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b3e90722f6
linux/drivers/clocksource
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Soren Brinkmann b3e90722f6 clocksource/cadence_ttc: Overhaul clocksource frequency adjustment 
The currently used method adjusting the clocksource to a changing input
frequency does not work on kernels from 3.11 on.
The new approach is to keep the timer frequency as constant as possible.
I.e.
 - due to the TTC's prescaler limitations, allow frequency changes
   only if the frequency scales by a power of 2
 - adjust the counter's divider on the fly when a frequency change
   occurs

This limits cpufreq to scale by certain factors only.
But we may keep the time base somewhat constant, so that sleep() & co
keep working as expected, while supporting cpufreq.

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Michal Simek <michal.simek@xilinx.com>
2014-03-11 23:10:03 +01:00
..
acpi_pm.c treewide: Fix printks with 0x%# 2013-08-27 10:49:38 +02:00
arm_arch_timer.c clocksource: arch_timer: Set dynamic irq affinity on mmio clockevent 2014-03-11 23:04:39 +01:00
arm_global_timer.c clocksource: arm_global_timer: Switch to sched_clock_register() 2013-12-11 11:40:23 +01:00
bcm2835_timer.c clocksource: bcm2835: Switch to sched_clock_register() 2013-07-30 11:24:51 -07:00
bcm_kona_timer.c clocksource: kona: Add basic use of external clock 2014-01-31 21:04:01 -08:00
cadence_ttc_timer.c clocksource/cadence_ttc: Overhaul clocksource frequency adjustment 2014-03-11 23:10:03 +01:00
clksrc-dbx500-prcmu.c clocksource: dbx500-prcmu: Switch to sched_clock_register() 2013-07-30 11:24:52 -07:00
clksrc-of.c Merge branch 'clockevents/3.14' of git://git.linaro.org/people/daniel.lezcano/linux into timers/core 2014-01-14 14:33:29 +01:00
cs5535-clockevt.c clocksource: misc drivers: Remove deprecated IRQF_DISABLED 2013-12-11 11:40:27 +01:00
cyclone.c
dummy_timer.c clocksource+irqchip: delete __cpuinit usage from all related files 2013-07-14 19:36:57 -04:00
dw_apb_timer_of.c clocksource: dw_apb_timer_of: Fix support for dts binding "snps,dw-apb-timer" 2013-12-10 19:49:18 +01:00
dw_apb_timer.c clocksource: misc drivers: Remove deprecated IRQF_DISABLED 2013-12-11 11:40:27 +01:00
em_sti.c clocksource: em_sti: convert to clk_prepare/unprepare 2013-10-22 22:36:24 +02:00
exynos_mct.c clocksource: mct: extend mct to support 8 local interrupts for Exynos5420 2013-12-16 04:47:34 +09:00
i8253.c time: Kill xtime_lock, replacing it with jiffies_lock 2012-11-13 14:08:23 -05:00
Kconfig clocksource: Add Kconfig entries for CMT, MTU2, TMU and STI 2014-03-11 23:05:15 +01:00
Makefile clocksource: timer-keystone: introduce clocksource driver for Keystone 2014-03-11 23:04:56 +01:00
metag_generic.c clocksource+irqchip: delete __cpuinit usage from all related files 2013-07-14 19:36:57 -04:00
mmio.c
moxart_timer.c ARM: clocksource: moxart: Add bitops.h include 2013-08-01 01:13:34 +02:00
mxs_timer.c clocksource: mxs_timer: Switch to sched_clock_register() 2013-07-30 11:24:52 -07:00
nomadik-mtu.c ARM: SoC DT updates for 3.14 2014-01-23 18:45:38 -08:00
samsung_pwm_timer.c clocksource: misc drivers: Remove deprecated IRQF_DISABLED 2013-12-11 11:40:27 +01:00
scx200_hrt.c
sh_cmt.c Merge branch 'clockevents/for-Simon-3.13-rc2' into clockevents/3.14 2013-12-18 15:14:36 +01:00
sh_mtu2.c Merge branch 'clockevents/3.14' of git://git.linaro.org/people/daniel.lezcano/linux into timers/core 2014-01-14 14:33:29 +01:00
sh_tmu.c Merge branch 'clockevents/3.14' of git://git.linaro.org/people/daniel.lezcano/linux into timers/core 2014-01-14 14:33:29 +01:00
sun4i_timer.c clocksource: sunxi: Add new compatibles 2014-03-11 23:04:46 +01:00
tcb_clksrc.c clocksource: tcb_clksrc: Remove IRQF_DISABLED 2013-10-03 16:28:40 +02:00
tegra20_timer.c clocksource: tegra: Remove deprecated IRQF_DISABLED 2013-12-11 11:40:28 +01:00
time-armada-370-xp.c clocksource: armada-370-xp: Use atomic access for shared registers 2014-03-11 23:05:05 +01:00
time-efm32.c clocksource: Provide timekeeping for efm32 SoCs 2013-10-22 22:36:33 +02:00
time-orion.c clocksource: orion: Use atomic access for shared registers 2014-03-11 23:05:02 +01:00
timer-keystone.c clocksource: timer-keystone: Delete unnecessary variable 2014-03-11 23:05:00 +01:00
timer-marco.c Now that we have a generic arch hook for broadcast we can remove the local 2013-07-23 16:54:15 -07:00
timer-prima2.c clocksource: sirf: Switch to sched_clock_register() and use 64 bits 2013-07-30 11:24:55 -07:00
timer-sun5i.c clocksource: Timer-sun5i: Switch to sched_clock_register() 2014-01-19 13:23:23 +01:00
timer-u300.c ARM: u300: move timer driver to clocksource 2014-03-11 23:04:43 +01:00
vf_pit_timer.c clocksource: vf_pit_timer: Switch to sched_clock_register() 2013-07-30 11:24:56 -07:00
vt8500_timer.c clocksource: vt8500: Remove deprecated IRQF_DISABLED 2013-12-11 11:40:28 +01:00
zevio-timer.c clocksource: Add TI-Nspire timer support 2013-06-06 17:23:13 +02:00