From: David Gibson <david@gibson.dropbear.id.au>
To: Paul Mackerras <paulus@samba.org>
Cc: Daniel Walker <dwalker@mvista.com>,
Thomas Gleixner <tglx@linutronix.de>,
Realtime Kernel <linux-rt-users@vger.kernel.org>,
linuxppc-dev@ozlabs.org
Subject: Re: [PATCH v2 2/4] Implement generic time of day clocksource for powerpc machines.
Date: Fri, 21 Sep 2007 16:43:21 +1000 [thread overview]
Message-ID: <20070921064321.GA13740@localhost.localdomain> (raw)
In-Reply-To: <18163.20403.967082.774118@cargo.ozlabs.ibm.com>
On Fri, Sep 21, 2007 at 02:59:31PM +1000, Paul Mackerras wrote:
> Daniel Walker writes:
>
> > I don't think the RTC frequency isn't the same as the timebase? Seems
> > like the RTC only case about seconds at the lowest level. If that's the
> > case then the jiffies clock might be better to use .. The other thing I
> > wonder is if the __USE_RTC boards might have lower level clocks that
> > could be used instead ..
>
> It's OK, the RTC isn't what you think it is, it's a pair of
> CPU-internal registers which count seconds and nanoseconds. On
> processors with the RTC, tb_ticks_per_sec is initialized to
> 1000000000. Trust me, this code is OK. :)
Indeed.. I'm wondering if we should do a s/rtc/ppc601rtc/ or
something. Otherwise people will keep making this mistake and be
confused.
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
next prev parent reply other threads:[~2007-09-21 6:43 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-21 3:26 [PATCH v2 1/4] Implement {read,update}_persistent_clock Tony Breeds
2007-09-21 3:26 ` [PATCH v2 2/4] Implement generic time of day clocksource for powerpc machines Tony Breeds
2007-09-21 4:05 ` Daniel Walker
2007-09-21 4:59 ` Paul Mackerras
2007-09-21 6:43 ` David Gibson [this message]
2007-09-21 4:52 ` Stephen Rothwell
2007-09-21 21:35 ` Tony Breeds
2007-09-21 21:35 ` [PATCH v3 " Tony Breeds
2007-10-03 0:48 ` Paul Mackerras
2007-10-03 4:00 ` Thomas Gleixner
2007-09-21 3:26 ` [PATCH v2 4/4] Enable tickless idle and high res timers for powerpc Tony Breeds
2007-09-21 3:26 ` [PATCH v2 3/4] Implement clockevents driver " Tony Breeds
2007-10-15 17:40 ` Sergei Shtylyov
2007-10-15 18:33 ` Sergei Shtylyov
2007-10-15 23:44 ` Paul Mackerras
2007-10-17 14:29 ` Sergei Shtylyov
2007-10-18 0:51 ` Paul Mackerras
2007-10-18 15:11 ` Sergei Shtylyov
2007-10-19 1:53 ` Paul Mackerras
2007-10-19 12:11 ` Sergei Shtylyov
2007-10-19 12:36 ` Paul Mackerras
2007-10-19 13:35 ` Sergei Shtylyov
2007-10-24 12:07 ` Sergei Shtylyov
2007-10-24 23:55 ` Paul Mackerras
2007-10-17 14:34 ` Sergei Shtylyov
2007-10-18 0:36 ` Paul Mackerras
2007-10-18 14:48 ` Sergei Shtylyov
2007-10-19 0:14 ` Paul Mackerras
2007-10-19 9:22 ` Gabriel Paubert
2007-10-19 11:22 ` Paul Mackerras
2007-10-19 11:49 ` Sergei Shtylyov
2007-10-19 12:24 ` Paul Mackerras
2007-09-26 19:04 ` [PATCH v2 1/4] Implement {read,update}_persistent_clock Steven Rostedt
2007-09-26 19:39 ` Sergei Shtylyov
2007-09-26 19:44 ` Steven Rostedt
2007-09-26 19:58 ` Thomas Gleixner
2007-10-15 18:05 ` Sergei Shtylyov
2007-10-15 23:46 ` Paul Mackerras
2007-10-16 1:19 ` Benjamin Herrenschmidt
2007-10-17 12:45 ` Sergei Shtylyov
2007-09-27 1:59 ` Benjamin Herrenschmidt
2007-10-15 18:07 ` Sergei Shtylyov
2007-10-15 23:02 ` Benjamin Herrenschmidt
2007-10-17 15:34 ` Sergei Shtylyov
2007-10-18 14:18 ` Sergei Shtylyov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20070921064321.GA13740@localhost.localdomain \
--to=david@gibson.dropbear.id.au \
--cc=dwalker@mvista.com \
--cc=linux-rt-users@vger.kernel.org \
--cc=linuxppc-dev@ozlabs.org \
--cc=paulus@samba.org \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).