netdev - Re: [RFC v8 net-next 00/16] add support for VSC7512 control over SPI

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Message-ID: <20220514220010.GB3629122@euler>
Date:   Sat, 14 May 2022 15:00:10 -0700
From:   Colin Foster <colin.foster@...advantage.com>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Terry Bowman <terry.bowman@....com>,
        Wolfram Sang <wsa@...nel.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Steen Hegelund <Steen.Hegelund@...rochip.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Russell King <linux@...linux.org.uk>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Lee Jones <lee.jones@...aro.org>
Subject: Re: [RFC v8 net-next 00/16] add support for VSC7512 control over SPI

On Mon, May 09, 2022 at 05:13:05PM +0000, Vladimir Oltean wrote:
> Hi Colin,
> 
> On Sun, May 08, 2022 at 11:52:57AM -0700, Colin Foster wrote:
> > 
> > 		mdio0: mdio0@0 {
> 
> This is going to be interesting. Some drivers with multiple MDIO buses
> create an "mdios" container with #address-cells = <1> and put the MDIO
> bus nodes under that. Others create an "mdio" node and an "mdio0" node
> (and no address for either of them).
> 
> The problem with the latter approach is that
> Documentation/devicetree/bindings/net/mdio.yaml does not accept the
> "mdio0"/"mdio1" node name for an MDIO bus.

I'm starting this implementation. Yep - it is interesting.

A quick grep for "mdios" only shows one hit:
arch/arm64/boot/dts/freescale/fsl-lx2160a-bluebox3.dts

While that has an mdios field (two, actually), each only has one mdio
bus, and they all seem to get parsed / registered through
sja1105_mdiobus_.*_register.


Is this change correct (I have a feeling it isn't):

ocelot-chip@0 {
    #address-cells = <1>;
    #size-cells = <0>;

    ...

    mdio0: mdio@0 {
        reg=<0>;
        ...
    };

    mdio1: mdio@1 {
        reg = <1>;
        ...
    };
    ...
};

When I run this with MFD's (use,)of_reg, things work as I'd expect. But
I don't directly have the option to use an "mdios" container here
because MFD runs "for_each_child_of_node" doesn't dig into
mdios->mdio0...

> 
> > 			compatible = "mscc,ocelot-miim";
> > 			#address-cells = <1>;
> > 			#size-cells = <0>;
> > 
> > 			sw_phy0: ethernet-phy@0 {
> > 				reg = <0x0>;
> > 			};
> > 
> > 			sw_phy1: ethernet-phy@1 {
> > 				reg = <0x1>;
> > 			};
> > 
> > 			sw_phy2: ethernet-phy@2 {
> > 				reg = <0x2>;
> > 			};
> > 
> > 			sw_phy3: ethernet-phy@3 {
> > 				reg = <0x3>;
> > 			};
> > 		};
> > 
> > 		mdio1: mdio1@1 {
> > 			compatible = "mscc,ocelot-miim";
> > 			pinctrl-names = "default";
> > 			pinctrl-0 = <&miim1>;
> > 			#address-cells = <1>;
> > 			#size-cells = <0>;
> > 
> > 			sw_phy4: ethernet-phy@4 {
> > 				reg = <0x4>;
> > 			};
> > 
> > 			sw_phy5: ethernet-phy@5 {
> > 				reg = <0x5>;
> > 			};
> > 
> > 			sw_phy6: ethernet-phy@6 {
> > 				reg = <0x6>;
> > 			};
> > 
> > 			sw_phy7: ethernet-phy@7 {
> > 				reg = <0x7>;
> > 			};
> > 		};
> >