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Cortina Systems Gemini SoC Watchdog

Required properties:
- compatible : must be "cortina,gemini-watchdog"
- reg : shall contain base register location and length
- interrupts : shall contain the interrupt for the watchdog

Optional properties:
- timeout-sec : the default watchdog timeout in seconds.

Example:

watchdog@41000000 {
	compatible = "cortina,gemini-watchdog";
	reg = <0x41000000 0x1000>;
	interrupts = <3 IRQ_TYPE_LEVEL_HIGH>;
};