On 27/04/11(Wed) 14:21, Martin Pieuchot wrote: > On 27/04/11(Wed) 12:41, Martin Pieuchot wrote: > > On 26/04/11(Tue) 18:29, Martin Pieuchot wrote: > > > The following diff adds support for dfs. It requires my precedent patch > > > about GPIOs. I don't have a machine with a MPC7448 so it's only tested > > > with a MPC7447A. > > > > > > I'm also interested in various device-tree dumps for further development. > > > If you can send me yours, contact me off list. > > > > Updated diff, correct the voltage offset in case the value of the reg > > property is relative to the gpio controller offset.
Here is a manpage as required by jasper@, I'm not sure what to write or not to, feel free to comment/correct. Index: dfs.4 =================================================================== RCS file: dfs.4 diff -N dfs.4 --- /dev/null 1 Jan 1970 00:00:00 -0000 +++ dfs.4 1 May 2011 07:03:47 -0000 @@ -0,0 +1,54 @@ +.\" $OpenBSD$ +.\" +.\" Copyright (c) 2011 Martin Pieuchot <m...@nolizard.org> +.\" +.\" 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: April 30 2011 $ +.Dt DFS 4 macppc +.Os +.Sh NAME +.Nm dfs +.Nd Dynamic Frequence Switching +.Sh SYNOPSIS +.Cd "dfs* at macgpio?" +.Sh DESCRIPTION +The +.Nm +driver provides support for the +.Va "Dynamic Frequence Switching" +feature found on some PowerPC microprocessors. +.Pp +It allows to conserve power by lowering processor operating frequency. +Depending on the processor model, the processor-to-system bus ratio can +be either divided by two or four. +.Sh HARDWARE +Processors supported by the +.Nm +driver are part of the PowerPC G4 family and are found on various iBook +and PowerBook machines: +.Bd -literal -offset indent +MPC7447A PowerPC 7447 "Apollo 7" +MPC7448 PowerPC 7448 "Apollo 8" +.Ed +.Sh SEE ALSO +.Xr macgpio 4 , +.Xr sysctl 8 , +.Rs +.%T MPC7450 RISC Microprocessor Family Reference Manual +.Re +.Sh HISTORY +Support for the +.Nm +driver first appeared in +.Ox 5.0 .
