topic Re: how to control Atom C3558 GPIO under Linux? in Embedded Intel Atom® Processors

how to control Atom C3558 GPIO under Linux?

wolfsu — Fri, 11 Dec 2020 09:03:43 GMT

HW use GPIO[5] pin(output of C3558) connected to an input pin of WiFi chip to pull high/low on this pin.

What Linux driver or kernel module should I use to control this GPIO?

There is only 1 gpiochip508 in my sys-fs as below, but it seems to be used for UART to USB control:

$ ll /sys/class/gpio/
total 0
drwxr-xr-x 2 root root 0 Dec 11 09:41 ./
drwxr-xr-x 68 root root 0 Dec 11 09:41 ../
--w------- 1 root root 4096 Dec 11 09:41 export
lrwxrwxrwx 1 root root 0 Dec 11 09:41 gpiochip508 -> ../../devices/pci0000:00/0000:00:15.0/usb1/1-3/1-3:1.0/gpio/gpiochip508/
--w------- 1 root root 4096 Dec 11 09:41 unexport

$ lspci -s 00:15.0
00:15.0 USB controller: Intel Corporation Atom Processor C3000 Series USB 3.0 xHCI Controller (rev 11)

$ cat /sys/class/gpio/gpiochip508/label
cp210x