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1 | Binding for Maxim MAX77802 regulators | ||
2 | |||
3 | This is a part of device tree bindings of MAX77802 multi-function device. | ||
4 | More information can be found in bindings/mfd/max77802.txt file. | ||
5 | |||
6 | The MAX77802 PMIC has 10 high-efficiency Buck and 32 Low-dropout (LDO) | ||
7 | regulators that can be controlled over I2C. | ||
8 | |||
9 | Following properties should be present in main device node of the MFD chip. | ||
10 | |||
11 | Optional node: | ||
12 | - regulators : The regulators of max77802 have to be instantiated | ||
13 | under subnode named "regulators" using the following format. | ||
14 | |||
15 | regulator-name { | ||
16 | standard regulator constraints.... | ||
17 | }; | ||
18 | refer Documentation/devicetree/bindings/regulator/regulator.txt | ||
19 | |||
20 | The regulator node name should be initialized with a string to get matched | ||
21 | with their hardware counterparts as follow. The valid names are: | ||
22 | |||
23 | -LDOn : for LDOs, where n can lie in ranges 1-15, 17-21, 23-30 | ||
24 | and 32-35. | ||
25 | example: LDO1, LDO2, LDO35. | ||
26 | -BUCKn : for BUCKs, where n can lie in range 1 to 10. | ||
27 | example: BUCK1, BUCK5, BUCK10. | ||
28 | |||
29 | The max77802 regulator supports two different operating modes: Normal and Low | ||
30 | Power Mode. Some regulators support the modes to be changed at startup or by | ||
31 | the consumers during normal operation while others only support to change the | ||
32 | mode during system suspend. The standard regulator suspend states binding can | ||
33 | be used to configure the regulator operating mode. | ||
34 | |||
35 | The regulators that support the standard "regulator-initial-mode" property, | ||
36 | changing their mode during normal operation are: LDOs 1, 3, 20 and 21. | ||
37 | |||
38 | The possible values for "regulator-initial-mode" and "regulator-mode" are: | ||
39 | 1: Normal regulator voltage output mode. | ||
40 | 3: Low Power which reduces the quiescent current down to only 1uA | ||
41 | |||
42 | The list of valid modes are defined in the dt-bindings/clock/maxim,max77802.h | ||
43 | header and can be included by device tree source files. | ||
44 | |||
45 | The standard "regulator-mode" property can only be used for regulators that | ||
46 | support changing their mode to Low Power Mode during suspend. These regulators | ||
47 | are: BUCKs 2-4 and LDOs 1-35. Also, it only takes effect if the regulator has | ||
48 | been enabled for the given suspend state using "regulator-on-in-suspend" and | ||
49 | has not been disabled for that state using "regulator-off-in-suspend". | ||
50 | |||
51 | Example: | ||
52 | |||
53 | max77802@09 { | ||
54 | compatible = "maxim,max77802"; | ||
55 | interrupt-parent = <&wakeup_eint>; | ||
56 | interrupts = <26 0>; | ||
57 | reg = <0x09>; | ||
58 | #address-cells = <1>; | ||
59 | #size-cells = <0>; | ||
60 | |||
61 | regulators { | ||
62 | ldo1_reg: LDO1 { | ||
63 | regulator-name = "vdd_1v0"; | ||
64 | regulator-min-microvolt = <1000000>; | ||
65 | regulator-max-microvolt = <1000000>; | ||
66 | regulator-always-on; | ||
67 | regulator-initial-mode = <MAX77802_OPMODE_LP>; | ||
68 | }; | ||
69 | |||
70 | ldo11_reg: LDO11 { | ||
71 | regulator-name = "vdd_ldo11"; | ||
72 | regulator-min-microvolt = <1900000>; | ||
73 | regulator-max-microvolt = <1900000>; | ||
74 | regulator-always-on; | ||
75 | regulator-state-mem { | ||
76 | regulator-on-in-suspend; | ||
77 | regulator-mode = <MAX77802_OPMODE_LP>; | ||
78 | }; | ||
79 | }; | ||
80 | |||
81 | buck1_reg: BUCK1 { | ||
82 | regulator-name = "vdd_mif"; | ||
83 | regulator-min-microvolt = <950000>; | ||
84 | regulator-max-microvolt = <1300000>; | ||
85 | regulator-always-on; | ||
86 | regulator-boot-on; | ||
87 | }; | ||
88 | }; | ||