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[sfrench/cifs-2.6.git] / Documentation / devicetree / bindings / arm / pmu.txt
1 * ARM Performance Monitor Units
2
3 ARM cores often have a PMU for counting cpu and cache events like cache misses
4 and hits. The interface to the PMU is part of the ARM ARM. The ARM PMU
5 representation in the device tree should be done as under:-
6
7 Required properties:
8
9 - compatible : should be one of
10         "arm,armv8-pmuv3"
11         "arm,cortex-a17-pmu"
12         "arm,cortex-a15-pmu"
13         "arm,cortex-a12-pmu"
14         "arm,cortex-a9-pmu"
15         "arm,cortex-a8-pmu"
16         "arm,cortex-a7-pmu"
17         "arm,cortex-a5-pmu"
18         "arm,arm11mpcore-pmu"
19         "arm,arm1176-pmu"
20         "arm,arm1136-pmu"
21         "qcom,krait-pmu"
22 - interrupts : 1 combined interrupt or 1 per core. If the interrupt is a per-cpu
23                interrupt (PPI) then 1 interrupt should be specified.
24
25 Optional properties:
26
27 - qcom,no-pc-write : Indicates that this PMU doesn't support the 0xc and 0xd
28                      events.
29
30 Example:
31
32 pmu {
33         compatible = "arm,cortex-a9-pmu";
34         interrupts = <100 101>;
35 };