.\"	$NetBSD: mcp23s17gpio.4,v 1.2 2014/04/07 11:18:13 wiz Exp $
.\"
.\"Copyright (c) 2014 Frank Kardel
.\"All rights reserved.
.\"
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.\"modification, are permitted provided that the following conditions
.\"are met:
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.\"   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
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.\"THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS
.\"``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.Dd April 6, 2014
.Dt MCP23S17GPIO 4
.Os
.Sh NAME
.Nm mcp23s17gpio
.Nd Driver for MCP23S17 gpio chip via SPI bus
.Sh SYNOPSIS
.Cd "mcp23s17gpio0 at spi? slave 0 flags 0"
.Cd "mcp23s17gpio1 at spi? slave 0 flags 1"
.Cd "mcp23s17gpio2 at spi? slave 0 flags 2"
.Cd "mcp23s17gpio3 at spi? slave 0 flags 3"
.Cd "gpio* at gpiobus?"
.Sh DESCRIPTION
The
.Nm
driver supports up to 8 instances of the MCP23S17 16-bit GPIO chips.
Access to the pins is provided by the
.Xr gpio 4
interface.
The
.Nm
.Ar flags
argument selects the hardware address of the chip instance.
.Sh SEE ALSO
.Xr gpio 4 ,
.Xr intro 4 ,
.Xr spi 4
.Sh HISTORY
The
.Nm
driver first appeared in
.Nx 7.0 .
.Sh AUTHORS
.An -nosplit
The
.Nm
driver was written by
.An Frank Kardel Aq Mt kardel@NetBSD.org .