dt: bindings: Document ZynqMP DDRC in Synopsys documentation

Add information for ZynqMP DDRC which reports the single bit errors that
are corrected and the double bit errors that are detected.

Signed-off-by: Manish Narani <[e-mail]>
Signed-off-by: Borislav Petkov <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>
CC: Mark Rutland <[e-mail]>
CC: [e-mail]
CC: [e-mail]
CC: [e-mail]
CC: [e-mail]
CC: linux-edac <[e-mail]>
CC: [e-mail]
CC: [e-mail]
CC: [e-mail]
Link: http://lkml.kernel.org/r/[e-mail]

Documentation/devicetree/bindings/memory-controllers/synopsys.txt

···
 Binding for Synopsys IntelliDDR Multi Protocol Memory Controller
 
-This controller has an optional ECC support in half-bus width (16-bit)
-configuration. The ECC controller corrects one bit error and detects
-two bit errors.
+The ZynqMP DDR ECC controller has an optional ECC support in 64-bit and 32-bit
+bus width configurations.
+
+The Zynq DDR ECC controller has an optional ECC support in half-bus width
+(16-bit) configuration.
+
+These both ECC controllers correct single bit ECC errors and detect double bit
+ECC errors.
 
 Required properties:
- - compatible: Should be 'xlnx,zynq-ddrc-a05'
- - reg: Base address and size of the controllers memory area
+ - compatible: One of:
+	- 'xlnx,zynq-ddrc-a05' : Zynq DDR ECC controller
+	- 'xlnx,zynqmp-ddrc-2.40a' : ZynqMP DDR ECC controller
+ - reg: Should contain DDR controller registers location and length.
+
+Required properties for "xlnx,zynqmp-ddrc-2.40a":
+ - interrupts: Property with a value describing the interrupt number.
 
 Example:
 	memory-controller@f8006000 {
 		compatible = "xlnx,zynq-ddrc-a05";
 		reg = <0xf8006000 0x1000>;
+	};
+
+	mc: memory-controller@fd070000 {
+		compatible = "xlnx,zynqmp-ddrc-2.40a";
+		reg = <0x0 0xfd070000 0x0 0x30000>;
+		interrupt-parent = <&gic>;
+		interrupts = <0 112 4>;
 	};