From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Warren Subject: Re: [PATCH] clk: tegra: PLLE spread spectrum control Date: Thu, 03 Oct 2013 09:23:55 -0600 Message-ID: <524D8C0B.90707@wwwdotorg.org> References: <1380209654-25458-1-git-send-email-pdeschrijver@nvidia.com> <524B28EA.40702@wwwdotorg.org> <20131003105228.GK3973@tbergstrom-lnx.Nvidia.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20131003105228.GK3973-Rysk9IDjsxmJz7etNGeUX8VPkgjIgRvpAL8bYrjMMd8@public.gmane.org> Sender: linux-tegra-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Peter De Schrijver Cc: Mike Turquette , Prashant Gaikwad , "linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org" , "linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" List-Id: linux-tegra@vger.kernel.org On 10/03/2013 04:52 AM, Peter De Schrijver wrote: > On Tue, Oct 01, 2013 at 09:56:26PM +0200, Stephen Warren wrote: >> On 09/26/2013 09:34 AM, Peter De Schrijver wrote: >>> Add spread spectrum control for PLLE in Tegra114. >> >> It would be useful to have some description of the end-user-visible >> benefit of this change; why is it useful? > > spread spectrum clocking is a technique to reduce EMI caused by the clock > signal by modulating the frequency with a low frequency signal. This should > reduce interference with eg. Wifi or cellular modems on the same board. Great. The intent of my request was for that information to be included in the patch description.