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STM32 Independent WatchDoG (IWDG)
---------------------------------

Required properties:
- compatible: "st,stm32-iwdg"
- reg: physical base address and length of the registers set for the device
- clocks: must contain a single entry describing the clock input

Optional Properties:
- timeout-sec: Watchdog timeout value in seconds.

Example:

iwdg: watchdog@40003000 {
	compatible = "st,stm32-iwdg";
	reg = <0x40003000 0x400>;
	clocks = <&clk_lsi>;
	timeout-sec = <32>;
};