What: /sys/class/rtc/
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Date: March 2006
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KernelVersion: 2.6.17
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Contact: linux-rtc@vger.kernel.org
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Description:
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The rtc/ class subdirectory belongs to the RTC subsystem.
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What: /sys/class/rtc/rtcX/
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Date: March 2006
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KernelVersion: 2.6.17
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Contact: linux-rtc@vger.kernel.org
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Description:
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The /sys/class/rtc/rtc{0,1,2,3,...} directories correspond
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to each RTC device.
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What: /sys/class/rtc/rtcX/date
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Date: March 2006
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KernelVersion: 2.6.17
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Contact: linux-rtc@vger.kernel.org
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Description:
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(RO) RTC-provided date in YYYY-MM-DD format
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What: /sys/class/rtc/rtcX/hctosys
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Date: September 2009
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KernelVersion: 2.6.32
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Contact: linux-rtc@vger.kernel.org
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Description:
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(RO) 1 if the RTC provided the system time at boot via the
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CONFIG_RTC_HCTOSYS kernel option, 0 otherwise
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What: /sys/class/rtc/rtcX/max_user_freq
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Date: October 2007
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KernelVersion: 2.6.24
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Contact: linux-rtc@vger.kernel.org
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Description:
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(RW) The maximum interrupt rate an unprivileged user may request
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from this RTC.
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What: /sys/class/rtc/rtcX/name
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Date: March 2006
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KernelVersion: 2.6.17
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Contact: linux-rtc@vger.kernel.org
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Description:
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(RO) The name of the RTC corresponding to this sysfs directory
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What: /sys/class/rtc/rtcX/range
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Date: January 2018
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KernelVersion: 4.16
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Contact: linux-rtc@vger.kernel.org
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Description:
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Valid time range for the RTC, as seconds from epoch, formatted
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as [min, max]
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What: /sys/class/rtc/rtcX/since_epoch
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Date: March 2006
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KernelVersion: 2.6.17
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Contact: linux-rtc@vger.kernel.org
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Description:
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(RO) RTC-provided time as the number of seconds since the epoch
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What: /sys/class/rtc/rtcX/time
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Date: March 2006
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KernelVersion: 2.6.17
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Contact: linux-rtc@vger.kernel.org
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Description:
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(RO) RTC-provided time in 24-hour notation (hh:mm:ss)
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What: /sys/class/rtc/rtcX/offset
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Date: February 2016
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KernelVersion: 4.6
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Contact: linux-rtc@vger.kernel.org
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Description:
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(RW) The amount which the rtc clock has been adjusted in
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firmware. Visible only if the driver supports clock offset
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adjustment. The unit is parts per billion, i.e. The number of
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clock ticks which are added to or removed from the rtc's base
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clock per billion ticks. A positive value makes a day pass more
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slowly, longer, and a negative value makes a day pass more
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quickly.
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What: /sys/class/rtc/rtcX/wakealarm
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Date: February 2007
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KernelVersion: 2.6.20
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Contact: linux-rtc@vger.kernel.org
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Description:
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(RW) The time at which the clock will generate a system wakeup
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event. This is a one shot wakeup event, so must be reset after
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wake if a daily wakeup is required. Format is seconds since the
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epoch by default, or if there's a leading +, seconds in the
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future, or if there is a leading +=, seconds ahead of the
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current alarm.
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