I’m trying to set the defaults for the GPIO pins controlled by the TCA9539 GPIO expander on the Jetson.
Where should the device tree be modified?
How to manipulate these I/O’s from a running system?
The standard “echo > export” method fails with “device or resource busy”, probably because the expander driver controls these pins.
the device Jetson TX2 used is tegra186-quill-p3310-1000-c03-00-base.dtb,
it is composite with several module device trees.
you’re able to find them under below path. thanks
I am aware of the location of the DTS file, I was asking more about the exact property value for these pins, but I think I got it already:
, I modified the
property (for the expander at I2C address 0x74).
However, I’m still not sure how to toggle the pins from a running system.