serial: imx: simplify some conditions related to dma
[linux/fpc-iii.git] / Documentation / ABI / testing / sysfs-class-rtc
blobcf60412882f0ded5c3cdc577f18cb36b05b1866b
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.
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.
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
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
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.
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
46 What:           /sys/class/rtc/rtcX/since_epoch
47 Date:           March 2006
48 KernelVersion:  2.6.17
49 Contact:        linux-rtc@vger.kernel.org
50 Description:
51                 (RO) RTC-provided time as the number of seconds since the epoch
53 What:           /sys/class/rtc/rtcX/time
54 Date:           March 2006
55 KernelVersion:  2.6.17
56 Contact:        linux-rtc@vger.kernel.org
57 Description:
58                 (RO) RTC-provided time in 24-hour notation (hh:mm:ss)
60 What:           /sys/class/rtc/rtcX/*/nvmem
61 Date:           February 2016
62 KernelVersion:  4.6
63 Contact:        linux-rtc@vger.kernel.org
64 Description:
65                 (RW) The non volatile storage exported as a raw file, as
66                 described in Documentation/nvmem/nvmem.txt
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.
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.