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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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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