xref: /linux/Documentation/devicetree/bindings/opp/allwinner,sun50i-h6-operating-points.yaml (revision a460513ed4b6994bfeb7bd86f72853140bc1ac12) 
1# SPDX-License-Identifier: GPL-2.0
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/opp/allwinner,sun50i-h6-operating-points.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Allwinner H6 CPU OPP Device Tree Bindings
8
9maintainers:
10  - Chen-Yu Tsai <wens@csie.org>
11  - Maxime Ripard <mripard@kernel.org>
12
13description: |
14  For some SoCs, the CPU frequency subset and voltage value of each
15  OPP varies based on the silicon variant in use. Allwinner Process
16  Voltage Scaling Tables defines the voltage and frequency value based
17  on the speedbin blown in the efuse combination. The
18  sun50i-cpufreq-nvmem driver reads the efuse value from the SoC to
19  provide the OPP framework with required information.
20
21properties:
22  compatible:
23    const: allwinner,sun50i-h6-operating-points
24
25  nvmem-cells:
26    description: |
27      A phandle pointing to a nvmem-cells node representing the efuse
28      registers that has information about the speedbin that is used
29      to select the right frequency/voltage value pair. Please refer
30      the for nvmem-cells bindings
31      Documentation/devicetree/bindings/nvmem/nvmem.txt and also
32      examples below.
33
34  opp-shared: true
35
36required:
37  - compatible
38  - nvmem-cells
39
40patternProperties:
41  "opp-[0-9]+":
42    type: object
43
44    properties:
45      opp-hz: true
46
47    patternProperties:
48      "opp-microvolt-.*": true
49
50    required:
51      - opp-hz
52      - opp-microvolt-speed0
53      - opp-microvolt-speed1
54      - opp-microvolt-speed2
55
56    unevaluatedProperties: false
57
58additionalProperties: false
59
60examples:
61  - |
62    cpu_opp_table: opp-table {
63        compatible = "allwinner,sun50i-h6-operating-points";
64        nvmem-cells = <&speedbin_efuse>;
65        opp-shared;
66
67        opp-480000000 {
68            clock-latency-ns = <244144>; /* 8 32k periods */
69            opp-hz = /bits/ 64 <480000000>;
70
71            opp-microvolt-speed0 = <880000>;
72            opp-microvolt-speed1 = <820000>;
73            opp-microvolt-speed2 = <800000>;
74        };
75
76        opp-720000000 {
77            clock-latency-ns = <244144>; /* 8 32k periods */
78            opp-hz = /bits/ 64 <720000000>;
79
80            opp-microvolt-speed0 = <880000>;
81            opp-microvolt-speed1 = <820000>;
82            opp-microvolt-speed2 = <800000>;
83        };
84
85        opp-816000000 {
86            clock-latency-ns = <244144>; /* 8 32k periods */
87            opp-hz = /bits/ 64 <816000000>;
88
89            opp-microvolt-speed0 = <880000>;
90            opp-microvolt-speed1 = <820000>;
91            opp-microvolt-speed2 = <800000>;
92        };
93
94        opp-888000000 {
95            clock-latency-ns = <244144>; /* 8 32k periods */
96            opp-hz = /bits/ 64 <888000000>;
97
98            opp-microvolt-speed0 = <940000>;
99            opp-microvolt-speed1 = <820000>;
100            opp-microvolt-speed2 = <800000>;
101        };
102
103        opp-1080000000 {
104            clock-latency-ns = <244144>; /* 8 32k periods */
105            opp-hz = /bits/ 64 <1080000000>;
106
107            opp-microvolt-speed0 = <1060000>;
108            opp-microvolt-speed1 = <880000>;
109            opp-microvolt-speed2 = <840000>;
110        };
111
112        opp-1320000000 {
113            clock-latency-ns = <244144>; /* 8 32k periods */
114            opp-hz = /bits/ 64 <1320000000>;
115
116            opp-microvolt-speed0 = <1160000>;
117            opp-microvolt-speed1 = <940000>;
118            opp-microvolt-speed2 = <900000>;
119        };
120
121        opp-1488000000 {
122            clock-latency-ns = <244144>; /* 8 32k periods */
123            opp-hz = /bits/ 64 <1488000000>;
124
125            opp-microvolt-speed0 = <1160000>;
126            opp-microvolt-speed1 = <1000000>;
127            opp-microvolt-speed2 = <960000>;
128        };
129    };
130
131...
132