Documentation: rtc: move sysfs documentation to ABI

The sysfs documentation should be located under Documentation/ABI.

Signed-off-by: Alexandre Belloni <[email protected]>

Documentation/ABI/testing/sysfs-class-rtc

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+What:		/sys/class/rtc/
+Date:		March 2006
+KernelVersion:	2.6.17
+Contact:	[email protected]
+Description:
+		The rtc/ class subdirectory belongs to the RTC subsystem.
+
+What:		/sys/class/rtc/rtcX/
+Date:		March 2006
+KernelVersion:	2.6.17
+Contact:	[email protected]
+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:	[email protected]
+Description:
+		RTC-provided date in YYYY-MM-DD format
+
+What:		/sys/class/rtc/rtcX/hctosys
+Date:		September 2009
+KernelVersion:	2.6.32
+Contact:	[email protected]
+Description:
+		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:	[email protected]
+Description:
+		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:	[email protected]
+Description:
+		The name of the RTC corresponding to this sysfs directory
+
+What:		/sys/class/rtc/rtcX/since_epoch
+Date:		March 2006
+KernelVersion:	2.6.17
+Contact:	[email protected]
+Description:
+		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:	[email protected]
+Description:
+		RTC-provided time in 24-hour notation (hh:mm:ss)
+
+What:		/sys/class/rtc/rtcX/*/nvmem
+Date:		February 2016
+KernelVersion:	4.6
+Contact:	[email protected]
+Description:
+		The non volatile storage exported as a raw file, as described in
+		Documentation/nvmem/nvmem.txt
+
+What:		/sys/class/rtc/rtcX/offset
+Date:		February 2016
+KernelVersion:	4.6
+Contact:	[email protected]
+Description:
+		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:	[email protected]
+Description:
+		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.