linux-kernel - Re: [PATCH net-next 1/6] ARM: dts: imx6qp-prtwd3: update RGMII delays for sja1105 switch

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Date:   Fri, 15 Oct 2021 10:16:07 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Vladimir Oltean <vladimir.oltean@....com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Prasanna Vengateshan <prasanna.vengateshan@...rochip.com>,
        Ansuel Smith <ansuelsmth@...il.com>,
        Alvin Šipraga <alsi@...g-olufsen.dk>
Subject: Re: [PATCH net-next 1/6] ARM: dts: imx6qp-prtwd3: update RGMII delays
 for sja1105 switch

On 10/13/21 3:23 PM, Vladimir Oltean wrote:
> In the new behavior, the sja1105 driver expects there to be explicit
> RGMII delays present on the fixed-link ports, otherwise it will complain
> that it falls back to legacy behavior, which is to apply RGMII delays
> incorrectly derived from the phy-mode string.
> 
> In this case, the legacy behavior of the driver is to apply both RX and
> TX delays. To preserve that, add explicit 2 nanosecond delays, which are
> identical with what the driver used to add (a 90 degree phase shift).
> The delays from the phy-mode are ignored by new kernels (it's still
> RGMII as long as it's "rgmii*" something), and the explicit
> {rx,tx}-internal-delay-ps properties are ignored by old kernels, so the
> change works both ways.
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian