i.MX8M Plus: IOMUX CTS/RTS directions are reversed

[adrianocarvalhodtx]

Hello,

We are having some issues related to the UART4 in a i.MX8M Plus

After some investigation, it seems that the IOMUX CTS/RTS directions are reversed (in DCE and DTE mode).

In the figure below:

• TX/RX in both cases are output/input and matches the diagram in the center-right.
• However, CTS/RTS in both cases are input/output but that doesn't match the diagram.

Contrast this with the second image below based on a i.MX6. CTS/RTS are output/input as expected.

Is this analysis correct?
Where are we wrong?
What can we do to correct this?

Thank you.

Best regards,
Adriano Carvalho

[JorgeCas]

Hello,

This is an issue in the tool that is already reported, it will be fixed in next release.

Best regards.

[adrianocarvalhodtx]

Hello,

Is this just an issue with the tool where it display "input" when it should display "output" and vice versa? Or are the dts files affected as well? Are the values in "imx8mp-pinfunc.h" correct?

Best regards,
Adriano Carvalho

[JorgeCas · Accepted solution]

Hello,

It is an issue with the tool, is not showing the correct signals direction.

Best regards.