netdev - Re: [PATCH 10/19] usbnet: smsc95xx: Replace smsc95xx_mdio_read() with phy

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Date:   Fri, 4 Jan 2019 19:02:09 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Marek Vasut <marex@...x.de>
Cc:     Andrew Lunn <andrew@...n.ch>, netdev@...r.kernel.org,
        "David S . Miller" <davem@...emloft.net>,
        Nisar Sayed <Nisar.Sayed@...rochip.com>,
        Woojung Huh <Woojung.Huh@...rochip.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH 10/19] usbnet: smsc95xx: Replace smsc95xx_mdio_read() with
 phy_read()

On 04.01.2019 16:57, Andrew Lunn wrote:
>> I wonder, if I use the phylib functions instead of the ad-hoc ones in
>> the MAC driver, is there still a problem with synchronization ?
> 
> You would need to look deep into phylib. When does it reset the PHY?
> Configure auto-neg, setup interrupts, etc? It looks like both are
> going to do this, so i expect they are going to mess each other up.
> 
Marek, I recently went through this exercise when switching r8169
driver to phylib. As Andrew explained:
First add needed functionality to the respective PHY driver(s),
then you can switch the network driver.
You can look at f1e911d5d0df ("r8169: add basic phylib support")
plus related changes, and to what was added to the Realtek PHY
driver module.