summaryrefslogtreecommitdiffstats
path: root/Documentation/ABI/testing/sysfs-class-rtc
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /Documentation/ABI/testing/sysfs-class-rtc
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'Documentation/ABI/testing/sysfs-class-rtc')
-rw-r--r--Documentation/ABI/testing/sysfs-class-rtc91
1 files changed, 91 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-rtc b/Documentation/ABI/testing/sysfs-class-rtc
new file mode 100644
index 000000000..95984289a
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-rtc
@@ -0,0 +1,91 @@
+What: /sys/class/rtc/
+Date: March 2006
+KernelVersion: 2.6.17
+Contact: linux-rtc@vger.kernel.org
+Description:
+ The rtc/ class subdirectory belongs to the RTC subsystem.
+
+What: /sys/class/rtc/rtcX/
+Date: March 2006
+KernelVersion: 2.6.17
+Contact: linux-rtc@vger.kernel.org
+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: linux-rtc@vger.kernel.org
+Description:
+ (RO) RTC-provided date in YYYY-MM-DD format
+
+What: /sys/class/rtc/rtcX/hctosys
+Date: September 2009
+KernelVersion: 2.6.32
+Contact: linux-rtc@vger.kernel.org
+Description:
+ (RO) 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: linux-rtc@vger.kernel.org
+Description:
+ (RW) 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: linux-rtc@vger.kernel.org
+Description:
+ (RO) The name of the RTC corresponding to this sysfs directory
+
+What: /sys/class/rtc/rtcX/range
+Date: January 2018
+KernelVersion: 4.16
+Contact: linux-rtc@vger.kernel.org
+Description:
+ Valid time range for the RTC, as seconds from epoch, formatted
+ as [min, max]
+
+What: /sys/class/rtc/rtcX/since_epoch
+Date: March 2006
+KernelVersion: 2.6.17
+Contact: linux-rtc@vger.kernel.org
+Description:
+ (RO) 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: linux-rtc@vger.kernel.org
+Description:
+ (RO) RTC-provided time in 24-hour notation (hh:mm:ss)
+
+What: /sys/class/rtc/rtcX/offset
+Date: February 2016
+KernelVersion: 4.6
+Contact: linux-rtc@vger.kernel.org
+Description:
+ (RW) 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: linux-rtc@vger.kernel.org
+Description:
+ (RW) 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.