[FAQ] TPS65916: Which I2C bus should I use?

I2C2 is a subset of I2C1 - I2C1 can access all registers, including AVS-registers.

I2C2 can access exclusively the AVS-registers. It's intended to be used if heavy traffic is expected on the general purpose I2C bus (I2C1), to make sure AVS-adaption can be executed without delay.

If only one bus shall be used, I2C1 should be chosen to gain global access. I2C2 additionally has no dedicated pins, but is multiplexed on GPIO_2 and GPIO_4. Using I2C2 consequently eliminates the use of those GPIOs for other functions (ENABLE1 and DVFS_DAT, resp. REGEN2, DVFS_CLK).