linux-kernel - Re: [PATCH v7 05/10] mfd: Add Apple Silicon System Management Controller

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Message-ID: <20250619114958.GJ587864@google.com>
Date: Thu, 19 Jun 2025 12:49:58 +0100
From: Lee Jones <lee@...nel.org>
To: Sven Peter <sven@...nel.org>
Cc: Janne Grunau <j@...nau.net>, Alyssa Rosenzweig <alyssa@...enzweig.io>,
	Neal Gompa <neal@...pa.dev>, Hector Martin <marcan@...can.st>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Sebastian Reichel <sre@...nel.org>, Marc Zyngier <maz@...nel.org>,
	"Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
	asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v7 05/10] mfd: Add Apple Silicon System Management
 Controller

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@...can.st>
> Signed-off-by: Hector Martin <marcan@...can.st>
> Reviewed-by: Alyssa Rosenzweig <alyssa@...enzweig.io>
> Reviewed-by: Neal Gompa <neal@...pa.dev>
> Signed-off-by: Sven Peter <sven@...nel.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.

-- 
Lee Jones [李琼斯]