LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
* Re: High resolution timers on AT91SAM926x
@ 2008-03-01 22:57 David Brownell
  2008-03-03 10:26 ` Bosko Radivojevic
  0 siblings, 1 reply; 8+ messages in thread
From: David Brownell @ 2008-03-01 22:57 UTC (permalink / raw)
  To: Bosko Radivojevic; +Cc: lkml

> Is there a way to enable high resolution timers on AT91SAM926x?

Update PIT to support the clocksource/clockevent framework:
  http://marc.info/?l=linux-arm-kernel&m=119940724711435&w=2

Declare timer/counter block platform devices:
  http://marc.info/?l=linux-arm-kernel&m=120302318811110&w=2

Use timer/counter blocks for better clocksource and clockevents:
  http://marc.info/?l=linux-kernel&m=120373043520279&w=2
  http://marc.info/?l=linux-kernel&m=120373063320487&w=2

The focus in that last patch is on NO_HZ support -- so the
clockevents run at 32 KiHz (about 31 usec precision for HRT)
to allow overall HZ to run below 1 where practical.   If you
need even higher precision, you could update that clockevent
code to use a different base clock.

Those last two patches are in some MM tree, and Haavard has
some updates to then (which don't much affect functionality).

I understand the upcoming 2.6.24-at91 patch will include the
first two patches.

- Dave

^ permalink raw reply	[flat|nested] 8+ messages in thread

end of thread, other threads:[~2008-03-04 20:55 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
     [not found] <d6c8ef150803010952g666118dfu7679593b3c92c8be@mail.gmail.com>
2008-03-01 17:59 ` High resolution timers on AT91SAM926x Bosko Radivojevic
2008-03-01 22:57 David Brownell
2008-03-03 10:26 ` Bosko Radivojevic
2008-03-03 18:39   ` David Brownell
2008-03-03 21:42     ` Bosko Radivojevic
2008-03-04  1:29       ` David Brownell
2008-03-04 20:22         ` Remy Bohmer
2008-03-04 20:55           ` Wolfgang Grandegger

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).