[WATCHDOG] clean-up watchdog documentation

Random sampling of some URLs in the Documentation tree to see how many were
stale found that one watchdog driver was now a porn site.  In fact if the
watchdogs document directory was any older it would be written in latin

Clean it up somewhat and add Last reviewed headers, something all the
Documentation could do with IMHO.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 43 insertions, 0 deletions

diff --git a/Documentation/watchdog/wdt.txt b/Documentation/watchdog/wdt.txt
new file mode 100644
index 000000000000..03fd756d976d
--- /dev/null
+++ b/Documentation/watchdog/wdt.txt
@@ -0,0 +1,43 @@
+Last Reviewed: 10/05/2007
+
+        WDT Watchdog Timer Interfaces For The Linux Operating System
+                Alan Cox <alan@lxorguk.ukuu.org.uk>
+
+        ICS     WDT501-P
+        ICS     WDT501-P (no fan tachometer)
+        ICS     WDT500-P
+
+All the interfaces provide /dev/watchdog, which when open must be written
+to within a timeout or the machine will reboot. Each write delays the reboot
+time another timeout. In the case of the software watchdog the ability to
+reboot will depend on the state of the machines and interrupts. The hardware
+boards physically pull the machine down off their own onboard timers and
+will reboot from almost anything.
+
+A second temperature monitoring interface is available on the WDT501P cards
+This provides /dev/temperature. This is the machine internal temperature in
+degrees Fahrenheit. Each read returns a single byte giving the temperature.
+
+The third interface logs kernel messages on additional alert events.
+
+The wdt card cannot be safely probed for. Instead you need to pass
+wdt=ioaddr,irq as a boot parameter - eg "wdt=0x240,11".
+
+Features
+--------
+                WDT501P         WDT500P
+Reboot Timer       X               X
+External Reboot    X               X
+I/O Port Monitor   o               o
+Temperature        X               o
+Fan Speed          X               o
+Power Under        X               o
+Power Over         X               o
+Overheat           X               o
+
+The external event interfaces on the WDT boards are not currently supported.
+Minor numbers are however allocated for it.
+
+
+Example Watchdog Driver:  see Documentation/watchdog/src/watchdog-simple.c
+