1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/opp/ti,omap-opp-supply.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: Texas Instruments OMAP compatible OPP supply
8
9 description:
10 OMAP5, DRA7, and AM57 families of SoCs have Class 0 AVS eFuse
11 registers, which contain OPP-specific voltage information tailored
12 for the specific device. This binding provides the information
13 needed to describe such a hardware values and relate them to program
14 the primary regulator during an OPP transition.
15
16 Also, some supplies may have an associated vbb-supply, an Adaptive
17 Body Bias regulator, which must transition in a specific sequence
18 w.r.t the vdd-supply and clk when making an OPP transition. By
19 supplying two regulators to the device that will undergo OPP
20 transitions, we can use the multi-regulator support implemented by
21 the OPP core to describe both regulators the platform needs. The
22 OPP core binding Documentation/devicetree/bindings/opp/opp-v2.yaml
23 provides further information (refer to Example 4 Handling multiple
24 regulators).
25
26 maintainers:
27 - Nishanth Menon <nm@ti.com>
28
29 properties:
30 $nodename:
31 pattern: '^opp-supply(@[0-9a-f]+)?$'
32
33 compatible:
34 oneOf:
35 - description: Basic OPP supply controlling VDD and VBB
36 const: ti,omap-opp-supply
37 - description: OMAP5+ optimized voltages in efuse(Class 0) VDD along with
38 VBB.
39 const: ti,omap5-opp-supply
40 - description: OMAP5+ optimized voltages in efuse(class0) VDD but no VBB
41 const: ti,omap5-core-opp-supply
42
43 reg:
44 maxItems: 1
45
46 ti,absolute-max-voltage-uv:
47 $ref: /schemas/types.yaml#/definitions/uint32
48 description: Absolute maximum voltage for the OPP supply in micro-volts.
49 minimum: 750000
50 maximum: 1500000
51
52 ti,efuse-settings:
53 description: An array of u32 tuple items providing information about
54 optimized efuse configuration.
55 minItems: 1
56 $ref: /schemas/types.yaml#/definitions/uint32-matrix
57 items:
58 items:
59 - description: Reference voltage in micro-volts (OPP Voltage)
60 minimum: 750000
61 maximum: 1500000
62 multipleOf: 10000
63 - description: efuse offset where the optimized voltage is located
64 multipleOf: 4
65 maximum: 256
66
67 required:
68 - compatible
69 - ti,absolute-max-voltage-uv
70
71 allOf:
72 - if:
73 not:
74 properties:
75 compatible:
76 contains:
77 const: ti,omap-opp-supply
78 then:
79 required:
80 - reg
81 - ti,efuse-settings
82
83 additionalProperties: false
84
85 examples:
86 - |
87 opp-supply {
88 compatible = "ti,omap-opp-supply";
89 ti,absolute-max-voltage-uv = <1375000>;
90 };
91 - |
92 opp-supply@4a003b20 {
93 compatible = "ti,omap5-opp-supply";
94 reg = <0x4a003b20 0x8>;
95 ti,efuse-settings =
96 /* uV offset */
97 <1060000 0x0>,
98 <1160000 0x4>,
99 <1210000 0x8>;
100 ti,absolute-max-voltage-uv = <1500000>;
101 };
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