netdev - Re: issues to bring up two VSC8531 PHYs

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Date:   Thu, 13 Apr 2023 22:27:56 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Ron Eggler <ron.eggler@...tywest.com>
Cc:     Heiner Kallweit <hkallweit1@...il.com>, netdev@...r.kernel.org,
        Russell King - ARM Linux <linux@...linux.org.uk>
Subject: Re: issues to bring up two VSC8531 PHYs

> Anyways, I changed the patch specify "ethernet-phy-ieee802.3-c22" instead,
> it seems c22 is just a fallback if it's not specified per phy.txt -
> Documentation/devicetree/bindings/net/phy.txt - Linux source code (v4.14) -
> Bootlin <https://elixir.bootlin.com/linux/v4.14/source/Documentation/devicetree/bindings/net/phy.txt>

I would not trust 4.14 Documentation. That has been dead for a long
long time. We generally request you report networking issues against
the net-next tree, or the last -rcX kernel.

> I connected it with a patch cable to a laptop and fired up tcpdump on the
> laptop.
> I can see ARP requests going out (from the laptop) but VSC8531s are not
> responding (tried both ports).
> What else can I do from here, is it time to probe the RGMII signals on the
> board?

What phy-mode are you using. Generally rgmii-id is what you want, so
that the PHY adds the RGMII delays.

You can also try:

ethtool --phy-statistics ethX

The statistics are mostly about errors, not correctly received frames,
so there might not be anything useful.

     Andrew