On Mon, Oct 26, 2020 at 07:38:14PM +0100, Fabien Parent wrote:
> On Mon, Oct 26, 2020 at 6:24 PM Mark Brown <broonie@kernel.org> wrote:

> > >         .name = "mt6392-regulator",
> > >         .of_compatible = "mediatek,mt6392-regulator"

> > This is still unneeded, it's just a reflection of Linux implementation
> > details and should be removed.   The MFD can just register the child
> > without supplying a compatible and things will continue to work just as
> > well.

> I'm not exactly sure how it is supposed to work. mfd_add_devices seems
> to register devices based on of_compatible or acpi_match from the
> mfd_cell. This platform does not have ACPI so I don't understand how

It should also support unconditionally registering devices, if it no
longer does so that's a regression in the framework which should be
fixed.  Looking at mfd_add_devices() I can't see an issue though, both
ACPI and DT information is optional - the entire DT section in
mfd_add_device() will be skipped if no of_compatible is specified in the
cell.  Are you *sure* that the regulator driver isn't running?