rtc: imxdi: add wakeup support

The DryIce-based RTC supports alarms that trigger an interrupt.

Configure this interrupt as a wakeup source that wakes the system up
from standby mode.

Signed-off-by: Martin Kaiser <[e-mail]>
Signed-off-by: Alexandre Belloni <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/rtc/rtc-imxdi.c

···
 #include <linux/delay.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/pm_wakeirq.h>
 #include <linux/rtc.h>
 #include <linux/sched.h>
 #include <linux/spinlock.h>
···
 	}
 
 	platform_set_drvdata(pdev, imxdi);
+
+	device_init_wakeup(&pdev->dev, true);
+	dev_pm_set_wake_irq(&pdev->dev, norm_irq);
 
 	imxdi->rtc->ops = &dryice_rtc_ops;
 	imxdi->rtc->range_max = U32_MAX;