netdev - Re: [PATCH] net: phy: allow scanning busses with missing phys

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Message-Id: <20180425.130120.435606346755827260.davem@davemloft.net>
Date:   Wed, 25 Apr 2018 13:01:20 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     alexandre.belloni@...tlin.com
Cc:     andrew@...n.ch, f.fainelli@...il.com, Allan.Nielsen@...rosemi.com,
        thomas.petazzoni@...tlin.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: phy: allow scanning busses with missing phys

From: Alexandre Belloni <alexandre.belloni@...tlin.com>
Date: Tue, 24 Apr 2018 18:09:04 +0200

> Some MDIO busses will error out when trying to read a phy address with no
> phy present at that address. In that case, probing the bus will fail
> because __mdiobus_register() is scanning the bus for all possible phys
> addresses.
> 
> In case MII_PHYSID1 returns -EIO or -ENODEV, consider there is no phy at
> this address and set the phy ID to 0xffffffff which is then properly
> handled in get_phy_device().
> 
> Suggested-by: Andrew Lunn <andrew@...n.ch>
> Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>

Applied, thank you.