config I2C_MUX bool "Support I2C multiplexers" depends on DM_I2C help This enables I2C buses to be multiplexed, so that you can select one of several buses using some sort of control mechanism. The bus select is handled automatically when that bus is accessed, using a suitable I2C MUX driver. config SPL_I2C_MUX bool "Support I2C multiplexers on SPL" depends on SPL && I2C_MUX help This enables I2C buses to be multiplexed, so that you can select one of several buses using some sort of control mechanism. The bus select is handled automatically when that bus is accessed, using a suitable I2C MUX driver. config I2C_ARB_GPIO_CHALLENGE bool "GPIO-based I2C arbitration" depends on I2C_MUX help If you say yes to this option, support will be included for an I2C multimaster arbitration scheme using GPIOs and a challenge & response mechanism where masters have to claim the bus by asserting a GPIO. config I2C_MUX_PCA954x tristate "TI PCA954x I2C Mux/switches" depends on I2C_MUX help If you say yes here you get support for the TI PCA954x I2C mux/switch devices. It is x width I2C multiplexer which enables to partitioning I2C bus and connect multiple devices with the same address to the same I2C controller where driver handles proper routing to target i2c device. Supported chips are PCA9543, PCA9544, PCA9546, PCA9547, PCA9548 and PCA9646. config I2C_MUX_GPIO tristate "GPIO-based I2C multiplexer" depends on I2C_MUX && DM_GPIO help If you say yes to this option, support will be included for a GPIO based I2C multiplexer. This driver provides access to I2C busses connected through a MUX, which is controlled through GPIO pins.