1
2* Samsung Exynos PPMU (Platform Performance Monitoring Unit) device
3
4The Samsung Exynos SoC has PPMU (Platform Performance Monitoring Unit) for
5each IP. PPMU provides the primitive values to get performance data. These
6PPMU events provide information of the SoC's behaviors so that you may
7use to analyze system performance, to make behaviors visible and to count
8usages of each IP (DMC, CPU, RIGHTBUS, LEFTBUS, CAM interface, LCD, G3D, MFC).
9The Exynos PPMU driver uses the devfreq-event class to provide event data
10to various devfreq devices. The devfreq devices would use the event data when
11derterming the current state of each IP.
12
13Required properties:
14- compatible: Should be "samsung,exynos-ppmu".
15- reg: physical base address of each PPMU and length of memory mapped region.
16
17Optional properties:
18- clock-names : the name of clock used by the PPMU, "ppmu"
19- clocks : phandles for clock specified in "clock-names" property
20- #clock-cells: should be 1.
21
22Example1 : PPMU nodes in exynos3250.dtsi are listed below.
23
24		ppmu_dmc0: ppmu_dmc0@106a0000 {
25			compatible = "samsung,exynos-ppmu";
26			reg = <0x106a0000 0x2000>;
27			status = "disabled";
28		};
29
30		ppmu_dmc1: ppmu_dmc1@106b0000 {
31			compatible = "samsung,exynos-ppmu";
32			reg = <0x106b0000 0x2000>;
33			status = "disabled";
34		};
35
36		ppmu_cpu: ppmu_cpu@106c0000 {
37			compatible = "samsung,exynos-ppmu";
38			reg = <0x106c0000 0x2000>;
39			status = "disabled";
40		};
41
42		ppmu_rightbus: ppmu_rightbus@112a0000 {
43			compatible = "samsung,exynos-ppmu";
44			reg = <0x112a0000 0x2000>;
45			clocks = <&cmu CLK_PPMURIGHT>;
46			clock-names = "ppmu";
47			status = "disabled";
48		};
49
50		ppmu_leftbus: ppmu_leftbus0@116a0000 {
51			compatible = "samsung,exynos-ppmu";
52			reg = <0x116a0000 0x2000>;
53			clocks = <&cmu CLK_PPMULEFT>;
54			clock-names = "ppmu";
55			status = "disabled";
56		};
57
58Example2 : Events of each PPMU node in exynos3250-rinato.dts are listed below.
59
60	&ppmu_dmc0 {
61		status = "okay";
62
63		events {
64			ppmu_dmc0_3: ppmu-event3-dmc0 {
65				event-name = "ppmu-event3-dmc0";
66			};
67
68			ppmu_dmc0_2: ppmu-event2-dmc0 {
69				event-name = "ppmu-event2-dmc0";
70			};
71
72			ppmu_dmc0_1: ppmu-event1-dmc0 {
73				event-name = "ppmu-event1-dmc0";
74			};
75
76			ppmu_dmc0_0: ppmu-event0-dmc0 {
77				event-name = "ppmu-event0-dmc0";
78			};
79		};
80	};
81
82	&ppmu_dmc1 {
83		status = "okay";
84
85		events {
86			ppmu_dmc1_3: ppmu-event3-dmc1 {
87				event-name = "ppmu-event3-dmc1";
88			};
89		};
90	};
91
92	&ppmu_leftbus {
93		status = "okay";
94
95		events {
96			ppmu_leftbus_3: ppmu-event3-leftbus {
97				event-name = "ppmu-event3-leftbus";
98			};
99		};
100	};
101
102	&ppmu_rightbus {
103		status = "okay";
104
105		events {
106			ppmu_rightbus_3: ppmu-event3-rightbus {
107				event-name = "ppmu-event3-rightbus";
108			};
109		};
110	};
111