[PATCH] GTOD: add scx200 HRT clocksource

Add a GTOD clocksource driver based on the Geode SCx200's Hi-Res Timer.

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: john stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 15 insertions, 5 deletions

diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index db1f8b406063..374fb50608a0 100644
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -1050,13 +1050,23 @@ config SCx200
         tristate "NatSemi SCx200 support"
         depends on !X86_VOYAGER
         help
-          This provides basic support for the National Semiconductor SCx200
-          processor.  Right now this is just a driver for the GPIO pins.
+          This provides basic support for National Semiconductor's
+          (now AMD's) Geode processors.  The driver probes for the
+          PCI-IDs of several on-chip devices, so its a good dependency
+          for other scx200_* drivers.
 
-          If you don't know what to do here, say N.
+          If compiled as a module, the driver is named scx200.
 
-          This support is also available as a module.  If compiled as a
-          module, it will be called scx200.
+config SCx200HR_TIMER
+        tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
+        depends on SCx200 && GENERIC_TIME
+        default y
+        help
+          This driver provides a clocksource built upon the on-chip
+          27MHz high-resolution timer.  Its also a workaround for
+          NSC Geode SC-1100's buggy TSC, which loses time when the
+          processor goes idle (as is done by the scheduler).  The
+          other workaround is idle=poll boot option.
 
 source "drivers/pcmcia/Kconfig"