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Date: Fri, 30 Sep 2022 09:37:56 -0500
From: Rob Herring <robh@kernel.org>
To: Sean Anderson <sean.anderson@seco.com>
Subject: Re: [PATCH net-next v5 2/9] dt-bindings: net: Add Lynx PCS binding
Message-ID: <166454867358.281536.13914577954285422823.robh@kernel.org>
References: <20220926190322.2889342-1-sean.anderson@seco.com>
 <20220926190322.2889342-3-sean.anderson@seco.com>
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Cc: devicetree@vger.kernel.org, Madalin Bucur <madalin.bucur@nxp.com>, netdev@vger.kernel.org, Russell King <linux@armlinux.org.uk>, linux-kernel@vger.kernel.org, Eric Dumazet <edumazet@google.com>, Rob Herring <robh+dt@kernel.org>, Camelia Alexandra Groza <camelia.groza@nxp.com>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>, Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>, "linuxppc-dev @ lists . ozlabs . org" <linuxppc-dev@lists.ozlabs.org>, "David S . Miller" <davem@davemloft.net>, linux-arm-kernel@lists.infradead.org
Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org
Sender: "Linuxppc-dev" <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

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@seco.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@kernel.org>