watchdog: xilinx_wwdt: Add Versal window watchdog support

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Versal watchdog driver uses window watchdog mode. Window watchdog
timer(WWDT) contains closed(first) and open(second) window with
32 bit width. Write to the watchdog timer within predefined window
periods of time. This means a period that is not too soon and a
period that is not too late. The WWDT has to be restarted within
the open window time. If software tries to restart WWDT outside of
the open window time period, it generates a reset.

Signed-off-by: Srinivas Neeli <srinivas.neeli@amd.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lkml.kernel.org/r/20230420104231.2243079-4-srinivas.neeli@amd.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

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Srinivas Neeli 2023-04-20 16:12:30 +05:30 • committed by Wim Van Sebroeck

parent be0d0ab1c7

commit 12984cea1b

3 changed files with 220 additions and 0 deletions

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18

drivers/watchdog/Kconfig

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1

drivers/watchdog/Makefile

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201

drivers/watchdog/xilinx_wwdt.c

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