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