powerpc/fsl: Update fman dt binding with pcs-phy and tbi-phy

The FMan contains internal PHY devices used for SGMII connections
to external PHYs. When these PHYs are in use a reference is needed
for both the external PHY and the internal one. For the external
PHY phy-handle provides the reference. For the internal PHY a new
handle is required.
In dTSEC, the internal PHY is a TBI (Ten Bit Interface) PHY,
the handle used will be tbi-handle.
In mEMAC, the internal PHY is a PCS (Physical Coding Sublayer) PHY,
the handle used will be pcsphy-handle.

Signed-off-by: Igal Liberman <[e-mail]>
Signed-off-by: Scott Wood <[e-mail]>

Documentation/devicetree/bindings/powerpc/fsl/fman.txt

···
 		Value type: <phandle>
 		Definition: A phandle for 1EEE1588 timer.
 
+- pcsphy-handle
+		Usage required for "fsl,fman-memac" MACs
+		Value type: <phandle>
+		Definition: A phandle for pcsphy.
+
+- tbi-handle
+		Usage required for "fsl,fman-dtsec" MACs
+		Value type: <phandle>
+		Definition: A phandle for tbiphy.
+
 EXAMPLE
 
 fman1_tx28: port@a8000 {
···
 	reg = <0xe0000 0x1000>;
 	fsl,fman-ports = <&fman1_rx8 &fman1_tx28>;
 	ptp-timer = <&ptp-timer>;
+	tbi-handle = <&tbi0>;
 };
 
 ============================================================================
···
 		The settings and programming routines for internal/external
 		MDIO are different. Must be included for internal MDIO.
 
+For internal PHY device on internal mdio bus, a PHY node should be created.
+See the definition of the PHY node in booting-without-of.txt for an
+example of how to define a PHY (Internal PHY has no interrupt line).
+- For "fsl,fman-mdio" compatible internal mdio bus, the PHY is TBI PHY.
+- For "fsl,fman-memac-mdio" compatible internal mdio bus, the PHY is PCS PHY,
+  PCS PHY addr must be '0'.
+
 EXAMPLE
 
 Example for FMan v2 external MDIO:
···
 	interrupts = <101 2 0 0>;
 };
 
+Example for FMan v2 internal MDIO:
+
+mdio@e3120 {
+	compatible = "fsl,fman-mdio";
+	reg = <0xe3120 0xee0>;
+	fsl,fman-internal-mdio;
+
+	tbi1: tbi-phy@8 {
+		reg = <0x8>;
+		device_type = "tbi-phy";
+	};
+};
+
 Example for FMan v3 internal MDIO:
 
 mdio@f1000 {
 	compatible = "fsl,fman-memac-mdio";
 	reg = <0xf1000 0x1000>;
 	fsl,fman-internal-mdio;
+
+	pcsphy6: ethernet-phy@0 {
+		reg = <0x0>;
+	};
 };
 
 =============================================================================
···
 		cell-index = <0>;
 		reg = <0xe0000 0x1000>;
 		fsl,fman-ports = <&fman1_rx_0x8 &fman1_tx_0x28>;
+		tbi-handle = <&tbi5>;
 	};
 
 	ethernet@e2000 {
···
 		cell-index = <1>;
 		reg = <0xe2000 0x1000>;
 		fsl,fman-ports = <&fman1_rx_0x9 &fman1_tx_0x29>;
+		tbi-handle = <&tbi6>;
 	};
 
 	ethernet@e4000 {
···
 		cell-index = <2>;
 		reg = <0xe4000 0x1000>;
 		fsl,fman-ports = <&fman1_rx_0xa &fman1_tx_0x2a>;
+		tbi-handle = <&tbi7>;
 	};
 
 	ethernet@e6000 {
···
 		cell-index = <3>;
 		reg = <0xe6000 0x1000>;
 		fsl,fman-ports = <&fman1_rx_0xb &fman1_tx_0x2b>;
+		tbi-handle = <&tbi8>;
 	};
 
 	ethernet@e8000 {
···
 		cell-index = <4>;
 		reg = <0xf0000 0x1000>;
 		fsl,fman-ports = <&fman1_rx_0xc &fman1_tx_0x2c>;
+		tbi-handle = <&tbi9>;
 
 	ethernet@f0000 {
 		cell-index = <8>;