topic Need platform file for GPIO setting etc. in i.MX Processors

Need platform file for GPIO setting etc.

hsiddiquee — Thu, 17 Dec 2020 18:21:48 GMT

Hello All,

I'm using imx8m Mini eval kit with Yocto Linux on it. I'm working on a RFID ST25r3916 Discovery board for NFC communication. This task required platform.h file. To provides platform specific settings like GPIO assignment, system resources, locks and IRQs, which are required for correct operation of the RFAL.

can anyone guild me how can I get those files. Or in case I need to implement those files, is there any document to do it.

Thank you

Re: Need platform file for GPIO setting etc.

igorpadykov — Thu, 17 Dec 2020 23:24:53 GMT

Hi hsiddiquee

one can look at processor resource description in i.MX Linux Reference Manual

it shows files location in linux:

https://source.codeaurora.org/external/imx/linux-imx/tree/?h=imx_5.4.47_2.2.0

https://www.nxp.com/design/software/embedded-software/i-mx-software/embedded-linux-for-i-mx-applications-processors:IMXLINUX?tab=In-Depth_Tab

Best regards
igor

Re: Need platform file for GPIO setting etc.

hsiddiquee — Mon, 28 Dec 2020 18:48:09 GMT

None of the source help me to find gpiochip mapping. I found the library that is build for Raspberry and it is working great with NXP. But I need gpiochip map to physical pin on imx8m mini eval. It would be great if you can tell me how these gpiochip map with the external physical pins. I'm also interested in any particular formula to calculate gpio number from gpiochip bank and line number.

Thank you