From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751483AbcFUVJI (ORCPT ); Tue, 21 Jun 2016 17:09:08 -0400 Received: from down.free-electrons.com ([37.187.137.238]:45503 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750744AbcFUVJF (ORCPT ); Tue, 21 Jun 2016 17:09:05 -0400 Date: Tue, 21 Jun 2016 23:07:39 +0200 From: Alexandre Belloni To: Rob Herring Cc: Andrey Smirnov , rtc-linux@googlegroups.com, Alessandro Zummo , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 03/13] RTC: ds1307: Add DS1341 specific power-saving options Message-ID: <20160621210739.GY5809@piout.net> References: <1465970379-14703-1-git-send-email-andrew.smirnov@gmail.com> <1465970379-14703-4-git-send-email-andrew.smirnov@gmail.com> <20160619142934.GA8522@rob-hp-laptop> <20160621204904.GA9779@rob-hp-laptop> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160621204904.GA9779@rob-hp-laptop> User-Agent: Mutt/1.6.0 (2016-04-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 21/06/2016 at 15:49:04 -0500, Rob Herring wrote : > So wouldn't you want to set one mode while running and the lower power > mode while suspended? I'm trying to understand the frequency of changing > this. If it is always one setting for a board, then yes it belongs in > DT. If it is a user decision, then it probably shouldn't be in DT. > > Seeing as these are reused, I've probably already had this discussion... > I would agree with Rob here. It may be better to provide a sysfs interface to configure that particular behavior. This is usually ok because the use case is: - the RTC is not configured, time has never been set - time is set for the first time - the user can set the oscillator mode/detection/... - on subsequent reboots, the mode is kept alongside the time and date I would advise against trying to set a mode automatically in the driver because you may have unexpected power cuts and it may then let the RTC consume more power than what you really want. > > > They should have vendor prefix and be explicit that they are boolean. > > > > I was trying to be consistent with ds1339 and ds1390 bindings which do > > not have vendor prefixes. Will fix in v2. > > Okay, then they are fine if you are using existing properties. Perhaps > these should all be in a common binding doc though. > I'll try to collect the existing common properties and write that doc this week. -- Alexandre Belloni, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Sender: rtc-linux@googlegroups.com Received: from mail.free-electrons.com (down.free-electrons.com. [37.187.137.238]) by gmr-mx.google.com with ESMTP id f138si147019wmf.3.2016.06.21.14.07.40 for ; Tue, 21 Jun 2016 14:07:40 -0700 (PDT) Date: Tue, 21 Jun 2016 23:07:39 +0200 From: Alexandre Belloni To: Rob Herring Cc: Andrey Smirnov , rtc-linux@googlegroups.com, Alessandro Zummo , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [rtc-linux] Re: [PATCH 03/13] RTC: ds1307: Add DS1341 specific power-saving options Message-ID: <20160621210739.GY5809@piout.net> References: <1465970379-14703-1-git-send-email-andrew.smirnov@gmail.com> <1465970379-14703-4-git-send-email-andrew.smirnov@gmail.com> <20160619142934.GA8522@rob-hp-laptop> <20160621204904.GA9779@rob-hp-laptop> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 In-Reply-To: <20160621204904.GA9779@rob-hp-laptop> Reply-To: rtc-linux@googlegroups.com List-ID: List-Post: , List-Help: , List-Archive: , List-Unsubscribe: , On 21/06/2016 at 15:49:04 -0500, Rob Herring wrote : > So wouldn't you want to set one mode while running and the lower power > mode while suspended? I'm trying to understand the frequency of changing > this. If it is always one setting for a board, then yes it belongs in > DT. If it is a user decision, then it probably shouldn't be in DT. > > Seeing as these are reused, I've probably already had this discussion... > I would agree with Rob here. It may be better to provide a sysfs interface to configure that particular behavior. This is usually ok because the use case is: - the RTC is not configured, time has never been set - time is set for the first time - the user can set the oscillator mode/detection/... - on subsequent reboots, the mode is kept alongside the time and date I would advise against trying to set a mode automatically in the driver because you may have unexpected power cuts and it may then let the RTC consume more power than what you really want. > > > They should have vendor prefix and be explicit that they are boolean. > > > > I was trying to be consistent with ds1339 and ds1390 bindings which do > > not have vendor prefixes. Will fix in v2. > > Okay, then they are fine if you are using existing properties. Perhaps > these should all be in a common binding doc though. > I'll try to collect the existing common properties and write that doc this week. -- Alexandre Belloni, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com -- You received this message because you are subscribed to "rtc-linux". Membership options at http://groups.google.com/group/rtc-linux . Please read http://groups.google.com/group/rtc-linux/web/checklist before submitting a driver. --- You received this message because you are subscribed to the Google Groups "rtc-linux" group. To unsubscribe from this group and stop receiving emails from it, send an email to rtc-linux+unsubscribe@googlegroups.com. For more options, visit https://groups.google.com/d/optout. From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexandre Belloni Subject: Re: [PATCH 03/13] RTC: ds1307: Add DS1341 specific power-saving options Date: Tue, 21 Jun 2016 23:07:39 +0200 Message-ID: <20160621210739.GY5809@piout.net> References: <1465970379-14703-1-git-send-email-andrew.smirnov@gmail.com> <1465970379-14703-4-git-send-email-andrew.smirnov@gmail.com> <20160619142934.GA8522@rob-hp-laptop> <20160621204904.GA9779@rob-hp-laptop> Reply-To: rtc-linux-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Return-path: Sender: rtc-linux-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org Content-Disposition: inline In-Reply-To: <20160621204904.GA9779@rob-hp-laptop> List-Post: , List-Help: , List-Archive: , List-Unsubscribe: , To: Rob Herring Cc: Andrey Smirnov , rtc-linux-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org, Alessandro Zummo , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: devicetree@vger.kernel.org On 21/06/2016 at 15:49:04 -0500, Rob Herring wrote : > So wouldn't you want to set one mode while running and the lower power > mode while suspended? I'm trying to understand the frequency of changing > this. If it is always one setting for a board, then yes it belongs in > DT. If it is a user decision, then it probably shouldn't be in DT. > > Seeing as these are reused, I've probably already had this discussion... > I would agree with Rob here. It may be better to provide a sysfs interface to configure that particular behavior. This is usually ok because the use case is: - the RTC is not configured, time has never been set - time is set for the first time - the user can set the oscillator mode/detection/... - on subsequent reboots, the mode is kept alongside the time and date I would advise against trying to set a mode automatically in the driver because you may have unexpected power cuts and it may then let the RTC consume more power than what you really want. > > > They should have vendor prefix and be explicit that they are boolean. > > > > I was trying to be consistent with ds1339 and ds1390 bindings which do > > not have vendor prefixes. Will fix in v2. > > Okay, then they are fine if you are using existing properties. Perhaps > these should all be in a common binding doc though. > I'll try to collect the existing common properties and write that doc this week. -- Alexandre Belloni, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com -- You received this message because you are subscribed to "rtc-linux". Membership options at http://groups.google.com/group/rtc-linux . Please read http://groups.google.com/group/rtc-linux/web/checklist before submitting a driver. --- You received this message because you are subscribed to the Google Groups "rtc-linux" group. To unsubscribe from this group and stop receiving emails from it, send an email to rtc-linux+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit https://groups.google.com/d/optout.