ARM: at91: cpuidle: use init/exit common routine

Remove the duplicated code and use the cpuidle common code for initialization.
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

arch/arm/mach-at91/cpuidle.c

@@ -27,8 +27,6 @@
 
 #define AT91_MAX_STATES	2
 
-static DEFINE_PER_CPU(struct cpuidle_device, at91_cpuidle_device);
-
 /* Actual code that puts the SoC in different idle states */
 static int at91_enter_idle(struct cpuidle_device *dev,
 			struct cpuidle_driver *drv,
@@ -60,20 +58,9 @@ static struct cpuidle_driver at91_idle_driver = {
 };
 
 /* Initialize CPU idle by registering the idle states */
-static int at91_init_cpuidle(void)
+static int __init at91_init_cpuidle(void)
 {
-	struct cpuidle_device *device;
-
-	device = &per_cpu(at91_cpuidle_device, smp_processor_id());
-	device->state_count = AT91_MAX_STATES;
-
-	cpuidle_register_driver(&at91_idle_driver);
-
-	if (cpuidle_register_device(device)) {
-		printk(KERN_ERR "at91_init_cpuidle: Failed registering\n");
-		return -EIO;
-	}
-	return 0;
+	return cpuidle_register(&at91_idle_driver, NULL);
 }
 
 device_initcall(at91_init_cpuidle);