From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753921Ab3JCKwd (ORCPT ); Thu, 3 Oct 2013 06:52:33 -0400 Received: from hqemgate16.nvidia.com ([216.228.121.65]:8472 "EHLO hqemgate16.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752216Ab3JCKwb (ORCPT ); Thu, 3 Oct 2013 06:52:31 -0400 X-PGP-Universal: processed; by hqnvupgp08.nvidia.com on Thu, 03 Oct 2013 03:48:35 -0700 Date: Thu, 3 Oct 2013 13:52:28 +0300 From: Peter De Schrijver To: Stephen Warren CC: Mike Turquette , Prashant Gaikwad , "linux-arm-kernel@lists.infradead.org" , "linux-tegra@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH] clk: tegra: PLLE spread spectrum control Message-ID: <20131003105228.GK3973@tbergstrom-lnx.Nvidia.com> References: <1380209654-25458-1-git-send-email-pdeschrijver@nvidia.com> <524B28EA.40702@wwwdotorg.org> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <524B28EA.40702@wwwdotorg.org> X-NVConfidentiality: public User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. Cheers, Peter.