netdev - Re: [PATCH v5 net-next] net: phy: Add Edge-rate driver for Microsemi PHYs.

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Message-Id: <20161004.004859.1105270097322633239.davem@davemloft.net>
Date:   Tue, 04 Oct 2016 00:48:59 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     Raju.Lakkaraju@...rosemi.com
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        f.fainelli@...il.com, Allan.Nielsen@...rosemi.com, andrew@...n.ch
Subject: Re: [PATCH v5 net-next] net: phy: Add Edge-rate driver for
 Microsemi PHYs.

From: Raju Lakkaraju <Raju.Lakkaraju@...rosemi.com>
Date: Mon, 3 Oct 2016 12:53:13 +0530

> From: Raju Lakkaraju <Raju.Lakkaraju@...rosemi.com>
> 
> Edge-rate:
> As system and networking speeds increase, a signal's output transition,
> also know as the edge rate or slew rate (V/ns), takes on greater importance
> because high-speed signals come with a price. That price is an assortment of
> interference problems like ringing on the line, signal overshoot and
> undershoot, extended signal settling times, crosstalk noise, transmission
> line reflections, false signal detection by the receiving device and
> electromagnetic interference (EMI) -- all of which can negate the potential
> gains designers are seeking when they try to increase system speeds through
> the use of higher performance logic devices. The fact is, faster signaling
> edge rates can cause a higher level of electrical noise or other type of
> interference that can actually lead to slower line speeds and lower maximum
> system frequencies. This parameter allow the board designers to change the
> driving strange, and thereby change the EMI behavioral.
> 
> Edge-rate parameters (vddmac, edge-slowdown) get from Device Tree.
> 
> Tested on Beaglebone Black with VSC 8531 PHY.
> 
> Signed-off-by: Raju Lakkaraju <Raju.Lakkaraju@...rosemi.com>

Applied, thanks.