* Maxim MAX8998, National/TI LP3974 multi-function device The Maxim MAX8998 is a multi-function device which includes voltage/current regulators, real time clock, battery charging controller and several other sub-blocks. It is interfaced using an I2C interface. Each sub-block is addressed by the host system using different i2c slave address. PMIC sub-block -------------- The PMIC sub-block contains a number of voltage and current regulators, with controllable parameters and dynamic voltage scaling capability. In addition, it includes a real time clock and battery charging controller as well. It is accessible at I2C address 0x66. Required properties: - compatible: Should be one of the following: - "maxim,max8998" for Maxim MAX8998 - "national,lp3974" or "ti,lp3974" for National/TI LP3974. - reg: Specifies the i2c slave address of the pmic block. It should be 0x66. Optional properties: - interrupts: Interrupt specifiers for two interrupt sources. - First interrupt specifier is for main interrupt. - Second interrupt specifier is for power-on/-off interrupt. - max8998,pmic-buck1-dvs-gpios: GPIO specifiers for two host gpios used for buck 1 dvs. The format of the gpio specifier depends on the gpio controller. - max8998,pmic-buck2-dvs-gpio: GPIO specifier for host gpio used for buck 2 dvs. The format of the gpio specifier depends on the gpio controller. - max8998,pmic-buck1-default-dvs-idx: Default voltage setting selected from the possible 4 options selectable by the dvs gpios. The value of this property should be 0, 1, 2 or 3. If not specified or out of range, a default value of 0 is taken. - max8998,pmic-buck2-default-dvs-idx: Default voltage setting selected from the possible 2 options selectable by the dvs gpios. The value of this property should be 0 or 1. If not specified or out of range, a default value of 0 is taken. - max8998,pmic-buck-voltage-lock: If present, disallows changing of preprogrammed buck dvfs voltages. Additional properties required if max8998,pmic-buck1-dvs-gpios is defined: - max8998,pmic-buck1-dvs-voltage: An array of 4 voltage values in microvolts for buck1 regulator that can be selected using dvs gpio. Additional properties required if max8998,pmic-buck2-dvs-gpio is defined: - max8998,pmic-buck2-dvs-voltage: An array of 2 voltage values in microvolts for buck2 regulator that can be selected using dvs gpio. Regulators: All the regulators of MAX8998 to be instantiated shall be listed in a child node named 'regulators'. Each regulator is represented by a child node of the 'regulators' node. regulator-name { /* standard regulator bindings here */ }; Following regulators of the MAX8998 PMIC block are supported. Note that the 'n' in regulator name, as in LDOn or BUCKn, represents the LDO or BUCK number as described in MAX8998 datasheet. - LDOn - valid values for n are 2 to 17 - Example: LDO2, LDO10, LDO17 - BUCKn - valid values for n are 1 to 4. - Example: BUCK1, BUCK2, BUCK3, BUCK4 - ENVICHG: Battery Charging Current Monitor Output. This is a fixed voltage type regulator - ESAFEOUT1: (ldo19) - ESAFEOUT2: (ld020) Standard regulator bindings are used inside regulator subnodes. Check Documentation/devicetree/bindings/regulator/regulator.txt for more details. Example: pmic@66 { compatible = "maxim,max8998-pmic"; reg = <0x66>; interrupt-parent = <&wakeup_eint>; interrupts = <4 0>, <3 0>; /* Buck 1 DVS settings */ max8998,pmic-buck1-default-dvs-idx = <0>; max8998,pmic-buck1-dvs-gpios = <&gpx0 0 1 0 0>, /* SET1 */ <&gpx0 1 1 0 0>; /* SET2 */ max8998,pmic-buck1-dvs-voltage = <1350000>, <1300000>, <1000000>, <950000>; /* Buck 2 DVS settings */ max8998,pmic-buck2-default-dvs-idx = <0>; max8998,pmic-buck2-dvs-gpio = <&gpx0 0 3 0 0>; /* SET3 */ max8998,pmic-buck2-dvs-voltage = <1350000>, <1300000>; /* Regulators to instantiate */ regulators { ldo2_reg: LDO2 { regulator-name = "VDD_ALIVE_1.1V"; regulator-min-microvolt = <1100000>; regulator-max-microvolt = <1100000>; regulator-always-on; }; buck1_reg: BUCK1 { regulator-name = "VDD_ARM_1.2V"; regulator-min-microvolt = <950000>; regulator-max-microvolt = <1350000>; regulator-always-on; regulator-boot-on; }; }; };