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+.\"	$NetBSD: bcmgpio.4,v 1.3 2017/02/18 22:39:00 wiz Exp $
+.\"
+.\"Copyright (c) 2014 Frank Kardel
+.\"All rights reserved.
+.\"
+.\"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 FOUNDATION 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 February 17, 2017
+.Dt BCMGPIO 4
+.Os
+.Sh NAME
+.Nm bcmgpio
+.Nd driver for BCM2835 onboard gpio
+.Sh SYNOPSIS
+.Cd "bcmgpio0 at obio?"
+.Cd "bcmgpio1 at obio?"
+.Cd "gpio* at gpiobus?"
+.Sh DESCRIPTION
+The
+.Nm
+driver supports up to two instances.
+Access to the pins is provided by the
+.Xr gpio 4
+interface.
+The
+.Nm
+.Ar unitnumber
+argument selects the pin range.
+Unit 0 covers GPIO pins 0 through 31 and unit 1 covers pins 32
+through 53.
+GPIO pins being used in alternate configurations are not available
+for GPIO operations.
+.Sh SEE ALSO
+.Xr evbarm/intro 4 ,
+.Xr gpio 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 .