rtc: mt6397: implement suspend/resume function in rtc-mt6397 driver

Implement the suspend/resume function in order to control rtc's irq_wake flag and handle as wakeup source.

Signed-off-by: Henry Chen <henryc.chen@mediatek.com>
Acked-by: Eddie Huang <eddie.huang@mediatek.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-mt6397.c b/drivers/rtc/rtc-mt6397.c
index eab230be5a54..30c926b36361 100644
--- a/drivers/rtc/rtc-mt6397.c
+++ b/drivers/rtc/rtc-mt6397.c
@@ -373,6 +373,31 @@ static int mtk_rtc_remove(struct platform_device *pdev)
         return 0;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int mt6397_rtc_suspend(struct device *dev)
+{
+        struct mt6397_rtc *rtc = dev_get_drvdata(dev);
+
+        if (device_may_wakeup(dev))
+                enable_irq_wake(rtc->irq);
+
+        return 0;
+}
+
+static int mt6397_rtc_resume(struct device *dev)
+{
+        struct mt6397_rtc *rtc = dev_get_drvdata(dev);
+
+        if (device_may_wakeup(dev))
+                disable_irq_wake(rtc->irq);
+
+        return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(mt6397_pm_ops, mt6397_rtc_suspend,
+                        mt6397_rtc_resume);
+
 static const struct of_device_id mt6397_rtc_of_match[] = {
         { .compatible = "mediatek,mt6397-rtc", },
         { }
@@ -382,6 +407,7 @@ static struct platform_driver mtk_rtc_driver = {
         .driver = {
                 .name = "mt6397-rtc",
                 .of_match_table = mt6397_rtc_of_match,
+                .pm = &mt6397_pm_ops,
         },
         .probe  = mtk_rtc_probe,
         .remove = mtk_rtc_remove,