[PATCH v7 05/10] mfd: Add Apple Silicon System Management Controller

[Sven Peter]

On 19.06.25 13:49, Lee Jones wrote:
> On Tue, 10 Jun 2025, Sven Peter wrote:
> 
>> 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 <marcan at marcan.st>
>> Signed-off-by: Hector Martin <marcan at marcan.st>
>> Reviewed-by: Alyssa Rosenzweig <alyssa at rosenzweig.io>
>> Reviewed-by: Neal Gompa <neal at gompa.dev>
>> Signed-off-by: Sven Peter <sven at 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