rtc: imx-sc: remove .read_alarm

The RTC core properly handles RTC without .read_alarm and doesn't use it to
set alarms. .read_alarm can be safely dropped.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Link: https://lore.kernel.org/r/20210417235205.994119-1-alexandre.belloni@bootlin.com

drivers/rtc/rtc-imx-sc.c

@@ -80,16 +80,6 @@ static int imx_sc_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
 	return imx_scu_irq_group_enable(SC_IRQ_GROUP_RTC, SC_IRQ_RTC, enable);
 }
 
-static int imx_sc_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
-{
-	/*
-	 * SCU firmware does NOT provide read alarm API, but .read_alarm
-	 * callback is required by RTC framework to support alarm function,
-	 * so just return here.
-	 */
-	return 0;
-}
-
 static int imx_sc_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
 	struct imx_sc_msg_timer_rtc_set_alarm msg;
@@ -127,7 +117,6 @@ static int imx_sc_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 static const struct rtc_class_ops imx_sc_rtc_ops = {
 	.read_time = imx_sc_rtc_read_time,
 	.set_time = imx_sc_rtc_set_time,
-	.read_alarm = imx_sc_rtc_read_alarm,
 	.set_alarm = imx_sc_rtc_set_alarm,
 	.alarm_irq_enable = imx_sc_rtc_alarm_irq_enable,
 };