dt-bindings: fpga: Add compatible value for Xilinx DFX AXI shutdown manager

This patch Adds compatible value for Xilinx Dynamic Function eXchnage(DFX)
AXI Shutdown manager IP.
Signed-off-by: Nava kishore Manne <nava.manne@xilinx.com>
Reviewed-by: Tom Rix <trix@redhat.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Moritz Fischer <mdf@kernel.org>

Documentation/devicetree/bindings/fpga/xilinx-pr-decoupler.txt

@@ -7,13 +7,24 @@ changes from passing through the bridge.  The controller can also
 couple / enable the bridges which allows traffic to pass through the
 bridge normally.
 
+Xilinx LogiCORE Dynamic Function eXchange(DFX) AXI shutdown manager
+Softcore is compatible with the Xilinx LogiCORE pr-decoupler.
+
+The Dynamic Function eXchange AXI shutdown manager prevents AXI traffic
+from passing through the bridge. The controller safely handles AXI4MM
+and AXI4-Lite interfaces on a Reconfigurable Partition when it is
+undergoing dynamic reconfiguration, preventing the system deadlock
+that can occur if AXI transactions are interrupted by DFX
+
 The Driver supports only MMIO handling. A PR region can have multiple
 PR Decouplers which can be handled independently or chained via decouple/
 decouple_status signals.
 
 Required properties:
 - compatible		: Should contain "xlnx,pr-decoupler-1.00" followed by
-                          "xlnx,pr-decoupler"
+                          "xlnx,pr-decoupler" or
+                          "xlnx,dfx-axi-shutdown-manager-1.00" followed by
+                          "xlnx,dfx-axi-shutdown-manager"
 - regs			: base address and size for decoupler module
 - clocks		: input clock to IP
 - clock-names		: should contain "aclk"
@@ -22,6 +33,7 @@ See Documentation/devicetree/bindings/fpga/fpga-region.txt and
 Documentation/devicetree/bindings/fpga/fpga-bridge.txt for generic bindings.
 
 Example:
+Partial Reconfig Decoupler:
 	fpga-bridge@100000450 {
 		compatible = "xlnx,pr-decoupler-1.00",
 			     "xlnx-pr-decoupler";
@@ -30,3 +42,13 @@ Example:
 		clock-names = "aclk";
 		bridge-enable = <0>;
 	};
+
+Dynamic Function eXchange AXI shutdown manager:
+	fpga-bridge@100000450 {
+		compatible = "xlnx,dfx-axi-shutdown-manager-1.00",
+			     "xlnx,dfx-axi-shutdown-manager";
+		regs = <0x10000045 0x10>;
+		clocks = <&clkc 15>;
+		clock-names = "aclk";
+		bridge-enable = <0>;
+	};