Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752706AbbHEMmS (ORCPT ); Wed, 5 Aug 2015 08:42:18 -0400 Received: from mail-pa0-f41.google.com ([209.85.220.41]:32904 "EHLO mail-pa0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751991AbbHEMmQ (ORCPT ); Wed, 5 Aug 2015 08:42:16 -0400 Message-ID: <55C204A1.3060206@linaro.org> Date: Wed, 05 Aug 2015 18:12:09 +0530 From: Vaibhav Hiremath User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.8.0 MIME-Version: 1.0 To: Shubhrajyoti Datta CC: linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, Wolfram Sang , Yi Zhang , linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org, robert.jarzmik@free.fr Subject: Re: [PATCH-v5 2/5] i2c: pxa: enable/disable i2c module across msg xfer References: <1437482466-16126-1-git-send-email-vaibhav.hiremath@linaro.org> <1437482466-16126-3-git-send-email-vaibhav.hiremath@linaro.org> In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 850 Lines: 33 On Wednesday 05 August 2015 04:16 PM, Shubhrajyoti Datta wrote: > hi , > On Tue, Jul 21, 2015 at 6:11 PM, Vaibhav Hiremath > wrote: >> From: Yi Zhang >> >> Enable i2c module/unit before transmission and disable when it >> finishes. >> >> why? >> It's because the i2c bus may be disturbed if the slave device, >> typically a touch, powers on. > > Why should that be an issue? > Is it an errata. > Not I am aware of. > In which mode it is an issue slave / master or both? > since it talks about touch, I expect it to be master mode. Thanks, Vaibhav -- 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/