devicetree: Add devicetree bindings documentation for Zynq QSPI

Add bindings documentation for Zynq QSPI driver.

Signed-off-by: Harini Katakam <harinik@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

diff --git a/Documentation/devicetree/bindings/spi/spi-zynq-qspi.txt b/Documentation/devicetree/bindings/spi/spi-zynq-qspi.txt
new file mode 100644 (file)
index 0000000..47472fd
--- /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", "pclk"
+                         (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", "pclk";
+               clocks = <&clkc 10>, <&clkc 43>;
+               interrupt-parent = <&intc>;
+               interrupts = <0 19 4>;
+               num-cs = <1>;
+               reg = <0xe000d000 0x1000>;
+       } ;