From 2268551935dbf1abcbb4d4fb7b1ad74dbe0d1be0 Mon Sep 17 00:00:00 2001 From: Alexandre Belloni Date: Mon, 18 Oct 2021 17:19:29 +0200 Subject: [PATCH] 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 Link: https://lore.kernel.org/r/20211018151933.76865-4-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 dbccd71..2e0cbc1 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 3241f9e..c83bb9a 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 -- 2.7.4