Enabling I2C4 on Xavier Devkit

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

I am having issues using I2C4 (controller i2c@c250000).

If I use a device tree with a device setup on I2C4 there are timeouts and read errors during boot.
If I leave the device disabled in the device tree and try to do an i2cdetect on the bus it just goes very slow and errors out.

The same device on a different bus works fine so I am confident the device tree and driver are working properly. It seems to be something on the Xavier side.

Any ideas?

2

Hi, are you testing on dev kit or custom board? If custom board, what’s the difference to dev kit on this part?

3

Hi pnewmanCTI,

Is this still an issue to support? Or issue has been resolved?

Thanks

4

Hi kayccc,
Yes it is a custom board and the difference is we have an I2C expander connected to it. We have another I 2C expander that is identical on a different I2C bus and it works fine.

And yes it is still a support issue.

The controller might actually be i2c@31e0000 I am not sure. I have tried both.

I have also tried multiple boards so the issue doesn’t seem to be hardware related.