ARM: at91: aic add dt support for external irqs

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
diff --git a/Documentation/devicetree/bindings/arm/atmel-aic.txt b/Documentation/devicetree/bindings/arm/atmel-aic.txt
index aabca4f..1953b0c 100644
--- a/Documentation/devicetree/bindings/arm/atmel-aic.txt
+++ b/Documentation/devicetree/bindings/arm/atmel-aic.txt
@@ -15,6 +15,7 @@
       Valid combinations are 1, 2, 3, 4, 8.
       Default flag for internal sources should be set to 4 (active high).
 - reg: Should contain AIC registers location and length
+- atmel,external-irqs: u32 array of external irqs.
 
 Examples:
 	/*