rtc: rv8803: Add power management support

Add power management support to the driver. This allows a SoC to wake
from suspend using the nINT provided by the RTC. Only register it as a
wakeup device if the interrupt is provided and handled.

Signed-off-by: Stefan Eichenberger <eichest@gmail.com>
Link: https://lore.kernel.org/r/20231122181611.164792-1-eichest@gmail.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

diff --git a/drivers/rtc/rtc-rv8803.c b/drivers/rtc/rtc-rv8803.c
index 1a3ec1bb5b8148dd945ad127f45e657cd4c5a882..11e6b0d31f5d72a490741495340ac24ae4c3c4f8 100644 (file)
--- a/drivers/rtc/rtc-rv8803.c
+++ b/drivers/rtc/rtc-rv8803.c
@@ -17,6 +17,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/rtc.h>
+#include <linux/pm_wakeirq.h>
 
 #define RV8803_I2C_TRY_COUNT           4
 
@@ -607,6 +608,28 @@ static int rv8803_regs_configure(struct rv8803_data *rv8803)
        return 0;
 }
 
+static int rv8803_resume(struct device *dev)
+{
+       struct rv8803_data *rv8803 = dev_get_drvdata(dev);
+
+       if (rv8803->client->irq > 0 && device_may_wakeup(dev))
+               disable_irq_wake(rv8803->client->irq);
+
+       return 0;
+}
+
+static int rv8803_suspend(struct device *dev)
+{
+       struct rv8803_data *rv8803 = dev_get_drvdata(dev);
+
+       if (rv8803->client->irq > 0 && device_may_wakeup(dev))
+               enable_irq_wake(rv8803->client->irq);
+
+       return 0;
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(rv8803_pm_ops, rv8803_suspend, rv8803_resume);
+
 static const struct i2c_device_id rv8803_id[] = {
        { "rv8803", rv_8803 },
        { "rv8804", rx_8804 },
@@ -683,6 +706,11 @@ static int rv8803_probe(struct i2c_client *client)
                if (err) {
                        dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");
                        client->irq = 0;
+               } else {
+                       device_init_wakeup(&client->dev, true);
+                       err = dev_pm_set_wake_irq(&client->dev, client->irq);
+                       if (err)
+                               dev_err(&client->dev, "failed to set wake IRQ\n");
                }
        }
        if (!client->irq)
@@ -737,6 +765,7 @@ static struct i2c_driver rv8803_driver = {
        .driver = {
                .name = "rtc-rv8803",
                .of_match_table = of_match_ptr(rv8803_of_match),
+               .pm = &rv8803_pm_ops,
        },
        .probe          = rv8803_probe,
        .id_table       = rv8803_id,