> Thanks, this would be great! I tested this on a sam9x60, with the HW 
> feature for the 9 pulses disabled, with a picky audio codec as I2C device.
> Please let me know of the result.

I can't make use of the feature on the platform I had in mind, sadly. It
doesn't really support switching from/to GPIO pinctrl states. If that
ever changes, I will add bus recovery for that controller, but I think
this is low priority.

On the good side, there are patches which make i2c-mv64xxx another user
of your new mechanism, so everything is well, I think.