[RFC] i2c: Providing hooks for i2c multimaster bus arbitration.

[wolfram@the-dreams.de (Wolfram Sang)]

Hi,

> > At the moment perhaps the strongest argument for why this particular
> > arbitration scheme is needed is that's what the EC (embedded
> > controller) on the ARM Chromebook uses.  There have been several
> > arguments in-house about whether this was the most ideal way to
> > structure things, but that's what we shipped with.  Thus, if we want
> > to be able to talk to i2c devices on this bus (contains the keyboard,
> > battery, and a bunch of power switches) we need something in the
> > system that implements this arbitration scheme.
> >
> 
> There was some discussion about using the built-in I2C multi-master
> support but no one had had a good experience getting it to work
> reliably in a real system so we ended up deciding not to rely on this.

So, were there no experiences at all or bad experiences when trying? I
am interested in hearing what I2C multi master restrictions might exist
in practice.

Thanks,

   Wolfram