From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED, USER_AGENT_MUTT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A1DB9C10F0B for ; Wed, 3 Apr 2019 15:29:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6EFD2206DD for ; Wed, 3 Apr 2019 15:29:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726628AbfDCP3B (ORCPT ); Wed, 3 Apr 2019 11:29:01 -0400 Received: from relay8-d.mail.gandi.net ([217.70.183.201]:56215 "EHLO relay8-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725990AbfDCP3B (ORCPT ); Wed, 3 Apr 2019 11:29:01 -0400 X-Originating-IP: 109.213.83.19 Received: from localhost (alyon-652-1-60-19.w109-213.abo.wanadoo.fr [109.213.83.19]) (Authenticated sender: alexandre.belloni@bootlin.com) by relay8-d.mail.gandi.net (Postfix) with ESMTPSA id 246621BF213; Wed, 3 Apr 2019 15:28:57 +0000 (UTC) Date: Wed, 3 Apr 2019 17:28:56 +0200 From: Alexandre Belloni To: Flavio Suligoi Cc: Alessandro Zummo , Rob Herring , Mark Rutland , "linux-rtc@vger.kernel.org" , "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH 1/2] dt-bindings: rtc: add battery-low-hw-alarm property Message-ID: <20190403152856.GP22216@piout.net> References: <1554303165-24813-1-git-send-email-f.suligoi@asem.it> <20190403145709.GN22216@piout.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.11.3 (2019-02-01) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 > > > --- > > > 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