linux/Documentation/devicetree/bindings/net/fsl-enetc.txt
Claudiu Manoil 288a91d5cd dt-bindings: net: fsl: enetc: Add bindings for the central MDIO PCIe endpoint
The on-chip PCIe root complex that integrates the ENETC ethernet
controllers also integrates a PCIe endpoint for the MDIO controller
providing for centralized control of the ENETC mdio bus.
Add bindings for this "central" MDIO Integrated PCIe Endpoint.

Signed-off-by: Claudiu Manoil <claudiu.manoil@nxp.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-08-02 18:22:18 -07:00

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* ENETC ethernet device tree bindings
Depending on board design and ENETC port type (internal or
external) there are two supported link modes specified by
below device tree bindings.
Required properties:
- reg : Specifies PCIe Device Number and Function
Number of the ENETC endpoint device, according
to parent node bindings.
- compatible : Should be "fsl,enetc".
1. The ENETC external port is connected to a MDIO configurable phy
1.1. Using the local ENETC Port MDIO interface
In this case, the ENETC node should include a "mdio" sub-node
that in turn should contain the "ethernet-phy" node describing the
external phy. Below properties are required, their bindings
already defined in Documentation/devicetree/bindings/net/ethernet.txt or
Documentation/devicetree/bindings/net/phy.txt.
Required:
- phy-handle : Phandle to a PHY on the MDIO bus.
Defined in ethernet.txt.
- phy-connection-type : Defined in ethernet.txt.
- mdio : "mdio" node, defined in mdio.txt.
- ethernet-phy : "ethernet-phy" node, defined in phy.txt.
Example:
ethernet@0,0 {
compatible = "fsl,enetc";
reg = <0x000000 0 0 0 0>;
phy-handle = <&sgmii_phy0>;
phy-connection-type = "sgmii";
mdio {
#address-cells = <1>;
#size-cells = <0>;
sgmii_phy0: ethernet-phy@2 {
reg = <0x2>;
};
};
};
1.2. Using the central MDIO PCIe endpoint device
In this case, the mdio node should be defined as another PCIe
endpoint node, at the same level with the ENETC port nodes.
Required properties:
- reg : Specifies PCIe Device Number and Function
Number of the ENETC endpoint device, according
to parent node bindings.
- compatible : Should be "fsl,enetc-mdio".
The remaining required mdio bus properties are standard, their bindings
already defined in Documentation/devicetree/bindings/net/mdio.txt.
Example:
ethernet@0,0 {
compatible = "fsl,enetc";
reg = <0x000000 0 0 0 0>;
phy-handle = <&sgmii_phy0>;
phy-connection-type = "sgmii";
};
mdio@0,3 {
compatible = "fsl,enetc-mdio";
reg = <0x000300 0 0 0 0>;
#address-cells = <1>;
#size-cells = <0>;
sgmii_phy0: ethernet-phy@2 {
reg = <0x2>;
};
};
2. The ENETC port is an internal port or has a fixed-link external
connection
In this case, the ENETC port node defines a fixed link connection,
as specified by Documentation/devicetree/bindings/net/fixed-link.txt.
Required:
- fixed-link : "fixed-link" node, defined in "fixed-link.txt".
Example:
ethernet@0,2 {
compatible = "fsl,enetc";
reg = <0x000200 0 0 0 0>;
fixed-link {
speed = <1000>;
full-duplex;
};
};