ARM: EXYNOS: Add support for rtc wakeup

Set the gic arch extension callback to support rtc wakeup.
Signed-off-by: Inderpal Singh <inderpal.singh@samsung.com>
Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/mach-exynos/common.c

@@ -647,6 +647,8 @@ void __init exynos5_init_irq(void)
 	 * uses GIC instead of VIC.
 	 */
 	s5p_init_irq(NULL, 0);
+
+	gic_arch_extn.irq_set_wake = s3c_irq_wake;
 }
 
 struct bus_type exynos_subsys = {

arch/arm/plat-samsung/include/plat/pm.h

@@ -107,10 +107,12 @@ extern void s3c_pm_do_restore(struct sleep_save *ptr, int count);
 extern void s3c_pm_do_restore_core(struct sleep_save *ptr, int count);
 
 #ifdef CONFIG_PM
+extern int s3c_irq_wake(struct irq_data *data, unsigned int state);
 extern int s3c_irqext_wake(struct irq_data *data, unsigned int state);
 extern int s3c24xx_irq_suspend(void);
 extern void s3c24xx_irq_resume(void);
 #else
+#define s3c_irq_wake NULL
 #define s3c_irqext_wake NULL
 #define s3c24xx_irq_suspend NULL
 #define s3c24xx_irq_resume  NULL