Hello,
From hardware specs of the i.MX8Mm [Table 9 (Operating ranges) in IMX8MMCEC],
USB1_VBUS and USB2_VBUS should be in range 0.800 -- 3.60 V, typ = 1.40 V.
So it is possible to connect the VBUS to any output of allowed voltage, but
it is USB VBUS input detect signal, which reflects USB VBUS, used in USB protocols.
https://www.nxp.com/docs/en/data-sheet/IMX8MMCEC.pdf
Regards,
Yuri.
