From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752476AbaIKEaj (ORCPT ); Thu, 11 Sep 2014 00:30:39 -0400 Received: from mail-pa0-f48.google.com ([209.85.220.48]:39202 "EHLO mail-pa0-f48.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752434AbaIKEah (ORCPT ); Thu, 11 Sep 2014 00:30:37 -0400 From: Doug Anderson To: Heiko Stuebner Cc: Chris Zhong , Addy Ke , linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, Doug Anderson , 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: [PATCH] ARM: dts: Switch i2c0 to 400kHz on rk3288-evb-rk808 Date: Wed, 10 Sep 2014 21:30:15 -0700 Message-Id: <1410409815-22200-1-git-send-email-dianders@chromium.org> X-Mailer: git-send-email 2.1.0.rc2.206.gedb03e5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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 { -- 2.1.0.rc2.206.gedb03e5