watchdog: armada_37xx: Fix compliance with kernel's driver
The Armada 37xx watchdog driver was recently accepted for mainline kernel by watchdog subsystem maintainer, but the driver works a little different than the one in U-Boot. This patch fixes this. In the previous implementation there was a tiny period of time when the watchdog was disabled and the system was vulnerables - this was during pinging, which was done by disabling, setting, and enabling the counter. Now pinging is done without disabling the watchdog. We use 2 counters: Counter 1 is the watchdog counter - on expiry, the system is reset. Counter 0 is used to reset Counter 1 to start counting from the set timeout again. So Counter 1 is set to be reset on Counter 0 expiry event event and pinging is done by forcing an immediate expiry event on Counter 0. Signed-off-by: NMarek Behún <marek.behun@nic.cz> Signed-off-by: NStefan Roese <sr@denx.de>
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