rtc: jz4740: switch to rtc_time64_to_tm/rtc_tm_to_time64

Call the 64bit versions of rtc_tm time conversion now that the range is
enforced by the core.

Tested-by: Mathieu Malaterre <malat@debian.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-jz4740.c

@@ -171,7 +171,7 @@ static int jz4740_rtc_read_time(struct device *dev, struct rtc_time *time)
 	if (timeout == 0)
 		return -EIO;
 
-	rtc_time_to_tm(secs, time);
+	rtc_time64_to_tm(secs, time);
 
 	return 0;
 }
@@ -196,7 +196,7 @@ static int jz4740_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 	alrm->enabled = !!(ctrl & JZ_RTC_CTRL_AE);
 	alrm->pending = !!(ctrl & JZ_RTC_CTRL_AF);
 
-	rtc_time_to_tm(secs, &alrm->time);
+	rtc_time64_to_tm(secs, &alrm->time);
 
 	return rtc_valid_tm(&alrm->time);
 }
@@ -205,9 +205,7 @@ static int jz4740_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
 	int ret;
 	struct jz4740_rtc *rtc = dev_get_drvdata(dev);
-	unsigned long secs;
-
-	rtc_tm_to_time(&alrm->time, &secs);
+	uint32_t secs = lower_32_bits(rtc_tm_to_time64(&alrm->time));
 
 	ret = jz4740_rtc_reg_write(rtc, JZ_REG_RTC_SEC_ALARM, secs);
 	if (!ret)