Forums - SAR2130P GPIO Access

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SAR2130P GPIO Access
Join Date: 14 Sep 23
Posts: 1
Posted: Wed, 2024-02-14 11:28

I am trying to access the GPIOs on SAR2130P. These are the permissions and gpiochip*:

/ # ls -l /dev/gpio*

crw-rw----    1 root     gpio      254,   0 Jan  1 00:00 /dev/gpiochip0
crw-rw----    1 root     gpio      254,   1 Jan  1 00:00 /dev/gpiochip1
crw-rw----    1 root     gpio      254,   2 Jan  1 00:00 /dev/gpiochip2
As for gpio:
/sys/kernel/debug # cat gpio
gpiochip0: GPIOs 356-511, parent: platform/f000000.pinctrl, f000000.pinctrl:
gpio0   : in  low  func0 2mA pull down
Adding the base address, gpio0  becomes 357. I cannot export the gpio:
/sys/kernel/debug # echo  357 > export
/bin/sh: can't create export: Permission denied
 ls -l does not list export.
Could you please let me know how I could set permissions. Thank you.


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