Send reset signal

How do I send a reset signal on pin 6 under linux using sysfs?

If you are referring to pin 6 on the 40 pin gpio connector, you don’t.

RST_BTN_N

That pin is an INPUT pin. If you short it to GND, it will cause the SoC to go into reset.

If you are referring to pin 6 of the CSI camera connector, that will be configured in DTS and managed by the camera driver.

So ultimately, the answer to your question is “you don’t”.

Got it. So I hook up pin25 (GPIOB_24 => gpio 56) to pin 6, I could reset the device via sysfs by writing 1 to gpio 56.

But I can’t seem to get the other GPIO pins to work. pin 28, GPIO_A22 does not seem to correspond to gpio 22. Writing 1 to gpio 22 does not light up the LED I placed on that pin.