Add bindings documentation for Zynq Quad SPI driver.

Signed-off-by: Punnaiah Choudary Kalluri <punn...@xilinx.com>
---
 .../devicetree/bindings/spi/spi-zynq-qspi.txt      |   26 ++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spi/spi-zynq-qspi.txt

diff --git a/Documentation/devicetree/bindings/spi/spi-zynq-qspi.txt 
b/Documentation/devicetree/bindings/spi/spi-zynq-qspi.txt
new file mode 100644
index 0000000..88e00f8
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/spi-zynq-qspi.txt
@@ -0,0 +1,26 @@
+Xilinx Zynq QSPI controller Device Tree Bindings
+-------------------------------------------------
+
+Required properties:
+- compatible           : Should be "xlnx,zynq-qspi-1.0".
+- reg                  : Physical base address and size of QSPI registers map.
+- interrupts           : Property with a value describing the interrupt
+                         number.
+- interrupt-parent     : Must be core interrupt controller
+- clock-names          : List of input clock names - "ref_clk", "aper_clk"
+                         (See clock bindings for details).
+- clocks               : Clock phandles (see clock bindings for details).
+
+Optional properties:
+- num-cs               : Number of chip selects used.
+
+Example:
+       qspi@e000d000 {
+               compatible = "xlnx,zynq-qspi-1.0";
+               clock-names = "ref_clk", "aper_clk";
+               clocks = <&clkc 10>, <&clkc 43>;
+               interrupt-parent = <&ps7_scugic_0>;
+               interrupts = <0 19 4>;
+               num-cs = /bits/ 16 <1>;
+               reg = <0xe000d000 0x1000>;
+       };
-- 
1.7.9.5


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