On Thu, Aug 05, 2021 at 08:58:58AM -0400, Peter Geis wrote:
> On Thu, Aug 5, 2021 at 8:47 AM Mark Brown <broonie@kernel.org> wrote:

> > One thing to watch out for with this approach is if there's things that
> > really need a specific voltage to be set then you'll have to stop those
> > things happening if you've got a voltage regulator that can't deliver a
> > voltage in the required range.  I don't know if this affects MMC or not,
> > if it's just a case of being less efficient it's not such an issue.

> Yeah, but if this is a fixed regulator and it's a problem, then the
> hardware is screwed anyways.

Well, the fact that the voltage is being changed at runtime indicates
that we're changing something from whatever was in the fixed setup - it
can sometimes be that we don't have access to some higher performance or
lower power features for example.  That's not ideal but works perfectly
safely.