linux-kernel - Re: [PATCH 1/6] dt-bindings: phy: ti: phy-gmii-sel: Add bindings for J721e

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Date:   Wed, 14 Sep 2022 11:15:27 -0500
From:   Rob Herring <robh@...nel.org>
To:     Siddharth Vadapalli <s-vadapalli@...com>
Cc:     lee.jones@...aro.org, krzysztof.kozlowski@...aro.org,
        krzysztof.kozlowski+dt@...aro.org, kishon@...com, vkoul@...nel.org,
        dan.carpenter@...cle.com, grygorii.strashko@...com,
        rogerq@...nel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, sjakhade@...ence.com
Subject: Re: [PATCH 1/6] dt-bindings: phy: ti: phy-gmii-sel: Add bindings for
 J721e

On Wed, Sep 14, 2022 at 03:09:06PM +0530, Siddharth Vadapalli wrote:
> TI's J721e SoC supports additional PHY modes like QSGMII and SGMII
> that are not supported on earlier SoCs. Add a compatible for it.
> 
> Extend ti,qsgmii-main-ports property to support selection of upto
> two main ports at once across the two QSGMII interfaces.
> 
> Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
> ---
>  .../bindings/phy/ti,phy-gmii-sel.yaml         | 52 ++++++++++++++++---
>  1 file changed, 46 insertions(+), 6 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/phy/ti,phy-gmii-sel.yaml b/Documentation/devicetree/bindings/phy/ti,phy-gmii-sel.yaml
> index da7cac537e15..1e19efab018b 100644
> --- a/Documentation/devicetree/bindings/phy/ti,phy-gmii-sel.yaml
> +++ b/Documentation/devicetree/bindings/phy/ti,phy-gmii-sel.yaml
> @@ -54,6 +54,7 @@ properties:
>        - ti,dm814-phy-gmii-sel
>        - ti,am654-phy-gmii-sel
>        - ti,j7200-cpsw5g-phy-gmii-sel
> +      - ti,j721e-cpsw9g-phy-gmii-sel
>  
>    reg:
>      maxItems: 1
> @@ -65,12 +66,19 @@ properties:
>      description: |
>        Required only for QSGMII mode. Array to select the port for
>        QSGMII main mode. Rest of the ports are selected as QSGMII_SUB
> -      ports automatically. Any one of the 4 CPSW5G ports can act as the
> -      main port with the rest of them being the QSGMII_SUB ports.
> -    maxItems: 1
> -    items:
> -      minimum: 1
> -      maximum: 4
> +      ports automatically. For J7200 CPSW5G with the compatible:
> +      ti,j7200-cpsw5g-phy-gmii-sel, ti,qsgmii-main-ports is an
> +      array of only one element, which is the port number ranging from
> +      1 to 4. For J721e CPSW9G with the compatible:
> +      ti,j721e-cpsw9g-phy-gmii-sel, ti,qsgmii-main-ports is an array
> +      of two elements, which corresponds to two potential QSGMII main
> +      ports. The first element and second element of the array can both
> +      range from 1 to 8 each, corresponding to two QSGMII main ports.
> +      For J721e CPSW9G, to configure port 2 as the first QSGMII main
> +      port and port 7 as the second QSGMII main port, we specify:
> +      ti,qsgmii-main-ports = <2>, <7>;
> +      If only one QSGMII main port is desired, mention the same main
> +      port twice.

Two different forms for the same property name is not great. Just make a 
new property if you need something different.

Rob