[ARM] 4764/1: [AT91] AT91CAP9 core support

[linux-2.6-omap-h63xx.git] / arch / arm / mach-at91 / Kconfig

diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
index 05a9f8a1b45ee5320ddcf3c1d6f18aef96f326be..d12c616407d62a83374cacaa528523c48c824961 100644 (file)
--- a/arch/arm/mach-at91/Kconfig
+++ b/arch/arm/mach-at91/Kconfig
@@ -22,6 +22,9 @@ config ARCH_AT91SAM9263
 config ARCH_AT91SAM9RL
        bool "AT91SAM9RL"
 
+config ARCH_AT91CAP9
+       bool "AT91CAP9"
+
 config ARCH_AT91X40
        bool "AT91x40"
 
@@ -219,6 +222,22 @@ 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