# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/leds/backlight/qcom-wled.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Binding for Qualcomm Technologies, Inc. WLED driver
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maintainers:
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- Bjorn Andersson <bjorn.andersson@linaro.org>
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- Kiran Gunda <kgunda@codeaurora.org>
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description: |
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WLED (White Light Emitting Diode) driver is used for controlling display
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backlight that is part of PMIC on Qualcomm Technologies, Inc. reference
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platforms. The PMIC is connected to the host processor via SPMI bus.
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properties:
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compatible:
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enum:
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- qcom,pm8941-wled
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- qcom,pmi8998-wled
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- qcom,pm660l-wled
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- qcom,pm8150l-wled
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reg:
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maxItems: 1
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default-brightness:
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description: |
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brightness value on boot.
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label: true
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max-brightness:
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description: |
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Maximum brightness level.
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qcom,cs-out:
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description: |
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enable current sink output.
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This property is supported only for WLED3.
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type: boolean
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qcom,cabc:
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description: |
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enable content adaptive backlight control.
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type: boolean
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qcom,ext-gen:
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description: |
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use externally generated modulator signal to dim.
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This property is supported only for WLED3.
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type: boolean
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qcom,current-limit:
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description: |
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mA; per-string current limit.
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This property is supported only for WLED3.
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$ref: /schemas/types.yaml#/definitions/uint32
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default: 20
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minimum: 0
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maximum: 25
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qcom,current-limit-microamp:
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description: |
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uA; per-string current limit.
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default: 25
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minimum: 0
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maximum: 30000
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multipleOf: 25
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qcom,current-boost-limit:
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description: |
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mA; boost current limit.
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$ref: /schemas/types.yaml#/definitions/uint32
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qcom,switching-freq:
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description: |
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kHz; switching frequency.
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$ref: /schemas/types.yaml#/definitions/uint32
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enum: [ 600, 640, 685, 738, 800, 872, 960, 1066, 1200, 1371, 1600, 1920,
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2400, 3200, 4800, 9600 ]
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qcom,ovp:
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description: |
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V; Over-voltage protection limit.
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This property is supported only for WLED3.
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$ref: /schemas/types.yaml#/definitions/uint32
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enum: [ 27, 29, 32, 35 ]
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default: 29
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qcom,ovp-millivolt:
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description: |
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Over-voltage protection limit. This property is for WLED4 only.
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$ref: /schemas/types.yaml#/definitions/uint32
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enum: [ 18100, 19600, 29600, 31100 ]
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default: 29600
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qcom,num-strings:
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description: |
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number of led strings attached.
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$ref: /schemas/types.yaml#/definitions/uint32
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qcom,enabled-strings:
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description: |
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Array of the WLED strings numbered from 0 to 3. Each
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string of leds are operated individually. Specify the
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list of strings used by the device. Any combination of
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led strings can be used.
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$ref: /schemas/types.yaml#/definitions/uint32-array
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minItems: 1
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maxItems: 4
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qcom,external-pfet:
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description: |
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Specify if external PFET control for short circuit
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protection is used. This property is supported only
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for WLED4.
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type: boolean
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qcom,auto-string-detection:
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description: |
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Enables auto-detection of the WLED string configuration.
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This feature is not supported for WLED3.
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type: boolean
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interrupts:
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minItems: 1
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items:
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- description: over voltage protection interrupt.
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- description: short circuit interrupt.
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interrupt-names:
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minItems: 1
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items:
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- const: ovp
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- const: short
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qcom,modulator-sel:
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description: |
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Selects the modulator used for brightness modulation.
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Allowed values are,
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0 - Modulator A
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1 - Modulator B
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This property is applicable only to WLED5 peripheral.
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$ref: /schemas/types.yaml#/definitions/uint32
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enum: [ 0, 1 ]
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default: 0
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qcom,cabc-sel:
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description: |
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Selects the CABC pin signal used for brightness modulation.
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Allowed values are,
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0 - CABC disabled
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1 - CABC 1
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2 - CABC 2
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3 - External signal (e.g. LPG) is used for dimming
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This property is applicable only to WLED5 peripheral.
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$ref: /schemas/types.yaml#/definitions/uint32
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enum: [ 0, 1, 2, 3 ]
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allOf:
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- if:
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properties:
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compatible:
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contains:
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const: qcom,pm8941-wled
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then:
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properties:
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qcom,current-boost-limit:
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enum: [ 105, 385, 525, 805, 980, 1260, 1400, 1680 ]
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default: 805
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qcom,switching-freq:
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default: 1600
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qcom,num-strings:
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enum: [ 1, 2, 3 ]
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interrupts:
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maxItems: 1
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interrupt-names:
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maxItems: 1
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else:
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properties:
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qcom,current-boost-limit:
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enum: [ 105, 280, 450, 620, 970, 1150, 1300, 1500 ]
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default: 970
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qcom,switching-freq:
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default: 800
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qcom,num-strings:
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enum: [ 1, 2, 3, 4 ]
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interrupts:
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minItems: 2
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interrupt-names:
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minItems: 2
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- if:
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properties:
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compatible:
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contains:
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enum:
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- qcom,pm8150l-wled
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then:
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properties:
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default-brightness:
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minimum: 0
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maximum: 32767
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max-brightness:
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minimum: 0
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maximum: 32767
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else:
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properties:
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default-brightness:
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minimum: 0
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maximum: 4095
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max-brightness:
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minimum: 0
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maximum: 4095
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required:
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- compatible
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- reg
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- label
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additionalProperties: false
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examples:
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- |
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backlight@d800 {
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compatible = "qcom,pm8941-wled";
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reg = <0xd800 0x100>;
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label = "backlight";
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qcom,cs-out;
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qcom,current-limit = <20>;
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qcom,current-boost-limit = <805>;
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qcom,switching-freq = <1600>;
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qcom,ovp = <29>;
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qcom,num-strings = <2>;
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qcom,enabled-strings = <0 1>;
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};
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