On Thu, Jul 14, 2022 at 08:23:39AM -0600, Rob Herring wrote:
> On Thu, Jul 14, 2022 at 8:14 AM Mark Brown <broonie@kernel.org> wrote:

> > It's a description of a power supply output from their system (system as
> > a whole, not power provisioned within the system).

> Well, that's a better commit message than the original, but I still
> don't understand.

Consider for example a BMC (IIRC that's what their specific product is),
a bench supply or some automated test equipment.  Part of the function
for these systems is to provide power to other systems which would be
represented as a root or wall supply in the description of the system
that actually uses the supply if it were described using DT.