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[DRIVER][i.MX6][A62] Add SECO GPIO watchdog driver

Gianfranco Mariotti requested to merge seco_lf-5.10.y_watchdog_a62 into seco_lf-5.10.y

This is a generic driver for GPIO-based WDTs that use two GPIOs: enable and trigger. It is based on the linux GPIO-controlled Watchdog driver.

There exists another SECO driver that can be used for similar hardware, having the compatible name "seco,apx-wdog": that one initializes the watchdog earlier in the boot process, and so is used if that more complex use case is necessary.

Edited by Gianfranco Mariotti

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