netdev - Re: [PATCH net-next 3/3] net: phy: realtek: add support for the 2.5Gbps PHY in RTL8125

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Date:   Thu, 8 Aug 2019 22:24:46 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        David Miller <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 3/3] net: phy: realtek: add support for the
 2.5Gbps PHY in RTL8125

On 08.08.2019 22:20, Andrew Lunn wrote:
>> I have a contact in Realtek who provided the information about
>> the vendor-specific registers used in the patch. I also asked for
>> a method to auto-detect 2.5Gbps support but have no feedback so far.
>> What may contribute to the problem is that also the integrated 1Gbps
>> PHY's (all with the same PHY ID) differ significantly from each other,
>> depending on the network chip version.
> 
> Hi Heiner
> 
> Some of the PHYs embedded in Marvell switches have an OUI, but no
> product ID. We work around this brokenness by trapping the reads to
> the ID registers in the MDIO bus controller driver and inserting the
> switch product ID. The Marvell PHY driver then recognises these IDs
> and does the right thing.
> 
> Maybe you can do something similar here?
> 
Yes, this would be an idea. Let me check.

>       Andrew
> 
Thanks, Heiner