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C-SKY Multi-processors Timer
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C-SKY multi-processors timer is designed for C-SKY SMP system and the
regs is accessed by cpu co-processor 4 registers with mtcr/mfcr.

 - PTIM_CTLR "cr<0, 14>" Control reg to start reset timer.
 - PTIM_TSR  "cr<1, 14>" Interrupt cleanup status reg.
 - PTIM_CCVR "cr<3, 14>" Current counter value reg.
 - PTIM_LVR  "cr<6, 14>" Window value reg to triger next event.

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timer node bindings definition
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	Description: Describes SMP timer

	PROPERTIES

	- compatible
		Usage: required
		Value type: <string>
		Definition: must be "csky,mptimer"
	- clocks
		Usage: required
		Value type: <node>
		Definition: must be input clk node
	- interrupts
		Usage: required
		Value type: <u32>
		Definition: must be timer irq num defined by soc

Examples:
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	timer: timer {
		compatible = "csky,mptimer";
		clocks = <&dummy_apb_clk>;
		interrupts = <16>;
		interrupt-parent = <&intc>;
	};