dt-bindings, EDAC: Add Aspeed AST2500

Add support for EDAC on the Aspeed AST2500 SoC.

Signed-off-by: Stefan M Schaeckeler <[e-mail]>
Signed-off-by: Borislav Petkov <[e-mail]>
Reviewed-by: Andrew Jeffery <[e-mail]>
Cc: Joel Stanley <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Mauro Carvalho Chehab <[e-mail]>
Cc: Rob Herring <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Cc: linux-edac <[e-mail]>
Link: https://lkml.kernel.org/r/[e-mail]

Documentation/devicetree/bindings/edac/aspeed-sdram-edac.txt

···
+Aspeed AST2500 SoC EDAC node
+
+The Aspeed AST2500 SoC supports DDR3 and DDR4 memory with and without ECC (error
+correction check).
+
+The memory controller supports SECDED (single bit error correction, double bit
+error detection) and single bit error auto scrubbing by reserving 8 bits for
+every 64 bit word (effectively reducing available memory to 8/9).
+
+Note, the bootloader must configure ECC mode in the memory controller.
+
+
+Required properties:
+- compatible: should be "aspeed,ast2500-sdram-edac"
+- reg:        sdram controller register set should be <0x1e6e0000 0x174>
+- interrupts: should be AVIC interrupt #0
+
+
+Example:
+
+	edac: sdram@1e6e0000 {
+		compatible = "aspeed,ast2500-sdram-edac";
+		reg = <0x1e6e0000 0x174>;
+		interrupts = <0>;
+	};