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@xxxxxxxxxxx>
---
drivers/rtc/class.c | 3 +++
include/uapi/linux/rtc.h | 3 ++-
2 files changed, 5 insertions(+), 1 deletion(-)
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 e4128be7963b..ded2aaab7ec7 100644
--- a/include/uapi/linux/rtc.h
+++ b/include/uapi/linux/rtc.h
@@ -131,7 +131,8 @@ struct rtc_param {
#define RTC_FEATURE_ALARM_RES_2S 2
#define RTC_FEATURE_UPDATE_INTERRUPT 3
#define RTC_FEATURE_NEED_WEEK_DAY 4
-#define RTC_FEATURE_CNT 5
+#define RTC_FEATURE_CORRECTION 5
+#define RTC_FEATURE_CNT 6
/* parameter list */
#define RTC_PARAM_FEATURES 0
--
2.31.1
