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-<table class="head">
- <tr>
- <td class="head-ltitle">PCF8574(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">PCF8574(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">pcf8574</code> &#x2014; <span class="Nd">driver
- for the PCF8574 8-bit I2C IO expander</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 lines
- in your kernel configuration file:</p>
-<div class="Bd Pp Bd-indent"><code class="Cd">device pcf8574</code>
-<br/>
-<code class="Cd">device gpio</code>
-<br/>
-<code class="Cd">device iicbus</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>pcf8574_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">pcf8574</code> driver provides
- <a class="Xr">gpiobus(4)</a> control over 8 GPIO pins. The pins are
- quasi-bidirectional. Only low output can be actively driven. High output is
- equivalent to input.</p>
-<p class="Pp">On an <a class="Xr">FDT(4)</a> based system the following
- properties must be set:</p>
-<dl class="Bl-tag">
- <dt id="compatible"><var class="Va">compatible</var></dt>
- <dd>Must be set to &quot;nxp,pcf8574&quot;.</dd>
- <dt id="reg"><var class="Va">reg</var></dt>
- <dd>The I2C address of <code class="Nm">pcf8574</code>.</dd>
-</dl>
-<p class="Pp">The DTS part for a <code class="Nm">pcf8574</code> device usually
- looks like:</p>
-<div class="Bd Pp Li">
-<pre>/ {
-
- ...
- pcf8574@27 {
- compatible = &quot;nxp,pcf8574&quot;;
- reg = &lt;0x27&gt;;
- };
-};</pre>
-</div>
-</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">fdt(4)</a>, <a class="Xr">gpiobus(4)</a>,
- <a class="Xr">iicbus(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">pcf8574</code> driver and this manual page
- was written by <span class="An">Andriy Gapon</span>
- &lt;<a class="Mt" href="mailto:avg@FreeBSD.org">avg@FreeBSD.org</a>&gt;.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
-<p class="Pp">The <code class="Nm">pcf8574</code> driver does not support the
- input change interrupt that the hardware provides.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">November 6, 2021</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>