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Diffstat (limited to 'Documentation/devicetree/bindings/leds/backlight/qcom-wled.yaml')
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diff --git a/Documentation/devicetree/bindings/leds/backlight/qcom-wled.yaml b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.yaml new file mode 100644 index 000000000000..01c7d93dc658 --- /dev/null +++ b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.yaml @@ -0,0 +1,261 @@ +# 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: Binding for Qualcomm Technologies, Inc. WLED driver + +maintainers: + - Bjorn Andersson <bjorn.andersson@linaro.org> + - Kiran Gunda <kgunda@codeaurora.org> + +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,pmi8998-wled + - qcom,pm660l-wled + - qcom,pm8150l-wled + + reg: + maxItems: 1 + + 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. + allOf: + - $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. + allOf: + - $ref: /schemas/types.yaml#/definitions/uint32 + + qcom,switching-freq: + description: | + kHz; switching frequency. + allOf: + - $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. + allOf: + - $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. + allOf: + - $ref: /schemas/types.yaml#/definitions/uint32 + - enum: [ 18100, 19600, 29600, 31100 ] + - default: 29600 + + qcom,num-strings: + description: | + number of led strings attached. + allOf: + - $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. + allOf: + - $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. + allOf: + - $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. + allOf: + - $ref: /schemas/types.yaml#/definitions/uint32 + - enum: [ 0, 1, 2, 3 ] + +allOf: + - if: + properties: + compatible: + contains: + const: qcom,pm8941-wled + + then: + properties: + 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: + 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>; + }; |