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|
# 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
reg:
maxItems: 1
default-brightness:
description: |
brightness value on boot.
minimum: 0
maximum: 4095
default: 2048
label: true
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
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
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>;
};
|
