On Wed, May 20, 2015 at 01:02:49AM +0000, Zha, Qipeng wrote:

Please don't top post.

> Not sure what's your mean using regmap api without bus suport for this case
> Confirm many device driver will use this api.

Please take a look at the code, particularly the reg_read() and
reg_write() interface which I've mentioned in each of my previous
replies and their users.  If you have queries about these please ask.

> The detail is
> Beside pmic core driver itself, there are many pmic function device dirvers, 
> such as gpio, theremal, charger, bcu ..., will use this regmap api to access registers.

This sounds like this is a single device, not a generic bus.