From 86c22f8c9a3b71d42d38bfcd80372de72f573713 Mon Sep 17 00:00:00 2001 From: Ashwin Chaugule Date: Wed, 12 Nov 2014 19:59:38 -0500 Subject: Mailbox: Add support for Platform Communication Channel ACPI 5.0+ spec defines a generic mode of communication between the OS and a platform such as the BMC. This medium (PCC) is typically used by CPPC (ACPI CPU Performance management), RAS (ACPI reliability protocol) and MPST (ACPI Memory power states). This patch adds PCC support as a Mailbox Controller. As of ACPI v5.1 there is no provision for clients to lookup mailbox controllers in a way that Linux expects. e.g. in DT the clients can list the mailboxes they can associate with in the DT binding and then provide a unique index to lookup a channel within a mailbox. Since the ACPI spec doesn't have anything similar, we introduce a mailbox controller specific API so that when the client calls it, we know to lookup in the context of a specific controller. This also helps in keeping a consistent interface across DT and ACPI for such drivers. This patch implements basic PCC support using the ACPI v5.1 structures. IRQ mode support will be provided as follow up patches. Signed-off-by: Ashwin Chaugule Reviewed-by: Mark Brown Reviewed-by: Arnd Bergmann Signed-off-by: Jassi Brar --- drivers/mailbox/Kconfig | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'drivers/mailbox/Kconfig') diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig index 9fd9c6717e0c..c04fed9eb15d 100644 --- a/drivers/mailbox/Kconfig +++ b/drivers/mailbox/Kconfig @@ -33,4 +33,16 @@ config OMAP_MBOX_KFIFO_SIZE Specify the default size of mailbox's kfifo buffers (bytes). This can also be changed at runtime (via the mbox_kfifo_size module parameter). + +config PCC + bool "Platform Communication Channel Driver" + depends on ACPI + help + ACPI 5.0+ spec defines a generic mode of communication + between the OS and a platform such as the BMC. This medium + (PCC) is typically used by CPPC (ACPI CPU Performance management), + RAS (ACPI reliability protocol) and MPST (ACPI Memory power + states). Select this driver if your platform implements the + PCC clients mentioned above. + endif -- cgit v1.2.1