drivers/rtc/rtc-as3722: use devm for rtc and irq registration

Use devm_* calls for rtc and irq registration and get rid of
remove callback for platform driver.
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Cc: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/rtc/rtc-as3722.c

@@ -198,7 +198,7 @@ static int as3722_rtc_probe(struct platform_device *pdev)
 
 	device_init_wakeup(&pdev->dev, 1);
 
-	as3722_rtc->rtc = rtc_device_register("as3722", &pdev->dev,
+	as3722_rtc->rtc = devm_rtc_device_register(&pdev->dev, "as3722-rtc",
 				&as3722_rtc_ops, THIS_MODULE);
 	if (IS_ERR(as3722_rtc->rtc)) {
 		ret = PTR_ERR(as3722_rtc->rtc);
@@ -209,28 +209,16 @@ static int as3722_rtc_probe(struct platform_device *pdev)
 	as3722_rtc->alarm_irq = platform_get_irq(pdev, 0);
 	dev_info(&pdev->dev, "RTC interrupt %d\n", as3722_rtc->alarm_irq);
 
-	ret = request_threaded_irq(as3722_rtc->alarm_irq, NULL,
+	ret = devm_request_threaded_irq(&pdev->dev, as3722_rtc->alarm_irq, NULL,
 			as3722_alarm_irq, IRQF_ONESHOT | IRQF_EARLY_RESUME,
 			"rtc-alarm", as3722_rtc);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to request alarm IRQ %d: %d\n",
 				as3722_rtc->alarm_irq, ret);
-		goto scrub;
+		return ret;
 	}
 	disable_irq(as3722_rtc->alarm_irq);
 	return 0;
-scrub:
-	rtc_device_unregister(as3722_rtc->rtc);
-	return ret;
-}
-
-static int as3722_rtc_remove(struct platform_device *pdev)
-{
-	struct as3722_rtc *as3722_rtc = platform_get_drvdata(pdev);
-
-	free_irq(as3722_rtc->alarm_irq, as3722_rtc);
-	rtc_device_unregister(as3722_rtc->rtc);
-	return 0;
 }
 
 #ifdef CONFIG_PM_SLEEP
@@ -260,7 +248,6 @@ static const struct dev_pm_ops as3722_rtc_pm_ops = {
 
 static struct platform_driver as3722_rtc_driver = {
 	.probe = as3722_rtc_probe,
-	.remove = as3722_rtc_remove,
 	.driver = {
 		.name = "as3722-rtc",
 		.pm = &as3722_rtc_pm_ops,