netdev - Re: [PATCH net-next v3 1/4] dt-bindings: net: mscc,vsc7514-switch: convert txt bindings to yaml

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Date:   Fri, 26 Nov 2021 18:04:31 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Clément Léger <clement.leger@...tlin.com>
CC:     Julian Wiedmann <jwi@...ux.ibm.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        Andrew Lunn <andrew@...n.ch>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Denis Kirjanov <dkirjanov@...e.de>
Subject: Re: [PATCH net-next v3 1/4] dt-bindings: net: mscc,vsc7514-switch:
 convert txt bindings to yaml

On Fri, Nov 26, 2021 at 07:00:55PM +0100, Clément Léger wrote:
> Le Fri, 26 Nov 2021 17:50:05 +0000,
> Vladimir Oltean <vladimir.oltean@....com> a écrit :
> 
> > On Fri, Nov 26, 2021 at 06:27:36PM +0100, Clément Léger wrote:
> > > +  ethernet-ports:
> > > +    type: object
> > > +
> > > +    properties:
> > > +      '#address-cells':
> > > +        const: 1
> > > +      '#size-cells':
> > > +        const: 0
> > > +
> > > +    additionalProperties: false
> > > +
> > > +    patternProperties:
> > > +      "^port@[0-9a-f]+$":
> > > +        type: object
> > > +        description: Ethernet ports handled by the switch
> > > +
> > > +        $ref: ethernet-controller.yaml#
> > > +
> > > +        unevaluatedProperties: false
> > > +
> > > +        properties:
> > > +          reg:
> > > +            description: Switch port number
> > > +
> > > +          phy-handle: true
> > > +
> > > +          phy-mode: true
> > > +
> > > +          fixed-link: true
> > > +
> > > +          mac-address: true
> > > +
> > > +        required:
> > > +          - reg
> > > +
> > > +        oneOf:
> > > +          - required:
> > > +              - phy-handle
> > > +              - phy-mode
> > > +          - required:
> > > +              - fixed-link  
> > 
> > Are you practically saying that a phy-mode would not be required with
> > fixed-link? Because it still is...
> 
> I tried to get it right by looking at a binding you probably know
> (dsa.yaml), but none of them are using a oneOf property for these
> properties so I tried to guess what was really required or not. I will
> add the phy-mode property in the required field since it seems always
> needed:

So if it works without a phy-mode it is probably because of this in
ocelot_port_phylink_create():

	/* DT bindings of internal PHY ports are broken and don't
	 * specify a phy-mode
	 */
	if (phy_mode == PHY_INTERFACE_MODE_NA)
		phy_mode = PHY_INTERFACE_MODE_INTERNAL;

but yeah, remove that and try out a fixed-link with no phy-mode, see
that you'll get an error.

> 
> +        required:
> +          - reg
> +          - phy-mode
> +
> +        oneOf:
> +          - required:
> +              - phy-handle
> +          - required:
> +              - fixed-link  

Looks good to me.

> 
> Does it looks good to you ?
> 
> Thanks,
> 
> > 
> > > +
> > > +required:
> > > +  - compatible
> > > +  - reg
> > > +  - reg-names
> > > +  - interrupts
> > > +  - interrupt-names
> > > +  - ethernet-port  
> 
> 
> 
> -- 
> Clément Léger,
> Embedded Linux and Kernel engineer at Bootlin
> https://bootlin.com/