Regmap - has anyone sucessfully used it yet?

Hello,

Regmap was introduced in Kernel 3.1 (see http://lxr.free-electrons.com/source/drivers/base/regmap/ for more information).
It’s an API to access register maps of connected hardware via SPI or I2C.
I’m having a bit of trouble using the API, can anyone point me in the right direction?

Thanks