customs gpio driver

Robotics & Edge Computing Jetson Systems Jetson TX2
1

environment:jetpack 4.2
I need custom gpio driver, which c file need modify in source code?

2

Does this post help? It is well discussed how to use GPIOs in the Jetson TX2

Moreover, jchaves also details how to configure GPIOs in the DT in this post.

3

1.I know how to use GPIOs in the jetson TX2, i can control the pin creat a square wave of 10kHZ.
2. The reference URL jchaves provided is no longer valid.
questions: When I increased the frequency to 200kHZ, the square wave got distorted. bellow is the list of pins i have test. only gpio466 can creat a square wave of 200kHZ. Is there anything special about gpio466? How do I set the other pins to the same?
jetsonTX2GPIONumber gpio_group[GPIO_NUM_J21] =
{
gpio396, // J21 -Pin 7 0
gpio466, // J21 -Pin 11 1 0k
gpio397, // J21 -Pin 13 2
gpio255, // J21 -Pin 15 3
gpio429, // J21 -Pin 19 4
gpio428, // J21 -Pin 21 5
gpio427, // J21 -Pin 23 6
gpio398, // J21 - Pin 29 7
gpio298, // J21 -Pin 31 8
gpio389, // J21 -Pin 33 9
gpio395, // J21 -Pin 35 10
gpio388, // J21 -Pin 37 11

        gpio392,  // J21  -Pin 12 12
        gpio296_, // J21  -Pin 16 13
        gpio481,  // J21  -Pin 18 14
        gpio254,  // J21  -Pin 22 15
        gpio430,  // J21  -Pin 24 16
        gpio297,  // J21  -Pin 32 17
        gpio467,  // J21 - Pin 36 18
        gpio394,  // J21 - Pin 38 19
        gpio393,  // J21 - Pin 40 20
    };