On Tue, Apr 28, 2020 at 05:28:30PM +0200, Geert Uytterhoeven wrote:
> This triggers on Renesas Salvator-X(S):
>
> Micrel KSZ9031 Gigabit PHY e6800000.ethernet-ffffffff:00:
> *-skew-ps values should be used only with phy-mode = "rgmii"
>
> which uses:
>
> phy-mode = "rgmii-txid";
>
> and:
>
> rxc-skew-ps = <1500>;
>
> If I understand Documentation/devicetree/bindings/net/ethernet-controller.yaml
> correctly:
Hi Geert
Checking for skews which might contradict the PHY-mode is new. I think
this is the first PHY driver to do it. So i'm not too surprised it has
triggered a warning, or there is contradictory documentation.
Your use cases is reasonable. Have the normal transmit delay, and a
bit shorted receive delay. So we should allow it. It just makes the
validation code more complex :-(
Andrew
