mt7620a expand serial port

There are two files to be modified:

mt7620a.dtsi

h1>

Enter /home/ihid/chaos_calmer/target/linux/ramips/dts/mt7620a.dtsi

pinctrl {

 state_default: pinctrl0 {
< br /> gpio {

 ralink,group ="i2c","uartf";

 ralink,function ="gpio";

} ;

 };

 };

Remove uartf.

MT7620a.dtsi

Enter /home/ihid/chaos_calmer/target/linux/ramips/dts/MT7620a.dtsi

< pre>chosen {

bootargs =”console=ttyS0,57600″;

};

Change this ttyS0 to ttyS1 because of the serial port driver After getting up, ttyS0 is used to expand the serial port. Select ttyS0 when opening the serial port

[email protected] {

 compatible ="ralink,mt7620a-uart","ralink,rt2880-uart", "ns16550a";

 reg = <0x500 0x100>;

 

 resets = <&rstctrl12>;

 reset-names ="uart"; 

 

 interrupt-parent =<&intc>;

 interrupts = <5>;

 
 
 reg-shift = <2>; 

 

 status ="disabled";

status= “disabled”; Change to:

pinctrl-names = "default";

 pinctrl-0 = <&uartf_gpio_pins>;

 status = "ok";

< p> That is, comment out or delete the sentence status = “disabled”;, plus the sentence that the default serial port driver is not loaded.

pcm_i2s_pins: pcm_i2s {

 pcm_i2s {

 ralink,group ="uartf";

 ralink,function =" pcm i2s";

 };

 };

 uartf_gpio_pins: uartf_gpio {

 uartf_gpio {
 
 ralink,group ="uartf";

 ralink,function ="gpio uartf";

 };

here ralink, The value of function is changed to uartf.