From mboxrd@z Thu Jan 1 00:00:00 1970 From: arno@natisbad.org (Arnaud Ebalard) Date: Tue, 18 Nov 2014 00:23:53 +0100 Subject: [PATCHv1 2/3] arm: mvebu: add .dts file for Synology DS213j In-Reply-To: <546A7997.1040603@killerwolves.net> (Ben Peddell's message of "Tue, 18 Nov 2014 08:41:27 +1000") References: <1eb26f8c1946622910a7e2318c895a7082fea7e5.1416095841.git.arno@natisbad.org> <20141116020024.GC15870@lunn.ch> <87d28nb83u.fsf@natisbad.org> <546931E1.5070909@killerwolves.net> <878ujas07o.fsf@natisbad.org> <546A7997.1040603@killerwolves.net> Message-ID: <871tp1pg1i.fsf@natisbad.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi Ben, Ben Peddell writes: >>> The 5000RPM was interpolated from my measured RPM pulse rate (4200PPM) >>> of the 80mm fan in my DS211j (which uses the 150-32-35 fan config) at >>> maximum RPM. >> >> Then, I think I need to change the speed map to have 1900 RPM as max >> speed. Out of curiosity, how did you measured the RPM pulse rate >> exactly? > > I hooked a logic analyzer to the sense pin and measured the pulse rate. > > Looking at the specifications of the fan in this unit (an EC7025L12ER), > it has a maximum fan speed of 3000RPM, so it looks like it uses two > pulses per revolution and not one as I had assumed when I created the > speed map. Thanks for this feedback. Cheers, a+ From mboxrd@z Thu Jan 1 00:00:00 1970 From: arno-LkuqDEemtHBg9hUCZPvPmw@public.gmane.org (Arnaud Ebalard) Subject: Re: [PATCHv1 2/3] arm: mvebu: add .dts file for Synology DS213j Date: Tue, 18 Nov 2014 00:23:53 +0100 Message-ID: <871tp1pg1i.fsf@natisbad.org> References: <1eb26f8c1946622910a7e2318c895a7082fea7e5.1416095841.git.arno@natisbad.org> <20141116020024.GC15870@lunn.ch> <87d28nb83u.fsf@natisbad.org> <546931E1.5070909@killerwolves.net> <878ujas07o.fsf@natisbad.org> <546A7997.1040603@killerwolves.net> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <546A7997.1040603-aslSrjg9ejhWX4hkXwHRhw@public.gmane.org> (Ben Peddell's message of "Tue, 18 Nov 2014 08:41:27 +1000") Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Ben Peddell Cc: Andrew Lunn , Jason Cooper , Gregory Clement , Sebastian Hesselbarth , Mark Rutland , devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Russell King , Pawel Moll , Stephen Warren , Ian Campbell , Rob Herring , linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org List-Id: devicetree@vger.kernel.org Hi Ben, Ben Peddell writes: >>> The 5000RPM was interpolated from my measured RPM pulse rate (4200PPM) >>> of the 80mm fan in my DS211j (which uses the 150-32-35 fan config) at >>> maximum RPM. >> >> Then, I think I need to change the speed map to have 1900 RPM as max >> speed. Out of curiosity, how did you measured the RPM pulse rate >> exactly? > > I hooked a logic analyzer to the sense pin and measured the pulse rate. > > Looking at the specifications of the fan in this unit (an EC7025L12ER), > it has a maximum fan speed of 3000RPM, so it looks like it uses two > pulses per revolution and not one as I had assumed when I created the > speed map. Thanks for this feedback. Cheers, a+ -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html