netdev - Re: [PATCH 1/3] ARM: dts: imx51: ZII: Add missing phy-mode

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Date:   Mon, 10 Apr 2023 16:56:20 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     Russell King <rmk+kernel@...linux.org.uk>, shawnguo@...nel.org,
        s.hauer@...gutronix.de, arm-soc <arm@...nel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH 1/3] ARM: dts: imx51: ZII: Add missing phy-mode

> hmmm... why does this work?
> 
> would you mind adding this small debug print and booting again?

mv88e6xxx_translate_cmode: cmode 4, supported: supported=7

CMODE 4 is 'RMII PHY' or 'RMII to PHY', depending on if it has found a
PHY or not.

mv88e6085 mdio_mux-0.1:00: phylink_validate: supported_interfaces=1,3,7, interface rev-rmii
mv88e6085 mdio_mux-0.1:00: phylink_validate: supported_interfaces=1,3,7, interface rev-rmii
mv88e6085 mdio_mux-0.1:00: configuring for fixed/rev-rmii link mode

Both calls to phylink_validate() then returning -EINVAL.

The first call is from phylink_create(), which does not check the
return value.

The second call is from phylink_parse_fixedlink(), which also does not
check the return code.

This is a bit fragile, all it would need is for these return values to
be checked and it would break. So i think cmode 4 should return
REVRMII and cmode 5 shoud be RMII. I will submit a patch making this
change.

	Andrew