linux-kernel - Re: [PATCH 1/4] i2c: introduce i2c-cbus driver

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Message-ID: <20120913145104.GA8849@blackmetal.musicnaut.iki.fi>
Date:	Thu, 13 Sep 2012 17:51:05 +0300
From:	Aaro Koskinen <aaro.koskinen@....fi>
To:	Wolfram Sang <w.sang@...gutronix.de>
Cc:	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-i2c@...r.kernel.org, Jean Delvare <khali@...ux-fr.org>
Subject: Re: [PATCH 1/4] i2c: introduce i2c-cbus driver

On Thu, Sep 13, 2012 at 12:53:09PM +0200, Wolfram Sang wrote:
> On Mon, Sep 03, 2012 at 11:23:22PM +0300, Aaro Koskinen wrote:
> > Add i2c driver to enable access to devices behind CBUS on Nokia Internet
> > Tablets.
> > 
> > The patch also adds CBUS I2C configuration for N8x0 which is one of the
> > users of this driver.
> > 
> > Cc: linux-i2c@...r.kernel.org
> > Acked-by: Felipe Balbi <balbi@...com>
> > Acked-by: Tony Lindgren <tony@...mide.com>
> > Signed-off-by: Aaro Koskinen <aaro.koskinen@....fi>
> 
> My main question is: what is CBUS? It doesn't look like an I2C/SMBUS
> host controller, but some bit-banging protocol? As such, it shouldn't go
> to i2c/busses/. And the protocol doesn't look much like I2C, neither.
> There is no ACK/NACK/START/STOP, so I wonder if it should be in i2c
> after all...

It's some legacy 3-wire bus protocol. Not much info is available,
there's some references to CBUS in i2c spec, so I thought it wouldn't
be a completly wrong place for it...

A.
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