linux-kernel - Re: [PATCH net-next 3/3] net: phy: mscc: implement RGMII skew delay configuration

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Date:   Thu, 27 Feb 2020 17:01:49 +0100
From:   Antoine Tenart <antoine.tenart@...tlin.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Antoine Tenart <antoine.tenart@...tlin.com>, davem@...emloft.net,
        f.fainelli@...il.com, hkallweit1@...il.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, foss@...il.net
Subject: Re: [PATCH net-next 3/3] net: phy: mscc: implement RGMII skew delay
 configuration

Hello Andrew,

On Thu, Feb 27, 2020 at 04:51:28PM +0100, Andrew Lunn wrote:
> On Thu, Feb 27, 2020 at 04:28:59PM +0100, Antoine Tenart wrote:
> > This patch adds support for configuring the RGMII skews in Rx and Tx
> > thanks to properties defined in the device tree.
> 
> Hi Antoine
> 
> What you are not handling here in this patchset is the four RGMII
> modes, and what they mean in terms of delay:
> 
>         PHY_INTERFACE_MODE_RGMII,
>         PHY_INTERFACE_MODE_RGMII_ID,
>         PHY_INTERFACE_MODE_RGMII_RXID,
>         PHY_INTERFACE_MODE_RGMII_TXID,
> 
> The PHY driver should be adding delays based on these
> values. Generally, that is enough to make the link work. You only need
> additional skew in DT when you need finer grain control than what
> these provide.

Oh, that's right. I'll fix the series and resubmit.

Thanks!
Antoine

-- 
Antoine Ténart, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com