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Move mfokclock(4) from loongson to sys/dev/i2c so that it be used by more
platforms than just loongson.  Rename it to mfokrtc(4) for consistency with
other RTC drivers.  Make it match on st,m41t83, since that was the chip for
which the driver was written for.  More compatible strings can be added for
each chip of the series verified to behave the same.

Discussed with kettenis@
Compile tested on loongson by kn@
Tested on loongson by and ok visa@

.\"	$OpenBSD: mfokrtc.4,v 1.1 2020/09/30 22:23:40 patrick Exp $
.\"
.\" Copyright (c) 2010 Miodrag Vallat.
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: September 30 2020 $
.Dt MFOKRTC 4
.Os
.Sh NAME
.Nm mfokrtc
.Nd M41T8x real-time clock
.Sh SYNOPSIS
.Cd "mfokrtc* at iic? addr 0x68"
.Sh DESCRIPTION
The
.Nm
driver supports two-wire real-time clock chips of the M41T8x family.
.Sh SEE ALSO
.Xr iic 4 ,
.Xr intro 4