m68knommu: improve the clock configuration defaults

Create some intelligent default settings for each ColdFire SoC type
in the configuration entry for CONFIG_CLOCK_FREQ.

The ColdFire clock frequency is configurable at build time. There is a
lot of variation in the frequency of operation on specific ColdFire based
boards. But we can choose a default that matches the maximum frequency
of clock operation for a particular ColdFire part. That is typically
the most common clock setting.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/arch/m68k/Kconfig.cpu b/arch/m68k/Kconfig.cpu
index 7da594994765..62f590e41880 100644
--- a/arch/m68k/Kconfig.cpu
+++ b/arch/m68k/Kconfig.cpu
@@ -418,6 +418,14 @@ config HAVE_IPSBAR
 
 config CLOCK_FREQ
         int "Set the core clock frequency"
+        default "25000000" if M5206
+        default "54000000" if M5206e
+        default "166666666" if M520x
+        default "140000000" if M5249
+        default "150000000" if M527x || M523x
+        default "90000000" if M5307
+        default "50000000" if M5407
+        default "266000000" if M54xx
         default "66666666"
         depends on COLDFIRE
         help