On some platforum the external phy can only interface to the port 5 of the
switch because the RGMII TX and RX lines are swapped. But it still can be
useful to use the internal phy of the switch to act as a WAN port which
connectes to the 2nd GMAC. This gives WAN port dedicated bandwidth to
the SOC. This increases the LAN and WAN routing.
By adding the optional property mediatek,ephy-handle, the external phy
is put in isolation mode when internal phy is connected to 2nd GMAC via
phy-handle property.
Signed-off-by: René van Dorst <opensou...@vdorst.com>
---
.../devicetree/bindings/net/dsa/mt7530.txt | 116 +++++++++++++++++-
1 file changed, 115 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/net/dsa/mt7530.txt
b/Documentation/devicetree/bindings/net/dsa/mt7530.txt
index f3486780f2c2..1e79fba5a774 100644
--- a/Documentation/devicetree/bindings/net/dsa/mt7530.txt
+++ b/Documentation/devicetree/bindings/net/dsa/mt7530.txt
@@ -60,10 +60,20 @@ Depending on how the external PHY is wired:
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.
+Optional property:
+
+- mediatek,ephy-handle: Phandle of the external phy. In case you want to use
+ P0/4 as WAN port and have an external phy attached.
+ With this property the external phy is put in isolation
+ and powerdown mode in mode 2.
+
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.
+When phy-handle matches PHY of port 0 or 4 then port 5 set-up as mode 2 and
when
+propertly "mediatek,ephy-handle" is valid it puts the externel phy in isolation
+mode.
+
phy-mode must be set, see also example 2 below!
* mt7621: phy-mode = "rgmii-txid";
* mt7623: phy-mode = "rgmii";
@@ -309,3 +319,107 @@ Example 3: MT7621: Port 5 is connected to external PHY:
Port 5 -> external PHY.
};
};
};
+
+Example 4: MT7621: Port 4 is WAN port: 2nd GMAC -> P5 -> PHY P4
+ with an external phy.
+
+ð {
+ status = "okay";
+
+ 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 4 */
+ phy4: ethernet-phy@4 {
+ reg = <4>;
+ };
+
+ /* external phy addr 0x07 */
+ 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;
+
+ /* Put this external phy in power-down and isolation
+ * when port 5 is used in PHY P0/P4 or DSA mode. Because
+ * external phy and port 5 share same bus to 2nd GMAC.
+ */
+ mediatek,ephy-handle = <&ephy5>;
+
+ 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;
+ };
+ };
+ };
+ };
+ };
+};
--
2.20.1
