diff options
Diffstat (limited to 'drivers/rtc/rtc-pcf8523.c')
| -rw-r--r-- | drivers/rtc/rtc-pcf8523.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-pcf8523.c b/drivers/rtc/rtc-pcf8523.c index c93acade7205..83e92e8206e4 100644 --- a/drivers/rtc/rtc-pcf8523.c +++ b/drivers/rtc/rtc-pcf8523.c @@ -379,6 +379,16 @@ static int pcf8523_rtc_set_offset(struct device *dev, long offset) return regmap_write(pcf8523->regmap, PCF8523_REG_OFFSET, value); } +static void pcf8523_rtc_pre_register(struct rtc_device *rtc) +{ + /* + * "The first increment of the time circuits is between 0.499878s + * and 0.5s after STOP is released. Measurement on iMX6 show that + * -485ms gives a time set within +/- 5ms. + */ + rtc->set_offset_nsec = -495 * NSEC_PER_MSEC; +} + static const struct rtc_class_ops pcf8523_rtc_ops = { .read_time = pcf8523_rtc_read_time, .set_time = pcf8523_rtc_set_time, @@ -390,6 +400,7 @@ static const struct rtc_class_ops pcf8523_rtc_ops = { .set_offset = pcf8523_rtc_set_offset, .param_get = pcf8523_param_get, .param_set = pcf8523_param_set, + .pre_register = pcf8523_rtc_pre_register, }; static const struct regmap_config regmap_config = { |