ubuntu-linux-kernel/Documentation/devicetree/bindings/watchdog/sigma,smp8642-wdt.txt

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Sigma Designs SMP86xx/SMP87xx watchdog
Required properties:
- compatible: Should be "sigma,smp8642-wdt"
- reg: Specifies the physical address region
- clocks: Should be a phandle to the clock
Optional properties:
- timeout-sec: watchdog timeout in seconds
Example:
watchdog@1fd00 {
compatible = "sigma,smp8642-wdt";
reg = <0x1fd00 8>;
clocks = <&xtal_in_clk>;
timeout-sec = <30>;
};