linux-kernel - Re: [PATCH] net: dsa: mv88e6xxx: Make *_c45 callbacks agree with phy_*

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Date: Mon, 22 Jan 2024 14:33:49 +0200
From: Vladimir Oltean <olteanv@...il.com>
To: Tim Menninger <tmenninger@...estorage.com>
Cc: Andrew Lunn <andrew@...n.ch>, f.fainelli@...il.com, davem@...emloft.net,
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: dsa: mv88e6xxx: Make *_c45 callbacks agree with
 phy_*_c45 callbacks

On Tue, Jan 16, 2024 at 05:51:13PM -0800, Tim Menninger wrote:
> My impression is still that the read_c45 function should agree with the
> phy_read_c45 function, but that isn't a hill I care to die on if you still
> think otherwise. Thoughts?

FWIW, Tim's approach is consistent with what drivers/net/mdio/mdio-mux.c does.

		if (parent_bus->read)
			cb->mii_bus->read = mdio_mux_read;
		if (parent_bus->write)
			cb->mii_bus->write = mdio_mux_write;
		if (parent_bus->read_c45)
			cb->mii_bus->read_c45 = mdio_mux_read_c45;
		if (parent_bus->write_c45)
			cb->mii_bus->write_c45 = mdio_mux_write_c45;

My only objection to his patch (apart from the commit message which
should indeed be more detailed) is that I would have preferred the same
"if" syntax rather than the use of a ternary operator with NULL.