[linux-2.6-block.git] / Documentation / devicetree / bindings / cpufreq / cpufreq-spear.txt

SPEAr cpufreq driver
-------------------

SPEAr SoC cpufreq driver for CPU frequency scaling.
It supports both uniprocessor (UP) and symmetric multiprocessor (SMP) systems
which share clock across all CPUs.

Required properties:
- cpufreq_tbl: Table of frequencies CPU could be transitioned into, in the
  increasing order.

Optional properties:
- clock-latency: Specify the possible maximum transition latency for clock, in
  unit of nanoseconds.

Both required and optional properties listed above must be defined under node
/cpus/cpu@0.

Examples:
--------
cpus {

	<...>

	cpu@0 {
		compatible = "arm,cortex-a9";
		reg = <0>;

		<...>

		cpufreq_tbl = < 166000
				200000
				250000
				300000
				400000
				500000
				600000 >;
	};

	<...>

};
Commit	Line	Data
42099322 DS	1	SPEAr cpufreq driver
	2	-------------------
	3
	4	SPEAr SoC cpufreq driver for CPU frequency scaling.
	5	It supports both uniprocessor (UP) and symmetric multiprocessor (SMP) systems
	6	which share clock across all CPUs.
	7
	8	Required properties:
	9	- cpufreq_tbl: Table of frequencies CPU could be transitioned into, in the
	10	increasing order.
	11
	12	Optional properties:
	13	- clock-latency: Specify the possible maximum transition latency for clock, in
	14	unit of nanoseconds.
	15
	16	Both required and optional properties listed above must be defined under node
	17	/cpus/cpu@0.
	18
	19	Examples:
	20	--------
	21	cpus {
	22
	23	<...>
	24
	25	cpu@0 {
	26	compatible = "arm,cortex-a9";
	27	reg = <0>;
	28
	29	<...>
	30
	31	cpufreq_tbl = < 166000
	32	200000
	33	250000
	34	300000
	35	400000
	36	500000
	37	600000 >;
	38	};
	39
	40	<...>
	41
	42	};