Documentation: dt: socfpga: Add Arria10 DMA EDAC binding

Add the device tree bindings needed to support the Altera DMA FIFO
buffer on the Arria10 chip.
Signed-off-by: Thor Thayer <tthayer@opensource.altera.com>
Acked-by: Rob Herring <robh+dt@kernel.org>
Cc: devicetree@vger.kernel.org
Cc: dinguyen@opensource.altera.com
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/1468512408-5156-3-git-send-email-tthayer@opensource.altera.comSigned-off-by: Borislav Petkov <bp@suse.de>

Documentation/devicetree/bindings/arm/altera/socfpga-eccmgr.txt

@@ -98,6 +98,14 @@ Required Properties:
 - interrupts      : Should be single bit error interrupt, then double bit error
 	interrupt, in this order.
 
+DMA FIFO ECC
+Required Properties:
+- compatible      : Should be "altr,socfpga-dma-ecc"
+- reg             : Address and size for ECC block registers.
+- altr,ecc-parent : phandle to parent DMA node.
+- interrupts      : Should be single bit error interrupt, then double bit error
+	interrupt, in this order.
+
 Example:
 
 	eccmgr: eccmgr@ffd06000 {
@@ -164,4 +172,12 @@ Example:
 			interrupts = <12 IRQ_TYPE_LEVEL_HIGH>,
 				     <44 IRQ_TYPE_LEVEL_HIGH>;
 		};
+
+		dma-ecc@ff8c8000 {
+			compatible = "altr,socfpga-dma-ecc";
+			reg = <0xff8c8000 0x400>;
+			altr,ecc-parent = <&pdma>;
+			interrupts = <10 IRQ_TYPE_LEVEL_HIGH>,
+				     <42 IRQ_TYPE_LEVEL_HIGH>;
+		};
 	};