GPIO04 Device or resource busy

Robotics & Edge Computing Jetson & Embedded Systems Jetson Xavier NX
1

Hi,

I have a Xavier NX running 35.2.1. I am trying to use GPIO 04 as an input but I am unable to use it.
sudo cat /sys/kernel/debug/gpio | grep PCC.01 results in gpio-318 (PCC.01 |pwr ) out hi
How can I find the driver in the dtb file to remove from this pin? Ive looked through the device tree but I am unsure how to find this gpio pin. Since the naming is different.

I have properly configured the pin in the pinmux and its configured as an input.

Xavier_NX_dtb.txt (390.0 KB) Here is my dtb file

Thanks in advance

3

Hi,

There should be no changes required in device trees.
It’s a pure pinmux setting.
Please make sure you are re-flashing the device with the updated pinmux config file:
https://docs.nvidia.com/jetson/archives/r35.4.1/DeveloperGuide/text/HR/JetsonModuleAdaptationAndBringUp/JetsonAgxXavierSeries.html?highlight=pinmux#pinmux-changes

4

I found the issue. It was a device tree issue. Pinmux is 100% correct.

In the device tree there was a module named leds_gpio that was using the pin. When removing this module it released the gpio pin and I could use it.

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