netdev - Re: [PATCH net-next v2 2/2] net: dsa: mv88e6xxx: Return -ENODEV when C45 not supported

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Message-ID: <440652f1-428a-42f3-bb5e-d14d74cf5e3b@gmail.com>
Date: Sun, 4 Feb 2024 17:07:53 -0800
From: Florian Fainelli <f.fainelli@...il.com>
To: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
 Russell King <linux@...linux.org.uk>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Vladimir Oltean <olteanv@...il.com>
Cc: netdev@...r.kernel.org, Tim Menninger <tmenninger@...estorage.com>
Subject: Re: [PATCH net-next v2 2/2] net: dsa: mv88e6xxx: Return -ENODEV when
 C45 not supported

On 2/4/2024 3:14 PM, Andrew Lunn wrote:
> MDIO bus drivers can return -ENODEV when they know the bus does not
> have a device at the given address, e.g. because of hardware
> limitation. One such limitation is that the bus does not support C45
> at all. This is more efficient than returning 0xffff, since it
> immediately stops the probing on the given address, where as further
> reads can be made when 0xffff is returned.
> 
> Signed-off-by: Andrew Lunn <andrew@...n.ch>

Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>
-- 
Florian