Hi Mark, On 3 July 2017 at 17:36, Mark Brown <broo...@kernel.org> wrote: > On Mon, Jul 03, 2017 at 05:33:03PM +0200, Waldemar Rymarkiewicz wrote: > >> I've asked also on TI forum if this is typical to the regulator not to >> determine the startup voltage but still waiting for feedback. Anyway, >> if this is the case I guess a driver is a good place to update >> register before we register to the regulator framework. > > It's really unusual to have a device that has the voltage changable by > register write at runtime where the current state can't be read back.
or you did not realise that this is initialised by bootloader for example. After investigating this issue a bit more I've found that this is rather typical for power regulators not to update a register with startup voltage set by a feedback resistor divider as it would cost extra circuit. So, I assume that most likely a bootloader normally initializes power regulator in case it's needed eg. if it's supplying CPU which is DVS-enabled. Anyway, it's more clear now to me how this should be done. /Waldek
