dt-bindings: net: freescale: enetc: Add connection bindings for ENETC ethernet nodes

Define connection bindings (external PHY connections and internal links)
for the ENETC on-chip ethernet controllers.

Signed-off-by: Claudiu Manoil <claudiu.manoil@nxp.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/devicetree/bindings/net/fsl-enetc.txt b/Documentation/devicetree/bindings/net/fsl-enetc.txt
new file mode 100644 (file)
index 0000000..c812e25
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+++ b/Documentation/devicetree/bindings/net/fsl-enetc.txt
@@ -0,0 +1,69 @@
+* 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:
+
+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 ethernet.txt or phy.txt, under
+Documentation/devicetree/bindings/net/*.
+
+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>;
+                       };
+               };
+       };
+
+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 "fixed-link.txt", under
+Documentation/devicetree/bindings/net/*.
+
+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;
+               };
+       };