The rv3028 chip is kind of strange. The chip has two inputs one for the buffer battery (V_backup) and one for the main power supply (V_dd). By default a clk out of the chip is enabled, drawing a big amount of current, draining the buffer battery of our board in 3 days. There is a mode that would shut down the clk out if powered from V_backup, but that would have to be configured as well. In our application the battery is connected via V_dd. So disabling the clk by default is the way to go for us. Signed-off-by: Johannes Kirchmair <johannes.kirchmair@xxxxxxxxxxx> --- drivers/rtc/rtc-rv3028.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/rtc/rtc-rv3028.c b/drivers/rtc/rtc-rv3028.c index 12c807306893..9e2aaa7a533e 100644 --- a/drivers/rtc/rtc-rv3028.c +++ b/drivers/rtc/rtc-rv3028.c @@ -787,7 +787,7 @@ static const struct regmap_config regmap_config = { static int rv3028_probe(struct i2c_client *client) { struct rv3028_data *rv3028; - int ret, status; + int ret, status, buf; u32 ohms; struct nvmem_config nvmem_cfg = { .name = "rv3028_nvram", @@ -826,6 +826,16 @@ static int rv3028_probe(struct i2c_client *client) if (status & RV3028_STATUS_AF) dev_warn(&client->dev, "An alarm may have been missed.\n"); + ret = regmap_read(rv3028->regmap, RV3028_CLKOUT, &buf); + if (ret < 0) + return ret; + + if (buf != RV3028_CLKOUT_FD_MASK) { + ret = rv3028_update_cfg(rv3028, RV3028_CLKOUT, 0xff, RV3028_CLKOUT_FD_MASK); // disable clk out + if (ret < 0) + return ret; + } + rv3028->rtc = devm_rtc_allocate_device(&client->dev); if (IS_ERR(rv3028->rtc)) return PTR_ERR(rv3028->rtc); -- 2.25.1