[PATCH v4 1/9] regulator: core: Add "enable and wait" functions

[Chen-Yu Tsai]

On Tue, Aug 11, 2026 at 8:43 PM Mark Brown <broonie at kernel.org> wrote:
>
> On Tue, Aug 11, 2026 at 08:20:01PM +0800, Chen-Yu Tsai wrote:
> > In device power sequencing and initialization use cases, it is common
> > for the driver to enable the regulator and then wait for a certain
> > period of time to pass before continuing.
>
> Please don't bury core changes for subsystems in the middle of random
> other serieses, this is the first time I've seen this.  :(

Sorry, that is entirely my fault. I was using an old v1 recipient list
on the previous two versions and that list didn't include you.

> > One case in particular is not optimized yet: a regulator left on either
> > by hardware reset default or by the bootloader, but does not have the
> > "regulator-boot-on" property set. As the enable timestamp only gets
> > updated when enabled by a consumer or by the core, the first enablement
> > always needs to wait.
>
> Just take a timestamp during registration if the regulator is enabled,
> we check if it's enabled anyway so we may as well take that as the last
> time the enable happened.

Yeah, I just haven't figured out where exactly in regulator_register() to
put it. I think it should be after the supplies are resolved, so maybe
I could do this in the "final setup" part in regulator_resolve_supply()?


Thanks
ChenYu