Re: State of arbitration and i2c_gpio?

[Laxman Dewangan <ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>]

Hi Matthias,
I remember Viresh was working on this support sometimes ago where he 
added gpio based arbitration recovery on i2c-core.

http://lwn.net/Articles/485046/

I am also looking to use the gpio based arb recovery mechanism for the 
i2c-tegra.c.

As this recovery will be generic, better to have this in common place so 
that many driver can use this. Also the provision should be there to 
configure pin as gpio and non-gpio mode.

Thanks,
Laxman


On Monday 16 July 2012 08:45 PM, Matthias Urlichs wrote:
> Hello people,
>
> I'd like to ask whether anybody is working on adding arbitration support to
> i2c_algo_bit.c. The code still has the old "FIXME do arbitration here" comments,
> added five years ago when the I²C was imported into Linux 2.3.34pre1. :-/
>
> If not, and I'm going to have to do that myself … my main question is, even
> before I get to that -- how do I even detect that the bus is idle? Turn
> interrupts off and busy-loop-check that both SCL and SDA stay high for at least
> one and a half clock periods?
>
> Ugh.
>

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