Messages in this thread | | | From | David Brownell <> | Subject | Re: High resolution timers on AT91SAM926x | Date | Sat, 1 Mar 2008 14:57:40 -0800 |
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> 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
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