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This driver implements the HW WATCHDOG functions. Which needs to set CONFIG_HW_WATCHDOG to use them. This is disabled by default for mx7ulp. Use watchdog for reset cpu. Implement this in the driver. Need to define CONFIG_ULP_WATCHDOG to build it. Signed-off-by: Peng Fan <peng.fan@nxp.com> Signed-off-by: Ye Li <ye.li@nxp.com> Cc: Stefano Babic <sbabic@denx.de>