NAME

     iic_gpiomux — driver for I2C mux hardware controlled via GPIO

SYNOPSIS

     To compile this driver into the kernel, place the following line in your kernel
     configuration file:

           device iic_gpiomux

     Alternatively, to load the driver as a module at boot time, place the following line in
     loader.conf(5):

           iic_gpiomux_load="YES"

DESCRIPTION

     The iic_gpiomux driver supports any type of I2C bus multiplexer (mux) hardware that is
     controlled by manipulating the state of one or more GPIO pins.  It automatically connects an
     upstream I2C bus to one of the downstream buses as needed when slave devices on the
     downstream buses initiate I/O.  More information on the automatic switching behavior is
     available in iicmux(4).

FDT CONFIGURATION

     On an fdt(4) based system, an iic_gpiomux device node may be defined as a child node of any
     arbitrary bus in the FDT data.  The i2c-parent property indicates the connection to the
     upstream I2C bus.  The children of the iic_gpiomux node are additional i2c buses, which will
     have their own i2c slave devices described in their child nodes.

     The iic_gpiomux driver conforms to the standard i2c/i2c-mux-gpio.txt bindings document.

SEE ALSO

     iicbus(4), iicmux(4),

HISTORY

     The iic_gpiomux driver first appeared in FreeBSD 13.0.