tree fb66d8fc644552c39ec79b8ca7b280571b92fbaf
parent d90385be7ef79c75770b4630f4d16bc13c03c2dc
author Simon Glass <sjg@chromium.org> 1491431016 -0600
committer Tom Rini <trini@konsulko.com> 1494375572 -0400

arm: rpi: Add a file to handle messages

The bcm283x chips provide a way for the ARM core to communicate with the
graphics processor, which is in charge of many things. This is handled by
way of a message prototcol.

At present the code for sending message (and receiving a reply) is spread
around U-Boot, primarily in the board file. This means that sending a
message from a driver requires duplicating the code.

Create a new message implementation with a function to support powering on
a subsystem as a starting point.

Signed-off-by: Simon Glass <sjg@chromium.org>