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Commit 5da3e714 authored by Magnus Damm's avatar Magnus Damm Committed by Russell King
Browse files

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



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: default avatarMagnus Damm <damm@opensource.se>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 58c7d9d2

arch/arm/Kconfig

+1 −0
Original line number Original line Diff line number Diff line
@@ -1189,6 +1189,7 @@ config HZ 
	default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P6440 || ARCH_S5P6442 || ARCH_S5PV210

	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 OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER

	default AT91_TIMER_HZ if ARCH_AT91

	default AT91_TIMER_HZ if ARCH_AT91

	default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE

	default 100

	default 100





config THUMB2_KERNEL

config THUMB2_KERNEL

arch/arm/mach-shmobile/Kconfig

+12 −0
Original line number Original line Diff line number Diff line
@@ -70,6 +70,18 @@ endmenu 




menu "Timer and clock configuration"

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

config SH_TIMER_CMT

	bool "CMT timer driver"

	bool "CMT timer driver"

	default y

	default y