linux-kernel - Re: [PATCH v2] dt-bindings: net: marvell,pp2: convert to json-schema

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Date:   Mon,  3 Oct 2022 19:06:13 +0200
From:   Michał Grzelak <mig@...ihalf.com>
To:     mw@...ihalf.com
Cc:     davem@...emloft.net, devicetree@...r.kernel.org,
        edumazet@...gle.com, krzysztof.kozlowski+dt@...aro.org,
        krzysztof.kozlowski@...aro.org, kuba@...nel.org,
        linux-kernel@...r.kernel.org, linux@...linux.org.uk,
        mig@...ihalf.com, netdev@...r.kernel.org, pabeni@...hat.com,
        robh+dt@...nel.org, upstream@...ihalf.com
Subject: Re: [PATCH v2] dt-bindings: net: marvell,pp2: convert to json-schema

On 02/10/2022 10:23, Marcin Wojtas wrote:
>niedz., 2 paź 2022 o 10:00 Krzysztof Kozlowski
><krzysztof.kozlowski@...aro.org> napisał(a):
>>
>> On 01/10/2022 17:53, Michał Grzelak wrote:
>> > Hi Krzysztof,
>> >
>> > Thanks for your comments and time spent on reviewing my patch.
>> > All of those improvements will be included in next version.
>> > Also, I would like to know your opinion about one.
>> >
>> >>> +
>> >>> +  marvell,system-controller:
>> >>> +    $ref: /schemas/types.yaml#/definitions/phandle
>> >>> +    description: a phandle to the system controller.
>> >>> +
>> >>> +patternProperties:
>> >>> +  '^eth[0-9a-f]*(@.*)?$':
>> >>
>> >> The name should be "(ethernet-)?port", unless anything depends on
>> >> particular naming?
>> >
>> > What do you think about pattern "^(ethernet-)?eth[0-9a-f]+(@.*)?$"?
>> > It resembles pattern found in net/ethernet-phy.yaml like
>> > properties:$nodename:pattern:"^ethernet-phy(@[a-f0-9]+)?$", while
>> > still passing `dt_binding_check' and `dtbs_check'. It should also
>> > comply with your comment.
>>
>> Node names like ethernet-eth do not make much sense because they contain
>> redundant ethernet or eth. AFAIK, all other bindings like that call
>> these ethernet-ports (or sometimes shorter - ports). Unless this device
>> is different than all others?
>>
>
>IMO "^(ethernet-)?port@[0-9]+$" for the subnodes' names could be fine
>(as long as we don't have to modify the existing .dtsi files) - there
>is no dependency in the driver code on that.

Indeed, driver's code isn't dependent; however, there is a dependency
on 'eth[0-2]' name in all relevant .dts and .dtsi files, e.g.:

https://github.com/torvalds/linux/blob/master/arch/arm/boot/dts/armada-375.dtsi#L190
https://github.com/torvalds/linux/blob/master/arch/arm64/boot/dts/marvell/armada-cp11x.dtsi#L72

Ports under 'ethernet' node are named eth[0-2], thus those and all .dts files 
including the above would have to be modified to pass through `dtbs_check'.

Best regards,
Michał