From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vaibhav Hiremath Subject: Re: [PATCH-v5 2/5] i2c: pxa: enable/disable i2c module across msg xfer Date: Wed, 05 Aug 2015 18:12:09 +0530 Message-ID: <55C204A1.3060206@linaro.org> References: <1437482466-16126-1-git-send-email-vaibhav.hiremath@linaro.org> <1437482466-16126-3-git-send-email-vaibhav.hiremath@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-i2c-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Shubhrajyoti Datta Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Wolfram Sang , Yi Zhang , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, robert.jarzmik-GANU6spQydw@public.gmane.org List-Id: devicetree@vger.kernel.org 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