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Draft: [DRIVER] seco: ectrl_stm32: add a convenient watchdog interface

Mikhail Vanyulin requested to merge seco_lf-5.10.y_develop_ectrl_stm32_wdt_interface into seco_lf-5.10.y

Rework the existing STM32 ectrl driver to enable standard watchdog API:
https://www.kernel.org/doc/Documentation/watchdog/watchdog-api.txt

As a result, a /dev/watchdogX device file will be created, and standard applications/daemons can be used to work with it.

Following functionality is implemented at the moment:

  • start watchdog;
  • stop watchdog;
  • ping watchdog to reset timer;
  • set watchdog timeout to particular value;
  • maximum timeout value is limited to 65 seconds;
  • minimum watchdog timeout value is limited by 0 second (infinite reboot cycle).

Notes:

  • STM32 does not reset the watchdog timer during software reset of C25 device. So, if watchdog timeout is set to a very small value (e.g. less 5 seconds), this can lead to constant board reset until a full power cycle will be performed;
  • U-Boot was modified to stop/disable a ticking watchdog timer during software reset in following MR: TBD.
Edited by Mikhail Vanyulin

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