rtc: remove uie_unsupported

uie_unsupported is not used by any drivers anymore, remove it.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20220309162301.61679-29-alexandre.belloni@bootlin.com

drivers/rtc/class.c

@@ -399,9 +399,6 @@ int __devm_rtc_register_device(struct module *owner, struct rtc_device *rtc)
 	if (!rtc->ops->set_alarm)
 		clear_bit(RTC_FEATURE_ALARM, rtc->features);
 
-	if (rtc->uie_unsupported)
-		clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, rtc->features);
-
 	if (rtc->ops->set_offset)
 		set_bit(RTC_FEATURE_CORRECTION, rtc->features);
 

include/linux/rtc.h

@@ -110,8 +110,6 @@ struct rtc_device {
 	struct hrtimer pie_timer; /* sub second exp, so needs hrtimer */
 	int pie_enabled;
 	struct work_struct irqwork;
-	/* Some hardware can't support UIE mode */
-	int uie_unsupported;
 
 	/*
 	 * This offset specifies the update timing of the RTC.