dt-bindings: serial: Add binding for uartlite

The uartlite devicetree binding was missed out.
Add the binding documentation for uartlite that is already in use.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/devicetree/bindings/serial/xlnx,opb-uartlite.txt b/Documentation/devicetree/bindings/serial/xlnx,opb-uartlite.txt
new file mode 100644 (file)
index 0000000..c37deb4
--- /dev/null
+++ b/Documentation/devicetree/bindings/serial/xlnx,opb-uartlite.txt
@@ -0,0 +1,23 @@
+Xilinx Axi Uartlite controller Device Tree Bindings
+---------------------------------------------------------
+
+Required properties:
+- compatible           : Can be either of
+                               "xlnx,xps-uartlite-1.00.a"
+                               "xlnx,opb-uartlite-1.00.b"
+- reg                  : Physical base address and size of the Axi Uartlite
+                         registers map.
+- interrupts           : Should contain the UART controller interrupt.
+
+Optional properties:
+- port-number          : Set Uart port number
+- clock-names          : Should be "s_axi_aclk"
+- clocks               : Input clock specifier. Refer to common clock bindings.
+
+Example:
+serial@800c0000 {
+       compatible = "xlnx,xps-uartlite-1.00.a";
+       reg = <0x0 0x800c0000 0x10000>;
+       interrupts = <0x0 0x6e 0x1>;
+       port-number = <0>;
+};