1.\" $NetBSD: bcmgpio.4,v 1.3 2017/02/18 22:39:00 wiz Exp $ 2.\" 3.\"Copyright (c) 2014 Frank Kardel 4.\"All rights reserved. 5.\" 6.\"Redistribution and use in source and binary forms, with or without 7.\"modification, are permitted provided that the following conditions 8.\"are met: 9.\"1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\"2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\"THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS 16.\"``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 17.\"TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 18.\"PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 19.\"BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20.\"CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21.\"SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22.\"INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23.\"CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24.\"ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25.\"POSSIBILITY OF SUCH DAMAGE. 26.\" 27.Dd February 17, 2017 28.Dt BCMGPIO 4 29.Os 30.Sh NAME 31.Nm bcmgpio 32.Nd driver for BCM2835 onboard gpio 33.Sh SYNOPSIS 34.Cd "bcmgpio0 at obio?" 35.Cd "bcmgpio1 at obio?" 36.Cd "gpio* at gpiobus?" 37.Sh DESCRIPTION 38The 39.Nm 40driver supports up to two instances. 41Access to the pins is provided by the 42.Xr gpio 4 43interface. 44The 45.Nm 46.Ar unitnumber 47argument selects the pin range. 48Unit 0 covers GPIO pins 0 through 31 and unit 1 covers pins 32 49through 53. 50GPIO pins being used in alternate configurations are not available 51for GPIO operations. 52.Sh SEE ALSO 53.Xr evbarm/intro 4 , 54.Xr gpio 4 55.Sh HISTORY 56The 57.Nm 58driver first appeared in 59.Nx 7.0 . 60.Sh AUTHORS 61.An -nosplit 62The 63.Nm 64driver was written by 65.An Frank Kardel Aq Mt kardel@NetBSD.org . 66