1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/power/avs/qcom,cpr.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: Qualcomm Core Power Reduction (CPR)
8
9 maintainers:
10 - Niklas Cassel <nks@flawful.org>
11
12 description: |
13 CPR (Core Power Reduction) is a technology to reduce core power on a CPU
14 or other device. Each OPP of a device corresponds to a "corner" that has
15 a range of valid voltages for a particular frequency. While the device is
16 running at a particular frequency, CPR monitors dynamic factors such as
17 temperature, etc. and suggests adjustments to the voltage to save power
18 and meet silicon characteristic requirements.
19
20 properties:
21 compatible:
22 items:
23 - enum:
24 - qcom,qcs404-cpr
25 - const: qcom,cpr
26
27 reg:
28 description: Base address and size of the RBCPR register region.
29 maxItems: 1
30
31 interrupts:
32 maxItems: 1
33
34 clocks:
35 items:
36 - description: Reference clock.
37
38 clock-names:
39 items:
40 - const: ref
41
42 vdd-apc-supply:
43 description: APC regulator supply.
44
45 '#power-domain-cells':
46 const: 0
47
48 operating-points-v2:
49 description: |
50 A phandle to the OPP table containing the performance states
51 supported by the CPR power domain.
52
53 acc-syscon:
54 $ref: /schemas/types.yaml#/definitions/phandle
55 description: A phandle to the syscon used for writing ACC settings.
56
57 nvmem-cells:
58 items:
59 - description: Corner 1 quotient offset
60 - description: Corner 2 quotient offset
61 - description: Corner 3 quotient offset
62 - description: Corner 1 initial voltage
63 - description: Corner 2 initial voltage
64 - description: Corner 3 initial voltage
65 - description: Corner 1 quotient
66 - description: Corner 2 quotient
67 - description: Corner 3 quotient
68 - description: Corner 1 ring oscillator
69 - description: Corner 2 ring oscillator
70 - description: Corner 3 ring oscillator
71 - description: Fuse revision
72
73 nvmem-cell-names:
74 items:
75 - const: cpr_quotient_offset1
76 - const: cpr_quotient_offset2
77 - const: cpr_quotient_offset3
78 - const: cpr_init_voltage1
79 - const: cpr_init_voltage2
80 - const: cpr_init_voltage3
81 - const: cpr_quotient1
82 - const: cpr_quotient2
83 - const: cpr_quotient3
84 - const: cpr_ring_osc1
85 - const: cpr_ring_osc2
86 - const: cpr_ring_osc3
87 - const: cpr_fuse_revision
88
89 required:
90 - compatible
91 - reg
92 - interrupts
93 - clocks
94 - clock-names
95 - vdd-apc-supply
96 - '#power-domain-cells'
97 - operating-points-v2
98 - nvmem-cells
99 - nvmem-cell-names
100
101 additionalProperties: false
102
103 examples:
104 - |
105 #include <dt-bindings/interrupt-controller/arm-gic.h>
106
107 cpr_opp_table: opp-table-cpr {
108 compatible = "operating-points-v2-qcom-level";
109
110 cpr_opp1: opp1 {
111 opp-level = <1>;
112 qcom,opp-fuse-level = <1>;
113 };
114 cpr_opp2: opp2 {
115 opp-level = <2>;
116 qcom,opp-fuse-level = <2>;
117 };
118 cpr_opp3: opp3 {
119 opp-level = <3>;
120 qcom,opp-fuse-level = <3>;
121 };
122 };
123
124 power-controller@b018000 {
125 compatible = "qcom,qcs404-cpr", "qcom,cpr";
126 reg = <0x0b018000 0x1000>;
127 interrupts = <0 15 IRQ_TYPE_EDGE_RISING>;
128 clocks = <&xo_board>;
129 clock-names = "ref";
130 vdd-apc-supply = <&pms405_s3>;
131 #power-domain-cells = <0>;
132 operating-points-v2 = <&cpr_opp_table>;
133 acc-syscon = <&tcsr>;
134
135 nvmem-cells = <&cpr_efuse_quot_offset1>,
136 <&cpr_efuse_quot_offset2>,
137 <&cpr_efuse_quot_offset3>,
138 <&cpr_efuse_init_voltage1>,
139 <&cpr_efuse_init_voltage2>,
140 <&cpr_efuse_init_voltage3>,
141 <&cpr_efuse_quot1>,
142 <&cpr_efuse_quot2>,
143 <&cpr_efuse_quot3>,
144 <&cpr_efuse_ring1>,
145 <&cpr_efuse_ring2>,
146 <&cpr_efuse_ring3>,
147 <&cpr_efuse_revision>;
148 nvmem-cell-names = "cpr_quotient_offset1",
149 "cpr_quotient_offset2",
150 "cpr_quotient_offset3",
151 "cpr_init_voltage1",
152 "cpr_init_voltage2",
153 "cpr_init_voltage3",
154 "cpr_quotient1",
155 "cpr_quotient2",
156 "cpr_quotient3",
157 "cpr_ring_osc1",
158 "cpr_ring_osc2",
159 "cpr_ring_osc3",
160 "cpr_fuse_revision";
161 };
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