From: Alexandre Belloni <alexandre.belloni@bootlin.com>
To: Flavio Suligoi <f.suligoi@asem.it>
Cc: Alessandro Zummo <a.zummo@towertech.it>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
"linux-rtc@vger.kernel.org" <linux-rtc@vger.kernel.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/2] dt-bindings: rtc: add battery-low-hw-alarm property
Date: Wed, 3 Apr 2019 17:28:56 +0200 [thread overview]
Message-ID: <20190403152856.GP22216@piout.net> (raw)
In-Reply-To: <b45fc9a86a0d4126ad6d8dda9c883043@asem.it>
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@asem.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
next prev parent reply other threads:[~2019-04-03 15:29 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-03 14:52 [PATCH 1/2] dt-bindings: rtc: add battery-low-hw-alarm property Flavio Suligoi
2019-04-03 14:52 ` [PATCH 2/2] rtc: pcf2127: add battery-low INTn generation Flavio Suligoi
2019-04-03 15:08 ` Alexandre Belloni
2019-04-03 15:14 ` Flavio Suligoi
2019-04-03 15:31 ` Alexandre Belloni
2019-04-03 15:49 ` Flavio Suligoi
2019-04-03 15:56 ` Alexandre Belloni
2019-04-03 16:09 ` Flavio Suligoi
2019-04-03 16:15 ` Alexandre Belloni
2019-04-03 16:20 ` Flavio Suligoi
2019-04-03 14:57 ` [PATCH 1/2] dt-bindings: rtc: add battery-low-hw-alarm property Alexandre Belloni
2019-04-03 15:06 ` Flavio Suligoi
2019-04-03 15:28 ` Alexandre Belloni [this message]
2019-04-03 15:32 ` Flavio Suligoi
2019-04-06 6:07 ` Rob Herring
2019-04-06 12:55 ` Alexandre Belloni
2019-04-08 7:22 ` Flavio Suligoi
2019-04-09 1:18 ` Rob Herring
2019-04-10 8:04 ` Flavio Suligoi
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