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docs: watchdog: mlx-wdt: Add description of new watchdog type 3 

Add documentation with details of new type of Mellanox watchdog driver.

Signed-off-by: Michael Shych <michaelsh@mellanox.com>
Reviewed-by: Vadim Pasternak <vadimp@mellanox.com>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20200504141427.17685-5-michaelsh@mellanox.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
This commit is contained in:
Michael Shych 2020-05-04 17:14:27 +03:00 committed by Wim Van Sebroeck
parent eee851143b
commit d6e6d5627f
1 changed files with 10 additions and 0 deletions
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Documentation/watchdog/mlx-wdt.rst
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@ -24,10 +24,19 @@ Type 2:
Maximum timeout is 255 sec.
Get time-left is supported.
Type 3:
Same as Type 2 with extended maximum timeout period.
Maximum timeout is 65535 sec.
Type 1 HW watchdog implementation exist in old systems and
all new systems have type 2 HW watchdog.
Two types of HW implementation have also different register map.
Type 3 HW watchdog implementation can exist on all Mellanox systems
with new programmer logic device.
It's differentiated by WD capability bit.
Old systems still have only one main watchdog.
Mellanox system can have 2 watchdogs: main and auxiliary.
Main and auxiliary watchdog devices can be enabled together
on the same system.
@ -54,3 +63,4 @@ The driver checks during initialization if the previous system reset
was done by the watchdog. If yes, it makes a notification about this event.
Access to HW registers is performed through a generic regmap interface.
Programmable logic device registers have little-endian order.