Mediatek MT7530 Ethernet switch
================================
Required properties:
- compatible: may be compatible = "mediatek,mt7530"
or compatible = "mediatek,mt7621"
- #address-cells: Must be 1.
- #size-cells: Must be 0.
- mediatek,mcm: Boolean; if defined, indicates that either MT7530 is the part
on multi-chip module belong to MT7623A has or the remotely standalone
chip as the function MT7623N reference board provided for.
If compatible mediatek,mt7530 is set then the following properties are required
- core-supply: Phandle to the regulator node necessary for the core power.
- io-supply: Phandle to the regulator node necessary for the I/O power.
See Documentation/devicetree/bindings/regulator/mt6323-regulator.txt
for details for the regulator setup on these boards.
If the property mediatek,mcm isn't defined, following property is required
- reset-gpios: Should be a gpio specifier for a reset line.
Else, following properties are required
- resets : Phandle pointing to the system reset controller with
line index for the ethsys.
- reset-names : Should be set to "mcm".
Required properties for the child nodes within ports container:
- reg: Port address described must be 6 for CPU port and from 0 to 5 for
user ports.
- phy-mode: String, must be either "trgmii" or "rgmii" for port labeled
"cpu".
Port 5 of the switch is muxed between:
1. GMAC5: GMAC5 can interface with another external MAC or PHY.
2. PHY of port 0 or port 4: PHY interfaces with an external MAC like 2nd GMAC
of the SOC. Used in many setups where port 0/4 becomes the WAN port.
Note: On a MT7621 SOC with integrated switch: 2nd GMAC can only connected to
GMAC5 when the gpios for RGMII2 (GPIO 22-33) are not used and not
connected to external component!
Port 5 modes/configurations:
1. Port 5 is disabled and isolated: An external phy can interface to the 2nd
GMAC of the SOC.
In the case of a build-in MT7530 switch, port 5 shares the RGMII bus with 2nd
GMAC and an optional external phy. Mind the GPIO/pinctl settings of the SOC!
2. Port 5 is muxed to PHY of port 0/4: Port 0/4 interfaces with 2nd GMAC.
It is a simple MAC to PHY interface, port 5 needs to be setup for xMII mode
and RGMII delay.
3. Port 5 is muxed to GMAC5 and can interface to an external phy.
Port 5 becomes an extra switch port.
Only works on platform where external phy TX<->RX lines are swapped.
Like in the Ubiquiti ER-X-SFP.
4. Port 5 is muxed to GMAC5 and interfaces with the 2nd GAMC as 2nd CPU port.
Currently a 2nd CPU port is not supported by DSA code.
Depending on how the external PHY is wired:
1. normal: The PHY can only connect to 2nd GMAC but not to the switch
2. swapped: RGMII TX, RX are swapped; external phy interface with the switch as
a ethernet port. But can't interface to the 2nd GMAC.
Based on the DT the port 5 mode is configured.
Driver tries to lookup the phy-handle of the 2nd GMAC of the master device.
When phy-handle matches PHY of port 0 or 4 then port 5 set-up as mode 2.
phy-mode must be set, see also example 2 below!
* mt7621: phy-mode = "rgmii-txid";
* mt7623: phy-mode = "rgmii";
See Documentation/devicetree/bindings/net/dsa/dsa.txt for a list of additional
required, optional properties and how the integrated switch subnodes must
be specified.
Example:
&mdio0 {
switch@0 {
compatible = "mediatek,mt7530";
#address-cells = <1>;
#size-cells = <0>;
reg = <0>;
core-supply = <&mt6323_vpa_reg>;
io-supply = <&mt6323_vemc3v3_reg>;
reset-gpios = <&pio 33 0>;
ports {
#address-cells = <1>;
#size-cells = <0>;
reg = <0>;
port@0 {
reg = <0>;
label = "lan0";
};
port@1 {
reg = <1>;
label = "lan1";
};
port@2 {
reg = <2>;
label = "lan2";
};
port@3 {
reg = <3>;
label = "lan3";
};
port@4 {
reg = <4>;
label = "wan";
};
port@6 {
reg = <6>;
label = "cpu";
ethernet = <&gmac0>;
phy-mode = "trgmii";
fixed-link {
speed = <1000>;
full-duplex;
};
};
};
};
};
Example 2: MT7621: Port 4 is WAN port: 2nd GMAC -> Port 5 -> PHY port 4.
ð {
gmac0: mac@0 {
compatible = "mediatek,eth-mac";
reg = <0>;
phy-mode = "rgmii";
fixed-link {
speed = <1000>;
full-duplex;
pause;
};
};
gmac1: mac@1 {
compatible = "mediatek,eth-mac";
reg = <1>;
phy-mode = "rgmii-txid";
phy-handle = <&phy4>;
};
mdio: mdio-bus {
#address-cells = <1>;
#size-cells = <0>;
/* Internal phy */
phy4: ethernet-phy@4 {
reg = <4>;
};
mt7530: switch@1f {
compatible = "mediatek,mt7621";
#address-cells = <1>;
#size-cells = <0>;
reg = <0x1f>;
pinctrl-names = "default";
mediatek,mcm;
resets = <&rstctrl 2>;
reset-names = "mcm";
ports {
#address-cells = <1>;
#size-cells = <0>;
port@0 {
reg = <0>;
label = "lan0";
};
port@1 {
reg = <1>;
label = "lan1";
};
port@2 {
reg = <2>;
label = "lan2";
};
port@3 {
reg = <3>;
label = "lan3";
};
/* Commented out. Port 4 is handled by 2nd GMAC.
port@4 {
reg = <4>;
label = "lan4";
};
*/
cpu_port0: port@6 {
reg = <6>;
label = "cpu";
ethernet = <&gmac0>;
phy-mode = "rgmii";
fixed-link {
speed = <1000>;
full-duplex;
pause;
};
};
};
};
};
};
Example 3: MT7621: Port 5 is connected to external PHY: Port 5 -> external PHY.
ð {
gmac0: mac@0 {
compatible = "mediatek,eth-mac";
reg = <0>;
phy-mode = "rgmii";
fixed-link {
speed = <1000>;
full-duplex;
pause;
};
};
mdio: mdio-bus {
#address-cells = <1>;
#size-cells = <0>;
/* External phy */
ephy5: ethernet-phy@7 {
reg = <7>;
};
mt7530: switch@1f {
compatible = "mediatek,mt7621";
#address-cells = <1>;
#size-cells = <0>;
reg = <0x1f>;
pinctrl-names = "default";
mediatek,mcm;
resets = <&rstctrl 2>;
reset-names = "mcm";
ports {
#address-cells = <1>;
#size-cells = <0>;
port@0 {
reg = <0>;
label = "lan0";
};
port@1 {
reg = <1>;
label = "lan1";
};
port@2 {
reg = <2>;
label = "lan2";
};
port@3 {
reg = <3>;
label = "lan3";
};
port@4 {
reg = <4>;
label = "lan4";
};
port@5 {
reg = <5>;
label = "lan5";
phy-mode = "rgmii";
phy-handle = <&ephy5>;
};
cpu_port0: port@6 {
reg = <6>;
label = "cpu";
ethernet = <&gmac0>;
phy-mode = "rgmii";
fixed-link {
speed = <1000>;
full-duplex;
pause;
};
};
};
};
};
};