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ARM: 6277/1: mach-shmobile: Allow users to select HZ, default to 128

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Introduce SHMOBILE_TIMER_HZ for SH-Mobile.

Allow users to select HZ on their system to
minimize potential timer drift. Use 128 Hz as
default to work well with the 32768 Hz RCLK.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Magnus Damm 2010-07-29 14:03:04 +01:00 committed by Russell King
parent 58c7d9d2e6
commit 5da3e714e3
2 changed files with 13 additions and 0 deletions
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1
arch/arm/Kconfig
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@ -1189,6 +1189,7 @@ config HZ
default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P6440 || ARCH_S5P6442 || ARCH_S5PV210
default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
default AT91_TIMER_HZ if ARCH_AT91
default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
default 100
config THUMB2_KERNEL

12
arch/arm/mach-shmobile/Kconfig
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@ -70,6 +70,18 @@ endmenu
menu "Timer and clock configuration"
config SHMOBILE_TIMER_HZ
int "Kernel HZ (jiffies per second)"
range 32 1024
default "128"
help
Allows the configuration of the timer frequency. It is customary
to have the timer interrupt run at 1000 Hz or 100 Hz, but in the
case of low timer frequencies other values may be more suitable.
SH-Mobile systems using a 32768 Hz RCLK for clock events may want
to select a HZ value such as 128 that can evenly divide RCLK.
A HZ value that does not divide evenly may cause timer drift.
config SH_TIMER_CMT
bool "CMT timer driver"
default y