netdev - Re: [RFC PATCH net-next 1/9] dt-bindings: net: dsa: convert ksz bindings document to yaml

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Date:   Thu, 22 Oct 2020 15:37:35 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Kurt Kanzenbach <kurt.kanzenbach@...utronix.de>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Christian Eggers <ceggers@...i.de>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Helmut Grohne <helmut.grohne@...enta.de>,
        Paul Barker <pbarker@...sulko.com>,
        Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>,
        George McCollister <george.mccollister@...il.com>,
        Marek Vasut <marex@...x.de>,
        Tristram Ha <Tristram.Ha@...rochip.com>,
        "David S . Miller" <davem@...emloft.net>,
        Woojung Huh <woojung.huh@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH net-next 1/9] dt-bindings: net: dsa: convert ksz
 bindings document to yaml

On Thu, Oct 22, 2020 at 12:54:52PM +0200, Kurt Kanzenbach wrote:
> On Wed Oct 21 2020, Florian Fainelli wrote:
> > On 10/21/2020 5:16 PM, Vladimir Oltean wrote:
> >> On Wed, Oct 21, 2020 at 08:52:01AM +0200, Kurt Kanzenbach wrote:
> >>> On Mon Oct 19 2020, Christian Eggers wrote:
> >>> The node names should be switch. See dsa.yaml.
> >>>
> >>>> +            compatible = "microchip,ksz9477";
> >>>> +            reg = <0>;
> >>>> +            reset-gpios = <&gpio5 0 GPIO_ACTIVE_LOW>;
> >>>> +
> >>>> +            spi-max-frequency = <44000000>;
> >>>> +            spi-cpha;
> >>>> +            spi-cpol;
> >>>> +
> >>>> +            ports {
> >>>
> >>> ethernet-ports are preferred.
> >> 
> >> This is backwards to me, instead of an 'ethernet-switch' with 'ports',
> >> we have a 'switch' with 'ethernet-ports'. Whatever.
> >
> > The rationale AFAIR was that dual Ethernet port controllers like TI's 
> > CPSW needed to describe each port as a pseudo Ethernet MAC and using 
> > 'ethernet-ports' as a contained allowed to disambiguate with the 'ports' 
> > container used in display subsystem descriptions.
> 
> Yes, that was the outcome of previous discussions.

And why would that disambiguation be necessary in the first place? My
understanding is that the whole node path provides the necessary
namespacing to avoid the confusion. For example, the 'reg' property
means 100 things to 100 buses, and no one has an issue with that. I am
not expecting an Ethernet switch to have an HDMI port, I might be wrong
though.