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

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Date:   Mon, 3 Oct 2022 19:23:28 +0200
From:   Marcin Wojtas <mw@...ihalf.com>
To:     Michał Grzelak <mig@...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,
        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

pon., 3 paź 2022 o 19:06 Michał Grzelak <mig@...ihalf.com> napisał(a):
>
> 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'.
>

Can you please double check?
The .dts files use labels, the node name they relate to should be irrelevant:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/boot/dts/marvell/cn9130-db.dtsi?h=v6.0#n122
(BTW, for A7k8k/CN913x example please use updated names, i.e.
s/cpm_/cp0_/ and s/cps_/cp1_/)
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm/boot/dts/armada-375-db.dts?h=v6.0#n167

Best regards,
Marcin