Re: [PATCH net-next v2 1/2] net: phy: realtek: use C45 for RTL8365MB-VC internal PHY MMD access

On Thu, Sep 3, 2026 at 11:22 AM Oleksij Rempel [off-list ref] wrote:

The RTL8365MB-VC PHYs are integrated into the switch and have no MMD
registers of their own. What phylib accesses as MMD registers (EEE)
actually lives in the switch's OCP registers; the realtek DSA driver maps
those MMD requests onto OCP and exposes them over C45.

For a C22 PHY, phy_read_mmd()/phy_write_mmd() would use C22 indirect-MMD,
which this hardware does not implement. Point .read_mmd/.write_mmd at
genphy_{read,write}_mmd_c45() so phylib's MMD accesses go over C45 to the
DSA driver's mapping instead.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>

Reviewed-by: Linus Walleij <linusw@kernel.org>

Yours,
Linus Walleij