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From: Scott Wood <scottwood@freescale.com>
To: Leon Woestenberg <leon.woestenberg@gmail.com>
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: High resolution timer support in 2.6.24+ for MPC831x?
Date: Thu, 14 Feb 2008 14:51:35 -0600	[thread overview]
Message-ID: <47B4A9D7.3030100@freescale.com> (raw)
In-Reply-To: <c384c5ea0802141226m630fcc11h60627cde75cb8b0e@mail.gmail.com>

Leon Woestenberg wrote:
> Hello all,
> 
> although I can enable high res timers in 2.6.24, the item note says it
> does nothing if the platform does not have support for it.
> 
> My platform is a MPC8313E-RDB, and I suspect no high res clock source
> implementation exists for it in 2.6.24, because
> clock_getres(CLOCK_REALTIME,) gives me 1/HZ.
> 
> Is this correct and/or is anything in the works?

The timebase/decrementer can be used as a high clock source on virtually 
all powerpc chips; I tried clock_getres(CLOCK_REALTIME) on an 8313erdb, 
and I got 1 ns.  Did you turn on CONFIG_HIGH_RES_TIMERS?

-Scott

  reply	other threads:[~2008-02-14 20:51 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-14 20:26 High resolution timer support in 2.6.24+ for MPC831x? Leon Woestenberg
2008-02-14 20:51 ` Scott Wood [this message]
2008-02-15 20:49   ` Leon Woestenberg
2008-02-16 12:44     ` Leon Woestenberg

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