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Allwinner SoCs High Speed Timer Controller

Required properties:

- compatible :	should be "allwinner,sun5i-a13-hstimer" or
		"allwinner,sun7i-a20-hstimer"
- reg : Specifies base physical address and size of the registers.
- interrupts :	The interrupts of these timers (2 for the sun5i IP, 4 for the sun7i
		one)
- clocks: phandle to the source clock (usually the AHB clock)

Example:

timer@01c60000 {
	compatible = "allwinner,sun7i-a20-hstimer";
	reg = <0x01c60000 0x1000>;
	interrupts = <0 51 1>,
		     <0 52 1>,
		     <0 53 1>,
		     <0 54 1>;
	clocks = <&ahb1_gates 19>;
};

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