linux-kernel - High resolution timers on AT91SAM926x

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Date:	Sat, 1 Mar 2008 18:59:48 +0100
From:	"Bosko Radivojevic" <bosko.radivojevic@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: High resolution timers on AT91SAM926x

Hi!

 Is there a way to enable high resolution timers on AT91SAM926x? The
best resolution I can get (kernel 2.6.23.11-rt14 with at91 patch from
maxim.org.za) is around 1ms. Is there any other way to get timers with
better resolution?

When I enable CONFIG_GENERIC_TIME and CONFIG_GENERIC_CLOCKEVENTS (as
prerequisites for CONFIG_HIGH_RES) I'm unable to compile at91 part of
kernel.

Is there any "unofficial" patch? I saw that in 2.6.24 high res is
supported for ARM, but AT91 still lacks support.

$ cat /proc/timer_list
Timer List Version: v0.3
HRTIMER_MAX_CLOCK_BASES: 2
now at 11995813000 nsecs

cpu: 0
 clock 0:
  .index:      0
  .resolution: 999961 nsecs
  .get_time:   ktime_get_real
 active timers:
 clock 1:
  .index:      1
  .resolution: 999961 nsecs
  .get_time:   ktime_get
active timers:
 #0: <c388de9c>, it_real_fn, S:01
 # expires at 1207195374000 nsecs [in 1195199561000 nsecs]

Thanks!
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