98 lines
4.5 KiB
Plaintext
98 lines
4.5 KiB
Plaintext
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SMB135x battery charger
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SMB135x is a single-cell switching mode battery charger. It can charge
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the battery and power the system via the USB and AC adapter input.
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The smb135x interface is via I2C bus.
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Required Properties:
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- compatible: Must be "qcom,smb1357-charger", "qcom,smb1358-charger"
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or "qcom,smb1359-charger".
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- reg: The device 7-bit I2C address.
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Optional Properties:
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- interrupts This indicates the IRQ number of the GPIO
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connected to the STAT pin.
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- qcom,bms-psy-name the psy name to use for reporting battery capacity. If left
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unspecified it uses a preprogrammed default value.
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- qcom,float-voltage-mv Float Voltage in mV - the maximum voltage up to which
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the battery is charged. Supported range 3600mV to 4500mV
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- qcom,charging-timeout Maximum duration in minutes that a single charge
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cycle may last. Supported values are: 0, 192, 384,
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768, and 1536. A value of 0 means that no
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charge cycle timeout is used and charging can
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continue indefinitely.
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- qcom,dc-psy-type The type of charger connected to the DC path.
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Can be "Mains" or "Wireless"
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- qcom,dc-psy-ma The current in mA dc path can support. Must be specified if
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dc-psy-type is specified. Valid range 300mA to 2000mA.
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- qcom,charging-disabled Set this if charging should be disabled in the build
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by default. Useful in usecases where battery current
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needs to be profiled even when USB is present.
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- qcom,recharge-thresh-mv Specifies the minimum voltage drop in millivolts
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below the float voltage that is required in
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order to initiate a new charging cycle.
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Supported values are: 50, 100, 200 and 300mV.
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- qcom,bmd-algo-disabled Indicates if the battery missing detection algorithm
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is disabled. If this node is present SMB uses
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the THERM pin for battery missing detection.
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- qcom,iterm-ma Specifies the termination current to indicate end-of-charge.
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Possible values in mA - 50, 100, 150, 200, 250, 300, 500, 600.
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- qcom,iterm-disabled Disables the termination current feature. This is a bool
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property.
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- qcom,soft-vfloat-comp-disabled Set this property when the battery is powered via external
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source and could go above the float voltage. smb135x chips
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go in to unintentional reverse boost in such a situation and
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the float voltage compensation needs to be disabled to avoid
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that reverse boost.
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- qcom,soft-current-comp-disabled Set this property to disable charging current compensation
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if battery temperature exceeds soft JEITA thresholds.
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- qcom,gamma-setting Array of gamma values for JEITA. The sequence is
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<"Cold Hard" "Hot Hard" "Cold Soft" "Hot Soft">. Gamma value
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indicates the ratio of the pull up resistors and NTC
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resistor in battery pack. There are 4 options refering to
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the graphic user interface.
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- qcom,thermal-mitigation: Array of input current limit values for different
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system thermal mitigation level.
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- regulator-name A string used as a descriptive name for OTG regulator.
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- therm-bias-supply The supply that provides bias voltage to the battery
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thermistor. This is useful in designs that do not use the SYSON
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pin to bias the thermistor.
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- usb-pullup-supply The supply regulator that act as pull-up for USB data lines.
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- qcom,parallel-charger: A flag to indicate if the charger merely assists for USB
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charging. In this case the input current from USB is split
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between a main charger and smb135x for reducing thermal impact
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of high current charging from USB path.
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- qcom,inhibit-disabled: Disables the charger-inhibit function.
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- qcom,bms-controlled-charging: This property enables BMS to control EOC and
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recharge. BMS and charger communicates with each
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other via power_supply framework. This
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property should be used with 'qcom,iterm-disabled'
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to ensure EOC detection in charger is
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disabled.
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- qcom,fastchg-ma: Specifies the maximum fastcharge current.
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The possible range for fastcharge current is
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from 300mA to 3000mA.
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- qcom,id-line-not-connected: Specifies if smb135x charger is not monitoring the USB_ID line.
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Example:
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i2c@f9967000 {
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smb1357-charger@1b {
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compatible = "qcom,smb1357-charger";
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reg = <0x1b>;
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interrupt-parent = <&spmi_bus>;
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interrupts = <0x00 0xCD 0>;
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qcom,float-voltage-mv = <4200>;
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qcom,iterm-ma = <100>;
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qcom,dc-psy-type = <8>;
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qcom,dc-psy-ma = <800>;
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qcom,charging-disabled;
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qcom,recharge-thresh-mv = <100>;
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regulator-name = "smb1357-otg";
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qcom,thermal-mitigation = <1500 700 600 325>;
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qcom,gamma-setting = <3 2 0 2>;
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qcom,fastchg-ma = <3000>;
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};
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};
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