# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) %YAML 1.2 --- $id: http://devicetree.org/schemas/leds/backlight/qcom-wled.yaml# $schema: http://devicetree.org/meta-schemas/core.yaml# title: Qualcomm Technologies, Inc. WLED driver maintainers: - Bjorn Andersson - Kiran Gunda description: | 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. properties: compatible: enum: - qcom,pm8941-wled - qcom,pmi8950-wled - qcom,pmi8994-wled - qcom,pmi8998-wled - qcom,pm660l-wled - qcom,pm6150l-wled - qcom,pm8150l-wled reg: minItems: 1 maxItems: 2 default-brightness: description: | brightness value on boot. label: true max-brightness: description: | Maximum brightness level. qcom,cs-out: description: | enable current sink output. This property is supported only for WLED3. type: boolean qcom,cabc: description: | enable content adaptive backlight control. type: boolean qcom,ext-gen: description: | use externally generated modulator signal to dim. This property is supported only for WLED3. type: boolean qcom,current-limit: description: | mA; per-string current limit. This property is supported only for WLED3. $ref: /schemas/types.yaml#/definitions/uint32 default: 20 minimum: 0 maximum: 25 qcom,current-limit-microamp: description: | uA; per-string current limit. default: 25 minimum: 0 maximum: 30000 multipleOf: 25 qcom,current-boost-limit: description: | mA; boost current limit. $ref: /schemas/types.yaml#/definitions/uint32 qcom,switching-freq: description: | kHz; switching frequency. $ref: /schemas/types.yaml#/definitions/uint32 enum: [ 600, 640, 685, 738, 800, 872, 960, 1066, 1200, 1371, 1600, 1920, 2400, 3200, 4800, 9600 ] qcom,ovp: description: | V; Over-voltage protection limit. This property is supported only for WLED3. $ref: /schemas/types.yaml#/definitions/uint32 enum: [ 27, 29, 32, 35 ] default: 29 qcom,ovp-millivolt: description: | Over-voltage protection limit. This property is for WLED4 only. $ref: /schemas/types.yaml#/definitions/uint32 enum: [ 18100, 19600, 29600, 31100 ] default: 29600 qcom,num-strings: description: | number of led strings attached. $ref: /schemas/types.yaml#/definitions/uint32 qcom,enabled-strings: description: | 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. $ref: /schemas/types.yaml#/definitions/uint32-array minItems: 1 maxItems: 4 qcom,external-pfet: description: | Specify if external PFET control for short circuit protection is used. This property is supported only for WLED4. type: boolean qcom,auto-string-detection: description: | Enables auto-detection of the WLED string configuration. This feature is not supported for WLED3. type: boolean interrupts: minItems: 1 items: - description: over voltage protection interrupt. - description: short circuit interrupt. interrupt-names: minItems: 1 items: - const: ovp - const: short qcom,modulator-sel: description: | Selects the modulator used for brightness modulation. Allowed values are, 0 - Modulator A 1 - Modulator B This property is applicable only to WLED5 peripheral. $ref: /schemas/types.yaml#/definitions/uint32 enum: [ 0, 1 ] default: 0 qcom,cabc-sel: description: | Selects the CABC pin signal used for brightness modulation. Allowed values are, 0 - CABC disabled 1 - CABC 1 2 - CABC 2 3 - External signal (e.g. LPG) is used for dimming This property is applicable only to WLED5 peripheral. $ref: /schemas/types.yaml#/definitions/uint32 enum: [ 0, 1, 2, 3 ] allOf: - if: properties: compatible: contains: const: qcom,pm8941-wled then: properties: reg: maxItems: 1 qcom,current-boost-limit: enum: [ 105, 385, 525, 805, 980, 1260, 1400, 1680 ] default: 805 qcom,switching-freq: default: 1600 qcom,num-strings: enum: [ 1, 2, 3 ] interrupts: maxItems: 1 interrupt-names: maxItems: 1 else: properties: reg: minItems: 2 qcom,current-boost-limit: enum: [ 105, 280, 450, 620, 970, 1150, 1300, 1500 ] default: 970 qcom,switching-freq: default: 800 qcom,num-strings: enum: [ 1, 2, 3, 4 ] interrupts: minItems: 2 interrupt-names: minItems: 2 - if: properties: compatible: contains: enum: - qcom,pm8150l-wled then: properties: default-brightness: minimum: 0 maximum: 32767 max-brightness: minimum: 0 maximum: 32767 else: properties: default-brightness: minimum: 0 maximum: 4095 max-brightness: minimum: 0 maximum: 4095 required: - compatible - reg - label additionalProperties: false examples: - | backlight@d800 { compatible = "qcom,pm8941-wled"; reg = <0xd800 0x100>; 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>; };