linux-kernel - 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 12:54:52 +0200
From:   Kurt Kanzenbach <kurt.kanzenbach@...utronix.de>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>
Cc:     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 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.

> We should probably enforce or recommend 'ethernet-switch' to be used
> as the node name for Ethernet switch devices though.

After using grep, it seems like 'ethernet-switch' as well as simply
'switch' are being used today. Yes, maybe both should be allowed.

Thanks,
Kurt

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