xref: /linux/Documentation/devicetree/bindings/devfreq/event/samsung,exynos-ppmu.yaml (revision 24bce201d79807b668bf9d9e0aca801c5c0d5f78) 
1# SPDX-License-Identifier: GPL-2.0
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/devfreq/event/samsung,exynos-ppmu.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Samsung Exynos SoC PPMU (Platform Performance Monitoring Unit)
8
9maintainers:
10  - Chanwoo Choi <cw00.choi@samsung.com>
11  - Krzysztof Kozlowski <krzk@kernel.org>
12
13description: |
14  The Samsung Exynos SoC has PPMU (Platform Performance Monitoring Unit) for
15  each IP. PPMU provides the primitive values to get performance data. These
16  PPMU events provide information of the SoC's behaviors so that you may use to
17  analyze system performance, to make behaviors visible and to count usages of
18  each IP (DMC, CPU, RIGHTBUS, LEFTBUS, CAM interface, LCD, G3D, MFC).  The
19  Exynos PPMU driver uses the devfreq-event class to provide event data to
20  various devfreq devices. The devfreq devices would use the event data when
21  derterming the current state of each IP.
22
23properties:
24  compatible:
25    enum:
26      - samsung,exynos-ppmu
27      - samsung,exynos-ppmu-v2
28
29  clock-names:
30    items:
31      - const: ppmu
32
33  clocks:
34    maxItems: 1
35
36  reg:
37    maxItems: 1
38
39  events:
40    type: object
41
42    patternProperties:
43      '^ppmu-event[0-9]+(-[a-z0-9]+){,2}$':
44        type: object
45        properties:
46          event-name:
47            description: |
48              The unique event name among PPMU device
49            $ref: /schemas/types.yaml#/definitions/string
50
51          event-data-type:
52            description: |
53              Define the type of data which shell be counted by the counter.
54              You can check include/dt-bindings/pmu/exynos_ppmu.h for all
55              possible type, i.e. count read requests, count write data in
56              bytes, etc.  This field is optional and when it is missing, the
57              driver code will use default data type.
58            $ref: /schemas/types.yaml#/definitions/uint32
59
60        required:
61          - event-name
62
63        additionalProperties: false
64
65    additionalProperties: false
66
67required:
68  - compatible
69  - reg
70
71additionalProperties: false
72
73examples:
74  - |
75    // PPMUv1 nodes for Exynos3250 (although the board DTS defines events)
76    #include <dt-bindings/clock/exynos3250.h>
77
78    ppmu_dmc0: ppmu@106a0000 {
79        compatible = "samsung,exynos-ppmu";
80        reg = <0x106a0000 0x2000>;
81
82        events {
83            ppmu_dmc0_3: ppmu-event3-dmc0 {
84                event-name = "ppmu-event3-dmc0";
85            };
86
87            ppmu_dmc0_2: ppmu-event2-dmc0 {
88                event-name = "ppmu-event2-dmc0";
89            };
90
91            ppmu_dmc0_1: ppmu-event1-dmc0 {
92                event-name = "ppmu-event1-dmc0";
93            };
94
95            ppmu_dmc0_0: ppmu-event0-dmc0 {
96                event-name = "ppmu-event0-dmc0";
97            };
98        };
99    };
100
101    ppmu_rightbus: ppmu@112a0000 {
102        compatible = "samsung,exynos-ppmu";
103        reg = <0x112a0000 0x2000>;
104        clocks = <&cmu CLK_PPMURIGHT>;
105        clock-names = "ppmu";
106
107        events {
108            ppmu_rightbus_3: ppmu-event3-rightbus {
109                event-name = "ppmu-event3-rightbus";
110            };
111        };
112    };
113
114  - |
115    // PPMUv2 nodes in Exynos5433
116    ppmu_d0_cpu: ppmu@10480000 {
117        compatible = "samsung,exynos-ppmu-v2";
118        reg = <0x10480000 0x2000>;
119    };
120
121    ppmu_d0_general: ppmu@10490000 {
122        compatible = "samsung,exynos-ppmu-v2";
123        reg = <0x10490000 0x2000>;
124
125        events {
126            ppmu_event0_d0_general: ppmu-event0-d0-general {
127                event-name = "ppmu-event0-d0-general";
128            };
129        };
130    };
131
132    ppmu_d0_rt: ppmu@104a0000 {
133        compatible = "samsung,exynos-ppmu-v2";
134        reg = <0x104a0000 0x2000>;
135    };
136
137    ppmu_d1_cpu: ppmu@104b0000 {
138        compatible = "samsung,exynos-ppmu-v2";
139        reg = <0x104b0000 0x2000>;
140    };
141
142    ppmu_d1_general: ppmu@104c0000 {
143        compatible = "samsung,exynos-ppmu-v2";
144        reg = <0x104c0000 0x2000>;
145    };
146
147    ppmu_d1_rt: ppmu@104d0000 {
148        compatible = "samsung,exynos-ppmu-v2";
149        reg = <0x104d0000 0x2000>;
150    };
151
152  - |
153    // PPMUv1 nodes with event-data-type for Exynos4412
154    #include <dt-bindings/pmu/exynos_ppmu.h>
155
156    ppmu@106a0000 {
157        compatible = "samsung,exynos-ppmu";
158        reg = <0x106a0000 0x2000>;
159        clocks = <&clock 400>;
160        clock-names = "ppmu";
161
162        events {
163            ppmu-event3-dmc0 {
164                event-name = "ppmu-event3-dmc0";
165                event-data-type = <(PPMU_RO_DATA_CNT |
166                                    PPMU_WO_DATA_CNT)>;
167            };
168        };
169    };
170