mailbox: apple: Add driver for Apple IOP mailbox
This mailbox driver provides a communication channel with the
Apple IOP controllers found on Apple SoCs. These IOP controllers
are used to implement various functions such as the System
Manegement Controller (SMC) and NVMe storage. It allows sending
and receiving a 96-bit message over a single channel.
The header file with the struct used for mailbox messages is taken
straight from Linux.
Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
Signed-off-by: Sven Peter <sven@svenpeter.dev>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested on: Macbook Air M1
Tested-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig
index dd4b0ac..73db2af 100644
--- a/drivers/mailbox/Kconfig
+++ b/drivers/mailbox/Kconfig
@@ -10,6 +10,17 @@
the basis of a variety of inter-process/inter-CPU communication
protocols.
+config APPLE_MBOX
+ bool "Enable Apple IOP controller support"
+ depends on DM_MAILBOX && ARCH_APPLE
+ default y
+ help
+ Enable support for the mailboxes that provide a comminucation
+ channel with Apple IOP controllers integrated on Apple SoCs.
+ These IOP controllers are used to implement various functions
+ such as the System Management Controller (SMC) and NVMe and this
+ driver is required to get that functionality up and running.
+
config SANDBOX_MBOX
bool "Enable the sandbox mailbox test driver"
depends on DM_MAILBOX && SANDBOX