netdev - Re: [PATCH net-next v3 2/8] dt-bindings: phy: add the "fsl,lynx-28g" compatible

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Message-ID: <20220310173223.pl2asv55iqfmbasq@skbuf>
Date:   Thu, 10 Mar 2022 17:32:24 +0000
From:   Ioana Ciornei <ioana.ciornei@....com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "kishon@...com" <kishon@...com>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        Leo Li <leoyang.li@....com>,
        "linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        Hongxing Zhu <hongxing.zhu@....com>
Subject: Re: [PATCH net-next v3 2/8] dt-bindings: phy: add the "fsl,lynx-28g"
 compatible

On Thu, Mar 10, 2022 at 05:47:31PM +0100, Krzysztof Kozlowski wrote:
> On 10/03/2022 15:51, Ioana Ciornei wrote:
> > Describe the "fsl,lynx-28g" compatible used by the Lynx 28G SerDes PHY
> > driver on Layerscape based SoCs.
> 
> The message is a bit misleading, because it suggests you add only
> compatible to existing bindings. Instead please look at the git log how
> people usually describe it in subject and message.

Sure, I can change the title and commit message.

> > +patternProperties:
> > +  '^phy@[0-9a-f]$':
> > +    type: object
> > +    properties:
> > +      reg:
> > +        description:
> > +          Number of the SerDes lane.
> > +        minimum: 0
> > +        maximum: 7
> > +
> > +      "#phy-cells":
> > +        const: 0
> 
> Why do you need all these children? You just enumerated them, without
> statuses, resources or any properties. This should be rather just index
> of lynx-28g phy.

I am just describing each lane of the SerDes block so that each ethernet
dts node references it directly.

Since I am new to the generic PHY infrastructure I was using the COMPHY
for the Marvell MVEBU SoCs (phy-mvebu-comphy.txt) as a loose example.
Each lane there is described as a different child node as well. The only
difference from the COMPHY is that Lynx 28G does not need #phy-cells =
<1> to reference the input port, we just use '#phy-cells = <0>' on each
lane.

What is wrong with this approach? Or better, is there an easier way to
do this?

> 
> > +
> > +    additionalProperties: false
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    soc {
> > +      #address-cells = <2>;
> > +      #size-cells = <2>;
> > +      serdes_1: serdes_phy@...0000 {
> 
> node name just "phy"

Sure.

Ioana