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

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Message-ID: <20120913105309.GF14237@pengutronix.de>
Date:	Thu, 13 Sep 2012 12:53:09 +0200
From:	Wolfram Sang <w.sang@...gutronix.de>
To:	Aaro Koskinen <aaro.koskinen@....fi>
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 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...

Jean, maybe you want to have a glimpse on this as well?

Regards,

   Wolfram

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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