watchdog: imx7ulp: Strictly follow the sequence for wdog operations

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According to reference manual, the i.MX7ULP WDOG's operations except
refresh should follow below sequence:

1. disable global interrupts;
2. unlock the wdog and wait unlock bit set;
3. reconfigure the wdog and wait for reconfiguration bit set;
4. enabel global interrupts.

Strictly follow the recommended sequence can make it more robust.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/1596150213-31638-1-git-send-email-Anson.Huang@nxp.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

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Anson Huang 2020-07-31 07:03:32 +08:00 • committed by Wim Van Sebroeck

parent beaabe0e23

commit 743949466e

1 changed files with 61 additions and 13 deletions

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drivers/watchdog/imx7ulp_wdt.c

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