Re: [PATCH 1/4] regulator: core: If consumers don't call regulator_set_load() assume max

From: Doug Anderson
Date: Thu Aug 16 2018 - 16:07:54 EST


On Wed, Aug 15, 2018 at 4:13 AM, Mark Brown <broonie@xxxxxxxxxx> wrote:
> On Tue, Aug 14, 2018 at 04:56:42PM -0700, Doug Anderson wrote:
>> IMO about the best we could hope to do would be to map "mode" from
>> children to parent. AKA: perhaps you could assume that if a child is
>> in a higher power mode that perhaps a parent should be too?
> That's not going to work well - different regulators have wildly
> different abilities to deliver current which is the whole reason why
> modes are so fuzzy and hard to use in the first place. A high power
> load for a low noise regulator designed to feed analogue circuits might
> not even make it out of the lowest power LDO mode of a DCDC designed to
> supply the main application processors in the system or (more
> relevantly) provide the main step down for a bunch of LDOs.

OK, fair enough. I'll drop this patch and rebase the later patches in
the series without it since I think they're still useful.

I'll work on either adding more regulator_set_load() calls to clients
or perhaps disabling the "regulator-allow-set-load" for a bunch of
rails. David: presumably if we have a rail that we never need to be
on-and-in-low-power-mode can just be left in high power mode all the
time? There should be no advantage of being in low power mode for a
regulator that is off, right?