| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 1 | Linear Technology LTC3676 8-output regulators |
| 2 | |
| 3 | Required properties: |
| 4 | - compatible: "lltc,ltc3676" |
| 5 | - reg: I2C slave address |
| 6 | |
| 7 | Required child node: |
| 8 | - regulators: Contains eight regulator child nodes sw1, sw2, sw3, sw4, |
| 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, sw4, ldo1, ldo2 and ldo4 additionally need to specify |
| 14 | the resistor values of their external feedback voltage dividers: |
| 15 | |
| 16 | Required properties (not on ldo3): |
| 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, sw4 can regulate the feedback reference from: |
| 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. |
| 23 | |
| 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 fixed to 1.8 V. The ldo1 standby |
| 26 | regulator can not be disabled and thus should have the regulator-always-on |
| 27 | property set. |
| 28 | |
| 29 | Example: |
| 30 | |
| 31 | ltc3676: pmic@3c { |
| 32 | compatible = "lltc,ltc3676"; |
| 33 | reg = <0x3c>; |
| 34 | |
| 35 | regulators { |
| 36 | sw1_reg: sw1 { |
| 37 | regulator-min-microvolt = <674400>; |
| 38 | regulator-max-microvolt = <1308000>; |
| 39 | lltc,fb-voltage-divider = <127000 200000>; |
| 40 | regulator-ramp-delay = <7000>; |
| 41 | regulator-boot-on; |
| 42 | regulator-always-on; |
| 43 | }; |
| 44 | |
| 45 | sw2_reg: sw2 { |
| 46 | regulator-min-microvolt = <1033310>; |
| 47 | regulator-max-microvolt = <200400>; |
| 48 | lltc,fb-voltage-divider = <301000 200000>; |
| 49 | regulator-ramp-delay = <7000>; |
| 50 | regulator-boot-on; |
| 51 | regulator-always-on; |
| 52 | }; |
| 53 | |
| 54 | sw3_reg: sw3 { |
| 55 | regulator-min-microvolt = <674400>; |
| 56 | regulator-max-microvolt = <130800>; |
| 57 | lltc,fb-voltage-divider = <127000 200000>; |
| 58 | regulator-ramp-delay = <7000>; |
| 59 | regulator-boot-on; |
| 60 | regulator-always-on; |
| 61 | }; |
| 62 | |
| 63 | sw4_reg: sw4 { |
| 64 | regulator-min-microvolt = <868310>; |
| 65 | regulator-max-microvolt = <168400>; |
| 66 | lltc,fb-voltage-divider = <221000 200000>; |
| 67 | regulator-ramp-delay = <7000>; |
| 68 | regulator-boot-on; |
| 69 | regulator-always-on; |
| 70 | }; |
| 71 | |
| 72 | ldo2_reg: ldo2 { |
| 73 | regulator-min-microvolt = <2490375>; |
| 74 | regulator-max-microvolt = <2490375>; |
| 75 | lltc,fb-voltage-divider = <487000 200000>; |
| 76 | regulator-boot-on; |
| 77 | regulator-always-on; |
| 78 | }; |
| 79 | |
| 80 | ldo3_reg: ldo3 { |
| 81 | regulator-min-microvolt = <1800000>; |
| 82 | regulator-max-microvolt = <1800000>; |
| 83 | regulator-boot-on; |
| 84 | }; |
| 85 | |
| 86 | ldo4_reg: ldo4 { |
| 87 | regulator-min-microvolt = <3023250>; |
| 88 | regulator-max-microvolt = <3023250>; |
| 89 | lltc,fb-voltage-divider = <634000 200000>; |
| 90 | regulator-boot-on; |
| 91 | regulator-always-on; |
| 92 | }; |
| 93 | }; |
| 94 | }; |