mirror of https://gitee.com/openkylin/linux.git
95 lines
2.7 KiB
Plaintext
95 lines
2.7 KiB
Plaintext
Linear Technology LTC3676 8-output regulators
|
|
|
|
Required properties:
|
|
- compatible: "lltc,ltc3676"
|
|
- reg: I2C slave address
|
|
|
|
Required child node:
|
|
- regulators: Contains eight regulator child nodes sw1, sw2, sw3, sw4,
|
|
ldo1, ldo2, ldo3, and ldo4, specifying the initialization data as
|
|
documented in Documentation/devicetree/bindings/regulator/regulator.txt.
|
|
|
|
Each regulator is defined using the standard binding for regulators. The
|
|
nodes for sw1, sw2, sw3, sw4, ldo1, ldo2 and ldo4 additionally need to specify
|
|
the resistor values of their external feedback voltage dividers:
|
|
|
|
Required properties (not on ldo3):
|
|
- lltc,fb-voltage-divider: An array of two integers containing the resistor
|
|
values R1 and R2 of the feedback voltage divider in ohms.
|
|
|
|
Regulators sw1, sw2, sw3, sw4 can regulate the feedback reference from:
|
|
412.5mV to 800mV in 12.5 mV steps. The output voltage thus ranges between
|
|
0.4125 * (1 + R1/R2) V and 0.8 * (1 + R1/R2) V.
|
|
|
|
Regulators ldo1, ldo2, and ldo4 have a fixed 0.725 V reference and thus output
|
|
0.725 * (1 + R1/R2) V. The ldo3 regulator is fixed to 1.8 V. The ldo1 standby
|
|
regulator can not be disabled and thus should have the regulator-always-on
|
|
property set.
|
|
|
|
Example:
|
|
|
|
ltc3676: pmic@3c {
|
|
compatible = "lltc,ltc3676";
|
|
reg = <0x3c>;
|
|
|
|
regulators {
|
|
sw1_reg: sw1 {
|
|
regulator-min-microvolt = <674400>;
|
|
regulator-max-microvolt = <1308000>;
|
|
lltc,fb-voltage-divider = <127000 200000>;
|
|
regulator-ramp-delay = <7000>;
|
|
regulator-boot-on;
|
|
regulator-always-on;
|
|
};
|
|
|
|
sw2_reg: sw2 {
|
|
regulator-min-microvolt = <1033310>;
|
|
regulator-max-microvolt = <200400>;
|
|
lltc,fb-voltage-divider = <301000 200000>;
|
|
regulator-ramp-delay = <7000>;
|
|
regulator-boot-on;
|
|
regulator-always-on;
|
|
};
|
|
|
|
sw3_reg: sw3 {
|
|
regulator-min-microvolt = <674400>;
|
|
regulator-max-microvolt = <130800>;
|
|
lltc,fb-voltage-divider = <127000 200000>;
|
|
regulator-ramp-delay = <7000>;
|
|
regulator-boot-on;
|
|
regulator-always-on;
|
|
};
|
|
|
|
sw4_reg: sw4 {
|
|
regulator-min-microvolt = <868310>;
|
|
regulator-max-microvolt = <168400>;
|
|
lltc,fb-voltage-divider = <221000 200000>;
|
|
regulator-ramp-delay = <7000>;
|
|
regulator-boot-on;
|
|
regulator-always-on;
|
|
};
|
|
|
|
ldo2_reg: ldo2 {
|
|
regulator-min-microvolt = <2490375>;
|
|
regulator-max-microvolt = <2490375>;
|
|
lltc,fb-voltage-divider = <487000 200000>;
|
|
regulator-boot-on;
|
|
regulator-always-on;
|
|
};
|
|
|
|
ldo3_reg: ldo3 {
|
|
regulator-min-microvolt = <1800000>;
|
|
regulator-max-microvolt = <1800000>;
|
|
regulator-boot-on;
|
|
};
|
|
|
|
ldo4_reg: ldo4 {
|
|
regulator-min-microvolt = <3023250>;
|
|
regulator-max-microvolt = <3023250>;
|
|
lltc,fb-voltage-divider = <634000 200000>;
|
|
regulator-boot-on;
|
|
regulator-always-on;
|
|
};
|
|
};
|
|
};
|