topic Re: gpio_request Fails in linux 4.14.98 in i.MX Processors

gpio_request Fails in linux 4.14.98

yashavantha_yas — Wed, 09 Oct 2019 10:50:43 GMT

Hi,

I am using Linux 4.14.98 Ga release source.

Here when I tried to requets a gpio in 'arch/arm/mach-imx/mach-imx6q.c', it fails with EPROBE_DEFER (517) error.

But able to export same gpio using SYSFS using "echo * > /sys/class/gpio/export" command.

Why it is not able to access it in mach-imx6q.c file? is there any driver dependency?

Best Regards,

Yashavantha

Re: gpio_request Fails in linux 4.14.98

igorpadykov — Wed, 09 Oct 2019 23:16:54 GMT

Hi Yashavantha

one can try to add #include <linux/gpio.h>

Best regards
igor
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Re: gpio_request Fails in linux 4.14.98

yashavantha_yas — Thu, 10 Oct 2019 06:01:27 GMT

Hi Igor,

Thank you for the reply.

I have already included above file.

Also gpio request works fine if the same section is added in 'drivers/gpio/gpio-mxc.c' file.

Best Regards,

Yashavantha

Re: gpio_request Fails in linux 4.14.98

igorpadykov — Thu, 10 Oct 2019 07:55:18 GMT

Hi Yashavantha

one can try to debug it using AN4553 Using Open Source Debugging Tools

for Linux on i.MX Processors
https://www.nxp.com/docs/en/application-note/AN4553.pdf

Best regards
igor