rtc: ab8500: remove misuse of IRQF_NO_SUSPEND flag

The IRQF_NO_SUSPEND flag is used to identify the interrupts that should
be left enabled so as to allow them to work as expected during the
suspend-resume cycle, but doesn't guarantee that it will wake the system
from a suspended state, enable_irq_wake is recommended to be used for
the wakeup.

This patch removes the use of IRQF_NO_SUSPEND flags and uses newly
introduce PM wakeup APIs dev_pm_{set,clear}_wake_irq.

Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Cc: rtc-linux@googlegroups.com
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

drivers/rtc/rtc-ab8500.c

@@ -18,6 +18,7 @@
 #include <linux/mfd/abx500/ab8500.h>
 #include <linux/delay.h>
 #include <linux/of.h>
+#include <linux/pm_wakeirq.h>
 
 #define AB8500_RTC_SOFF_STAT_REG	0x00
 #define AB8500_RTC_CC_CONF_REG		0x01
@@ -493,11 +494,12 @@ static int ab8500_rtc_probe(struct platform_device *pdev)
 	}
 
 	err = devm_request_threaded_irq(&pdev->dev, irq, NULL,
-			rtc_alarm_handler, IRQF_NO_SUSPEND | IRQF_ONESHOT,
+			rtc_alarm_handler, IRQF_ONESHOT,
 			"ab8500-rtc", rtc);
 	if (err < 0)
 		return err;
 
+	dev_pm_set_wake_irq(&pdev->dev, irq);
 	platform_set_drvdata(pdev, rtc);
 
 	err = ab8500_sysfs_rtc_register(&pdev->dev);
@@ -513,6 +515,8 @@ static int ab8500_rtc_probe(struct platform_device *pdev)
 
 static int ab8500_rtc_remove(struct platform_device *pdev)
 {
+	dev_pm_clear_wake_irq(&pdev->dev);
+	device_init_wakeup(&pdev->dev, false);
 	ab8500_sysfs_rtc_unregister(&pdev->dev);
 
 	return 0;