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SubjectRe: [PATCH] ARM: smp_twd: Reconfigure clockevents after cpufreq change

On 5/17/2011 4:51 AM, Colin Cross wrote:
> The localtimer's clock changes with the cpu clock. After a
> cpufreq transition, update the clockevent's frequency and
> reprogram the next clock event.
> Adds a clock called "smp_twd" that is used to determine the
> twd frequency, which can also be used at init time to
> avoid calibrating the twd frequency.
> Signed-off-by: Colin Cross<>
> Cc: Thomas Gleixner<>
> Cc: Russell King<>
> Cc: Santosh Shilimkar<>
> Cc: Rob Herring<>
> ---
> arch/arm/kernel/smp_twd.c | 69 +++++++++++++++++++++++++++++++++++++++++++--
> 1 files changed, 66 insertions(+), 3 deletions(-)
> This patch depends on Thomas Gleixner's patch to add clockevents_reconfigure
> See:
> This patch adds a clock that can be used to skip calibration as well
> as update the frequency. A later patch (or a later version of this patch)
> will drop twd_calibrate_rate once all platforms provide the necessary
> smp_twd clock.

Since the "smp_twd" clock node will not have a clk_set_rate()
associated with it, will the clk_get_rate() gives you real
rate. May be we can associate this node as a child of
CPU clock node and use the fixed divider based on peripheral
ratio. Is that the idea here to realize it ?


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