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Date: Thu, 16 Sep 2004 09:30:09 -0700 (PDT)
From: Christoph Lameter <clameter@sgi.com>
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To: Jesse Barnes <jbarnes@engr.sgi.com>
cc: Bjorn Helgaas <bjorn.helgaas@hp.com>, linux-kernel@vger.kernel.org,
       Bob Picco <Robert.Picco@hp.com>, venkatesh.pallipadi@intel.com
Subject: Re: device driver for the SGI system clock, mmtimer
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On Thu, 16 Sep 2004, Jesse Barnes wrote:

> > As far as I can see, drivers/char/hpet.c talks to the same hardware.
> > HP sx1000 machines (and probably others) also implement the HPET.
>
> No, it's different hardware.
>
> > I think you should look at adding your functionality to hpet.c
> > rather than adding a new driver.
>
> I think Christoph already looked at that.  And HPET doesn't provide mmap
> functionality, does it?  I.e. allow a userspace program to dereference the
> counter register directly?

HPET also allows mmaping to userspace.