From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753663AbaIKJVz (ORCPT ); Thu, 11 Sep 2014 05:21:55 -0400 Received: from gloria.sntech.de ([95.129.55.99]:38912 "EHLO gloria.sntech.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753612AbaIKJVw (ORCPT ); Thu, 11 Sep 2014 05:21:52 -0400 From: Heiko =?ISO-8859-1?Q?St=FCbner?= To: Doug Anderson Cc: Chris Zhong , Addy Ke , linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, linux@arm.linux.org.uk, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] ARM: dts: Switch i2c0 to 400kHz on rk3288-evb-rk808 Date: Thu, 11 Sep 2014 11:23:47 +0200 Message-ID: <14543621.jVTOtFDFto@diego> User-Agent: KMail/4.12.4 (Linux/3.13-1-amd64; KDE/4.13.3; x86_64; ; ) In-Reply-To: <1410409815-22200-1-git-send-email-dianders@chromium.org> References: <1410409815-22200-1-git-send-email-dianders@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Am Mittwoch, 10. September 2014, 21:30:15 schrieb Doug Anderson: > We should be able to talk to the PMIC at 400kHz. No need to talk at > the slow 100kHz. > > As measured by ftrace (with a bunch of extra patches, since cpufreq > for rk808 hasn't landed yet): > before this change: cpu0_set_target() => ~500us > after this change: cpu0_set_target() => ~300us > > Signed-off-by: Doug Anderson looks harmless :-) I've added it to my v3.18-next/dts branch with Addy's tags > --- > arch/arm/boot/dts/rk3288-evb-rk808.dts | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/arm/boot/dts/rk3288-evb-rk808.dts > b/arch/arm/boot/dts/rk3288-evb-rk808.dts index 36db177..ff522f8 100644 > --- a/arch/arm/boot/dts/rk3288-evb-rk808.dts > +++ b/arch/arm/boot/dts/rk3288-evb-rk808.dts > @@ -18,6 +18,7 @@ > }; > > &i2c0 { > + clock-frequency = <400000>; > status = "okay"; > > rk808: pmic@1b { From mboxrd@z Thu Jan 1 00:00:00 1970 From: heiko@sntech.de (Heiko =?ISO-8859-1?Q?St=FCbner?=) Date: Thu, 11 Sep 2014 11:23:47 +0200 Subject: [PATCH] ARM: dts: Switch i2c0 to 400kHz on rk3288-evb-rk808 In-Reply-To: <1410409815-22200-1-git-send-email-dianders@chromium.org> References: <1410409815-22200-1-git-send-email-dianders@chromium.org> Message-ID: <14543621.jVTOtFDFto@diego> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Am Mittwoch, 10. September 2014, 21:30:15 schrieb Doug Anderson: > We should be able to talk to the PMIC at 400kHz. No need to talk at > the slow 100kHz. > > As measured by ftrace (with a bunch of extra patches, since cpufreq > for rk808 hasn't landed yet): > before this change: cpu0_set_target() => ~500us > after this change: cpu0_set_target() => ~300us > > Signed-off-by: Doug Anderson looks harmless :-) I've added it to my v3.18-next/dts branch with Addy's tags > --- > arch/arm/boot/dts/rk3288-evb-rk808.dts | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/arm/boot/dts/rk3288-evb-rk808.dts > b/arch/arm/boot/dts/rk3288-evb-rk808.dts index 36db177..ff522f8 100644 > --- a/arch/arm/boot/dts/rk3288-evb-rk808.dts > +++ b/arch/arm/boot/dts/rk3288-evb-rk808.dts > @@ -18,6 +18,7 @@ > }; > > &i2c0 { > + clock-frequency = <400000>; > status = "okay"; > > rk808: pmic at 1b {