GPIO questions

Robotics & Edge Computing Jetson Systems Jetson Orin NX
1

Hi,
we have a custom design with Jetson Orin NX SOM. I’d like to use GPIO06, pin #130 of SOM. According to the pinmux table it is configured as PCC.03, which is line15 of gpiochip1 . When I want to access it with “gpioget 1 15” I get:
“Device or resource busy”.
In /sys/kernel/debug/gpio I can see this:
“gpio-331 (PCC.03 |(null) ) out hi”

How can I find out what’s using GPIO06?

And I’d like to ask another question: how can I use CAM1_MCLK as GPIO? According to the Pin Description Spreadsheet function #2 for this pin is GPIO.

Thanks for any help!

3

It seems display@13800000 is using this pin as reset gpio.

nvidia,panel-rst-gpio = <&tegra_aon_gpio TEGRA234_AON_GPIO(CC, 3) GPIO_ACTIVE_HIGH>; // CAM_INT4

You could just configure it as GPIO through pinmux spreadsheet to set it to GPIO3_PP.01.

4

Thank you very much!
Actually it wasn’t display@13800000 which was using GPIO06 but you gave me a good hint what to search for in the device-tree: TEGRA234_AON_GPIO(CC, 3) macro. It turned out PCC.03 was used by cam_i2cmux, which was used by imx219 and imx477 cameras. So I just removed the include line from tegra234-p3509-a02.dtsi and GPIO06 became free to use.