ARM: at91: at91sam9n12: add DT parameters to enable PMECC

Default ecc correctable setting is 2bits in 512 bytes.

Signed-off-by: Josh Wu <josh.wu@atmel.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
diff --git a/arch/arm/boot/dts/at91sam9n12ek.dts b/arch/arm/boot/dts/at91sam9n12ek.dts
index 0376bf4..d400f8d 100644
--- a/arch/arm/boot/dts/at91sam9n12ek.dts
+++ b/arch/arm/boot/dts/at91sam9n12ek.dts
@@ -71,7 +71,10 @@
 
 		nand0: nand@40000000 {
 			nand-bus-width = <8>;
-			nand-ecc-mode = "soft";
+			nand-ecc-mode = "hw";
+			atmel,has-pmecc;
+			atmel,pmecc-cap = <2>;
+			atmel,pmecc-sector-size = <512>;
 			nand-on-flash-bbt;
 			status = "okay";
 		};