I am using the stock reference minimal (5.4.77-5.2.0+git.297c50e5de78).
I want to use pins SODIMM 101 (gpiochip1 offset=21), and SODIMM 133 (gpiochip1 offset=3))
root@colibri-imx6:~# gpioinfo 1
gpiochip1 - 32 lines:
line 3: "SODIMM_133" unused input active-high
line 21: "SODIMM_101" unused input active-high
Both lines are shown as ‘unused’. Same for:
root@colibri-imx6:~# cat /sys/kernel/debug/gpio
gpiochip1: GPIOs 32-63, parent: platform/20a0000.gpio, 20a0000.gpio:
gpio-35 (SODIMM_133 )
gpio-53 (SODIMM_101 )
I can also use gpioset and gpioget on them.
But when I try to use them via libgpiod I get a “device or resource busy” error:
Here is the setup code:
struct gpiod_line* MCP23017_INTA_line = gpiod_chip_get_line(gpiochip_1, 21);
gpiod_line_request_input(MCP23017_INTA_line, "MCP23017_INTA_line");
if (gpiod_line_request_falling_edge_events(MCP23017_INTA_line, "MCP23017_INTA") !=0){
perror("gpiod_line_request_falling_edge_events(MCP23017_INTA) failed");
}
Full test programm source attached . I have also reflashed the image multiple times, no success.
Help or advice which information I should add to this question is very much appreciated.
Thank you!