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@xxxxxxxx>
> ---
>
> 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@xxxxxxxxxx>
