====== GPIO pinmux configuration ======

There is 'qca_mux_ctl' utility that can configure GPIO pinmux settings. It is included in default 8devices firmware image. Config is saved in ''/etc/qca_mux_conf.json'' file and applied by running ''qca_mux_ctl'' command.

===== Example configs =====

==== Second UART port ====
/etc/qca_mux_conf.json

  {
        "mux_list": [
                {"gpio" : 21, "signal_direction": "IN", "gpio_direction" : "IN","signal": "UART1_RD"},
                {"gpio" : 22, "signal_direction": "OUT", "gpio_direction" : "OUT","signal": "UART1_TD"}
                ],
        "functions": [
                ]
  }


Serial port is available at /dev/ttyATH0

Quick test: ''echo AAAA > /dev/ttyATH0''

Terminal: 
  opkg update
  opkg install picocom
  picocom -b 115200 /dev/ttyATH0
  
==== I2C ====
/etc/qca_mux_conf.json

  {
	"mux_list": [
		{"gpio" : 21, "signal_direction": "IN", "gpio_direction" : "OUT","signal": "I2C_DATA"},
		{"gpio" : 21, "signal_direction": "OUT", "gpio_direction" : "OUT","signal": "I2C_DATA"},
		{"gpio" : 22, "signal_direction": "OUT", "gpio_direction" : "OUT","signal": "I2C_CLK"}
		],
	"functions": [
		]
  }