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Date:   Wed, 3 Nov 2021 01:27:31 +0100
From:   Andrew Lunn <andrew@lunn.ch>
To:     Grygorii Strashko <grygorii.strashko@ti.com>
Cc:     "Russell King (Oracle)" <linux@armlinux.org.uk>,
        "David S. Miller" <davem@davemloft.net>, netdev@vger.kernel.org,
        Jakub Kicinski <kuba@kernel.org>,
        Heiner Kallweit <hkallweit1@gmail.com>,
        Florian Fainelli <f.fainelli@gmail.com>,
        linux-kernel@vger.kernel.org, Vignesh Raghavendra <vigneshr@ti.com>
Subject: Re: [RFC PATCH] net: phy/mdio: enable mmd indirect access through
 phy_mii_ioctl()
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> > What i find interesting is that you and the other resent requester are
> > using the same user space tool. If you implement C45 over C22 in that
> > tool, you get your solution, and it will work for older kernels as
> > well. Also, given the diverse implementations of this IOTCL, it
> > probably works for more drivers than just those using phy_mii_ioctl().
> 
> Do you mean change uapi, like
>  add mdio_phy_id_is_c45_over_c22() and
>  flag #define MDIO_PHY_ID_C45_OVER_C22 0x4000?

No, i mean user space implements C45 over C22. Make phytool write
MII_MMD_CTRL and MII_MMD_DATA to perform a C45 over C22.

	     Andrew