[PATCH 1/4] Documentation: dt: mailbox: Add Aspeed ast2400/2500 bindings

[Cyril Bur <cyrilbur@gmail.com>]

Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
---
 .../devicetree/bindings/mailbox/aspeed-mbox.txt    | 44 ++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mailbox/aspeed-mbox.txt

diff --git a/Documentation/devicetree/bindings/mailbox/aspeed-mbox.txt b/Documentation/devicetree/bindings/mailbox/aspeed-mbox.txt
new file mode 100644
index 000000000000..633cd534d91c
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/aspeed-mbox.txt
@@ -0,0 +1,44 @@
+ASpeed Mailbox Driver
+=====================
+
+The ASpeed mailbox allows for communication between different
+processors. The mailbox on the ASpeed ast2400 and ast2500 is a set of
+16 single byte data registers along with interrupt and configuration
+registers directly on the SoC. These are memory mapped on the aspeed
+and can be accessed via the SuperIO registers on the other processor.
+
+Device Node:
+============
+This represents the mailbox on the Soc.
+
+As the mailbox registers sit on the LPC bus, it makes most sense for
+the device to be within the LPC host node. See
+Documentation/devicetree/bindings/mfd/aspeed-lpc.txt for more
+information. This does not have to be the case, provided the reg
+property can give the full address of the mbox registers.
+
+Required Properties:
+--------------------
+- compatible:	Should be one of the following,
+				"aspeed,ast2400-mbox" for ast2400 SoCs
+				"aspeed,ast2500-mbox" for ast2500 SoCs
+
+- reg:			Contains the mailbox address register range (base
+				address and length). Keeping in mind that if the node
+				exists within the LPC host node and that base is
+				relative to that.
+
+- interrupts:	Contains interrupt information for the mailbox device.
+
+- #mbox-cells:	Common property, should be 1.
+
+Example:
+--------
+
+mbox: mbox@180 {
+	compatible = "aspeed,ast2400-mbox";
+	reg = <0x180 0x5c>;
+	interrupts = <46>;
+	#mbox-cells = <1>;
+};
+
-- 
2.11.0