Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754913AbaGKQdv (ORCPT ); Fri, 11 Jul 2014 12:33:51 -0400 Received: from mail-vc0-f179.google.com ([209.85.220.179]:38206 "EHLO mail-vc0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754515AbaGKQds (ORCPT ); Fri, 11 Jul 2014 12:33:48 -0400 MIME-Version: 1.0 In-Reply-To: <53C002BE.90805@nvidia.com> References: <1405028569-14253-1-git-send-email-ttynkkynen@nvidia.com> <1405028569-14253-13-git-send-email-ttynkkynen@nvidia.com> <20140711091207.GY23218@tbergstrom-lnx.Nvidia.com> <20140711145735.GB6523@ulmo> <53BFFEAD.7000405@nvidia.com> <20140711151501.GA25810@ulmo> <53C002BE.90805@nvidia.com> Date: Fri, 11 Jul 2014 09:33:47 -0700 X-Google-Sender-Auth: M_ArMAqHvzSgRBTQs2Iqsba8QC4 Message-ID: Subject: Re: [PATCH 12/13] cpufreq: Add cpufreq driver for Tegra124 From: Andrew Bresticker To: Tuomas Tynkkynen Cc: Thierry Reding , Peter De Schrijver , Viresh Kumar , "linux-tegra@vger.kernel.org" , Linux Kernel Mailing List , "linux-arm-kernel@lists.infradead.org" , "linux-pm@vger.kernel.org" , Stephen Warren , Prashant Gaikwad , Mike Turquette , "Rafael J. Wysocki" , "devicetree@vger.kernel.org" Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jul 11, 2014 at 8:29 AM, Tuomas Tynkkynen wrote: > > On the hardware level, the two I2C controllers sharing the same pins > have knowledge of each other and won't start transmitting if the bus > is busy (something different from the usual I2C arbitration, that is). > I guess on the kernel side there could be a problem if the voltage register > is marked cached in the PMIC driver's regmap. Yeah, in our tree we have a hack to disable regcache for SD0_VOLTAGE. Other than the value reported to userspace being wrong, leaving it as cacheable shouldn't be an issue if no other drivers try to read/write that register. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/