ARM: at91/aic: add irq domain and device tree support

Add an irqdomain for the AIC interrupt controller.
The device tree support is mapping the registers and
is using the irq_domain_add_legacy() to manage hwirq
translation.
The documentation is describing the meaning of the
two cells required for using this "interrupt-controller"
in a device tree node.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 92c9c79c140c..cabd8f556a1f 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -322,6 +322,7 @@ config ARCH_AT91
         select ARCH_REQUIRE_GPIOLIB
         select HAVE_CLK
         select CLKDEV_LOOKUP
+        select IRQ_DOMAIN
         help
           This enables support for systems based on the Atmel AT91RM9200,
           AT91SAM9 processors.