rtc: pcf8563: let the core handle the alarm resolution

Set RTC_FEATURE_ALARM_RES_MINUTE, so the core knows alarms have a
resolution of a minute. Also, the core will properly round down the alarm
instead of up.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20220309162301.61679-16-alexandre.belloni@bootlin.com

drivers/rtc/rtc-pcf8563.c

@@ -330,19 +330,6 @@ static int pcf8563_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm)
 	unsigned char buf[4];
 	int err;
 
-	/* The alarm has no seconds, round up to nearest minute */
-	if (tm->time.tm_sec) {
-		time64_t alarm_time = rtc_tm_to_time64(&tm->time);
-
-		alarm_time += 60 - tm->time.tm_sec;
-		rtc_time64_to_tm(alarm_time, &tm->time);
-	}
-
-	dev_dbg(dev, "%s, min=%d hour=%d wday=%d mday=%d "
-		"enabled=%d pending=%d\n", __func__,
-		tm->time.tm_min, tm->time.tm_hour, tm->time.tm_wday,
-		tm->time.tm_mday, tm->enabled, tm->pending);
-
 	buf[0] = bin2bcd(tm->time.tm_min);
 	buf[1] = bin2bcd(tm->time.tm_hour);
 	buf[2] = bin2bcd(tm->time.tm_mday);
@@ -566,6 +553,7 @@ static int pcf8563_probe(struct i2c_client *client,
 	pcf8563->rtc->ops = &pcf8563_rtc_ops;
 	/* the pcf8563 alarm only supports a minute accuracy */
 	pcf8563->rtc->uie_unsupported = 1;
+	set_bit(RTC_FEATURE_ALARM_RES_MINUTE, pcf8563->rtc->features);
 	pcf8563->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
 	pcf8563->rtc->range_max = RTC_TIMESTAMP_END_2099;
 	pcf8563->rtc->set_start_time = true;