Messages in this thread | | | Date | Wed, 22 Apr 2020 15:39:21 +0200 | From | Andrew Lunn <> | Subject | Re: [PATCH net-next v3] net: phy: micrel: add phy-mode support for the KSZ9031 PHY |
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On Wed, Apr 22, 2020 at 09:21:37AM +0200, 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 <o.rempel@pengutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Andrew
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