linux-kernel - Re: [PATCH] clk: tegra: PLLE spread spectrum control

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Message-ID: <524D8C0B.90707@wwwdotorg.org>
Date:	Thu, 03 Oct 2013 09:23:55 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Peter De Schrijver <pdeschrijver@...dia.com>
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 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.

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