On Sat, Sep 10, 2016 at 02:03:35PM +0300, Andy Shevchenko wrote:

> Please, correct me if I'm wrong in the following:
> 1) mapping is what kept in the regulator_map_list;
> 2) the only way to list something for this mapping is to use one of
> regulator drivers that will call regulator_register() at the end;
> 3) in case of fixed voltage regulator it prepares configuration and
> description (based on platform code for example) of the regulator and
> calls devm_regulator_register();
> 4) regulator_register() _will not_ add fixed regulator to the mapping if
> GPIO is deferred;
> 5) regulator_dev_lookup() didn't see the regulator before
> deferred_probe_initcall() happened.

> If the above is correct, how to add mapping to be seen in 5) ?

You may need to extend the interfaces offered by the core - one of the
great advantages of an open source kernel like Linux is that you can
modify the whole system if needed.