189 lines
6.6 KiB
Plaintext
189 lines
6.6 KiB
Plaintext
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Maxim MAX77693 multi-function device
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MAX77693 is a Multifunction device with the following submodules:
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- PMIC,
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- CHARGER,
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- LED,
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- MUIC,
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- HAPTIC
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It is interfaced to host controller using i2c.
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This document describes the bindings for the mfd device.
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Required properties:
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- compatible : Must be "maxim,max77693".
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- reg : Specifies the i2c slave address of PMIC block.
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- interrupts : This i2c device has an IRQ line connected to the main SoC.
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- interrupt-parent : The parent interrupt controller.
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Optional properties:
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- regulators : The regulators of max77693 have to be instantiated under subnode
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named "regulators" using the following format.
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regulators {
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regulator-compatible = ESAFEOUT1/ESAFEOUT2/CHARGER
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standard regulator constraints[*].
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};
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[*] refer Documentation/devicetree/bindings/regulator/regulator.txt
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- haptic : The MAX77693 haptic device utilises a PWM controlled motor to provide
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users with tactile feedback. PWM period and duty-cycle are varied in
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order to provide the appropriate level of feedback.
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Required properties:
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- compatible : Must be "maxim,max77693-haptic"
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- haptic-supply : power supply for the haptic motor
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[*] refer Documentation/devicetree/bindings/regulator/regulator.txt
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- pwms : phandle to the physical PWM(Pulse Width Modulation) device.
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PWM properties should be named "pwms". And number of cell is different
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for each pwm device.
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To get more information, please refer to documentation.
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[*] refer Documentation/devicetree/bindings/pwm/pwm.txt
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- charger : Node configuring the charger driver.
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If present, required properties:
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- compatible : Must be "maxim,max77693-charger".
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Optional properties (if not set, defaults will be used):
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- maxim,constant-microvolt : Battery constant voltage in uV. The charger
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will operate in fast charge constant current mode till battery voltage
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reaches this level. Then the charger will switch to fast charge constant
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voltage mode. Also vsys (system voltage) will be set to this value when
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DC power is supplied but charger is not enabled.
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Valid values: 3650000 - 4400000, step by 25000 (rounded down)
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Default: 4200000
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- maxim,min-system-microvolt : Minimal system voltage in uV.
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Valid values: 3000000 - 3700000, step by 100000 (rounded down)
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Default: 3600000
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- maxim,thermal-regulation-celsius : Temperature in Celsius for entering
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high temperature charging mode. If die temperature exceeds this value
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the charging current will be reduced by 105 mA/Celsius.
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Valid values: 70, 85, 100, 115
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Default: 100
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- maxim,battery-overcurrent-microamp : Overcurrent protection threshold
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in uA (current from battery to system).
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Valid values: 2000000 - 3500000, step by 250000 (rounded down)
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Default: 3500000
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- maxim,charge-input-threshold-microvolt : Threshold voltage in uV for
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triggering input voltage regulation loop. If input voltage decreases
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below this value, the input current will be reduced to reach the
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threshold voltage.
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Valid values: 4300000, 4700000, 4800000, 4900000
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Default: 4300000
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- led : the LED submodule device node
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There are two LED outputs available - FLED1 and FLED2. Each of them can
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control a separate LED or they can be connected together to double
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the maximum current for a single connected LED. One LED is represented
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by one child node.
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Required properties:
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- compatible : Must be "maxim,max77693-led".
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Optional properties:
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- maxim,boost-mode :
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In boost mode the device can produce up to 1.2A of total current
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on both outputs. The maximum current on each output is reduced
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to 625mA then. If not enabled explicitly, boost setting defaults to
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LEDS_BOOST_FIXED in case both current sources are used.
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Possible values:
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LEDS_BOOST_OFF (0) - no boost,
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LEDS_BOOST_ADAPTIVE (1) - adaptive mode,
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LEDS_BOOST_FIXED (2) - fixed mode.
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- maxim,boost-mvout : Output voltage of the boost module in millivolts.
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Valid values: 3300 - 5500, step by 25 (rounded down)
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Default: 3300
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- maxim,mvsys-min : Low input voltage level in millivolts. Flash is not fired
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if chip estimates that system voltage could drop below this level due
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to flash power consumption.
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Valid values: 2400 - 3400, step by 33 (rounded down)
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Default: 2400
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Required properties for the LED child node:
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- led-sources : see Documentation/devicetree/bindings/leds/common.txt;
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device current output identifiers: 0 - FLED1, 1 - FLED2
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- led-max-microamp : see Documentation/devicetree/bindings/leds/common.txt
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Valid values for a LED connected to one FLED output:
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15625 - 250000, step by 15625 (rounded down)
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Valid values for a LED connected to both FLED outputs:
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15625 - 500000, step by 15625 (rounded down)
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- flash-max-microamp : see Documentation/devicetree/bindings/leds/common.txt
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Valid values for a single LED connected to one FLED output
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(boost mode must be turned off):
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15625 - 1000000, step by 15625 (rounded down)
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Valid values for a single LED connected to both FLED outputs:
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15625 - 1250000, step by 15625 (rounded down)
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Valid values for two LEDs case:
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15625 - 625000, step by 15625 (rounded down)
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- flash-max-timeout-us : see Documentation/devicetree/bindings/leds/common.txt
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Valid values: 62500 - 1000000, step by 62500 (rounded down)
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Optional properties for the LED child node:
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- label : see Documentation/devicetree/bindings/leds/common.txt
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Example:
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#include <dt-bindings/leds/common.h>
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max77693@66 {
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compatible = "maxim,max77693";
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reg = <0x66>;
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interrupt-parent = <&gpx1>;
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interrupts = <5 2>;
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regulators {
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esafeout@1 {
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regulator-compatible = "ESAFEOUT1";
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regulator-name = "ESAFEOUT1";
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regulator-boot-on;
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};
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esafeout@2 {
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regulator-compatible = "ESAFEOUT2";
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regulator-name = "ESAFEOUT2";
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};
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charger@0 {
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regulator-compatible = "CHARGER";
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regulator-name = "CHARGER";
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regulator-min-microamp = <60000>;
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regulator-max-microamp = <2580000>;
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regulator-boot-on;
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};
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};
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haptic {
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compatible = "maxim,max77693-haptic";
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haptic-supply = <&haptic_supply>;
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pwms = <&pwm 0 40000 0>;
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pwm-names = "haptic";
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};
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charger {
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compatible = "maxim,max77693-charger";
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maxim,constant-microvolt = <4200000>;
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maxim,min-system-microvolt = <3600000>;
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maxim,thermal-regulation-celsius = <75>;
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maxim,battery-overcurrent-microamp = <3000000>;
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maxim,charge-input-threshold-microvolt = <4300000>;
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led {
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compatible = "maxim,max77693-led";
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maxim,boost-mode = <LEDS_BOOST_FIXED>;
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maxim,boost-mvout = <5000>;
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maxim,mvsys-min = <2400>;
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camera_flash: flash-led {
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label = "max77693-flash";
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led-sources = <0>, <1>;
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led-max-microamp = <500000>;
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flash-max-microamp = <1250000>;
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flash-max-timeout-us = <1000000>;
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};
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};
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};
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