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- What: /sys/class/rtc/
- Date: March 2006
- KernelVersion: 2.6.17
- Contact: linux-rtc@vger.kernel.org
- Description:
- The rtc/ class subdirectory belongs to the RTC subsystem.
- What: /sys/class/rtc/rtcX/
- Date: March 2006
- KernelVersion: 2.6.17
- Contact: linux-rtc@vger.kernel.org
- Description:
- The /sys/class/rtc/rtc{0,1,2,3,...} directories correspond
- to each RTC device.
- What: /sys/class/rtc/rtcX/date
- Date: March 2006
- KernelVersion: 2.6.17
- Contact: linux-rtc@vger.kernel.org
- Description:
- (RO) RTC-provided date in YYYY-MM-DD format
- What: /sys/class/rtc/rtcX/hctosys
- Date: September 2009
- KernelVersion: 2.6.32
- Contact: linux-rtc@vger.kernel.org
- Description:
- (RO) 1 if the RTC provided the system time at boot via the
- CONFIG_RTC_HCTOSYS kernel option, 0 otherwise
- What: /sys/class/rtc/rtcX/max_user_freq
- Date: October 2007
- KernelVersion: 2.6.24
- Contact: linux-rtc@vger.kernel.org
- Description:
- (RW) The maximum interrupt rate an unprivileged user may request
- from this RTC.
- What: /sys/class/rtc/rtcX/name
- Date: March 2006
- KernelVersion: 2.6.17
- Contact: linux-rtc@vger.kernel.org
- Description:
- (RO) The name of the RTC corresponding to this sysfs directory
- What: /sys/class/rtc/rtcX/since_epoch
- Date: March 2006
- KernelVersion: 2.6.17
- Contact: linux-rtc@vger.kernel.org
- Description:
- (RO) RTC-provided time as the number of seconds since the epoch
- What: /sys/class/rtc/rtcX/time
- Date: March 2006
- KernelVersion: 2.6.17
- Contact: linux-rtc@vger.kernel.org
- Description:
- (RO) RTC-provided time in 24-hour notation (hh:mm:ss)
- What: /sys/class/rtc/rtcX/*/nvmem
- Date: February 2016
- KernelVersion: 4.6
- Contact: linux-rtc@vger.kernel.org
- Description:
- (RW) The non volatile storage exported as a raw file, as
- described in Documentation/nvmem/nvmem.txt
- What: /sys/class/rtc/rtcX/offset
- Date: February 2016
- KernelVersion: 4.6
- Contact: linux-rtc@vger.kernel.org
- Description:
- (RW) The amount which the rtc clock has been adjusted in
- firmware. Visible only if the driver supports clock offset
- adjustment. The unit is parts per billion, i.e. The number of
- clock ticks which are added to or removed from the rtc's base
- clock per billion ticks. A positive value makes a day pass more
- slowly, longer, and a negative value makes a day pass more
- quickly.
- What: /sys/class/rtc/rtcX/wakealarm
- Date: February 2007
- KernelVersion: 2.6.20
- Contact: linux-rtc@vger.kernel.org
- Description:
- (RW) The time at which the clock will generate a system wakeup
- event. This is a one shot wakeup event, so must be reset after
- wake if a daily wakeup is required. Format is seconds since the
- epoch by default, or if there's a leading +, seconds in the
- future, or if there is a leading +=, seconds ahead of the
- current alarm.
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