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1 | Linear Technology LTC3589, LTC3589-1, and LTC3589-2 8-output regulators | ||
2 | |||
3 | Required properties: | ||
4 | - compatible: "lltc,ltc3589", "lltc,ltc3589-1" or "lltc,ltc3589-2" | ||
5 | - reg: I2C slave address | ||
6 | |||
7 | Required child node: | ||
8 | - regulators: Contains eight regulator child nodes sw1, sw2, sw3, bb-out, | ||
9 | ldo1, ldo2, ldo3, and ldo4, specifying the initialization data as | ||
10 | documented in Documentation/devicetree/bindings/regulator/regulator.txt. | ||
11 | |||
12 | Each regulator is defined using the standard binding for regulators. The | ||
13 | nodes for sw1, sw2, sw3, bb-out, ldo1, and ldo2 additionally need to specify | ||
14 | the resistor values of their external feedback voltage dividers: | ||
15 | |||
16 | Required properties (not on ldo3, ldo4): | ||
17 | - lltc,fb-voltage-divider: An array of two integers containing the resistor | ||
18 | values R1 and R2 of the feedback voltage divider in ohms. | ||
19 | |||
20 | Regulators sw1, sw2, sw3, and ldo2 can regulate the feedback reference from | ||
21 | 0.3625 V to 0.75 V in 12.5 mV steps. The output voltage thus ranges between | ||
22 | 0.3625 * (1 + R1/R2) V and 0.75 * (1 + R1/R2) V. Regulators bb-out and ldo1 | ||
23 | have a fixed 0.8 V reference and thus output 0.8 * (1 + R1/R2) V. The ldo3 | ||
24 | regulator is fixed to 1.8 V on LTC3589 and to 2.8 V on LTC3589-1,2. The ldo4 | ||
25 | regulator can output between 1.8 V and 3.3 V on LTC3589 and between 1.2 V | ||
26 | and 3.2 V on LTC3589-1,2 in four steps. The ldo1 standby regulator can not | ||
27 | be disabled and thus should have the regulator-always-on property set. | ||
28 | |||
29 | Example: | ||
30 | |||
31 | ltc3589: pmic@34 { | ||
32 | compatible = "lltc,ltc3589-1"; | ||
33 | reg = <0x34>; | ||
34 | |||
35 | regulators { | ||
36 | sw1_reg: sw1 { | ||
37 | regulator-min-microvolt = <591930>; | ||
38 | regulator-max-microvolt = <1224671>; | ||
39 | lltc,fb-voltage-divider = <100000 158000>; | ||
40 | regulator-ramp-delay = <7000>; | ||
41 | regulator-boot-on; | ||
42 | regulator-always-on; | ||
43 | }; | ||
44 | |||
45 | sw2_reg: sw2 { | ||
46 | regulator-min-microvolt = <704123>; | ||
47 | regulator-max-microvolt = <1456803>; | ||
48 | lltc,fb-voltage-divider = <180000 191000>; | ||
49 | regulator-ramp-delay = <7000>; | ||
50 | regulator-boot-on; | ||
51 | regulator-always-on; | ||
52 | }; | ||
53 | |||
54 | sw3_reg: sw3 { | ||
55 | regulator-min-microvolt = <1341250>; | ||
56 | regulator-max-microvolt = <2775000>; | ||
57 | lltc,fb-voltage-divider = <270000 100000>; | ||
58 | regulator-ramp-delay = <7000>; | ||
59 | regulator-boot-on; | ||
60 | regulator-always-on; | ||
61 | }; | ||
62 | |||
63 | bb_out_reg: bb-out { | ||
64 | regulator-min-microvolt = <3387341>; | ||
65 | regulator-max-microvolt = <3387341>; | ||
66 | lltc,fb-voltage-divider = <511000 158000>; | ||
67 | regulator-boot-on; | ||
68 | regulator-always-on; | ||
69 | }; | ||
70 | |||
71 | ldo1_reg: ldo1 { | ||
72 | regulator-min-microvolt = <1306329>; | ||
73 | regulator-max-microvolt = <1306329>; | ||
74 | lltc,fb-voltage-divider = <100000 158000>; | ||
75 | regulator-boot-on; | ||
76 | regulator-always-on; | ||
77 | }; | ||
78 | |||
79 | ldo2_reg: ldo2 { | ||
80 | regulator-min-microvolt = <704123>; | ||
81 | regulator-max-microvolt = <1456806>; | ||
82 | lltc,fb-voltage-divider = <180000 191000>; | ||
83 | regulator-ramp-delay = <7000>; | ||
84 | regulator-boot-on; | ||
85 | regulator-always-on; | ||
86 | }; | ||
87 | |||
88 | ldo3_reg: ldo3 { | ||
89 | regulator-min-microvolt = <2800000>; | ||
90 | regulator-max-microvolt = <2800000>; | ||
91 | regulator-boot-on; | ||
92 | }; | ||
93 | |||
94 | ldo4_reg: ldo4 { | ||
95 | regulator-min-microvolt = <1200000>; | ||
96 | regulator-max-microvolt = <3200000>; | ||
97 | }; | ||
98 | }; | ||
99 | }; | ||