| 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/range |
| Date: January 2018 |
| KernelVersion: 4.16 |
| Contact: linux-rtc@vger.kernel.org |
| Description: |
| Valid time range for the RTC, as seconds from epoch, formatted |
| as [min, max] |
| |
| 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/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. |