Re: [PATCH net-next v13 09/11] net: mdio: realtek-rtl9300: Add support for RTL838x

[Andrew Lunn <andrew@lunn.ch>]

On Fri, Aug 07, 2026 at 07:10:56PM +0200, Markus Stockhausen wrote:
> The MDIO driver has been prepared for multiple device support. Add all
> required bits for the RTL838x (aka maple) series. This is straightforward
> but some things are worth mentioning.
> 
> - The device has a lot in common with the RTL930x series. It has 28 ports,
>   4096 (Realtek) pages and 4 MMIO registers. With this a lot of the
>   existing RTL9300 defines could be reused. But to avoid confusion and
>   for better readability duplicate the defines with a proper prefix.
> - The MDIO engine has no fail bit. Thus the mask is set to zero.
> - There is only one SMI bus for 1G PHYs. No bus_map_base register exists.
> - The setup_controller() function needs no C45 setup but must activate
>   the PHY access.
> 
> As per the SDK the PHYs on a RTl83xx bus are mainly C22 driven. The
> polling unit works in C22 mode and the devicetree usually does not
> make use of the ethernet-phy-ieee802.3-c45 flag. Nevertheless there are
> some PHY MMD registers (e.g. EEE) that might be of interest for the
> future development of the hardware. Until that is really needed keep
> the C45 read/write helpers out of the driver.
> 
> Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew