RSB-3730 GPIO
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The IMX8MM bank/bit notation for GPIOs must be formed as "GPIO<GPIO_bank>_<gpio_bit>".
The numeric value of GPIO is calculated as follows:
gpio_bit : 0~31 E.g. GPIO5_22 becomes 150
“GPIO11” and “GPIO12” can be controlled by the CPU or by the i2c extended gpio based on the high and low levels of “GPIO_SELECT”.
Export GPIO then you can use control GPIO from user space through sysfs.
The node numbers of the exported gpio are consistent with the export order, increasing from 1.
Export GPIO1
# echo 150> /sys/class/gpio/export
Set GPIO direction to in/out
# echo "out" > /sys/class/gpio/gpio1/direction
Set GPIO value 0/1 if GPIO pin define is output
# echo 1 > /sys/class/gpio/gpio1/value
Get GPIO value
# cat /sys/class/gpio/gpio1/value