[PATCH 3/7] rtc: expose correction feature
From: Alexandre Belloni <alexandre.belloni@bootlin.com>
Date: 2021-10-15 19:26:54
Also in:
lkml
Subsystem:
real time clock (rtc) subsystem, the rest · Maintainers:
Alexandre Belloni, Linus Torvalds
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> --- 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