linux-kernel - [PATCH 1/2] dt-bindings: rtc: add battery-low-hw-alarm property

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Date:   Wed, 3 Apr 2019 16:52:44 +0200
From:   Flavio Suligoi <f.suligoi@...m.it>
To:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
CC:     <linux-rtc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Flavio Suligoi <f.suligoi@...m.it>
Subject: [PATCH 1/2] dt-bindings: rtc: add battery-low-hw-alarm property

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@...m.it>
---
 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