Index: head/share/man/man4/owc.4
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 .\"
 .\" Copyright (c) 2015 M. Warner Losh
 .\" All rights reserved.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
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 .\" $FreeBSD$
 .\"
 .Dd June 26, 2019
 .Dt OWC 4
 .Os
 .Sh NAME
 .Nm owc
 .Nd Dallas Semiconductor 1-Wire Controller
 .Sh SYNOPSIS
 .Cd device owc
 .Sh DESCRIPTION
 The
 .Nm
 module implements Dallas Semiconductor 1-Wire signaling.
 It attaches the
 .Xr ow 4
 driver 1-Wire bus protocol.
 The
 .Nm
 device implements the Link Layer of the 1-Wire bus protocol stack.
 .Pp
 Bit banging a pin on a
 .Xr gpiobus 4
 is the only supported controller.
 Both standard and overdrive transfer timings are implemented.
 Strong pull-up functionality needed to support parasitic mode is not
 implemented.
 .Pp
 To enable 1-Wire for FDT systems requires modifying the DTS for your
 board to add something like:
 .Bd -literal
 / {
 	...
 	onewire {
 		compatible = "w1-gpio";
 		gpios = <&gpio 4 1>;
 	};
 	...
 };
 .Ed
 .Pp
 The gpios property describes the GPIO pin the 1-Wire bus is connected
 to.
 For more details about the
 .Va gpios
 property, please consult
 .Pa /usr/src/sys/dts/bindings-gpio.txt .
 .Pp
 On a
 .Xr device.hints 5
 based system these values are required for the
 .Nm :
 .Bl -tag -width ".Va hint.owc.%d.atXXX"
 .It Va hint.owc.%d.at
 The
 .Nm gpiobus
 you are attaching to.
 .It Va hint.owc.%d.pins
 This is a bitmask that defines a pin on the
 .Nm gpiobus
 that is to be used for the 1-Wire bus.
 For instance, to configure pin 10, use the bitmask of 0x400.
 Please note that this mask should have only one bit set
 (any other bits - i.e., pins - will be ignored).
+.El
 .Sh SEE ALSO
 .Xr gpiobus 4 ,
 .Xr ow 4 ,
 .Xr ow_temp 4 ,
 .Xr owll 9 ,
 .Xr own 9
 .Sh LEGAL
 .Tn 1-Wire
 is a registered trademark of Maxim Integrated Products, Inc.
 .Sh HISTORY
 The
 .Nm
 driver first appeared in
 .Fx 11.0 .
 .Sh AUTHORS
 The
 .Nm
 device driver and this manual page were written by
 .An Warner Losh .
 .Sh CAVEATS
 The gpio driver implements timing by busy waiting, which can cause a
 high load on slower systems.
 .Sh BUGS
 Overdrive mode has not actually been tested.