Messages in this thread | | | Date | Tue, 17 May 2011 19:30:29 +0530 | From | Santosh Shilimkar <> | Subject | Re: [PATCH] ARM: smp_twd: Reconfigure clockevents after cpufreq change |
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Colin,
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<ccross@android.com> > Cc: Thomas Gleixner<tglx@linutronix.de> > Cc: Russell King<linux@arm.linux.org.uk> > Cc: Santosh Shilimkar<santosh.shilimkar@ti.com> > Cc: Rob Herring<robherring2@gmail.com> > --- > 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: https://lkml.org/lkml/2011/5/13/122 > > 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 ?
Regards, Santosh
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