[mirror_ubuntu-bionic-kernel.git] / Documentation / devicetree / bindings / timer / brcm,bcm2835-system-timer.txt

BCM2835 System Timer

The System Timer peripheral provides four 32-bit timer channels and a
single 64-bit free running counter. Each channel has an output compare
register, which is compared against the 32 least significant bits of the
free running counter values, and generates an interrupt.

Required properties:

- compatible : should be "brcm,bcm2835-system-timer"
- reg : Specifies base physical address and size of the registers.
- interrupts : A list of 4 interrupt sinks; one per timer channel.
- clock-frequency : The frequency of the clock that drives the counter, in Hz.

Example:

timer {
	compatible = "brcm,bcm2835-system-timer";
	reg = <0x7e003000 0x1000>;
	interrupts = <1 0>, <1 1>, <1 2>, <1 3>;
	clock-frequency = <1000000>;
};
Commit	Line	Data
ee4af569 SA	1	BCM2835 System Timer
	2
	3	The System Timer peripheral provides four 32-bit timer channels and a
	4	single 64-bit free running counter. Each channel has an output compare
	5	register, which is compared against the 32 least significant bits of the
	6	free running counter values, and generates an interrupt.
	7
	8	Required properties:
	9
53f40352	10	- compatible : should be "brcm,bcm2835-system-timer"
ee4af569 SA	11	- reg : Specifies base physical address and size of the registers.
	12	- interrupts : A list of 4 interrupt sinks; one per timer channel.
	13	- clock-frequency : The frequency of the clock that drives the counter, in Hz.
	14
	15	Example:
	16
	17	timer {
	18	compatible = "brcm,bcm2835-system-timer";
	19	reg = <0x7e003000 0x1000>;
	20	interrupts = <1 0>, <1 1>, <1 2>, <1 3>;
	21	clock-frequency = <1000000>;
	22	};