1 # SPDX-License-Identifier: GPL-2.0
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/power/power
5 $schema: http://devicetree.org/meta-schemas/co
6
7 title: Generic PM domains
8
9 maintainers:
10 - Rafael J. Wysocki <rjw@rjwysocki.net>
11 - Kevin Hilman <khilman@kernel.org>
12 - Ulf Hansson <ulf.hansson@linaro.org>
13
14 description: |+
15 System on chip designs are often divided int
16 used for power gating of selected IP blocks
17 leakage current. Moreover, in some cases the
18 capable of scaling performance for a group o
19
20 This device tree binding can be used to bind
21 their PM domains provided by PM domain provi
22 represented by any node in the device tree a
23 domains. A consumer node can refer to the pr
24 phandle arguments (so called PM domain speci
25 \#power-domain-cells property in the PM doma
26
27 properties:
28 $nodename:
29 pattern: "^(power-controller|power-domain|
30
31 domain-idle-states:
32 $ref: /schemas/types.yaml#/definitions/pha
33 items:
34 maxItems: 1
35 description: |
36 Phandles of idle states that defines the
37 power-domain provider. The idle state de
38 domain-idle-state bindings, specified in
39
40 Note that, the domain-idle-state propert
41 PM domain and not the idle states of the
42 domain. Devices and sub-domains have the
43 the parent domain's idle states. In the
44 domain would be considered as capable of
45
46 operating-points-v2:
47 description:
48 Phandles to the OPP tables of power doma
49 performance, provided by a power domain
50 a single power domain only or all the po
51 provider have identical OPP tables, then
52 phandle. Refer to ../opp/opp-v2-base.yam
53
54 "#power-domain-cells":
55 description:
56 Number of cells in a PM domain specifier
57 representing a single PM domain and 1 fo
58 domains (e.g. power controllers), but ca
59 by device tree binding documentation of
60
61 power-domains:
62 description:
63 A phandle and PM domain specifier as def
64 controller specified by phandle. Some po
65 from another power domain (or have other
66 dependencies). For representing such dep
67 consumer binding is used. When provided,
68 by the given provider should be subdomai
69 by this binding.
70
71 required:
72 - "#power-domain-cells"
73
74 additionalProperties: true
75
76 examples:
77 - |
78 power: power-controller@12340000 {
79 compatible = "foo,power-controller";
80 reg = <0x12340000 0x1000>;
81 #power-domain-cells = <1>;
82 };
83
84 // The node above defines a power controll
85 // expects one cell as its phandle argumen
86
87 - |
88 parent2: power-controller@12340000 {
89 compatible = "foo,power-controller";
90 reg = <0x12340000 0x1000>;
91 #power-domain-cells = <1>;
92 };
93
94 child2: power-controller@12341000 {
95 compatible = "foo,power-controller";
96 reg = <0x12341000 0x1000>;
97 power-domains = <&parent2 0>;
98 #power-domain-cells = <1>;
99 };
100
101 // The nodes above define two power contro
102 // Domains created by the 'child' power co
103 // domain provided by the 'parent' power c
104
105 - |
106 parent3: power-controller@12340000 {
107 compatible = "foo,power-controller";
108 reg = <0x12340000 0x1000>;
109 #power-domain-cells = <0>;
110 domain-idle-states = <&DOMAIN_RET>, <&
111 };
112
113 child3: power-controller@12341000 {
114 compatible = "foo,power-controller";
115 reg = <0x12341000 0x1000>;
116 power-domains = <&parent3>;
117 #power-domain-cells = <0>;
118 domain-idle-states = <&DOMAIN_PWR_DN>;
119 };
120
121 domain-idle-states {
122 DOMAIN_RET: domain-retention {
123 compatible = "domain-idle-state";
124 entry-latency-us = <1000>;
125 exit-latency-us = <2000>;
126 min-residency-us = <10000>;
127 };
128
129 DOMAIN_PWR_DN: domain-pwr-dn {
130 compatible = "domain-idle-state";
131 entry-latency-us = <5000>;
132 exit-latency-us = <8000>;
133 min-residency-us = <7000>;
134 };
135 };
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