ubuntu-linux-kernel/Documentation/devicetree/bindings/watchdog/microchip,pic32-dmt.txt

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* Microchip PIC32 Deadman Timer
The deadman timer is used to reset the processor in the event of a software
malfunction. It is a free-running instruction fetch timer, which is clocked
whenever an instruction fetch occurs until a count match occurs.
Required properties:
- compatible: must be "microchip,pic32mzda-dmt".
- reg: physical base address of the controller and length of memory mapped
region.
- clocks: phandle of source clk. Should be <&rootclk PB7CLK>.
Example:
watchdog@1f800a00 {
compatible = "microchip,pic32mzda-dmt";
reg = <0x1f800a00 0x80>;
clocks = <&rootclk PB7CLK>;
};