[LEDE-DEV] mt7621 wdt reset- console not accepting commands

[K.Mani]

The mediatek board 'mt7621', is having a external watchdog timer, it
resets the GPIO-18 every 500ms.
To handle this scenario.

I modified the our dts file dummy.dts, added 'wdt-gpio'

#include "mt7621.dtsi"/ {
       compatible = "mediatek,dummy", "mediatek,mt7621-soc";
       model = "Dummy MT7621";
    memory at 0 {
               device_type = "memory";
               reg = <0x0 0x8000000>;
       };        chosen {
               bootargs = "console=ttyS1,115200n8";
       };
        wdt-gpio {
               compatible = "linux,wdt-gpio";
               gpios = <&gpio0 18 1>;
               hw_algo = "toggle";
               hw_margin_ms = <400>;
               always-running = <1>;
       };
};

Added the following in Kernel config file, config-4.9
CONFIG_GPIO_WATCHDOG=y
CONFIG_GPIO_WATCHDOG_ARCH_INITCALL=y

to compile, drivers/watchdog/gpio_wdt.c

But, this resulted  in 'gpio_wdt_probe', getting called before mt7621_gpio.
logs->
[    0.410000] gpio_wdt_probe,
[    0.420000] gpio_wdt_probe, 170, priv->gpio=-517, flags=-2146148000
[    0.490000] mt7621_gpio 1e000600.gpio: registering 32 gpios
[    0.490000] mt7621_gpio 1e000600.gpio: registering 32 gpios
[    0.500000] mt7621_gpio 1e000600.gpio: registering 32 gpios
[    0.500000] clocksource: Switched to clocksource GIC
[    0.510000] NET: Registered protocol family 2

So i modified
drivers/watchdog/gpio_wdt.c
-arch_initcall(gpio_wdt_init);
+subsys_initcall(gpio_wdt_init);

This resulted in, correct sequence..
mt7621_gpio 1e000600.gpio: registering 32 gpios
[    0.450000] mt7621_gpio 1e000600.gpio: registering 32 gpios
[    0.460000] mt7621_gpio 1e000600.gpio: registering 32 gpios
[    0.460000] of_get_named_gpio_flags, 112
[    0.470000] gpio_wdt_probe, priv->gpio=18
[    0.470000] gpio_wdt_probe, 216


The device WDT reset is not happening anymore, and boots fully..

[   12.690000] br-lan: port 1(eth0.1) entered disabled state
[   12.700000] device eth0.1 entered promiscuous mode
[   12.710000] device eth0 entered promiscuous mode
[   12.720000] br-lan: port 1(eth0.1) entered blocking state
[   12.720000] br-lan: port 1(eth0.1) entered forwarding state
[  103.470000] mtk_soc_eth 1e100000.ethernet eth0: port 3 link down
[  111.710000] mtk_soc_eth 1e100000.ethernet eth0: port 3 link up

But the issue is console not accepting commands
when i press enter or type anything the command is not seen on the console.

Can someone help me!!

Mani
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