On Tue, Jun 08, 2021 at 04:08:55PM +0200, Ulf Hansson wrote:

Honestly, I am not sure about what the regulator-fixed-domain intends
to model, but I assume it's something that fits well to be modelled as
a plain regulator, to start with.

Perhaps Mark can chime in and spread some light over this?

IIRC it's for situations where there's a device that's normally built as
a separate chip that got built into a bigger SoC and wants to rear end
something onto a power domain, I guess especially if the power domain
doesn't cover the whole of a Linux device.