linux-kernel - Re: [PATCH net-next 09/12] ARM: dts: r9a06g032: describe MII converter

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Message-ID: <20220415184541.0a6928f5@fixe.home>
Date:   Fri, 15 Apr 2022 18:45:41 +0200
From:   Clément Léger <clement.leger@...tlin.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Herve Codina <herve.codina@...tlin.com>,
        Miquèl Raynal <miquel.raynal@...tlin.com>,
        Milan Stevanovic <milan.stevanovic@...com>,
        Jimmy Lalande <jimmy.lalande@...com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 09/12] ARM: dts: r9a06g032: describe MII
 converter

Le Fri, 15 Apr 2022 18:19:46 +0200,
Andrew Lunn <andrew@...n.ch> a écrit :

> > I think it would be good to modify it like this:
> > 
> > eth-miic@...30000 {
> >     ...
> >   converters {
> >     mii_conv0: mii-conv@0 {
> >       // Even if useless, maybe keeping it for the sake of coherency
> >       renesas,miic-input = <MIIC_GMAC1>;
> >       reg = <0>;
> >     };  
> 
> This is not a 'bus', so using reg, and @0, etc is i think wrong.  You
> just have a collection of properties.

Agreed, but this is the same thing that is done for DSA ports (at least
I think). It uses reg which describe the port number, this is not a
real bus per se, it only refer to port indices.

But if you think this should not be done like this, what do you propose
then ? These nodes are also reference from "pcs-handle" properties in
switch to retrieve the PCS. Would you suggest using something like
pcs-handle = <&eth_miic port_index> and remove the nodes then ?

Thanks,


-- 
Clément Léger,
Embedded Linux and Kernel engineer at Bootlin
https://bootlin.com