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| author | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2021-10-18 17:19:29 +0200 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2021-10-18 17:20:50 +0200 |
| commit | 2268551935dbf1abcbb4d4fb7b1ad74dbe0d1be0 (patch) | |
| tree | f387d01196b4cf597ffd89c930725a4c46bd652d | |
| parent | 6a8af1b6568ad9ee08a419fb12c793f7992cf8a4 (diff) | |
| download | lwn-2268551935dbf1abcbb4d4fb7b1ad74dbe0d1be0.tar.gz lwn-2268551935dbf1abcbb4d4fb7b1ad74dbe0d1be0.zip | |
rtc: expose correction feature
Add a new feature for RTCs able to correct the oscillator imprecision. This
is also called offset or trimming. Such drivers have a .set_offset callback,
use that to set the feature bit from the core.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20211018151933.76865-4-alexandre.belloni@bootlin.com
| -rw-r--r-- | drivers/rtc/class.c | 3 | ||||
| -rw-r--r-- | include/uapi/linux/rtc.h | 3 |
2 files changed, 5 insertions, 1 deletions
diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c index dbccd71589b9..2e0cbc190a8a 100644 --- a/drivers/rtc/class.c +++ b/drivers/rtc/class.c @@ -389,6 +389,9 @@ int __devm_rtc_register_device(struct module *owner, struct rtc_device *rtc) if (!rtc->ops->set_alarm) clear_bit(RTC_FEATURE_ALARM, rtc->features); + if (rtc->ops->set_offset) + set_bit(RTC_FEATURE_CORRECTION, rtc->features); + rtc->owner = owner; rtc_device_get_offset(rtc); diff --git a/include/uapi/linux/rtc.h b/include/uapi/linux/rtc.h index 3241f9ecc639..c83bb9a4fa4f 100644 --- a/include/uapi/linux/rtc.h +++ b/include/uapi/linux/rtc.h @@ -131,7 +131,8 @@ struct rtc_param { #define RTC_FEATURE_NEED_WEEK_DAY 2 #define RTC_FEATURE_ALARM_RES_2S 3 #define RTC_FEATURE_UPDATE_INTERRUPT 4 -#define RTC_FEATURE_CNT 5 +#define RTC_FEATURE_CORRECTION 5 +#define RTC_FEATURE_CNT 6 /* parameter list */ #define RTC_PARAM_FEATURES 0 |