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Date:   Tue, 5 May 2020 21:26:46 +0300
From:   Grygorii Strashko <>
To:     Oleksij Rempel <>,
        Andrew Lunn <>,
        Florian Fainelli <>,
        Heiner Kallweit <>
CC:     David Jander <>,
        "David S. Miller" <>, <>,
        <>, <>,
        Philippe Schenker <>,
        Russell King <>
Subject: Re: [PATCH net-next v3] net: phy: micrel: add phy-mode support for
 the KSZ9031 PHY

On 22/04/2020 10:21, Oleksij Rempel wrote:
> Add support for following phy-modes: rgmii, rgmii-id, rgmii-txid, rgmii-rxid.
> This PHY has an internal RX delay of 1.2ns and no delay for TX.
> The pad skew registers allow to set the total TX delay to max 1.38ns and
> the total RX delay to max of 2.58ns (configurable 1.38ns + build in
> 1.2ns) and a minimal delay of 0ns.
> According to the RGMII v1.3 specification the delay provided by PCB traces
> should be between 1.5ns and 2.0ns. The RGMII v2.0 allows to provide this
> delay by MAC or PHY. So, we configure this PHY to the best values we can
> get by this HW: TX delay to 1.38ns (max supported value) and RX delay to
> 1.80ns (best calculated delay)
> The phy-modes can still be fine tuned/overwritten by *-skew-ps
> device tree properties described in:
> Documentation/devicetree/bindings/net/micrel-ksz90x1.txt
> Signed-off-by: Oleksij Rempel <>
> ---
> changes v3:
> - change delay on RX line to 1.80ns
> - add warning if *-skew-ps properties are used together with not rgmii
>    mode.
> changes v2:
> - change RX_ID value from 0x1a to 0xa. The overflow bit was detected by
>    FIELD_PREP() build check.
>    Reported-by: kbuild test robot <>
>   drivers/net/phy/micrel.c | 128 +++++++++++++++++++++++++++++++++++++--
>   1 file changed, 123 insertions(+), 5 deletions(-)

This patch broke networking on at least 5 TI boards:

am57xx I can fix.

am437x need to investigate.

Best regards,

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