[PATCH 6/8] power: domain: apple: Add reset support

[Mark Kettenis]

> From: Simon Glass <sjg at chromium.org>
> Date: Fri, 21 Jan 2022 18:40:23 -0700
> 
> Hi Mark,
> 
> On Fri, 14 Jan 2022 at 04:05, Mark Kettenis <kettenis at openbsd.org> wrote:
> >
> > The power management controller found on Apple SoCs als provides
> > a way to reset all devices within a power domain. This is needed
> > to cleanly shutdown the NVMe controller before we hand over
> > control to the OS.
> >
> > Signed-off-by: Mark Kettenis <kettenis at openbsd.org>
> > ---
> >  arch/arm/Kconfig                  |  1 +
> >  drivers/power/domain/apple-pmgr.c | 73 ++++++++++++++++++++++++++++++-
> >  2 files changed, 73 insertions(+), 1 deletion(-)
> 
> This should use devicetree instead of device_bind() and be a reset
> driver in drivers/reset

Not sure what you mean with "this should use devicetree".  The reset
and power domain functionality is integrated in the same hardware
register and there is a single node that decsribes the device.

The Linux driver implements the power domain and reset functionality
in a single driver as well.  I suppose I could move the reset code
into a file of its own in drivers/reset, but I don't think it would
make the code easier to understand.  And I'd still need to bind the
reset driver explicitly in apple_pmgr_probe() as it isn't possible to
automatically bind two drivers to a single device tree node as far as
I can tell.