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Message-ID: <20131003105228.GK3973@tbergstrom-lnx.Nvidia.com>
Date: Thu, 3 Oct 2013 13:52:28 +0300
From: Peter De Schrijver <pdeschrijver@...dia.com>
To: Stephen Warren <swarren@...dotorg.org>
CC: Mike Turquette <mturquette@...aro.org>,
Prashant Gaikwad <pgaikwad@...dia.com>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] clk: tegra: PLLE spread spectrum control
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.
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