tjh.dev
Linux kernel mirror (for testing)
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1# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/interconnect/qcom,msm8998-bwmon.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Qualcomm Interconnect Bandwidth Monitor
8
9maintainers:
10 - Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
11
12description: |
13 Bandwidth Monitor measures current throughput on buses between various NoC
14 fabrics and provides information when it crosses configured thresholds.
15
16 Certain SoCs might have more than one Bandwidth Monitors, for example on SDM845::
17 - Measuring the bandwidth between CPUs and Last Level Cache Controller -
18 called just BWMON,
19 - Measuring the bandwidth between Last Level Cache Controller and memory
20 (DDR) - called LLCC BWMON.
21
22properties:
23 compatible:
24 oneOf:
25 - const: qcom,msm8998-bwmon # BWMON v4
26 - items:
27 - enum:
28 - qcom,sc7280-cpu-bwmon
29 - qcom,sc8280xp-cpu-bwmon
30 - qcom,sdm845-cpu-bwmon
31 - qcom,sm8550-cpu-bwmon
32 - const: qcom,sdm845-bwmon # BWMON v4, unified register space
33 - items:
34 - enum:
35 - qcom,sc8280xp-llcc-bwmon
36 - qcom,sm8550-llcc-bwmon
37 - const: qcom,sc7280-llcc-bwmon
38 - const: qcom,sc7280-llcc-bwmon # BWMON v5
39 - const: qcom,sdm845-llcc-bwmon # BWMON v5
40
41 interconnects:
42 maxItems: 1
43
44 interrupts:
45 maxItems: 1
46
47 operating-points-v2: true
48 opp-table:
49 type: object
50
51 reg:
52 # BWMON v5 uses one register address space, v1-v4 use one or two.
53 minItems: 1
54 maxItems: 2
55
56 reg-names:
57 minItems: 1
58 maxItems: 2
59
60required:
61 - compatible
62 - interconnects
63 - interrupts
64 - operating-points-v2
65 - opp-table
66 - reg
67
68additionalProperties: false
69
70allOf:
71 - if:
72 properties:
73 compatible:
74 const: qcom,msm8998-bwmon
75 then:
76 properties:
77 reg:
78 minItems: 2
79
80 reg-names:
81 items:
82 - const: monitor
83 - const: global
84
85 else:
86 properties:
87 reg:
88 maxItems: 1
89
90 reg-names:
91 maxItems: 1
92
93examples:
94 - |
95 #include <dt-bindings/interconnect/qcom,sdm845.h>
96 #include <dt-bindings/interrupt-controller/arm-gic.h>
97
98 pmu@1436400 {
99 compatible = "qcom,sdm845-cpu-bwmon", "qcom,sdm845-bwmon";
100 reg = <0x01436400 0x600>;
101 interrupts = <GIC_SPI 581 IRQ_TYPE_LEVEL_HIGH>;
102 interconnects = <&gladiator_noc MASTER_APPSS_PROC 3 &mem_noc SLAVE_LLCC 3>;
103
104 operating-points-v2 = <&cpu_bwmon_opp_table>;
105
106 cpu_bwmon_opp_table: opp-table {
107 compatible = "operating-points-v2";
108 opp-0 {
109 opp-peak-kBps = <4800000>;
110 };
111 opp-1 {
112 opp-peak-kBps = <9216000>;
113 };
114 opp-2 {
115 opp-peak-kBps = <15052800>;
116 };
117 opp-3 {
118 opp-peak-kBps = <20889600>;
119 };
120 opp-4 {
121 opp-peak-kBps = <25497600>;
122 };
123 };
124 };