The battery backup can be disabled on this RTC, e.g. if populated right
out of production. Force the battery backup bit on to enable it.
Signed-off-by: Marek Vasut <marex@xxxxxxx>
Cc: Arnaud Ebalard <arno@xxxxxxxxxxxx>
Cc: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx>
Cc: Bastian Krause <bst@xxxxxxxxxxxxxx>
---
V2: Drop the custom offset, let regmap handle that
---
drivers/rtc/rtc-ds1307.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index 1f7e8aefc1eb..f2d1e59478c2 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -121,6 +121,8 @@ enum ds_type {
#define RX8130_REG_FLAG_AF BIT(3)
#define RX8130_REG_CONTROL0 0x1e
#define RX8130_REG_CONTROL0_AIE BIT(3)
+#define RX8130_REG_CONTROL1 0x1f
+#define RX8130_REG_CONTROL1_INIEN BIT(4)
#define MCP794XX_REG_CONTROL 0x07
# define MCP794XX_BIT_ALM0_EN 0x10
@@ -1750,6 +1752,11 @@ static int ds1307_probe(struct i2c_client *client,
DS1307_REG_HOUR << 4 | 0x08, hour);
}
break;
+ case rx_8130:
+ /* make sure that the backup battery is enabled */
+ regmap_write(ds1307->regmap, RX8130_REG_CONTROL1,
+ RX8130_REG_CONTROL1_INIEN);
+ break;
default:
break;
}
--
2.23.0.rc1
