Re: Getting gpios from user space based on gpio-line-names

[Bartosz Golaszewski <brgl@xxxxxxxx>]

2017-07-03 15:01 GMT+02:00 Michal Simek <monstr@xxxxxxxxx>:
> Hi,
>
> I am trying to find some docs about how to ask for gpio line
> based on gpio-line-names in DT. I see line names available via debugfs
> which is not suitable for production.
> And also I didn't find a way how to ask for gpio Linux number from user
> space to start to work with them.
> This is for gpio mraa integration which depends on Linux gpio line numbers.
>
> Thanks,
> Michal
>
> --
> Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
> w: www.monstr.eu p: +42-0-721842854
> Maintainer of Linux kernel - Xilinx Microblaze
> Maintainer of Linux kernel - Xilinx Zynq ARM and ZynqMP ARM64 SoCs
> U-Boot custodian - Xilinx Microblaze/Zynq/ZynqMP SoCs
>
>

Hi Michal,

you can try libgpiod[1] and specifically the gpiofind tool included in
the repository. Buildroot has this package should you need to build a
rootfs for some specific target.

Best regards,
Bartosz Golaszewski

[1] https://github.com/brgl/libgpiod
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