[02/17] rtc: Document RTC_VL_READ and RTC_VL_CLR ioctls
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Message ID 20191214220259.621996-3-alexandre.belloni@bootlin.com
State Accepted
Headers show
  • rtc: Unify RTC_VL_READ meaning
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Commit Message

Alexandre Belloni Dec. 14, 2019, 10:02 p.m. UTC
RTC_VL_READ and RTC_VL_CLR have been introduced in 2012 with commit
0f20b767e20a ("drivers/rtc/rtc-pcf8563.c: add RTC_VL_READ/RTC_VL_CLR ioctl

Document them now that they have been unified.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
 Documentation/ABI/testing/rtc-cdev | 8 ++++++++
 1 file changed, 8 insertions(+)

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diff --git a/Documentation/ABI/testing/rtc-cdev b/Documentation/ABI/testing/rtc-cdev
index 97447283f13b..25910c3c3d7e 100644
--- a/Documentation/ABI/testing/rtc-cdev
+++ b/Documentation/ABI/testing/rtc-cdev
@@ -33,6 +33,14 @@  Description:
 		  Requires a separate RTC_PIE_ON call to enable the periodic
+		* RTC_VL_READ: Read the voltage inputs status of the RTC when
+		  supported. The value is a bit field of RTC_VL_*, giving the
+		  status of the main and backup voltages.
+		* RTC_VL_CLEAR: Clear the voltage status of the RTC. Some RTCs
+		  need user interaction when the backup power provider is
+		  replaced or charged to be able to clear the status.
 		The ioctl() calls supported by the older /dev/rtc interface are
 		also supported by the newer RTC class framework. However,
 		because the chips and systems are not standardized, some PC/AT