---

yaml
---
r: 77422
b: refs/heads/master
c: 5248c65
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 156864f806baa4e1aa6eabd28ac45ecc92b31315
+refs/heads/master: 5248c657898c018bcd23ef77759fa1d6c690bdf4

trunk/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

trunk/arch/arm/mach-at91/Kconfig

@@ -219,6 +219,22 @@ config AT91_PROGRAMMABLE_CLOCKS
 	  Select this if you need to program one or more of the PCK0..PCK3
 	  programmable clock outputs.
 
+config AT91_TIMER_HZ
+       int "Kernel HZ (jiffies per second)"
+       range 32 1024
+       depends on ARCH_AT91
+       default "128" if ARCH_AT91RM9200
+       default "100"
+       help
+	  On AT91rm9200 chips where you're using a system clock derived
+	  from the 32768 Hz hardware clock, this tick rate should divide
+	  it exactly: use a power-of-two value, such as 128 or 256, to
+	  reduce timing errors caused by rounding.
+
+	  On AT91sam926x chips, or otherwise when using a higher precision
+	  system clock (of at least several MHz), rounding is less of a
+	  problem so it can be safer to use a decimal values like 100.
+
 endmenu
 
 endif