From mboxrd@z Thu Jan 1 00:00:00 1970 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 Message-ID: <20200417170825.2551367-1-thierry.reding@gmail.com> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: Sender: linux-tegra-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Lee Jones , Rob Herring , Alessandro Zummo , Alexandre Belloni Cc: Jon Hunter , devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-rtc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-tegra@vger.kernel.org From: Thierry Reding 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 --- .../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 = ; }; }; + + rtc { + wakeup-source; + }; }; -- 2.24.1