unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
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rtc: expose correction feature

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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
This commit is contained in:
Alexandre Belloni 2021-10-18 17:19:29 +02:00
parent 6a8af1b656
commit 2268551935
2 changed files with 5 additions and 1 deletions
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3
drivers/rtc/class.c
View file

@ -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);

3
include/uapi/linux/rtc.h
View file

@ -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