[PATCH v2 2/2] mailbox: apple: Add driver for Apple mailboxes

[Alyssa Rosenzweig]

> +#define APPLE_ASC_MBOX_CONTROL_FULL  BIT(16)
> +#define APPLE_ASC_MBOX_CONTROL_EMPTY BIT(17)
...
> +#define APPLE_M3_MBOX_CONTROL_FULL  BIT(16)
> +#define APPLE_M3_MBOX_CONTROL_EMPTY BIT(17)

It might make sense to combine these to just

> +#define APPLE_MBOX_CONTROL_FULL  BIT(16)
> +#define APPLE_MBOX_CONTROL_EMPTY BIT(17)

..unless we have a reason to think the status bits otherwise differ.

Regardless of that minor nit, this is

Reviewed-by: Alyssa Rosenzweig <alyssa at rosenzweig.io>