linux-kernel - Re: [PATCH net-next v5 2/9] dt-bindings: net: Add Lynx PCS binding

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Date:   Fri, 30 Sep 2022 09:37:56 -0500
From:   Rob Herring <robh@...nel.org>
To:     Sean Anderson <sean.anderson@...o.com>
Cc:     "linuxppc-dev @ lists . ozlabs . org" <linuxppc-dev@...ts.ozlabs.org>,
        linux-arm-kernel@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>, netdev@...r.kernel.org,
        Russell King <linux@...linux.org.uk>,
        devicetree@...r.kernel.org, Madalin Bucur <madalin.bucur@....com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-kernel@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Camelia Alexandra Groza <camelia.groza@....com>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net-next v5 2/9] dt-bindings: net: Add Lynx PCS binding

On Mon, 26 Sep 2022 15:03:14 -0400, Sean Anderson wrote:
> This binding is fairly bare-bones for now, since the Lynx driver doesn't
> parse any properties (or match based on the compatible). We just need it
> in order to prevent the PCS nodes from having phy devices attached to
> them. This is not really a problem, but it is a bit inefficient.
> 
> This binding is really for three separate PCSs (SGMII, QSGMII, and XFI).
> However, the driver treats all of them the same. This works because the
> SGMII and XFI devices typically use the same address, and the SerDes
> driver (or RCW) muxes between them. The QSGMII PCSs have the same
> register layout as the SGMII PCSs. To do things properly, we'd probably
> do something like
> 
> 	ethernet-pcs@0 {
> 		#pcs-cells = <1>;
> 		compatible = "fsl,lynx-pcs";
> 		reg = <0>, <1>, <2>, <3>;
> 	};
> 
> but that would add complexity, and we can describe the hardware just
> fine using separate PCSs for now.
> 
> Signed-off-by: Sean Anderson <sean.anderson@...o.com>
> ---
> 
> Changes in v5:
> - New
> 
>  .../bindings/net/pcs/fsl,lynx-pcs.yaml        | 40 +++++++++++++++++++
>  1 file changed, 40 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/net/pcs/fsl,lynx-pcs.yaml
> 

Reviewed-by: Rob Herring <robh@...nel.org>