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Message-ID: <a5929836-2da4-af9b-7310-73bdc05c8e83@quicinc.com>
Date:   Sun, 2 Jul 2023 18:00:36 +0800
From:   Jie Luo <quic_luoj@...cinc.com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     <hkallweit1@...il.com>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <linux@...linux.org.uk>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] net: phy: at803x: add qca8081 fifo reset on the link
 down



On 7/2/2023 12:21 AM, Andrew Lunn wrote:
>> Hi Andrew,
>> it is the PLL related registers, there is no PHY ID existed in MII register
>> 2, 3 of this block, so it can't be instantiated as the generic PHY device.
> 
> Well, phylib is going to scan those ID registers, and if it finds
> something other than 0xffff 0xffff in those two ID registers it is
> going to think a PHY is there. And then if there is no driver using
> that ID, it will instantiate a generic PHY.
> 
> You might be able to see this in /sys/bus/mdio_bus, especially if you
> don't have a DT node representing the MDIO bus.
> 
>        Andrew
Okay, understand it. thanks Andrew for pointing this.
i will check it.

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