ARM: 8890/1: l2x0: add marvell,ecc-enable property for aurora

The aurora cache on the Marvell Armada-XP SoC supports ECC protection
for the L2 data arrays. Add a "marvell,ecc-enable" device tree property
which can be used to enable this.

[jlu@pengutronix.de: use aurora specific define AURORA_ACR_ECC_EN]
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

arch/arm/mm/cache-l2x0.c

@@ -1493,6 +1493,11 @@ static void __init aurora_of_parse(const struct device_node *np,
 		mask |= AURORA_ACR_FORCE_WRITE_POLICY_MASK;
 	}
 
+	if (of_property_read_bool(np, "marvell,ecc-enable")) {
+		mask |= AURORA_ACR_ECC_EN;
+		val |= AURORA_ACR_ECC_EN;
+	}
+
 	if (of_property_read_bool(np, "arm,parity-enable")) {
 		mask |= AURORA_ACR_PARITY_EN;
 		val |= AURORA_ACR_PARITY_EN;