We are using MIMXRT1176DVMAA NXP processor some of the pins are not using in our application (Ex. MIPI and USB interface),so those pins shall we left the pins are floating or tie to GND with resistor for signal and power pins.
Hello,
I recommend reviewing the section 7.8 Unused pins recommendation in the Hardware design guide.
https://www.nxp.com/webapp/Download?colCode=MIMXRT1170HDUG
If you have more related questions, please let me know.
Best regards,
Pavel