ARM: at91: introduce basic SAMA5D4 support

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index b11ad54..7b44db2 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -101,6 +101,10 @@
 		bool "Kernel low-level debugging on 9263 and 9g45"
 		depends on HAVE_AT91_DBGU1
 
+	config AT91_DEBUG_LL_DBGU2
+		bool "Kernel low-level debugging on sama5d4"
+		depends on HAVE_AT91_DBGU2
+
 	config DEBUG_BCM2835
 		bool "Kernel low-level debugging on BCM2835 PL011 UART"
 		depends on ARCH_BCM2835