MT300N how to enable I2C & second UART?

Xudonax · 2018-03-21T19:21:51.604Z

Hello there, I want to use both the I2C and second UART that are available according to the pinout. What do I need to do to enable these? Would this be bit-banging the GPIO ports or?

kyson-lok · 2018-03-27T02:24:38.246Z

We configure this to general GPIO by default, if you want to use those functionality, you can build a image by yourselt.

Firstly, change dts which is located in target/linux/ramips/dts/MT7628.dts.

Change

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

To

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

Enable i2c and uart, add those lines.

&i2c {
	status = "okay";
};
&uart1  {
	status = "okay";
};