diff options
Diffstat (limited to 'drivers/rtc/rtc-pcf85063.c')
| -rw-r--r-- | drivers/rtc/rtc-pcf85063.c | 25 |
1 files changed, 20 insertions, 5 deletions
diff --git a/drivers/rtc/rtc-pcf85063.c b/drivers/rtc/rtc-pcf85063.c index 905986c61655..4fa5c4ecdd5a 100644 --- a/drivers/rtc/rtc-pcf85063.c +++ b/drivers/rtc/rtc-pcf85063.c @@ -35,6 +35,7 @@ #define PCF85063_REG_CTRL1_CAP_SEL BIT(0) #define PCF85063_REG_CTRL1_STOP BIT(5) #define PCF85063_REG_CTRL1_EXT_TEST BIT(7) +#define PCF85063_REG_CTRL1_SWR 0x58 #define PCF85063_REG_CTRL2 0x01 #define PCF85063_CTRL2_AF BIT(6) @@ -589,16 +590,30 @@ static int pcf85063_probe(struct i2c_client *client) i2c_set_clientdata(client, pcf85063); - err = regmap_read(pcf85063->regmap, PCF85063_REG_CTRL1, &tmp); - if (err) { - dev_err(&client->dev, "RTC chip is not present\n"); - return err; - } + err = regmap_read(pcf85063->regmap, PCF85063_REG_SC, &tmp); + if (err) + return dev_err_probe(&client->dev, err, "RTC chip is not present\n"); pcf85063->rtc = devm_rtc_allocate_device(&client->dev); if (IS_ERR(pcf85063->rtc)) return PTR_ERR(pcf85063->rtc); + /* + * If a Power loss is detected, SW reset the device. + * From PCF85063A datasheet: + * There is a low probability that some devices will have corruption + * of the registers after the automatic power-on reset... + */ + if (tmp & PCF85063_REG_SC_OS) { + dev_warn(&client->dev, + "POR issue detected, sending a SW reset\n"); + err = regmap_write(pcf85063->regmap, PCF85063_REG_CTRL1, + PCF85063_REG_CTRL1_SWR); + if (err < 0) + dev_warn(&client->dev, + "SW reset failed, trying to continue\n"); + } + err = pcf85063_load_capacitance(pcf85063, client->dev.of_node, config->force_cap_7000 ? 7000 : 0); if (err < 0) |