Add device tree binding documentation for the driver in spi/spi-xilinx.c.
Signed-off-by: Jens Renner <renner@xxxxxxxxxxx>
---
diff --git a/Documentation/devicetree/bindings/spi/spi-xilinx.txt b/Documentation/devicetree/bindings/spi/spi-xilinx.txt
new file mode 100644
index 0000000..768a1ea
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/spi-xilinx.txt
@@ -0,0 +1,32 @@
+Xilinx SPI controller:
+
+Required properties:
+- compatible : Must be "xlnx,axi-1.02.a" or "xlnx,xps-spi-2.00.a"
+- interrupt-parent : reference to parent interrupt controller
+- interrupts : SPI controller interrupt
+- reg : SPI register location and length
+
+Optional properties:
+- xlnx,num-ss-bits : # of slave select bits
+- xlnx,num-transfer_bits : # of data transfer bits (defaults to 8)
+- xlnx,... : not considered by kernel module
+- #address-cells = <1> : if child nodes are defined
+- #size-cells = <0> : if child nodes are defined
+- Child nodes conforming to SPI bus binding
+
+Example with 3 slave select bits and 32 bit transfer size:
+
+ axi_spi_0: spi@40a00000 {
+ compatible = "xlnx,axi-spi-1.02.a", "xlnx,xps-spi-2.00.a";
+ interrupt-parent = <&axi_intc_0>;
+ interrupts = < 2 2 >;
+ reg = < 0x40a00000 0x10000 >;
+ xlnx,family = "spartan6";
+ xlnx,fifo-exist = <0x1>;
+ xlnx,instance = "axi_spi_0";
+ xlnx,num-ss-bits = <0x3>;
+ xlnx,num-transfer-bits = <0x20>;
+ xlnx,sck-ratio = <0x4>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ };
--
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