Let me confirm about power supply voltage for VLDO4 in MCIMX7D-SABRE.
According to the MCIMX7D-SABRE schematic (sch-28590_i.mx7d_saber_rev_d.pdf), the VLDO4 is 2.8V.
On the other hand, the voltage of PMIC which implement on the board is 3.3V because the OTP configuration number is "A1".
From the above, the voltage of VLDO4 is changed in u-boot from i.MX.
Am I correct ?
If yes, please tell me which source code change the voltage.