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Message-ID: <5ca84214.1c69fb81.e3ace.21e5@mx.google.com> Date: Sat, 06 Apr 2019 01:07:13 -0500 From: Rob Herring <robh@...nel.org> To: Flavio Suligoi <f.suligoi@...m.it> Cc: Alessandro Zummo <a.zummo@...ertech.it>, Alexandre Belloni <alexandre.belloni@...tlin.com>, Mark Rutland <mark.rutland@....com>, linux-rtc@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 1/2] dt-bindings: rtc: add battery-low-hw-alarm property On Wed, Apr 03, 2019 at 04:52:44PM +0200, Flavio Suligoi wrote: > 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 Boolean? If there's cases where which pin is selectable, then we'd need this to take a value. Not sure how likely that is? Rob
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