Other NXP ProductsのトピックGPIO control on LS1021ATSN

GPIO control on LS1021ATSN

Waner — Thu, 11 Mar 2021 10:22:19 GMT

Hi,

I am looking for doing a test code with controling some GPIO on my NXP LS1021ATSN board, such as turn on a led, or put a GPIO at high state for example.

But with searching on the board, I really do not find anything concerning this GPIO manipulation, and I do not find sysfs macro such as "export" or a folder called /sys/class/gpio.

Can you help me to know how to control GPIOs on this board ?

Thanks.

Re: GPIO control on LS1021ATSN

yipingwang — Mon, 15 Mar 2021 07:34:03 GMT

Please refer to https://community.nxp.com/t5/Layerscape-Knowledge-Base/LS1043-GPIO-support-in-Linux-SDK/ta-p/1103689

https://community.nxp.com/t5/QorIQ/Toggle-Gpio-pin-in-ls1021-atwr/m-p/1076332#M9519

Re: GPIO control on LS1021ATSN

Waner — Mon, 15 Mar 2021 11:33:08 GMT

Hi,

Thanks for your answer, I took a look on both links and on documents on which they refer to.

However, concerning RCW, they are using a bitbake compilation but I did not start from a yocto project but from the SDK in the getting started document. (I found my RCW file here : /openil/output/build/host-uboot-tools-2020.01/board/freescale/ls1021atsn)

Moreover, I cannot find GPIO Driver configuration in make menuconfig, so I cannot link GPIO with sysfs..

Do I really need to start with a yocto project just to control one GPIO on my board, or do I not understand the way to do it ?

Thanks for your answer.

Re: GPIO control on LS1021ATSN

yipingwang — Tue, 16 Mar 2021 10:38:02 GMT

Please run the following command to build Linux Kernel image with GPIO driver enabled.

$ make nxp_ls1021atsn_defconfig

$ make linux-menuconfig

Configure Linux Kernel as the following.

Device Drivers --->

-*- GPIO Support --->

[*] /sys/class/gpio/... (sysfs interface)

Memory mapped GPIO drivers --->

[*] MPC512x/MPC8xxx/QorIQ GPIO support

$ make linux

Please modify rcw file in output/build/qoriq-rcw/git/ls1021atsn/SSR_PNS_30/, then run the following command to rebuild RCW.

$ make host-qoriq-rcw-rebuild

Re: GPIO control on LS1021ATSN

Waner — Tue, 16 Mar 2021 12:50:44 GMT

Hi @yipingwang

Thank you for the first step, I did not know that it was make linux-menuconfig instead of classic menuconfig.

However, the path for rcw that you gave me does not exist for me in my openil SDK. (I checked after the make linux command).

Re: GPIO control on LS1021ATSN

yipingwang — Wed, 17 Mar 2021 03:39:55 GMT

In my openil build environment, RCW is in output/build/host-qoriq-rcw-LSDK-20.04/ls1021atsn/SSR_PNS_30/.