soc: apple: Add support for the AOP co-processor

This is the base device for a multi-function co-processor present
on certain Apple SoCs. On M-series Macs it is in charge of internal
microphones, and various environmental sensors.

Signed-off-by: Sasha Finkelstein <fnkl.kernel@gmail.com>
Signed-off-by: Janne Grunau <j@jannau.net>

Author: WhatAmISupposedToPutHere

drivers/soc/apple/Kconfig

@@ -44,6 +44,18 @@ config RUST_APPLE_RTKIT
 	depends on RUST
 	select APPLE_RTKIT
 
+config APPLE_AOP
+	tristate "Apple \"Always-on\" Processor"
+	depends on ARCH_APPLE || COMPILE_TEST
+	depends on PM
+	depends on RUST
+	select RUST_APPLE_RTKIT
+	help
+	  A co-processor persent on certain Apple SoCs controlling accelerometers,
+	  gyros, ambient light sensors and microphones. Is not actually always on.
+
+	  Say 'y' here if you have an Apple laptop.
+
 endmenu
 
 endif

drivers/soc/apple/Makefile

@@ -8,3 +8,5 @@ apple-rtkit-y = rtkit.o rtkit-crashlog.o
 
 obj-$(CONFIG_APPLE_SART) += apple-sart.o
 apple-sart-y = sart.o
+
+obj-$(CONFIG_APPLE_AOP) += aop.o