rtc: ds1511: remove ds1511_rtc_update_alarm

ds1511_rtc_update_alarm is called twice but one of the call is overkill as
it only has to enable or disable the alarm instead of updating all the alarm
registers. Merge it in its main call site and introduce a new finction to
enable or disable the alarm.

Link: https://lore.kernel.org/r/20240227230431.1837717-7-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-ds1511.c

@@ -178,35 +178,15 @@ static int ds1511_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm)
 	return 0;
 }
 
-/*
- * write the alarm register settings
- *
- * we only have the use to interrupt every second, otherwise
- * known as the update interrupt, or the interrupt if the whole
- * date/hours/mins/secs matches.  the ds1511 has many more
- * permutations, but the kernel doesn't.
- */
-static void ds1511_rtc_update_alarm(struct rtc_plat_data *pdata)
+static void ds1511_rtc_alarm_enable(unsigned int enabled)
 {
-	unsigned long flags;
-
-	spin_lock_irqsave(&pdata->lock, flags);
-	rtc_write(pdata->alrm_mday < 0 ? 0x80 : bin2bcd(pdata->alrm_mday) & 0x3f,
-	       DS1511_AM4_DATE);
-	rtc_write(pdata->alrm_hour < 0 ? 0x80 : bin2bcd(pdata->alrm_hour) & 0x3f,
-	       DS1511_AM3_HOUR);
-	rtc_write(pdata->alrm_min < 0 ? 0x80 : bin2bcd(pdata->alrm_min) & 0x7f,
-	       DS1511_AM2_MIN);
-	rtc_write(pdata->alrm_sec < 0 ? 0x80 : bin2bcd(pdata->alrm_sec) & 0x7f,
-	       DS1511_AM1_SEC);
-	rtc_write(rtc_read(DS1511_CONTROL_B) | (pdata->irqen ? DS1511_TIE : 0), DS1511_CONTROL_B);
-	rtc_read(DS1511_CONTROL_A);	/* clear interrupts */
-	spin_unlock_irqrestore(&pdata->lock, flags);
+	rtc_write(rtc_read(DS1511_CONTROL_B) | (enabled ? DS1511_TIE : 0), DS1511_CONTROL_B);
 }
 
 static int ds1511_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
 	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
+	unsigned long flags;
 
 	if (pdata->irq <= 0)
 		return -EINVAL;
@@ -218,7 +198,20 @@ static int ds1511_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 	if (alrm->enabled)
 		pdata->irqen |= RTC_AF;
 
-	ds1511_rtc_update_alarm(pdata);
+	spin_lock_irqsave(&pdata->lock, flags);
+	rtc_write(pdata->alrm_mday < 0 ? 0x80 : bin2bcd(pdata->alrm_mday) & 0x3f,
+	       DS1511_AM4_DATE);
+	rtc_write(pdata->alrm_hour < 0 ? 0x80 : bin2bcd(pdata->alrm_hour) & 0x3f,
+	       DS1511_AM3_HOUR);
+	rtc_write(pdata->alrm_min < 0 ? 0x80 : bin2bcd(pdata->alrm_min) & 0x7f,
+	       DS1511_AM2_MIN);
+	rtc_write(pdata->alrm_sec < 0 ? 0x80 : bin2bcd(pdata->alrm_sec) & 0x7f,
+	       DS1511_AM1_SEC);
+	ds1511_rtc_alarm_enable(alrm->enabled);
+
+	rtc_read(DS1511_CONTROL_A);	/* clear interrupts */
+	spin_unlock_irqrestore(&pdata->lock, flags);
+
 	return 0;
 }
 
@@ -258,14 +251,15 @@ static irqreturn_t ds1511_interrupt(int irq, void *dev_id)
 static int ds1511_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
 {
 	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
+	unsigned long flags;
 
 	if (pdata->irq <= 0)
 		return -EINVAL;
-	if (enabled)
-		pdata->irqen |= RTC_AF;
-	else
-		pdata->irqen &= ~RTC_AF;
-	ds1511_rtc_update_alarm(pdata);
+
+	spin_lock_irqsave(&pdata->lock, flags);
+	ds1511_rtc_alarm_enable(enabled);
+	spin_unlock_irqrestore(&pdata->lock, flags);
+
 	return 0;
 }