On 19.06.25 13:49, Lee Jones wrote:

On Tue, 10 Jun 2025, Sven Peter wrote:

quoted

The System Management Controller (SMC) on Apple Silicon machines is a
piece of hardware that exposes various functionalities such as
temperature sensors, voltage/power meters, shutdown/reboot handling,
GPIOs and more.

Communication happens via a shared mailbox using the RTKit protocol
which is also used for other co-processors. The SMC protocol then allows
reading and writing many different keys which implement the various
features. The MFD core device handles this protocol and exposes it
to the sub-devices.

Some of the sub-devices are potentially also useful on pre-M1 Apple
machines and support for SMCs on these machines can be added at a later
time.

Co-developed-by: Hector Martin <redacted>
Signed-off-by: Hector Martin <redacted>
Reviewed-by: Alyssa Rosenzweig <redacted>
Reviewed-by: Neal Gompa <neal@gompa.dev>
Signed-off-by: Sven Peter <sven@kernel.org>
---
  MAINTAINERS                |   2 +
  drivers/mfd/Kconfig        |  18 ++
  drivers/mfd/Makefile       |   1 +
  drivers/mfd/macsmc.c       | 498 +++++++++++++++++++++++++++++++++++++++++++++
  include/linux/mfd/macsmc.h | 279 +++++++++++++++++++++++++
  5 files changed, 798 insertions(+)

This is ready.  Let me know when you have all of the other driver/* Acks.

They've all been reviewed by the respective maintainers.

I assume you want to take this all through the mfd tree and we'll need 
acks from Sebastian for power/reset and either Linus or Bartosz for gpio 
then.

The one line change inside drivers/soc/apple would usually go through my 
tree and I'm fine with taking that through mfd instead.


Sven