Mention GPIO_PIN_PULLDOWN, GPIO_PIN_INVIN and GPIO_PIN_INVOUT; from OpenBSD.
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.\" $NetBSD: gpio.4,v 1.5 2008/01/09 15:52:20 xtraeme Exp $
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.\" $NetBSD: gpio.4,v 1.6 2008/01/09 16:15:41 xtraeme Exp $
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.\" $OpenBSD: gpio.4,v 1.5 2004/11/23 09:39:29 reyk Exp $
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.\"
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.\" Copyright (c) 2004 Alexander Yurchenko <grange@openbsd.org>
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@ -130,6 +130,12 @@ push-pull output
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output disabled
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.It Dv GPIO_PIN_PULLUP
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internal pull-up enabled
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.It Dv GPIO_PIN_PULLDOWN
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internal pull-down enabled
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.It Dv GPIO_PIN_INVIN
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invert input
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.It Dv GPIO_PIN_INVOUT
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invert output
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.El
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.Pp
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Note that the
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