linux-kernel - Re: [PATCH v2] net/phy/vitesse: Configure RGMII skew on VSC8601, if needed

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Message-Id: <20161116.175423.1067471964290543367.davem@davemloft.net>
Date:   Wed, 16 Nov 2016 17:54:23 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     alex.g@...ptrum.com
Cc:     f.fainelli@...il.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net/phy/vitesse: Configure RGMII skew on VSC8601,
 if needed

From: Alexandru Gagniuc <alex.g@...ptrum.com>
Date: Wed, 16 Nov 2016 01:02:33 -0800

> With RGMII, we need a 1.5 to 2ns skew between clock and data lines. The
> VSC8601 can handle this internally. While the VSC8601 can set more
> fine-grained delays, the standard skew settings work out of the box.
> The same heuristic is used to determine when this skew should be enabled
> as in vsc824x_config_init().
> 
> Tested on custom board with AM3352 SOC and VSC801 PHY.
> 
> Signed-off-by: Alexandru Gagniuc <alex.g@...ptrum.com>
> ---
> Changes since v1:
>  * Added comment detailing applicability to different RGMII interfaces.

Applied.