On Tue, Jun 14, 2016 at 11:13:20AM +0200, Boris Brezillon wrote:

The continuous PWM voltage regulator is caching the voltage value in
the ->volt_uV field. While most of the time this value should reflect the
real voltage, sometime it can be sightly different if the PWM device
rounded the set_duty_cycle request.
Moreover, this value is not valid until someone has modified the regulator
output.

Acked-by: Mark Brown <broonie@kernel.org>