Commit | Line | Data |
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a3cd1de4 PZ |
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 | }; |