[PATCH 2/3] dts: Adding docs for Xilinx LogiCORE IP mailbox driver.

[Moritz Fischer <moritz.fischer@ettus.com>]

Signed-off-by: Moritz Fischer <moritz.fischer@ettus.com>
---
 .../bindings/mailbox/xilinx-mailbox.txt         | 40 ++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/Documentation/devicetree/bindings/mailbox/xilinx-mailbox.txt b/Documentation/devicetree/bindings/mailbox/xilinx-mailbox.txt
new file mode 100644
index 0000000..e559743
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/xilinx-mailbox.txt
@@ -0,0 +1,40 @@
+Xilinx Mailbox Driver
+=====================
+
+Required properties:
+- compatible :	"xlnx,mailbox-2.1".
+- reg : 	physical base address of the mailbox and length of
+		memory mapped region.
+- #mbox-cells:	Common mailbox binding property to identify the number
+		of cells required for the mailbox specifier. Should be 1.
+
+Optional properties:
+- interrupt-parent :	interrupt source phandle.
+- interrupts :		interrupt number. The interrupt specifier format
+			depends on the interrupt controller parent.
+
+Example:
+	mbox: mailbox@0x40400000 {
+		compatible = "xlnx,axi-mailbox-2.1";
+		reg = <0x100 0x3c>;
+		interrupt-parent = <&intc>;
+		interrupts = <5>;
+		#mbox-cells = <1>;
+	};
+
+Mailbox client
+===============
+"mboxes" and the optional "mbox-names" (please see
+Documentation/devicetree/bindings/mailbox/mailbox.txt for details). Each value
+of the mboxes property should contain a phandle to the mailbox controller
+device node and second argument is the channel index. It must be 0 (hardware
+support only one channel).The equivalent "mbox-names" property value can be
+used to give a name to the communication channel to be used by the client user.
+
+Example:
+	mclient0: mclient0@0x400 {
+		compatible = "client-1.0";
+		reg = <0x400 0x10>;
+		mbox-names = "mbox", "mbox-rx";
+		mboxes = <&mbox 0>;
+	};
-- 
2.4.1