[PATCH 2/2] rtc: pcf85063: handle stopped oscillator at startup

[Ciprian Costea]

From: Ciprian Marian Costea <ciprianmarian.costea@xxxxxxxxxxx>

If the RTC is not linked to any battery, the oscillator is stopped at
startup and a SW reset command is generated to the PCF85063 RTC.
Manually start the oscillator in case the PCF85063 RTC is not battery
backed.

Co-developed-by: Larisa Grigore <larisa.grigore@xxxxxxx>
Signed-off-by: Larisa Grigore <larisa.grigore@xxxxxxx>
Signed-off-by: Ciprian Marian Costea <ciprianmarian.costea@xxxxxxxxxxx>
---
 drivers/rtc/rtc-pcf85063.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/rtc/rtc-pcf85063.c b/drivers/rtc/rtc-pcf85063.c
index 4fa5c4ecdd5a..6de7344d2469 100644
--- a/drivers/rtc/rtc-pcf85063.c
+++ b/drivers/rtc/rtc-pcf85063.c
@@ -590,6 +590,14 @@ static int pcf85063_probe(struct i2c_client *client)
 
 	i2c_set_clientdata(client, pcf85063);
 
+	if (of_property_read_bool(client->dev.of_node, "no-battery")) {
+		err = regmap_update_bits(pcf85063->regmap, PCF85063_REG_SC,
+					 PCF85063_REG_SC_OS, 0);
+		if (err)
+			return dev_err_probe(&client->dev, err,
+					"Failed to start the oscillator\n");
+	}
+
 	err = regmap_read(pcf85063->regmap, PCF85063_REG_SC, &tmp);
 	if (err)
 		return dev_err_probe(&client->dev, err, "RTC chip is not present\n");
-- 
2.45.2