netdev - Re: [PATCH v3 1/3] dt-bindings: net: marvell,pp2: convert to json-schema

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Message-ID: <6f3088a8-284d-d71f-68d1-01a5412bfff2@linaro.org>
Date:   Wed, 12 Oct 2022 10:32:07 -0400
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Marcin Wojtas <mw@...ihalf.com>
Cc:     Michał Grzelak <mig@...ihalf.com>,
        devicetree@...r.kernel.org, linux@...linux.org.uk,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, upstream@...ihalf.com
Subject: Re: [PATCH v3 1/3] dt-bindings: net: marvell,pp2: convert to
 json-schema

On 11/10/2022 16:34, Marcin Wojtas wrote:
>>
>> Keep the same order of items here as in list of properties
>>
>>> +
>>> +required:
>>> +  - compatible
>>> +  - reg
>>> +  - clocks
>>> +  - clock-names
>>> +
>>> +allOf:
>>> +  - $ref: ethernet-controller.yaml#
>>
>> Hmm, are you sure this applies to top-level properties, not to
>> ethernet-port subnodes? Your ports have phy-mode and phy - just like
>> ethernet-controller. If I understand correctly, your Armada Ethernet
>> Controller actually consists of multiple ethernet controllers?
>>
> 
> PP2 is a single controller with common HW blocks, such as queue/buffer
> management, parser/classifier, register space, and more. It controls
> up to 3 MAC's (ports) that can be connected to phys, sfp cages, etc.
> The latter cannot exist on their own and IMO the current hierarchy -
> the main controller with subnodes (ports) properly reflects the
> hardware.
> 
> Anyway, the ethernet-controller.yaml properties fit to the subnodes.
> Apart from the name. The below is IMO a good description:.

It also starts to look a bit like a switch (see bindings/net/dsa).

> 
>> If so, this should be moved to proper place inside patternProperties.
>> Maybe the subnodes should also be renamed from ports to just "ethernet"
>> (as ethernet-controller.yaml expects), but other schemas do not follow
>> this convention,
> 
> ethernet@
> {
>     ethernet-port@0
>     {
>      }
>      ethernet-port@1
>      {
>      }
> }
> 
> What do you recommend?

Yes, keep it like this and reference the ethernet-controller.yaml in
each port.

Best regards,
Krzysztof