dt/bindings: Add binding for the Raspberry Pi firmware driver

This driver will provide support for calls into the firmware that will
be used by other drivers like cpufreq and vc4.

Signed-off-by: Eric Anholt <eric@anholt.net>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.txt b/Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.txt
new file mode 100644 (file)
index 0000000..6824b31
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.txt
@@ -0,0 +1,14 @@
+Raspberry Pi VideoCore firmware driver
+
+Required properties:
+
+- compatible:          Should be "raspberrypi,bcm2835-firmware"
+- mboxes:              Phandle to the firmware device's Mailbox.
+                         (See: ../mailbox/mailbox.txt for more information)
+
+Example:
+
+firmware {
+       compatible = "raspberrypi,bcm2835-firmware";
+       mboxes = <&mailbox>;
+};