[LEDE-DEV] MT7620: wan eth port doesn't work

[Giuseppe Lippolis]

Hi all,
I'm working to port owrt/lede on the dwr-921 (mt7620n based).

Currently I'm able to complete the boot but the wan port (port 4) doesn't
work.
All the other lan port (port 0-3) are working properly.

Yesterday with blogic we though the problem was related to the assignment of
the port-4 to the embedded switch using the 
	mediatek,port4 = "ephy";
property in the dts, but also this doesn't work.
I check in the datasheet and I see that this feature is valid only in the
mt7620a.
According to the DS the mt7620n have only one switch configuration with 5 FE
port:

	 	MT7620N 		MT7620A
		Switch 5p FE SW 	5p FE SW + RGMII(1) 
					4p FE SW + RGMII(2)

When I try, using the oem system, to switch from the 3g wan to the eth wan I
get the following messages on the console:

ramtd_write: to:ff0000 len:10

ramtd_write: to:ff0010 len:f56

ramtd_write: to:ff0000 len:1

ramtd_erase: addr:ff0000 len:0

ramtd_write: to:ff0000 len:10

ramtd_write: to:ff0010 len:f58

ramtd_write: to:ff0000 len:1

device eth2.1 left promiscuous mode

br0: port 1(eth2.1) entering forwarding state

device eth2 left promiscuous mode

device eth2 entered promiscuous mode

device eth2.1 entered promiscuous mode

br0: port 1(eth2.1) entering forwarding state

br0: port 1(eth2.1) entering forwarding state

phy 0, reg 0, val 0x800

phy 1, reg 0, val 0x800

phy 2, reg 0, val 0x800

phy 3, reg 0, val 0x800

ESW: Link Status Changed - Port3 Link Down

phy 4, reg 0, val 0x800

ESW: Link Status Changed - Port4 Link Down

phy 5, reg 0, val 0x800

Ralink HW NAT Module Enabled

ramtd_erase: addr:ff0000 len:0

phy 0, reg 0, val 0x3300

ramtd_write: to:ff0000 len:10

ramtd_write: to:ff0010 len:f58

ramtd_write: to:ff0000 len:1

addrconf_dad_completed 7

phy 1, reg 0, val 0x3300

addrconf_dad_completed 7

phy 2, reg 0, val 0x3300

phy 3, reg 0, val 0x3300

phy 4, reg 0, val 0x3300

phy 5, reg 0, val 0x3300

ESW: Link Status Changed - Port3 Link UP

ESW: Link Status Changed - Port4 Link UP

Ralink HW NAT Module Disabled

And the wan port work as expected.
Therefore, in some way, some sort of configuration is required.

Any ideas?

Following some additional detail:

Device page: https://wiki.openwrt.org/inbox/d-link/d-link_dwr-921_c1

Preliminary Dts:
/dts-v1/;

#include "mt7620n.dtsi"

#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/input/input.h>

/ {
	compatible = "d-link,dwr-921", "ralink,mt7620n-soc";
	model = "D-Link DWR-921 C1";

};

&gpio1 {
	status = "okay";
};

&gpio2 {
	status = "okay";
};

&gpio3 {
	status = "okay";
};

&spi0 {
	status = "okay";

	m25p80 at 0 {
		#address-cells = <1>;
		#size-cells = <1>;
		compatible = "jedec,spi-nor";
		reg = <0>;
		spi-max-frequency = <10000000>;

		bootloader: partition at 0 {
			label = "bootloader";
			reg = <0x0 0x10000>;
			read-only;
		};

		kernel: partition at 10000 {
			label = "kernel";
			reg = <0x10000 0x170000>;
		};

		rootfs: partition at 180000 {
			label = "rootfs";
			reg = <0x180000 0xe60000>;
		};

		config: partition at ff0000 {
			label = "config";
			reg = <0xff0000 0x10000>;
			read-only;
		};

	};
};

&ehci {
	status = "okay";
};

&ohci {
	status = "okay";
};

&ethernet {
	mtd-mac-address = <&config 0xe2ac>;
	mediatek,portmap = "llllw";
};

&wmac {
	ralink,mtd-eeprom = <&config 0xe08e>;
};

&pinctrl {
	state_default: pinctrl0 {
		default {
			ralink,group = "uartf", "i2c", "wdt", "jtag";
			ralink,function = "gpio";
		};
	};
};


etc/board.d/02_network:

	...
        dir-615-h1|\
        dwr-921-c1|\
        firewrt|\
	...
        zbt-wr8305rt)
                ucidef_add_switch "switch0" \
                        "0:lan" "1:lan" "2:lan" "3:lan" "4:wan" "6 at eth0"


Bye.