1 What: /sys/class/rtc/
2 Date: March 2006
3 KernelVersion: 2.6.17
4 Contact: linux-rtc@vger.kernel.org
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: linux-rtc@vger.kernel.org
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: linux-rtc@vger.kernel.org
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: linux-rtc@vger.kernel.org
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: linux-rtc@vger.kernel.org
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: linux-rtc@vger.kernel.org
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: linux-rtc@vger.kernel.org
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: linux-rtc@vger.kernel.org
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: linux-rtc@vger.kernel.org
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: linux-rtc@vger.kernel.org
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: linux-rtc@vger.kernel.org
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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