kernel/Documentation/rtc.txt, branch linux-rolling-stable

docs: admin-guide: add a series of orphaned documents

2019-07-15T14:03:02Z

There are lots of documents that belong to the admin-guide but are on random places (most under Documentation root dir). Move them to the admin guide. Signed-off-by: Mauro Carvalho Chehab Acked-by: Alexandre Belloni Acked-by: Bartlomiej Zolnierkiewicz

Documentation: rtc: Correct location of rtctest.c

2019-03-25T16:34:55Z

The useful little rtctest program moved location a while back. Fixes: a12ab9e125f1 ("selftests: move RTC tests to rtc subfolder") Signed-off-by: Joel Stanley Signed-off-by: Jonathan Corbet

Documentation: rtc: move iotcl interface documentation to ABI

2018-01-11T23:20:41Z

The ioctl interface should be in Documentation/ABI along with the rest of the interfaces. Signed-off-by: Aishwarya Pant Signed-off-by: Alexandre Belloni

Documentation: rtc: move sysfs documentation to ABI

2018-01-11T23:20:40Z

The sysfs documentation should be located under Documentation/ABI. Signed-off-by: Alexandre Belloni

rtc: add generic nvmem support

2017-07-07T11:14:14Z

Many RTCs have an on board non volatile storage. It can be battery backed RAM or an EEPROM. Use the nvmem subsystem to export it to both userspace and in-kernel consumers. This stays compatible with the previous (non documented) ABI that was using /sys/class/rtc/rtcx/device/nvram to export that memory. But will warn about the deprecation. Signed-off-by: Alexandre Belloni

rtc.txt: standardize document format

2017-05-31T11:15:28Z

Each text file under Documentation follows a different format. Some doesn't even have titles! Change its representation to follow the adopted standard, using ReST markups for it to be parseable by Sphinx: - adjust identation of the titles; - mark a table as such; - don't capitalize chapter names. Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Alexandre Belloni

rtc: implement a sysfs interface for clock offset

2016-03-14T16:08:16Z

clock offset may be set and read in decimal parts per billion attribute is /sys/class/rtc/rtcN/offset The attribute is only visible for rtcs that have set_offset implemented. Signed-off-by: Joshua Clayton Signed-off-by: Alexandre Belloni

Documentation, split up rtc.txt into documentation and test file

2015-03-25T04:01:58Z

This patch splits rtc.txt into two separate files, one for the documentation itself, and the other for the rtctest.c file. The rtctest file is moved into the kernel tools/testing/selftests/timers directory. This will make automated testing easier. Note that the only difference in the rtc.txt file is that the location of the rtctest.c file has changed. Signed-off-by: Prarit Bhargava Acked-by: Jonathan Corbet Acked-by: John Stultz Cc: corbet@lwn.net Cc: rtc-linux@googlegroups.com Cc: linux-doc@vger.kernel.org Cc: a.zummo@towertech.it Cc: prarit@redhat.com Cc: john.stultz@linaro.org Cc: shuahkh@osg.samsung.com Signed-off-by: Shuah Khan

rtc: add ability to push out an existing wakealarm using sysfs

2013-07-03T23:07:54Z

This adds the ability for the rtc sysfs code to handle += characters at the beginning of a wakealarm setting string. This will allow the user to attempt to push out an existing wakealarm by a provided amount. In the case that the += characters are provided but the alarm is not active -EINVAL is returned. his is useful, at least for my purposes in suspend/resume testing. The basic test goes something like: 1. Set a wake alarm from userspace 5 seconds in the future 2. Start the suspend process (echo mem > /sys/power/state) 3. After ~2.5 seconds if userspace is still running (using another thread to check this), move the wake alarm 5 more seconds If the "move" involves an unset of the wakealarm then there's a period of time where the system is midway through suspending but has no wake alarm. It will get stuck. We'd rather not remove the "move" since the idea is to avoid a cancelled suspend when the alarm fires _during_ suspend. It is difficult for the test to tell the difference between a suspend that was cancelled because the alarm fired too early and a suspend that was Signed-off-by: Bernie Thompson Cc: Alessandro Zummo Cc: Doug Anderson Cc: "Rafael J. Wysocki" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

rtc-proc: permit the /proc/driver/rtc device to use other devices

2012-10-05T18:05:01Z

To get time information via /proc/driver/rtc, only the first device (rtc0) is used. If the rtcN (eg. rtc1 or rtc2) is used for the system clock, there is no way to get information of rtcN via /proc/driver/rtc. With this patch, the time data can be retrieved from the system clock RTC. If the RTC_HCTOSYS_DEVICE is not defined, then rtc0 is used by default. Signed-off-by: Milo(Woogyom) Kim Cc: Alessandro Zummo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds