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Binding for Qualcomm Technologies, Inc. WLED driver
WLED (White Light Emitting Diode) driver is used for controlling display
backlight that is part of PMIC on Qualcomm Technologies, Inc. reference
platforms. The PMIC is connected to the host processor via SPMI bus.
- compatible
Usage: required
Value type: <string>
Definition: should be one of:
"qcom,pm8941-wled"
"qcom,pmi8998-wled"
"qcom,pm660l-wled"
- reg
Usage: required
Value type: <prop encoded array>
Definition: Base address of the WLED modules.
- default-brightness
Usage: optional
Value type: <u32>
Definition: brightness value on boot, value from: 0-4095.
Default: 2048
- label
Usage: required
Value type: <string>
Definition: The name of the backlight device
- qcom,cs-out
Usage: optional
Value type: <bool>
Definition: enable current sink output.
This property is supported only for PM8941.
- qcom,cabc
Usage: optional
Value type: <bool>
Definition: enable content adaptive backlight control.
- qcom,ext-gen
Usage: optional
Value type: <bool>
Definition: use externally generated modulator signal to dim.
This property is supported only for PM8941.
- qcom,current-limit
Usage: optional
Value type: <u32>
Definition: mA; per-string current limit; value from 0 to 25 with
1 mA step. Default 20 mA.
This property is supported only for pm8941.
- qcom,current-limit-microamp
Usage: optional
Value type: <u32>
Definition: uA; per-string current limit; value from 0 to 30000 with
2500 uA step. Default 25 mA.
- qcom,current-boost-limit
Usage: optional
Value type: <u32>
Definition: mA; boost current limit.
For pm8941: one of: 105, 385, 525, 805, 980, 1260, 1400,
1680. Default: 805 mA.
For pmi8998: one of: 105, 280, 450, 620, 970, 1150, 1300,
1500. Default: 970 mA.
- qcom,switching-freq
Usage: optional
Value type: <u32>
Definition: kHz; switching frequency; one of: 600, 640, 685, 738,
800, 872, 960, 1066, 1200, 1371, 1600, 1920, 2400, 3200,
4800, 9600.
Default: for pm8941: 1600 kHz
for pmi8998: 800 kHz
- qcom,ovp
Usage: optional
Value type: <u32>
Definition: V; Over-voltage protection limit; one of:
27, 29, 32, 35. Default: 29V
This property is supported only for PM8941.
- qcom,ovp-millivolt
Usage: optional
Value type: <u32>
Definition: mV; Over-voltage protection limit;
For pmi8998: one of 18100, 19600, 29600, 31100.
Default 29600 mV.
If this property is not specified for PM8941, it
falls back to "qcom,ovp" property.
- qcom,num-strings
Usage: optional
Value type: <u32>
Definition: #; number of led strings attached;
value: For PM8941 from 1 to 3. Default: 2
For PMI8998 from 1 to 4.
- interrupts
Usage: optional
Value type: <prop encoded array>
Definition: Interrupts associated with WLED. This should be
"short" and "ovp" interrupts. Interrupts can be
specified as per the encoding listed under
Documentation/devicetree/bindings/spmi/
qcom,spmi-pmic-arb.txt.
- interrupt-names
Usage: optional
Value type: <string>
Definition: Interrupt names associated with the interrupts.
Must be "short" and "ovp". The short circuit detection
is not supported for PM8941.
- qcom,enabled-strings
Usage: optional
Value tyoe: <u32 array>
Definition: Array of the WLED strings numbered from 0 to 3. Each
string of leds are operated individually. Specify the
list of strings used by the device. Any combination of
led strings can be used.
- qcom,external-pfet
Usage: optional
Value type: <bool>
Definition: Specify if external PFET control for short circuit
protection is used. This property is supported only
for PMI8998.
- qcom,auto-string-detection
Usage: optional
Value type: <bool>
Definition: Enables auto-detection of the WLED string configuration.
This feature is not supported for PM8941.
Example:
pm8941-wled@d800 {
compatible = "qcom,pm8941-wled";
reg = <0xd800>;
label = "backlight";
qcom,cs-out;
qcom,current-limit = <20>;
qcom,current-boost-limit = <805>;
qcom,switching-freq = <1600>;
qcom,ovp = <29>;
qcom,num-strings = <2>;
qcom,enabled-strings = <0 1>;
};
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