Subject: Re: [RFC PATCH] net: phy/mdio: enable mmd indirect access through phy_mii_ioctl()

From: Andrew Lunn <[email-masked]>
Date: Wed, 3 Nov 2021 01:27:31 +0100

> > 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