Messages in this thread Patch in this message | | | From | Thierry Reding <> | Subject | [PATCH 1/3] dt-bindings: mfd: Document the RTC present on MAX77620 | Date | Fri, 17 Apr 2020 19:08:23 +0200 |
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From: Thierry Reding <treding@nvidia.com>
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@nvidia.com> --- .../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
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