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

From: "Clément Léger" <clement.leger@bootlin.com>
To: Andrew Lunn <andrew@lunn.ch>
Cc: "Vivien Didelot" <vivien.didelot@gmail.com>,
	"Florian Fainelli" <f.fainelli@gmail.com>,
	"Vladimir Oltean" <olteanv@gmail.com>,
	"David S . Miller" <davem@davemloft.net>,
	"Jakub Kicinski" <kuba@kernel.org>,
	"Paolo Abeni" <pabeni@redhat.com>,
	"Rob Herring" <robh+dt@kernel.org>,
	"Krzysztof Kozlowski" <krzk+dt@kernel.org>,
	"Geert Uytterhoeven" <geert+renesas@glider.be>,
	"Magnus Damm" <magnus.damm@gmail.com>,
	"Heiner Kallweit" <hkallweit1@gmail.com>,
	"Russell King" <linux@armlinux.org.uk>,
	"Thomas Petazzoni" <thomas.petazzoni@bootlin.com>,
	"Herve Codina" <herve.codina@bootlin.com>,
	"Miquèl Raynal" <miquel.raynal@bootlin.com>,
	"Milan Stevanovic" <milan.stevanovic@se.com>,
	"Jimmy Lalande" <jimmy.lalande@se.com>,
	linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
	linux-renesas-soc@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH net-next 09/12] ARM: dts: r9a06g032: describe MII converter
Date: Fri, 15 Apr 2022 18:45:41 +0200	[thread overview]
Message-ID: <20220415184541.0a6928f5@fixe.home> (raw)
In-Reply-To: <YlmbIjoIZ8Xb4Kh/@lunn.ch>

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

> > I think it would be good to modify it like this:
> > 
> > eth-miic@44030000 {
> >     ...
> >   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