Multiple regulators for one device [was drm/panfrost: add devfreq regulator support]

[Mark Brown]

On Thu, Apr 16, 2020 at 02:42:13PM +0100, Steven Price wrote:
> On 14/04/2020 20:16, Clément Péron wrote:

> > That's can be reworked and Panfrost can only probe regulator if there
> > is no opp-table.

> This is what I was thinking about looking at. But it may make sense instead
> to extend the regulator API to allow multiple regualtor_get() calls for a
> single device. I haven't had time to dig into how difficult this would be.

To repeat what I said before we don't actively stop this, it's just not
something that seems particularly tasteful and the warning does find
actual errors.  I definitely don't think it's a good idea to extend the
API for this.

> Ideally calling regulator_get a second time for the same device would simply
> return the same struct regulator object (with a reference count increment).

One of the goals with the distinct struct regulator is to make sure that
we track all the user's activity together - if we mix multiple users in
there it becomes harder to tell if something is going wrong.
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