rtc: pm8xxx: Attach wake irq to device

Attach the interrupt as a wake-irq to the device, so that:
- A corresponding wakeup source is created (and reported in e.g
  /sys/kernel/debug/wakeup_sources).
- The power subsystem take cares of arming/disarming
  irq-wake automatically on suspend/resume.
Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/1645025082-6138-1-git-send-email-loic.poulain@linaro.org

drivers/rtc/rtc-pm8xxx.c

@@ -7,6 +7,7 @@
 #include <linux/rtc.h>
 #include <linux/platform_device.h>
 #include <linux/pm.h>
+#include <linux/pm_wakeirq.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
@@ -527,40 +528,28 @@ static int pm8xxx_rtc_probe(struct platform_device *pdev)
 		return rc;
 	}
 
-	return devm_rtc_register_device(rtc_dd->rtc);
-}
-
-#ifdef CONFIG_PM_SLEEP
-static int pm8xxx_rtc_resume(struct device *dev)
-{
-	struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
+	rc = devm_rtc_register_device(rtc_dd->rtc);
+	if (rc)
+		return rc;
 
-	if (device_may_wakeup(dev))
-		disable_irq_wake(rtc_dd->rtc_alarm_irq);
+	rc = dev_pm_set_wake_irq(&pdev->dev, rtc_dd->rtc_alarm_irq);
+	if (rc)
+		return rc;
 
 	return 0;
 }
 
-static int pm8xxx_rtc_suspend(struct device *dev)
+static int pm8xxx_remove(struct platform_device *pdev)
 {
-	struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
-
-	if (device_may_wakeup(dev))
-		enable_irq_wake(rtc_dd->rtc_alarm_irq);
-
+	dev_pm_clear_wake_irq(&pdev->dev);
 	return 0;
 }
-#endif
-
-static SIMPLE_DEV_PM_OPS(pm8xxx_rtc_pm_ops,
-			 pm8xxx_rtc_suspend,
-			 pm8xxx_rtc_resume);
 
 static struct platform_driver pm8xxx_rtc_driver = {
 	.probe		= pm8xxx_rtc_probe,
+	.remove		= pm8xxx_remove,
 	.driver	= {
 		.name		= "rtc-pm8xxx",
-		.pm		= &pm8xxx_rtc_pm_ops,
 		.of_match_table	= pm8xxx_id_table,
 	},
 };