rtc: puv3: switch to devm_rtc_allocate_device()/rtc_register_device()

Use managed RTC device allocation as this allows for further cleanup.
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

drivers/rtc/rtc-puv3.c

@@ -222,10 +222,6 @@ static void puv3_rtc_enable(struct device *dev, int en)
 
 static int puv3_rtc_remove(struct platform_device *dev)
 {
-	struct rtc_device *rtc = platform_get_drvdata(dev);
-
-	rtc_device_unregister(rtc);
-
 	puv3_rtc_setpie(&dev->dev, 0);
 	puv3_rtc_setaie(&dev->dev, 0);
 
@@ -259,6 +255,10 @@ static int puv3_rtc_probe(struct platform_device *pdev)
 	dev_dbg(&pdev->dev, "PKUnity_rtc: tick irq %d, alarm irq %d\n",
 		 puv3_rtc_tickno, puv3_rtc_alarmno);
 
+	rtc = devm_rtc_allocate_device(&pdev->dev);
+	if (IS_ERR(rtc))
+		return PTR_ERR(rtc);
+
 	/* get the memory region */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (res == NULL) {
@@ -278,12 +278,10 @@ static int puv3_rtc_probe(struct platform_device *pdev)
 	puv3_rtc_enable(&pdev->dev, 1);
 
 	/* register RTC and exit */
-	rtc = rtc_device_register("pkunity", &pdev->dev, &puv3_rtcops,
-				  THIS_MODULE);
-
-	if (IS_ERR(rtc)) {
+	rtc->ops = &puv3_rtcops;
+	ret = rtc_register_device(rtc);
+	if (ret) {
 		dev_err(&pdev->dev, "cannot attach rtc\n");
-		ret = PTR_ERR(rtc);
 		goto err_nortc;
 	}