rtc: pcf2127: convert to devm_rtc_allocate_device

This allows further improvement of the driver.
Signed-off-by: Bruno Thomsen <bruno.thomsen@gmail.com>
Link: https://lore.kernel.org/r/20190822131936.18772-1-bruno.thomsen@gmail.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-pcf2127.c

@@ -237,11 +237,12 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap,
 
 	dev_set_drvdata(dev, pcf2127);
 
-	pcf2127->rtc = devm_rtc_device_register(dev, name, &pcf2127_rtc_ops,
-						THIS_MODULE);
+	pcf2127->rtc = devm_rtc_allocate_device(dev);
 	if (IS_ERR(pcf2127->rtc))
 		return PTR_ERR(pcf2127->rtc);
 
+	pcf2127->rtc->ops = &pcf2127_rtc_ops;
+
 	if (has_nvmem) {
 		struct nvmem_config nvmem_cfg = {
 			.priv = pcf2127,
@@ -253,7 +254,7 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap,
 		ret = rtc_nvmem_register(pcf2127->rtc, &nvmem_cfg);
 	}
 
-	return ret;
+	return rtc_register_device(pcf2127->rtc);
 }
 
 #ifdef CONFIG_OF