By default, the PMIC LDO7 is set to 1.2V in hardware. This is changed to 1.8V (can be customizable) in iWave FSBL and sustained throughout boot. This can be changed to required voltage on the fly after U-boot or Kernel through I2C utility.
U-boot:
i2c dev 0 #Select the I2C bus
i2c probe # Make sure the PMIC is detected in 0X5A
i2c mw 0x5A 0x2C 0x1 # LDO7 enable
i2c mw 0x5A 0xAF 0x22 # Set LDO7 voltage to 2.50V
Kernel:
i2cset -f -y 0 0x5A 0x2C 0x1
i2cset -f -y 0 0x5A 0xAF 0x22
Please refer ‘DA9063.pdf’ document for the hex value (for required voltage) in I2C command.
For further inquiries, please get in touch with mktg@iwave-global.com
Please find the detailed G36S product information in the below link,