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BQ25798: standard and fast I2C speed mode both supported on BQ25798, but how to set the mode?

Part Number: BQ25798

The BQ25798 charger IC supports both 100KHz and 400KHz I2C speed, referred as standard mode and fast mode.

There is no register or pin would allow me to set the mode.

My be the chip will accept any speed lower than 400KHz without settings, if this is the case, what is the term of standard speed mode used for?