1*4882a593SmuzhiyunBCM2835 System Timer 2*4882a593Smuzhiyun 3*4882a593SmuzhiyunThe System Timer peripheral provides four 32-bit timer channels and a 4*4882a593Smuzhiyunsingle 64-bit free running counter. Each channel has an output compare 5*4882a593Smuzhiyunregister, which is compared against the 32 least significant bits of the 6*4882a593Smuzhiyunfree running counter values, and generates an interrupt. 7*4882a593Smuzhiyun 8*4882a593SmuzhiyunRequired properties: 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun- compatible : should be "brcm,bcm2835-system-timer" 11*4882a593Smuzhiyun- reg : Specifies base physical address and size of the registers. 12*4882a593Smuzhiyun- interrupts : A list of 4 interrupt sinks; one per timer channel. 13*4882a593Smuzhiyun- clock-frequency : The frequency of the clock that drives the counter, in Hz. 14*4882a593Smuzhiyun 15*4882a593SmuzhiyunExample: 16*4882a593Smuzhiyun 17*4882a593Smuzhiyuntimer { 18*4882a593Smuzhiyun compatible = "brcm,bcm2835-system-timer"; 19*4882a593Smuzhiyun reg = <0x7e003000 0x1000>; 20*4882a593Smuzhiyun interrupts = <1 0>, <1 1>, <1 2>, <1 3>; 21*4882a593Smuzhiyun clock-frequency = <1000000>; 22*4882a593Smuzhiyun}; 23