Documentation: binding: Add documentation for jesd204b

Add DT binding for jesd204b.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

diff --git a/Documentation/devicetree/bindings/misc/jesd204b.txt b/Documentation/devicetree/bindings/misc/jesd204b.txt
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+* Xilinx JESD204B core
+
+Description:
+The LogiCORE™ IP JESD204 core implements a JESD204B core
+
+Required properties:
+- compatible = Should be one of
+               "xlnx,jesd204-5.1";
+               "xlnx,jesd204-5.2";
+               "xlnx,jesd204-6.1";
+- reg = Should contain JESD204B registers location and length
+- xlnx,frames-per-multiframe = No of frames per multiframe
+- xlnx,bytes-per-frame = No of bytes per frame
+- xlnx,lanes = No of Lanes
+- xlnx,subclass = subclass
+- xlnx,node-is-transmit = should be present only for transmit nodes
+
+Example:
+++++++++
+jesd_Tx_axi_0: jesd_Tx@44a20000 {
+       compatible = "xlnx,jesd204-5.1";
+       reg = <0x44a20000 0x10000>;
+       xlnx,frames-per-multiframe = <30>;
+       xlnx,bytes-per-frame = <2>;
+       xlnx,subclass = <1>;
+       xlnx,lanes = <0x2>;
+       xlnx,node-is-transmit;
+};