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99 lines
3.1 KiB
Text
99 lines
3.1 KiB
Text
Linear Technology LTC3589, LTC3589-1, and LTC3589-2 8-output regulators
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Required properties:
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- compatible: "lltc,ltc3589", "lltc,ltc3589-1" or "lltc,ltc3589-2"
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- reg: I2C slave address
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Required child node:
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- regulators: Contains eight regulator child nodes sw1, sw2, sw3, bb-out,
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ldo1, ldo2, ldo3, and ldo4, specifying the initialization data as
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documented in Documentation/devicetree/bindings/regulator/regulator.txt.
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Each regulator is defined using the standard binding for regulators. The
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nodes for sw1, sw2, sw3, bb-out, ldo1, and ldo2 additionally need to specify
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the resistor values of their external feedback voltage dividers:
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Required properties (not on ldo3, ldo4):
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- lltc,fb-voltage-divider: An array of two integers containing the resistor
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values R1 and R2 of the feedback voltage divider in ohms.
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Regulators sw1, sw2, sw3, and ldo2 can regulate the feedback reference from
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0.3625 V to 0.75 V in 12.5 mV steps. The output voltage thus ranges between
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0.3625 * (1 + R1/R2) V and 0.75 * (1 + R1/R2) V. Regulators bb-out and ldo1
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have a fixed 0.8 V reference and thus output 0.8 * (1 + R1/R2) V. The ldo3
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regulator is fixed to 1.8 V on LTC3589 and to 2.8 V on LTC3589-1,2. The ldo4
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regulator can output between 1.8 V and 3.3 V on LTC3589 and between 1.2 V
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and 3.2 V on LTC3589-1,2 in four steps. The ldo1 standby regulator can not
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be disabled and thus should have the regulator-always-on property set.
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Example:
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ltc3589: pmic@34 {
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compatible = "lltc,ltc3589-1";
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reg = <0x34>;
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regulators {
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sw1_reg: sw1 {
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regulator-min-microvolt = <591930>;
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regulator-max-microvolt = <1224671>;
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lltc,fb-voltage-divider = <100000 158000>;
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regulator-ramp-delay = <7000>;
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regulator-boot-on;
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regulator-always-on;
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};
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sw2_reg: sw2 {
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regulator-min-microvolt = <704123>;
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regulator-max-microvolt = <1456803>;
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lltc,fb-voltage-divider = <180000 191000>;
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regulator-ramp-delay = <7000>;
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regulator-boot-on;
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regulator-always-on;
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};
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sw3_reg: sw3 {
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regulator-min-microvolt = <1341250>;
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regulator-max-microvolt = <2775000>;
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lltc,fb-voltage-divider = <270000 100000>;
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regulator-ramp-delay = <7000>;
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regulator-boot-on;
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regulator-always-on;
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};
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bb_out_reg: bb-out {
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regulator-min-microvolt = <3387341>;
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regulator-max-microvolt = <3387341>;
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lltc,fb-voltage-divider = <511000 158000>;
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regulator-boot-on;
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regulator-always-on;
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};
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ldo1_reg: ldo1 {
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regulator-min-microvolt = <1306329>;
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regulator-max-microvolt = <1306329>;
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lltc,fb-voltage-divider = <100000 158000>;
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regulator-boot-on;
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regulator-always-on;
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};
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ldo2_reg: ldo2 {
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regulator-min-microvolt = <704123>;
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regulator-max-microvolt = <1456806>;
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lltc,fb-voltage-divider = <180000 191000>;
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regulator-ramp-delay = <7000>;
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regulator-boot-on;
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regulator-always-on;
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};
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ldo3_reg: ldo3 {
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regulator-min-microvolt = <2800000>;
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regulator-max-microvolt = <2800000>;
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regulator-boot-on;
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};
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ldo4_reg: ldo4 {
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regulator-min-microvolt = <1200000>;
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regulator-max-microvolt = <3200000>;
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};
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};
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};
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