From: Thierry Reding <treding@xxxxxxxxxx>
The RTC present on MAX77620 can be used to generate an alarm at a given
time, which in turn can be used as a wakeup source for the system if it
is properly wired up.
Document how to enable the RTC to act as a wakeup source.
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
.../devicetree/bindings/mfd/max77620.txt | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/Documentation/devicetree/bindings/mfd/max77620.txt b/Documentation/devicetree/bindings/mfd/max77620.txt
index 5a642a51d58e..f05005b0993e 100644
--- a/Documentation/devicetree/bindings/mfd/max77620.txt
+++ b/Documentation/devicetree/bindings/mfd/max77620.txt
@@ -125,6 +125,17 @@ MAX77663 supports 20, 40, 80, 160, 320, 640, 1280 and 2540 microseconds.
control) then, GPIO1/nRST_IO goes LOW.
this property is valid for max20024 only.
+Realtime Clock
+--------------
+The MAX77620 family of power management ICs contain a realtime clock block
+that can be used to keep track of time even when the system is powered off.
+
+The realtime clock can also be programmed to trigger alerts, which can be
+used to wake the system up from sleep. In order to configure the RTC to act
+as a wakeup source, add an "rtc" child node and add the "wakeup-source"
+property.
+
+
For DT binding details of different sub modules like GPIO, pincontrol,
regulator, power, please refer respective device-tree binding document
under their respective sub-system directories.
@@ -159,4 +170,8 @@ max77620@3c {
maxim,fps-event-source = <MAX77620_FPS_EVENT_SRC_SW>;
};
};
+
+ rtc {
+ wakeup-source;
+ };
};
--
2.24.1
