mfd: input: rtc: mc13783: Remove deprecated mc13xxx_irq_ack()

mc13xxx_irq_ack() got deprecated and became dead code with commit
10f9edaeaa30 ("mfd: mc13xxx: Use regmap irq framework for interrupts").
It should be safe to remove it now.

Signed-off-by: Alexander Kurz <[e-mail]>
Acked-by: Alexandre Belloni <[e-mail]>
Acked-by: Uwe Kleine-König <[e-mail]>
Acked-by: Dmitry Torokhov <[e-mail]> # for input
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Lee Jones <[e-mail]>

drivers/input/misc/mc13783-pwrbutton.c

···
 	struct mc13783_pwrb *priv = _priv;
 	int val;
 
-	mc13xxx_irq_ack(priv->mc13783, irq);
 	mc13xxx_reg_read(priv->mc13783, MC13783_REG_INTERRUPT_SENSE_1, &val);
 
 	switch (irq) {

drivers/input/touchscreen/mc13783_ts.c

···
 {
 	struct mc13783_ts_priv *priv = data;
 
-	mc13xxx_irq_ack(priv->mc13xxx, irq);
-
 	/*
 	 * Kick off reading coordinates. Note that if work happens already
 	 * be queued for future execution (it rearms itself) it will not
···
 	int ret;
 
 	mc13xxx_lock(priv->mc13xxx);
-
-	mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_TS);
 
 	ret = mc13xxx_irq_request(priv->mc13xxx, MC13XXX_IRQ_TS,
 		mc13783_ts_handler, MC13783_TS_NAME, priv);

drivers/rtc/rtc-mc13xxx.c

···
 	}
 
 	if (!priv->valid) {
-		ret = mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_RTCRST);
-		if (unlikely(ret))
-			goto out;
-
 		ret = mc13xxx_irq_unmask(priv->mc13xxx, MC13XXX_IRQ_RTCRST);
 	}
 
···
 	if (unlikely(ret))
 		goto out;
 
-	ret = mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_TODA);
-	if (unlikely(ret))
-		goto out;
-
 	s1970 = rtc_tm_to_time64(&alarm->time);
 
 	dev_dbg(dev, "%s: %s %lld\n", __func__, alarm->enabled ? "on" : "off",
···
 static irqreturn_t mc13xxx_rtc_alarm_handler(int irq, void *dev)
 {
 	struct mc13xxx_rtc *priv = dev;
-	struct mc13xxx *mc13xxx = priv->mc13xxx;
 
 	rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_AF);
-
-	mc13xxx_irq_ack(mc13xxx, irq);
 
 	return IRQ_HANDLED;
 }
···
 	priv->rtc->range_max = (timeu64_t)(1 << 15) * SEC_PER_DAY - 1;
 
 	mc13xxx_lock(mc13xxx);
-
-	mc13xxx_irq_ack(mc13xxx, MC13XXX_IRQ_RTCRST);
 
 	ret = mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_RTCRST,
 			mc13xxx_rtc_reset_handler, DRIVER_NAME, priv);

include/linux/mfd/mc13xxx.h

···
 		unsigned int mode, unsigned int channel,
 		u8 ato, bool atox, unsigned int *sample);
 
-/* Deprecated calls */
-static inline int mc13xxx_irq_ack(struct mc13xxx *mc13xxx, int irq)
-{
-	return 0;
-}
-
 static inline int mc13xxx_irq_request_nounmask(struct mc13xxx *mc13xxx, int irq,
 					       irq_handler_t handler,
 					       const char *name, void *dev)