netdev - Re: [PATCH 0/3] staging: octeon: Convert to use phylink

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Date:   Thu, 13 Apr 2023 19:12:29 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Ladislav Michl <oss-lists@...ops.cz>
Cc:     linux-staging@...ts.linux.dev, netdev@...r.kernel.org,
        linux-mips@...r.kernel.org,
        Chris Packham <chris.packham@...iedtelesis.co.nz>
Subject: Re: [PATCH 0/3] staging: octeon: Convert to use phylink

> > > However testing revealed some glitches:
> > > 1. driver previously returned -EPROBE_DEFER when no phy was attached.
> > > Phylink stack does not seem to do so, which end up with:
> > > 
> > > Marvell PHY driver as a module:
> > > octeon_ethernet 11800a0000000.pip eth0: configuring for inband/1000base-x link mode
> > > octeon_ethernet 11800a0000000.pip eth1: PHY [8001180000001800:00] driver [Generic PHY] (irq=POLL)
> > > octeon_ethernet 11800a0000000.pip eth1: configuring for phy/sgmii link mode
> > > octeon_ethernet 11800a0000000.pip eth2: PHY [8001180000001800:01] driver [Generic PHY] (irq=POLL)
> > > octeon_ethernet 11800a0000000.pip eth2: configuring for phy/sgmii link mode
> > > octeon_ethernet 11800a0000000.pip eth0: switched to inband/sgmii link mode
> > > octeon_ethernet 11800a0000000.pip eth0: PHY [i2c:sfp:16] driver [Marvell 88E1111] (irq=POLL)
> > > octeon_ethernet 11800a0000000.pip eth3: PHY [8001180000001800:02] driver [Marvell 88E1340S] (irq=25)
> > > octeon_ethernet 11800a0000000.pip eth3: configuring for phy/sgmii link mode
> > > octeon_ethernet 11800a0000000.pip eth4: PHY [8001180000001800:03] driver [Marvell 88E1340S] (irq=25)
> > > octeon_ethernet 11800a0000000.pip eth4: configuring for phy/sgmii link mode
> > > octeon_ethernet 11800a0000000.pip eth1: Link is Up - 100Mbps/Full - flow control off
> > > 
> > > Marvell PHY driver built-in:
> > > octeon_ethernet 11800a0000000.pip eth0: configuring for inband/1000base-x link mode
> > > octeon_ethernet 11800a0000000.pip eth1: PHY [8001180000001800:00] driver [Marvell 88E1340S] (irq=25)
> > > octeon_ethernet 11800a0000000.pip eth1: configuring for phy/sgmii link mode
> > > Error: Driver 'Marvell 88E1101' is already registered, aborting...
> > > libphy: Marvell 88E1101: Error -16 in registering driver
> > > Error: Driver 'Marvell 88E1101' is already registered, aborting...
> > > libphy: Marvell 88E1101: Error -16 in registering driver
> > 
> > This is very odd. But it could be a side effect of the
> > compatible. Please try with it removed.
> 
> That does not make any difference.

Then i have no idea. I would suggest you add a WARN_ON() in
phy_driver_register() so we get a backtrace. That might give a clue
why it is getting registered multiple times.

	 Andrew