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+<table class="head">
+  <tr>
+    <td class="head-ltitle">IIC_GPIOMUX(4)</td>
+    <td class="head-vol">Device Drivers Manual</td>
+    <td class="head-rtitle">IIC_GPIOMUX(4)</td>
+  </tr>
+</table>
+<div class="manual-text">
+<section class="Sh">
+<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
+<p class="Pp"><code class="Nm">iic_gpiomux</code> &#x2014;
+    <span class="Nd">driver for I2C mux hardware controlled via GPIO</span></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
+<p class="Pp">To compile this driver into the kernel, place the following line
+    in your kernel configuration file:</p>
+<div class="Bd Pp Bd-indent"><code class="Cd">device iic_gpiomux</code></div>
+<p class="Pp">Alternatively, to load the driver as a module at boot time, place
+    the following line in <a class="Xr">loader.conf(5)</a>:</p>
+<div class="Bd Pp Bd-indent Li">
+<pre>iic_gpiomux_load=&quot;YES&quot;</pre>
+</div>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
+<p class="Pp">The <code class="Nm">iic_gpiomux</code> 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 <a class="Xr">iicmux(4)</a>.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="FDT_CONFIGURATION"><a class="permalink" href="#FDT_CONFIGURATION">FDT
+  CONFIGURATION</a></h1>
+<p class="Pp">On an <a class="Xr">fdt(4)</a> based system, an
+    <code class="Nm">iic_gpiomux</code> device node may be defined as a child
+    node of any arbitrary bus in the FDT data. The
+    <var class="Va">i2c-parent</var> property indicates the connection to the
+    upstream I2C bus. The children of the <code class="Nm">iic_gpiomux</code>
+    node are additional i2c buses, which will have their own i2c slave devices
+    described in their child nodes.</p>
+<p class="Pp">The <code class="Nm">iic_gpiomux</code> driver conforms to the
+    standard <code class="Li">i2c/i2c-mux-gpio.txt</code> bindings document.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
+  ALSO</a></h1>
+<p class="Pp"><a class="Xr">iicbus(4)</a>, <a class="Xr">iicmux(4)</a></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
+<p class="Pp">The <code class="Nm">iic_gpiomux</code> driver first appeared in
+    <span class="Ux">FreeBSD 13.0</span>.</p>
+</section>
+</div>
+<table class="foot">
+  <tr>
+    <td class="foot-date">January 1, 2020</td>
+    <td class="foot-os">FreeBSD 15.0</td>
+  </tr>
+</table>