Some RTC devices have a battery-low automatic detection circuit.
The battery-low event is usually reported with:
- a bit change in a RTC status register
- a hw signaling (generally using an interrupt generation), changing
the hw level of a specific pin;
The new property "battery-low-hw-alarm" enable the RTC to generate the
hw signaling in case of battery-low event.
Signed-off-by: Flavio Suligoi <f.suligoi@xxxxxxx>
---
Documentation/devicetree/bindings/rtc/rtc.txt | 3 +++
1 file changed, 3 insertions(+)
diff --git a/Documentation/devicetree/bindings/rtc/rtc.txt b/Documentation/devicetree/bindings/rtc/rtc.txt
index a97fc6a..f93a44d 100644
--- a/Documentation/devicetree/bindings/rtc/rtc.txt
+++ b/Documentation/devicetree/bindings/rtc/rtc.txt
@@ -31,6 +31,9 @@ below.
expressed in femto Farad (fF).
The default value shall be listed (if optional),
and likewise all valid values.
+- battery-low-hw-alarm : Enable the "battery-low" output pin. This function
+ is available on the following devices:
+ - pcf2127 - pin used for alarm: INTn
Trivial RTCs
------------
--
2.7.4
