I have RaspberryPI's 3 (running both Jessie and Stretch) and tested on both
In order to enable the watchdog timer, In many posts I saw that add in the /boot/config.txt a line with:
this would enable the watchdog in the device tree.
However, either I add the line or I don't add it, in the dmesg I see
bcm2835-wdt 3f100000.watchdog: Broadcom BCM2835 watchdog timer
The line does not appear in the dmesg only when I add:
So my question is Is the watchdog timer enabled by default?