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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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