1 Linear Technology LTC3676 8-output regulators 1 Linear Technology LTC3676 8-output regulators
2 2
3 Required properties: 3 Required properties:
4 - compatible: "lltc,ltc3676" 4 - compatible: "lltc,ltc3676"
5 - reg: I2C slave address 5 - reg: I2C slave address
6 6
7 Required child node: 7 Required child node:
8 - regulators: Contains eight regulator child n 8 - regulators: Contains eight regulator child nodes sw1, sw2, sw3, sw4,
9 ldo1, ldo2, ldo3, and ldo4, specifying the i 9 ldo1, ldo2, ldo3, and ldo4, specifying the initialization data as
10 documented in Documentation/devicetree/bindi 10 documented in Documentation/devicetree/bindings/regulator/regulator.txt.
11 11
12 Each regulator is defined using the standard b 12 Each regulator is defined using the standard binding for regulators. The
13 nodes for sw1, sw2, sw3, sw4, ldo1, ldo2 and l 13 nodes for sw1, sw2, sw3, sw4, ldo1, ldo2 and ldo4 additionally need to specify
14 the resistor values of their external feedback 14 the resistor values of their external feedback voltage dividers:
15 15
16 Required properties (not on ldo3): 16 Required properties (not on ldo3):
17 - lltc,fb-voltage-divider: An array of two int 17 - lltc,fb-voltage-divider: An array of two integers containing the resistor
18 values R1 and R2 of the feedback voltage div 18 values R1 and R2 of the feedback voltage divider in ohms.
19 19
20 Regulators sw1, sw2, sw3, sw4 can regulate the 20 Regulators sw1, sw2, sw3, sw4 can regulate the feedback reference from:
21 412.5mV to 800mV in 12.5 mV steps. The output 21 412.5mV to 800mV in 12.5 mV steps. The output voltage thus ranges between
22 0.4125 * (1 + R1/R2) V and 0.8 * (1 + R1/R2) V 22 0.4125 * (1 + R1/R2) V and 0.8 * (1 + R1/R2) V.
23 23
24 Regulators ldo1, ldo2, and ldo4 have a fixed 0 24 Regulators ldo1, ldo2, and ldo4 have a fixed 0.725 V reference and thus output
25 0.725 * (1 + R1/R2) V. The ldo3 regulator is f 25 0.725 * (1 + R1/R2) V. The ldo3 regulator is fixed to 1.8 V. The ldo1 standby
26 regulator can not be disabled and thus should 26 regulator can not be disabled and thus should have the regulator-always-on
27 property set. 27 property set.
28 28
29 Example: 29 Example:
30 30
31 ltc3676: pmic@3c { 31 ltc3676: pmic@3c {
32 compatible = "lltc,ltc3676"; 32 compatible = "lltc,ltc3676";
33 reg = <0x3c>; 33 reg = <0x3c>;
34 34
35 regulators { 35 regulators {
36 sw1_reg: sw1 { 36 sw1_reg: sw1 {
37 regulator-min- 37 regulator-min-microvolt = <674400>;
38 regulator-max- 38 regulator-max-microvolt = <1308000>;
39 lltc,fb-voltag 39 lltc,fb-voltage-divider = <127000 200000>;
40 regulator-ramp 40 regulator-ramp-delay = <7000>;
41 regulator-boot 41 regulator-boot-on;
42 regulator-alwa 42 regulator-always-on;
43 }; 43 };
44 44
45 sw2_reg: sw2 { 45 sw2_reg: sw2 {
46 regulator-min- 46 regulator-min-microvolt = <1033310>;
47 regulator-max- 47 regulator-max-microvolt = <200400>;
48 lltc,fb-voltag 48 lltc,fb-voltage-divider = <301000 200000>;
49 regulator-ramp 49 regulator-ramp-delay = <7000>;
50 regulator-boot 50 regulator-boot-on;
51 regulator-alwa 51 regulator-always-on;
52 }; 52 };
53 53
54 sw3_reg: sw3 { 54 sw3_reg: sw3 {
55 regulator-min- 55 regulator-min-microvolt = <674400>;
56 regulator-max- 56 regulator-max-microvolt = <130800>;
57 lltc,fb-voltag 57 lltc,fb-voltage-divider = <127000 200000>;
58 regulator-ramp 58 regulator-ramp-delay = <7000>;
59 regulator-boot 59 regulator-boot-on;
60 regulator-alwa 60 regulator-always-on;
61 }; 61 };
62 62
63 sw4_reg: sw4 { 63 sw4_reg: sw4 {
64 regulator-min- 64 regulator-min-microvolt = <868310>;
65 regulator-max- 65 regulator-max-microvolt = <168400>;
66 lltc,fb-voltag 66 lltc,fb-voltage-divider = <221000 200000>;
67 regulator-ramp 67 regulator-ramp-delay = <7000>;
68 regulator-boot 68 regulator-boot-on;
69 regulator-alwa 69 regulator-always-on;
70 }; 70 };
71 71
72 ldo2_reg: ldo2 { 72 ldo2_reg: ldo2 {
73 regulator-min- 73 regulator-min-microvolt = <2490375>;
74 regulator-max- 74 regulator-max-microvolt = <2490375>;
75 lltc,fb-voltag 75 lltc,fb-voltage-divider = <487000 200000>;
76 regulator-boot 76 regulator-boot-on;
77 regulator-alwa 77 regulator-always-on;
78 }; 78 };
79 79
80 ldo3_reg: ldo3 { 80 ldo3_reg: ldo3 {
81 regulator-min- 81 regulator-min-microvolt = <1800000>;
82 regulator-max- 82 regulator-max-microvolt = <1800000>;
83 regulator-boot 83 regulator-boot-on;
84 }; 84 };
85 85
86 ldo4_reg: ldo4 { 86 ldo4_reg: ldo4 {
87 regulator-min- 87 regulator-min-microvolt = <3023250>;
88 regulator-max- 88 regulator-max-microvolt = <3023250>;
89 lltc,fb-voltag 89 lltc,fb-voltage-divider = <634000 200000>;
90 regulator-boot 90 regulator-boot-on;
91 regulator-alwa 91 regulator-always-on;
92 }; 92 };
93 }; 93 };
94 }; 94 };
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