linux-kernel - [PATCH] rtc: pcf8523: add suspend handlers for alarm IRQ

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Message-ID: <20240227211833.1820800-1-alexandre.belloni@bootlin.com>
Date: Tue, 27 Feb 2024 22:18:32 +0100
From: alexandre.belloni@...tlin.com
To: Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc: linux-rtc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] rtc: pcf8523: add suspend handlers for alarm IRQ

From: Alexandre Belloni <alexandre.belloni@...tlin.com>

Ensure the RTC is able to wake up the system from suspend.

Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
---
 drivers/rtc/rtc-pcf8523.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/rtc/rtc-pcf8523.c b/drivers/rtc/rtc-pcf8523.c
index d1efde3e7a80..98b77f790b0c 100644
--- a/drivers/rtc/rtc-pcf8523.c
+++ b/drivers/rtc/rtc-pcf8523.c
@@ -370,6 +370,30 @@ static int pcf8523_rtc_set_offset(struct device *dev, long offset)
 	return regmap_write(pcf8523->regmap, PCF8523_REG_OFFSET, value);
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int pcf8523_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+
+	if (client->irq > 0 && device_may_wakeup(dev))
+		enable_irq_wake(client->irq);
+
+	return 0;
+}
+
+static int pcf8523_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+
+	if (client->irq > 0 && device_may_wakeup(dev))
+		disable_irq_wake(client->irq);
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(pcf8523_pm, pcf8523_suspend, pcf8523_resume);
+
 static const struct rtc_class_ops pcf8523_rtc_ops = {
 	.read_time = pcf8523_rtc_read_time,
 	.set_time = pcf8523_rtc_set_time,
@@ -487,6 +511,7 @@ static struct i2c_driver pcf8523_driver = {
 	.driver = {
 		.name = "rtc-pcf8523",
 		.of_match_table = pcf8523_of_match,
+		.pm = &pcf8523_pm,
 	},
 	.probe = pcf8523_probe,
 	.id_table = pcf8523_id,
-- 
2.43.0