[ARM] 4646/1: AT91: configurable HZ, default to 128

This makes HZ configurable on AT91, following the model used on OMAP.

It defaults to a power of two on AT91rm9200 chips, avoiding rounding
errors which come from dividing a 32 KiHz clock to generate scheduler
irqs; and uses 100 on AT91sam926x chips, using MCK/16 (multi-MHZ).

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Remy Bhmer <linux@bohmer.net>
Acked-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a04f507e7f2c..93e40b65fd0b 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -657,6 +657,7 @@ config HZ
         default 128 if ARCH_L7200
         default 200 if ARCH_EBSA110 || ARCH_S3C2410
         default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
+        default AT91_TIMER_HZ if ARCH_AT91
         default 100
 
 config AEABI