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ARM: Allow selection HZ values

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Allow users to configure the Hz rate on implementations which do not have
a fixed clock rate.

Whenever HZ_FIXED is not set through one of its "default" settings, the
user is allowed to select a tick rate from 100, 200, 250, 300, 500Hz
and 1kHz.  This is slightly more choice than with the generic HZ
selection in kernel/Kconfig.hz (which only does 100, 250, 300Hz and
1kHz).  The reason for including 200Hz is that a greater number of other
platforms want that via the fixed rate, and 500Hz just seemed to be a
better middle value than 300Hz (which is of course very close to 250.)

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2013-04-27 23:31:10 +01:00
parent ff69a4c855
commit c9218b1639
1 changed files with 38 additions and 2 deletions
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40
arch/arm/Kconfig
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@ -1614,13 +1614,49 @@ config ARCH_NR_GPIO
source kernel/Kconfig.preempt
config HZ
config HZ_FIXED
int
default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \
ARCH_S5PV210 || ARCH_EXYNOS4
default AT91_TIMER_HZ if ARCH_AT91
default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
default 100
choice
depends on !HZ_FIXED
prompt "Timer frequency"
config HZ_100
bool "100 Hz"
config HZ_200
bool "200 Hz"
config HZ_250
bool "250 Hz"
config HZ_300
bool "300 Hz"
config HZ_500
bool "500 Hz"
config HZ_1000
bool "1000 Hz"
endchoice
config HZ
int
default HZ_FIXED if HZ_FIXED
default 100 if HZ_100
default 200 if HZ_200
default 250 if HZ_250
default 300 if HZ_300
default 500 if HZ_500
default 1000
config SCHED_HRTICK
def_bool HIGH_RES_TIMERS
config SCHED_HRTICK
def_bool HIGH_RES_TIMERS