On Fri, Sep 14, 2012 at 12:08:06PM +0200, Wolfram Sang wrote:

On Mon, Sep 03, 2012 at 11:23:22PM +0300, Aaro Koskinen wrote:

quoted

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-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Acked-by: Felipe Balbi <redacted>
Acked-by: Tony Lindgren <redacted>
Signed-off-by: Aaro Koskinen <redacted>

OK, I found the short paragrahp about CBUS in the I2C spec, so I2C might
be an appropriate place. Still, before deciding if it should rather be
in the core directory, I still have a few questions.

Also, does anybody know of a generic bit-banging implementation in the
kernel which could be used here?

there is i2c-gpio, but it wouldn't help much for cbus, unless we change
it quite a lot. The generic i2c_algo_bit_data would have to be changed
to learn about a 3 wire bus. I guess the impact is much bigger than just
accepting this small, self-contained driver.

-- 
balbi