linux-kernel - Re: [PATCH v6 1/3] i2c: mux: Add i2c-arb-gpio-challenge 'mux' driver

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Message-ID: <20130416163458.GA4918@quad.lixom.net>
Date:	Tue, 16 Apr 2013 09:34:58 -0700
From:	Olof Johansson <olof@...om.net>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Wolfram Sang <wsa@...-dreams.de>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Simon Glass <sjg@...omium.org>,
	Naveen Krishna Chatradhi <ch.naveen@...sung.com>,
	grant.likely@...retlab.ca, yuvaraj.cd@...il.com,
	ben.dooks@...ethink.co.uk, u.kleine-koenig@...gutronix.de,
	broonie@...nsource.wolfsonmicro.com,
	girish.shivananjappa@...aro.org, bhushan.r@...sung.com,
	sreekumar.c@...sung.com, prashanth.g@...sung.com,
	djkurtz@...omium.org, swarren@...dotorg.org, linux@...ck-us.net,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	"Ben Dooks (embedded platforms)" <ben-linux@...ff.org>,
	Stephen Warren <swarren@...dia.com>,
	Jean Delvare <khali@...ux-fr.org>,
	Peter Korsgaard <peter.korsgaard@...co.com>,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org
Subject: Re: [PATCH v6 1/3] i2c: mux: Add i2c-arb-gpio-challenge 'mux' driver

Overdue, should have added a few iterations ago: :)

On Tue, Apr 16, 2013 at 09:29:00AM -0700, Doug Anderson wrote:
> The i2c-arb-gpio-challenge driver implements an I2C arbitration scheme
> where masters need to claim the bus with a GPIO before they can start
> a transcation.  This should generally only be used when standard I2C
> multimaster isn't appropriate for some reason (errata/bugs).
> 
> This driver is based on code that Simon Glass added to the i2c-s3c2410
> driver in the Chrome OS kernel 3.4 tree.  The current incarnation as a
> mux driver is as suggested by Grant Likely.  See
> <https://patchwork.kernel.org/patch/1877311/> for some history.
> 
> Signed-off-by: Doug Anderson <dianders@...omium.org>
> Signed-off-by: Simon Glass <sjg@...omium.org>
> Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@...sung.com>
> Reviewed-by: Stephen Warren <swarren@...dia.com>

Acked-by: Olof Johansson <olof@...om.net>

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