rtc: sun6i: Switch to devm_rtc_device_register

Now that we have a devm variant of rtc_device_register, switch to it.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

drivers/rtc/rtc-sun6i.c

@@ -543,7 +543,7 @@ static int sun6i_rtc_probe(struct platform_device *pdev)
 
 	clk_prepare_enable(chip->losc);
 
-	chip->rtc = rtc_device_register("rtc-sun6i", &pdev->dev,
+	chip->rtc = devm_rtc_device_register(&pdev->dev, "rtc-sun6i",
 					     &sun6i_rtc_ops, THIS_MODULE);
 	if (IS_ERR(chip->rtc)) {
 		dev_err(&pdev->dev, "unable to register device\n");
@@ -555,15 +555,6 @@ static int sun6i_rtc_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int sun6i_rtc_remove(struct platform_device *pdev)
-{
-	struct sun6i_rtc_dev *chip = platform_get_drvdata(pdev);
-
-	rtc_device_unregister(chip->rtc);
-
-	return 0;
-}
-
 static const struct of_device_id sun6i_rtc_dt_ids[] = {
 	{ .compatible = "allwinner,sun6i-a31-rtc" },
 	{ /* sentinel */ },
@@ -572,7 +563,6 @@ MODULE_DEVICE_TABLE(of, sun6i_rtc_dt_ids);
 
 static struct platform_driver sun6i_rtc_driver = {
 	.probe		= sun6i_rtc_probe,
-	.remove		= sun6i_rtc_remove,
 	.driver		= {
 		.name		= "sun6i-rtc",
 		.of_match_table = sun6i_rtc_dt_ids,