use this custom i2c-parent property? The arbitrator should just be
> under the i2c controller in the device tree, and thus parent would be
> derived from the topology there.

Ah. Reading up on the discussions for the other mux bindings, there's
the issue of the arbitrator not being addressable/accessible via i2c.

Sigh, awkward and annoying, since it breaks the topography for the
hardware apart due to the arbitrator. But I guess there's no good
alternative. :(


-Olof
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