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1 What:           /sys/class/rtc/
2 Date:           March 2006
3 KernelVersion:  2.6.17
4 Contact:        [email protected]
5 Description:
6                 The rtc/ class subdirectory belongs to the RTC subsystem.
7
8 What:           /sys/class/rtc/rtcX/
9 Date:           March 2006
10 KernelVersion:  2.6.17
11 Contact:        [email protected]
12 Description:
13                 The /sys/class/rtc/rtc{0,1,2,3,...} directories correspond
14                 to each RTC device.
15
16 What:           /sys/class/rtc/rtcX/date
17 Date:           March 2006
18 KernelVersion:  2.6.17
19 Contact:        [email protected]
20 Description:
21                 (RO) RTC-provided date in YYYY-MM-DD format
22
23 What:           /sys/class/rtc/rtcX/hctosys
24 Date:           September 2009
25 KernelVersion:  2.6.32
26 Contact:        [email protected]
27 Description:
28                 (RO) 1 if the RTC provided the system time at boot via the
29                 CONFIG_RTC_HCTOSYS kernel option, 0 otherwise
30
31 What:           /sys/class/rtc/rtcX/max_user_freq
32 Date:           October 2007
33 KernelVersion:  2.6.24
34 Contact:        [email protected]
35 Description:
36                 (RW) The maximum interrupt rate an unprivileged user may request
37                 from this RTC.
38
39 What:           /sys/class/rtc/rtcX/name
40 Date:           March 2006
41 KernelVersion:  2.6.17
42 Contact:        [email protected]
43 Description:
44                 (RO) The name of the RTC corresponding to this sysfs directory
45
46 What:           /sys/class/rtc/rtcX/range
47 Date:           January 2018
48 KernelVersion:  4.16
49 Contact:        [email protected]
50 Description:
51                 Valid time range for the RTC, as seconds from epoch, formatted
52                 as [min, max]
53
54 What:           /sys/class/rtc/rtcX/since_epoch
55 Date:           March 2006
56 KernelVersion:  2.6.17
57 Contact:        [email protected]
58 Description:
59                 (RO) RTC-provided time as the number of seconds since the epoch
60
61 What:           /sys/class/rtc/rtcX/time
62 Date:           March 2006
63 KernelVersion:  2.6.17
64 Contact:        [email protected]
65 Description:
66                 (RO) RTC-provided time in 24-hour notation (hh:mm:ss)
67
68 What:           /sys/class/rtc/rtcX/offset
69 Date:           February 2016
70 KernelVersion:  4.6
71 Contact:        [email protected]
72 Description:
73                 (RW) The amount which the rtc clock has been adjusted in
74                 firmware. Visible only if the driver supports clock offset
75                 adjustment. The unit is parts per billion, i.e. The number of
76                 clock ticks which are added to or removed from the rtc's base
77                 clock per billion ticks. A positive value makes a day pass more
78                 slowly, longer, and a negative value makes a day pass more
79                 quickly.
80
81 What:           /sys/class/rtc/rtcX/wakealarm
82 Date:           February 2007
83 KernelVersion:  2.6.20
84 Contact:        [email protected]
85 Description:
86                 (RW) The time at which the clock will generate a system wakeup
87                 event. This is a one shot wakeup event, so must be reset after
88                 wake if a daily wakeup is required. Format is seconds since the
89                 epoch by default, or if there's a leading +, seconds in the
90                 future, or if there is a leading +=, seconds ahead of the
91                 current alarm.
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