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

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Message-ID: <855e8401-cded-8418-bb07-fa97fe0bb769@gmail.com>
Date:   Tue, 24 Apr 2018 18:09:15 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Andrew Lunn <andrew@...n.ch>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Allan Nielsen <Allan.Nielsen@...rosemi.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: phy: allow scanning busses with missing phys

On 04/24/2018 09:09 AM, Alexandre Belloni wrote:
> 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>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian