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

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Date:   Wed, 3 Apr 2019 17:28:56 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Flavio Suligoi <f.suligoi@...m.it>
Cc:     Alessandro Zummo <a.zummo@...ertech.it>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "linux-rtc@...r.kernel.org" <linux-rtc@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] dt-bindings: rtc: add battery-low-hw-alarm property

On 03/04/2019 15:06:17+0000, Flavio Suligoi wrote:
> Hi Alexandre,
> 
> > Hi,
> > 
> > On 03/04/2019 16:52:44+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
> > 
> > I would name that voltage-low-alarm as not all the secondary voltages
> > are batteries.
> 
> You have right. So we can also name the property a: "voltage-low-hw-alarm". 
> I prefer to have the word "hw" in the property name, since the "sw" voltage
> low alarm is already present is some RTC drivers. 
> In this way, with the word "hw", is more clear that we are speaking about
> an hw pin signaling.
> 

Well, the device tree always describes the hardware so there is no point
in specifying hw.


-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com