tree 7a540c904e57691a459d144af393d361e340fc22
parent 11636258981a083957c19f3979796fde5e7e8080
author Stephen Warren <swarren@nvidia.com> 1463176229 -0600
committer Simon Glass <sjg@chromium.org> 1464317311 -0600

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>