On Thu, Jun 06, 2013 at 11:40:50AM +0100, Nick Dyer wrote:

I am more worried about the address pointer handling and the I2C retries.

The retries can just be done further up the stack?  All regmap is doing
with I/O errors is punting them straight back up to the caller so the
caller can retry just as well using regmap as it can using the raw I/O
protocol.

Without seeing the address thing it's hard to comment.