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+<table class="head">
+  <tr>
+    <td class="head-ltitle">MCPGPIO(4)</td>
+    <td class="head-vol">Device Drivers Manual</td>
+    <td class="head-rtitle">MCPGPIO(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">mcpgpio</code> &#x2014; <span class="Nd">Driver
+    for Microchip I/O Expanders on I2C and SPI bus</span></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
+<section class="Ss">
+<h2 class="Ss" id="I2C"><a class="permalink" href="#I2C">I2C</a></h2>
+<p class="Pp"><code class="Cd">mcpgpio* at iic? addr ?</code>
+  <br/>
+  <code class="Cd">gpio* at gpiobus?</code></p>
+</section>
+<section class="Ss">
+<h2 class="Ss" id="SPI"><a class="permalink" href="#SPI">SPI</a></h2>
+<p class="Pp"><code class="Cd">mcpgpio0 at spi? slave 0 flags 0</code>
+  <br/>
+  <code class="Cd">mcpgpio1 at spi? slave 0 flags 1</code>
+  <br/>
+  <code class="Cd">mcpgpio2 at spi? slave 0 flags 2</code>
+  <br/>
+  <code class="Cd">mcpgpio3 at spi? slave 0 flags 3</code>
+  <br/>
+  <code class="Cd">gpio* at gpiobus?</code></p>
+</section>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
+<p class="Pp">The <code class="Nm">mcpgpio</code> driver supports the following
+    Microchip I/O Expanders:</p>
+<dl class="Bl-tag">
+  <dt>MCP23008</dt>
+  <dd>8-bit I/O expander, I2C interface</dd>
+  <dt>MCP23S08</dt>
+  <dd>8-bit I/O expander, SPI interface</dd>
+  <dt>MCP23017</dt>
+  <dd>16-bit I/O expander, I2C interface</dd>
+  <dt>MCP23S17</dt>
+  <dd>16-bit I/O expander, SPI interface</dd>
+  <dt>MCP23018</dt>
+  <dd>16-bit I/O expander, open-drain outputs, I2C interface</dd>
+  <dt>MCP23S18</dt>
+  <dd>16-bit I/O expander, open-drain outputs, SPI interface</dd>
+</dl>
+<p class="Pp">Access to the pins is provided by the <a class="Xr">gpio(4)</a>
+    interface.</p>
+<p class="Pp">The SPI version of these devices support multiple chips per chip
+    select signal. On the MCP23S08 and MCP23S17, this is achieved by tying the
+    address select pins to VDD or GND to select an address (0-3 on MCP23S08 or
+    0-7 on MCP23S17). The MCP23S18 has a similar capability, but uses an analog
+    voltage input on a single address select pin, along with an internal voltage
+    divider ladder and a series of comparators to generate the 3 address bits;
+    see the data sheet for details. The <var class="Ar">flags</var> argument in
+    the configuration directive for SPI attachments selects the hardware address
+    of the chip instance for that driver instance.</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">gpio(4)</a>, <a class="Xr">iic(4)</a>,
+    <a class="Xr">intro(4)</a>, <a class="Xr">spi(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">mcpgpio</code> driver first appeared in
+    <span class="Ux">NetBSD 7.0</span>. It was overhauled in
+    <span class="Ux">NetBSD 10.0</span> to support additional chip types and to
+    add the I2C attachment.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
+<p class="Pp">The <code class="Nm">mcpgpio</code> driver was written by
+    <span class="An">Frank Kardel</span>
+    &lt;<a class="Mt" href="mailto:kardel@NetBSD.org">kardel@NetBSD.org</a>&gt;
+    and <span class="An">Jason R. Thorpe</span>
+    &lt;<a class="Mt" href="mailto:thorpej@NetBSD.org">thorpej@NetBSD.org</a>&gt;.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
+<p class="Pp">SPI instances of the <code class="Nm">mcpgpio</code> driver do not
+    utilize the Device Tree bindings for this device.</p>
+<p class="Pp">The <code class="Nm">mcpgpio</code> driver does not currently act
+    as a GPIO provider for the platform device tree.</p>
+</section>
+</div>
+<table class="foot">
+  <tr>
+    <td class="foot-date">January 10, 2022</td>
+    <td class="foot-os">NetBSD 10.1</td>
+  </tr>
+</table>