[RFC PATCH net-next v3 4/8] dt-bindings: net: pcs: add bindings for MediaTek USXGMII PCS

[Conor Dooley]

On Tue, Dec 12, 2023 at 03:47:31AM +0000, Daniel Golle wrote:
> MediaTek's USXGMII can be found in the MT7988 SoC. We need to access
> it in order to configure and monitor the Ethernet SerDes link in
> USXGMII, 10GBase-R and 5GBase-R mode. By including a wrapped
> legacy 1000Base-X/2500Base-X/Cisco SGMII LynxI PCS as well, those
> interface modes are also available.
> 
> Signed-off-by: Daniel Golle <daniel at makrotopia.org>
> ---
>  .../bindings/net/pcs/mediatek,usxgmii.yaml    | 60 +++++++++++++++++++
>  1 file changed, 60 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/net/pcs/mediatek,usxgmii.yaml
> 
> diff --git a/Documentation/devicetree/bindings/net/pcs/mediatek,usxgmii.yaml b/Documentation/devicetree/bindings/net/pcs/mediatek,usxgmii.yaml
> new file mode 100644
> index 0000000000000..0cdaa3545edb0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/pcs/mediatek,usxgmii.yaml
> @@ -0,0 +1,60 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/pcs/mediatek,usxgmii.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MediaTek USXGMII PCS
> +
> +maintainers:
> +  - Daniel Golle <daniel at makrotopia.org>
> +
> +description:
> +  The MediaTek USXGMII PCS provides physical link control and status
> +  for USXGMII, 10GBase-R and 5GBase-R links on the SerDes interfaces
> +  provided by the PEXTP PHY.
> +  In order to also support legacy 2500Base-X, 1000Base-X and Cisco
> +  SGMII an existing mediatek,*-sgmiisys LynxI PCS is wrapped to
> +  provide those interfaces modes on the same SerDes interfaces shared
> +  with the USXGMII PCS.
> +
> +properties:
> +  $nodename:
> +    pattern: "^pcs@[0-9a-f]+$"
> +
> +  compatible:
> +    const: mediatek,mt7988-usxgmiisys
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: USXGMII top-level clock
> +
> +  resets:
> +    items:
> +      - description: XFI reset

For this two, why not just "maxItems: 1", since there are only one of
each?

> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - resets
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/mediatek,mt7988-clk.h>

> +    #define MT7988_TOPRGU_XFI0_GRST 12

Why? You can just put the raw numbers here and avoid the issues with the
bot being unable to test your series.

> +    soc {
> +      #address-cells = <2>;
> +      #size-cells = <2>;
> +        usxgmiisys0: pcs at 10080000 {
> +          compatible = "mediatek,mt7988-usxgmiisys";
> +          reg = <0 0x10080000 0 0x1000>;
> +          clocks = <&topckgen CLK_TOP_USXGMII_SBUS_0_SEL>;
> +          resets = <&watchdog MT7988_TOPRGU_XFI0_GRST>;
> +        };
> +    };
> -- 
> 2.43.0
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