5 - compatible : should be "altr,timer-1.0"
6 - reg : Specifies base physical address and size of the registers.
7 - interrupt-parent: phandle of the interrupt controller
8 - interrupts : Should contain the timer interrupt number
9 - clock-frequency : The frequency of the clock that drives the counter, in Hz.
14 compatible = "altr,timer-1.0";
15 reg = <0x00400000 0x00000020>;
16 interrupt-parent = <&cpu>;
18 clock-frequency = <125000000>;