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+.\"-
+.\" SPDX-License-Identifier: BSD-2-Clause
+.\"
+.\" Copyright (c) 2019 Ian Lepore <ian@freebsd.org>
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd January 1, 2020
+.Dt IIC_GPIOMUX 4
+.Os
+.Sh NAME
+.Nm iic_gpiomux
+.Nd driver for I2C mux hardware controlled via GPIO
+.Sh SYNOPSIS
+To compile this driver into the kernel,
+place the following line in your
+kernel configuration file:
+.Bd -ragged -offset indent
+.Cd "device iic_gpiomux"
+.Ed
+.Pp
+Alternatively, to load the driver as a
+module at boot time, place the following line in
+.Xr loader.conf 5 :
+.Bd -literal -offset indent
+iic_gpiomux_load="YES"
+.Ed
+.Sh DESCRIPTION
+The
+.Nm
+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
+.Xr iicmux 4 .
+.Sh FDT CONFIGURATION
+On an
+.Xr fdt 4
+based system, an
+.Nm
+device node may be defined as a child node of any arbitrary bus
+in the FDT data.
+The
+.Va i2c-parent
+property indicates the connection to the upstream I2C bus.
+The children of the
+.Nm
+node are additional i2c buses, which will have their own i2c slave
+devices described in their child nodes.
+.Pp
+The
+.Nm
+driver conforms to the standard
+.Bk -words
+.Li i2c/i2c-mux-gpio.txt
+.Ek
+bindings document.
+.Sh SEE ALSO
+.Xr iicbus 4 ,
+.Xr iicmux 4
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Fx 13.0 .