rtc: pcf2123: use rtc_lock/rtc_unlock

Avoid accessing directly rtc->ops_lock and use the RTC core helpers.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210119220653.677750-10-alexandre.belloni@bootlin.com

drivers/rtc/rtc-pcf2123.c

@@ -307,11 +307,10 @@ static int pcf2123_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
 static irqreturn_t pcf2123_rtc_irq(int irq, void *dev)
 {
 	struct pcf2123_data *pcf2123 = dev_get_drvdata(dev);
-	struct mutex *lock = &pcf2123->rtc->ops_lock;
 	unsigned int val = 0;
 	int ret = IRQ_NONE;
 
-	mutex_lock(lock);
+	rtc_lock(pcf2123->rtc);
 	regmap_read(pcf2123->map, PCF2123_REG_CTRL2, &val);
 
 	/* Alarm? */
@@ -324,7 +323,7 @@ static irqreturn_t pcf2123_rtc_irq(int irq, void *dev)
 		rtc_update_irq(pcf2123->rtc, 1, RTC_IRQF | RTC_AF);
 	}
 
-	mutex_unlock(lock);
+	rtc_unlock(pcf2123->rtc);
 
 	return ret;
 }