[PATCH] rtc: mv: add suspend/resume support for wakeup

[Xue Lei]

Add PM suspend/resume callbacks to enable/disable IRQ wake for the
RTC alarm interrupt. This allows the RTC alarm to wake the system
from STR (e.g. via rtcwake -m mem -s N).

Without this, the RTC IRQ is masked during suspend by the MPIC's
IRQCHIP_MASK_ON_SUSPEND behavior, preventing alarm-based wakeup.

Signed-off-by: Xue Lei <Xue.Lei@xxxxxxxxxxxxx>
---
 drivers/rtc/rtc-mv.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/rtc/rtc-mv.c b/drivers/rtc/rtc-mv.c
index db31da56bfa7..55fa937f9f70 100644
--- a/drivers/rtc/rtc-mv.c
+++ b/drivers/rtc/rtc-mv.c
@@ -301,6 +301,28 @@ static const struct of_device_id rtc_mv_of_match_table[] = {
 MODULE_DEVICE_TABLE(of, rtc_mv_of_match_table);
 #endif
 
+#ifdef CONFIG_PM_SLEEP
+static int mv_rtc_suspend(struct device *dev)
+{
+	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
+
+	if (device_may_wakeup(dev) && pdata->irq >= 0)
+		enable_irq_wake(pdata->irq);
+	return 0;
+}
+
+static int mv_rtc_resume(struct device *dev)
+{
+	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
+
+	if (device_may_wakeup(dev) && pdata->irq >= 0)
+		disable_irq_wake(pdata->irq);
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(mv_rtc_pm_ops, mv_rtc_suspend, mv_rtc_resume);
+
 /*
  * mv_rtc_remove() lives in .exit.text. For drivers registered via
  * module_platform_driver_probe() this is ok because they cannot get unbound at
@@ -312,6 +334,7 @@ static struct platform_driver mv_rtc_driver __refdata = {
 	.driver		= {
 		.name	= "rtc-mv",
 		.of_match_table = of_match_ptr(rtc_mv_of_match_table),
+		.pm	= &mv_rtc_pm_ops,
 	},
 };
 
-- 
2.49.1