Add GPIO I2C interfaces

We are looking at adding I/O expanders on an I2C bus (TCA6416), how do we go about adding them to the GPIO interface?

hello lloyd_j_strickler,

you may refer to [Tegra Linux Driver Package TX1 Adaptation Guide], searching GPIO keywords for some instructions.
also, you could also check [Tegra Linux Driver Package TX2 Adaptation Guide]-> [GPIO changes] chapter for how to get the gpio number examples.

I’ll take a look again at the TX1 side but what was there didn’t help. I didn’t think the TX2 GPIO interface applied but I’ll look at that too.
We can toggle specific I/Os on the dev board that exist on our board but when we install the Jetson on our board the same commands don’t toggle the pins any more.