netdev - Re: [PATCH net-next 2/2] net: mdio-mux: be compatible with parent buses which only support C45

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Message-ID: <28eac550-e48c-401d-a111-05c6b4c9e4c0@lunn.ch>
Date: Wed, 13 Dec 2023 23:49:43 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Vladimir Oltean <vladimir.oltean@....com>
Cc: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>
Subject: Re: [PATCH net-next 2/2] net: mdio-mux: be compatible with parent
 buses which only support C45

On Wed, Dec 13, 2023 at 05:27:12PM +0200, Vladimir Oltean wrote:
> After the mii_bus API conversion to a split read() / read_c45(), there
> might be MDIO parent buses which only populate the read_c45() and
> write_c45() function pointers but not the C22 variants.
> 
> We haven't seen these in the wild paired with MDIO multiplexers, but
> Andrew points out we should treat the corner case.
> 
> Link: https://lore.kernel.org/netdev/4ccd7dc9-b611-48aa-865f-68d3a1327ce8@lunn.ch/
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew