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1What: /sys/class/rtc/2Date: March 20063KernelVersion: 2.6.174Contact: linux-rtc@vger.kernel.org5Description:6 The rtc/ class subdirectory belongs to the RTC subsystem.7 8What: /sys/class/rtc/rtcX/9Date: March 200610KernelVersion: 2.6.1711Contact: linux-rtc@vger.kernel.org12Description:13 The /sys/class/rtc/rtc{0,1,2,3,...} directories correspond14 to each RTC device.15 16What: /sys/class/rtc/rtcX/date17Date: March 200618KernelVersion: 2.6.1719Contact: linux-rtc@vger.kernel.org20Description:21 (RO) RTC-provided date in YYYY-MM-DD format22 23What: /sys/class/rtc/rtcX/hctosys24Date: September 200925KernelVersion: 2.6.3226Contact: linux-rtc@vger.kernel.org27Description:28 (RO) 1 if the RTC provided the system time at boot via the29 CONFIG_RTC_HCTOSYS kernel option, 0 otherwise30 31What: /sys/class/rtc/rtcX/max_user_freq32Date: October 200733KernelVersion: 2.6.2434Contact: linux-rtc@vger.kernel.org35Description:36 (RW) The maximum interrupt rate an unprivileged user may request37 from this RTC.38 39What: /sys/class/rtc/rtcX/name40Date: March 200641KernelVersion: 2.6.1742Contact: linux-rtc@vger.kernel.org43Description:44 (RO) The name of the RTC corresponding to this sysfs directory45 46What: /sys/class/rtc/rtcX/range47Date: January 201848KernelVersion: 4.1649Contact: linux-rtc@vger.kernel.org50Description:51 Valid time range for the RTC, as seconds from epoch, formatted52 as [min, max]53 54What: /sys/class/rtc/rtcX/since_epoch55Date: March 200656KernelVersion: 2.6.1757Contact: linux-rtc@vger.kernel.org58Description:59 (RO) RTC-provided time as the number of seconds since the epoch60 61What: /sys/class/rtc/rtcX/time62Date: March 200663KernelVersion: 2.6.1764Contact: linux-rtc@vger.kernel.org65Description:66 (RO) RTC-provided time in 24-hour notation (hh:mm:ss)67 68What: /sys/class/rtc/rtcX/offset69Date: February 201670KernelVersion: 4.671Contact: linux-rtc@vger.kernel.org72Description:73 (RW) The amount which the rtc clock has been adjusted in74 firmware. Visible only if the driver supports clock offset75 adjustment. The unit is parts per billion, i.e. The number of76 clock ticks which are added to or removed from the rtc's base77 clock per billion ticks. A positive value makes a day pass more78 slowly, longer, and a negative value makes a day pass more79 quickly.80 81What: /sys/class/rtc/rtcX/wakealarm82Date: February 200783KernelVersion: 2.6.2084Contact: linux-rtc@vger.kernel.org85Description:86 (RW) The time at which the clock will generate a system wakeup87 event. This is a one shot wakeup event, so must be reset after88 wake if a daily wakeup is required. Format is seconds since the89 epoch by default, or if there's a leading +, seconds in the90 future, or if there is a leading +=, seconds ahead of the91 current alarm.92