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Date:   Wed, 20 Apr 2022 15:25:39 +0200
From:   Geert Uytterhoeven <>
To:     Clément Léger <>
Cc:     Andrew Lunn <>,
        Vivien Didelot <>,
        Florian Fainelli <>,
        Vladimir Oltean <>,
        "David S . Miller" <>,
        Jakub Kicinski <>,
        Paolo Abeni <>,
        Rob Herring <>,
        Krzysztof Kozlowski <>,
        Geert Uytterhoeven <>,
        Magnus Damm <>,
        Heiner Kallweit <>,
        Russell King <>,
        Thomas Petazzoni <>,
        Herve Codina <>,
        Miquèl Raynal <>,
        Milan Stevanovic <>,
        Jimmy Lalande <>,
        Linux Kernel Mailing List <>,
        Linux-Renesas <>,
        netdev <>
Subject: Re: [PATCH net-next 04/12] net: pcs: add Renesas MII converter driver

Hi Clément,

Thanks for your patch!
Only cosmetic comments from me, as I'm not too familiar with MII.

On Thu, Apr 14, 2022 at 2:24 PM Clément Léger <> wrote:
> Add PCS driver for the MII converter that is present on Renesas RZ/N1

Add a ... on the ...

> SoC. This MII converter is reponsible of converting MII to RMII/RGMII

responsible for

> or act as a MII passtrough. Exposing it as a PCS allows to reuse it


> in both the switch driver and the stmmac driver. Currently, this driver
> only allows the PCS to be used by the dual Cortex-A7 subsystem since
> the register locking system is not used.
> Signed-off-by: Clément Léger <>

> --- a/drivers/net/pcs/Kconfig
> +++ b/drivers/net/pcs/Kconfig
> @@ -18,4 +18,11 @@ config PCS_LYNX
>           This module provides helpers to phylink for managing the Lynx PCS
>           which is part of the Layerscape and QorIQ Ethernet SERDES.
> +config PCS_RZN1_MIIC
> +       tristate "Renesas RZN1 MII converter"


> +       help
> +         This module provides a driver for the MII converter that is available
> +         on RZN1 SoC. This PCS convert MII to RMII/RGMII or can be in


> +         passthrough mode for MII.
> +
>  endmenu



Geert Uytterhoeven -- There's lots of Linux beyond ia32 --

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

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