linux-kernel - Re: Re: [PATCH v3 1/6] dt-bindings: net: dsa: convert binding for mediatek switches

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Message-ID: <20220518015459.GB2049643-robh@kernel.org>
Date:   Tue, 17 May 2022 20:54:59 -0500
From:   Rob Herring <robh@...nel.org>
To:     Frank Wunderlich <frank-w@...lic-files.de>
Cc:     Frank Wunderlich <linux@...web.de>,
        linux-rockchip@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Peter Geis <pgwipeout@...il.com>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Greg Ungerer <gerg@...nel.org>,
        René van Dorst <opensource@...rst.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Subject: Re: Re: [PATCH v3 1/6] dt-bindings: net: dsa: convert binding for
 mediatek switches

On Wed, May 11, 2022 at 10:02:45AM +0200, Frank Wunderlich wrote:
> Hi
> 
> thanks for review
> 
> > Gesendet: Dienstag, 10. Mai 2022 um 20:44 Uhr
> > Von: "Rob Herring" <robh@...nel.org>
> > On Sat, May 07, 2022 at 07:04:35PM +0200, Frank Wunderlich wrote:
> > > From: Frank Wunderlich <frank-w@...lic-files.de>
> 
> > > +++ b/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml
> 
> > > +properties:
> > > +  compatible:
> > > +    enum:
> > > +      - mediatek,mt7530
> > > +      - mediatek,mt7531
> > > +      - mediatek,mt7621
> > > +
> >
> > > +  "#address-cells":
> > > +    const: 1
> > > +
> > > +  "#size-cells":
> > > +    const: 0
> >
> > I don't see any child nodes with addresses, so these can be removed.
> 
> dropping this (and address-cells/size-cells from examples) causes errors like this (address-/size-cells set in mdio
> node, so imho it should inherite):

I think you are off a level.


> Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.example.dts:34.25-35: Warning (reg_format):
> /example-0/mdio/switch@...orts/port@0:reg: property has invalid length (4 bytes) (#address-cells == 2, #size-cells == 1)

That's for yet another level where 'ports' node need the properties.

> Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.example.dtb: Warning (pci_device_reg): Failed prerequisite 'reg_format'
> 
> > > +  interrupt-controller:
> > > +    type: boolean
> >
> > Already has a type. Just:
> >
> > interrupt-controller: true
> >
> > > +
> > > +  interrupts:
> > > +    maxItems: 1
> 
> > > +patternProperties:
> > > +  "^(ethernet-)?ports$":
> > > +    type: object
> >
> >        additionalProperties: false
> 
> imho this will block address-/size-cells from this level too. looks like it is needed here too (for port-regs).
> 
> > > +
> > > +    patternProperties:
> > > +      "^(ethernet-)?port@[0-9]+$":
> > > +        type: object
> > > +        description: Ethernet switch ports
> > > +
> > > +        unevaluatedProperties: false
> > > +
> > > +        properties:
> > > +          reg:
> > > +            description:
> > > +              Port address described must be 5 or 6 for CPU port and from 0
> > > +              to 5 for user ports.
> > > +
> > > +        allOf:
> > > +          - $ref: dsa-port.yaml#
> > > +          - if:
> > > +              properties:
> > > +                label:
> > > +                  items:
> > > +                    - const: cpu
> > > +            then:
> > > +              required:
> > > +                - reg
> > > +                - phy-mode
> > > +
> 
> > > +  - if:
> > > +      required:
> > > +        - interrupt-controller
> > > +    then:
> > > +      required:
> > > +        - interrupts
> >
> > This can be expressed as:
> >
> > dependencies:
> >   interrupt-controller: [ interrupts ]
> 
> ok, i will change this
> 
> > > +            ports {
> >
> > Use the preferred form: ethernet-ports
> 
> current implementation in all existing dts and examples from old binding are "ports" only.
> should they changed too?

They don't have to be the schema allows both, but the example should be 
best practice.

Rob