Add a mailbox driver framework/uclass
A mailbox is a hardware mechanism for transferring small message and/or
notifications between the CPU on which U-Boot runs and some other device
such as an auxilliary CPU running firmware or a hardware module.
This patch defines a standard API that connects mailbox clients to mailbox
providers (drivers). Initially, DT is the only supported method for
connecting the two.
The DT binding specification (mailbox.txt) was taken from Linux kernel
v4.5's Documentation/devicetree/bindings/mailbox/mailbox.txt.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig
new file mode 100644
index 0000000..295e6db
--- /dev/null
+++ b/drivers/mailbox/Kconfig
@@ -0,0 +1,13 @@
+menu "Mailbox Controller Support"
+
+config DM_MAILBOX
+ bool "Enable mailbox controllers using Driver Model"
+ depends on DM && OF_CONTROL
+ help
+ Enable support for the mailbox driver class. Mailboxes provide the
+ ability to transfer small messages and/or notifications from one
+ CPU to another CPU, or sometimes to dedicated HW modules. They form
+ the basis of a variety of inter-process/inter-CPU communication
+ protocols.
+
+endmenu