diff options
Diffstat (limited to 'drivers/rtc/rtc-pcf85063.c')
| -rw-r--r-- | drivers/rtc/rtc-pcf85063.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/drivers/rtc/rtc-pcf85063.c b/drivers/rtc/rtc-pcf85063.c index 6ffdc10b32d3..b095663d5ebc 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) @@ -409,7 +410,7 @@ static long pcf85063_clkout_round_rate(struct clk_hw *hw, unsigned long rate, if (clkout_rates[i] <= rate) return clkout_rates[i]; - return 0; + return clkout_rates[0]; } static int pcf85063_clkout_set_rate(struct clk_hw *hw, unsigned long rate, @@ -606,7 +607,7 @@ static int pcf85063_probe(struct i2c_client *client) i2c_set_clientdata(client, pcf85063); - err = regmap_read(pcf85063->regmap, PCF85063_REG_CTRL1, &tmp); + err = regmap_read(pcf85063->regmap, PCF85063_REG_SC, &tmp); if (err) { dev_err(&client->dev, "RTC chip is not present\n"); return err; @@ -616,6 +617,22 @@ static int pcf85063_probe(struct i2c_client *client) 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) |