netdev - Re: [PATCH 1/2] net: phy: micrel: Add KS8851 PHY support

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Message-ID: <19fac48e-dd17-26d8-0ebc-c08b51876861@denx.de>
Date:   Sun, 3 Jan 2021 13:55:22 +0100
From:   Marek Vasut <marex@...x.de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, Heiner Kallweit <hkallweit1@...il.com>,
        Lukas Wunner <lukas@...ner.de>
Subject: Re: [PATCH 1/2] net: phy: micrel: Add KS8851 PHY support

On 12/30/20 4:43 PM, Andrew Lunn wrote:
> On Wed, Dec 30, 2020 at 01:53:57PM +0100, Marek Vasut wrote:
>> The KS8851 has a reduced internal PHY, which is accessible through its
>> registers at offset 0xe4. The PHY is compatible with KS886x PHY present
>> in Micrel switches, except the PHY ID Low/High registers are swapped.
> 
> Can you intercept the reads in the KS8851 driver and swap them back
> again? The mv88e6xxx driver does something similar. The mv88e6393
> family of switches have PHYs with the Marvell OUI but no device ID. So
> the code traps these reads and provides an ID.

I would prefer to keep this as-is, since then the PHY driver can match 
on these swapped IDs and discern the PHY from PHY present in the KS886x 
switch.