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lastdragon
2026-09-06 12:53:21 -06:00
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linux-7.2.3/Documentation/devicetree/bindings/leds/backlight/88pm860x.txt
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88pm860x-backlight bindings
Optional properties:
- marvell,88pm860x-iset: Current supplies on backlight device.
- marvell,88pm860x-pwm: PWM frequency on backlight device.
Example:
backlights {
backlight-0 {
marvell,88pm860x-iset = <4>;
marvell,88pm860x-pwm = <3>;
};
backlight-2 {
};
linux-7.2.3/Documentation/devicetree/bindings/leds/backlight/apple,dwi-bl.yaml
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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/backlight/apple,dwi-bl.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Apple DWI 2-Wire Interface Backlight Controller
maintainers:
- Nick Chan <towinchenmi@gmail.com>
description:
Apple SoCs contain a 2-wire interface called DWI. On some Apple iPhones,
iPads and iPod touches with a LCD display, 1-2 backlight controllers
are connected via DWI. Interfacing with DWI controls all backlight
controllers at the same time. As such, the backlight controllers are
treated as a single controller regardless of the underlying
configuration.
allOf:
- $ref: common.yaml#
properties:
compatible:
items:
- enum:
- apple,s5l8960x-dwi-bl
- apple,t7000-dwi-bl
- apple,s8000-dwi-bl
- apple,t8010-dwi-bl
- apple,t8015-dwi-bl
- const: apple,dwi-bl
reg:
maxItems: 1
power-domains:
maxItems: 1
required:
- compatible
- reg
unevaluatedProperties: false
examples:
- |
soc {
#address-cells = <2>;
#size-cells = <2>;
dwi_bl: backlight@20e200010 {
compatible = "apple,s5l8960x-dwi-bl", "apple,dwi-bl";
reg = <0x2 0x0e200010 0x0 0x8>;
power-domains = <&ps_dwi>;
};
};
linux-7.2.3/Documentation/devicetree/bindings/leds/backlight/arc,arc2c0608.yaml
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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/backlight/arc,arc2c0608.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: ArcticSand arc2c0608 LED driver
description: |
The ArcticSand arc2c0608 LED driver provides ultra
efficient notebook backlighting. Optional properties not
specified will default to values in IC EPROM.
Datasheet:
https://www.murata.com/-/media/webrenewal/products/power/power-semiconductor/overview/lineup/led-boost/arc2/arc2c0608.ashx.
maintainers:
- Brian Dodge <bdodge@arcticsand.com>
allOf:
- $ref: /schemas/leds/common.yaml
properties:
compatible:
const: arc,arc2c0608
reg:
maxItems: 1
default-brightness:
$ref: /schemas/types.yaml#/definitions/uint32
minimum: 0
maximum: 4095
led-sources:
$ref: /schemas/types.yaml#/definitions/uint32-array
description: List of enabled channels
items:
enum: [0, 1, 2, 3, 4, 5]
minItems: 1
uniqueItems: true
arc,led-config-0:
$ref: /schemas/types.yaml#/definitions/uint32
description: Fading speed (period between intensity
steps)
arc,led-config-1:
$ref: /schemas/types.yaml#/definitions/uint32
description: If set, sets ILED_CONFIG register. Used for
fine tuning the maximum LED current.
arc,dim-freq:
$ref: /schemas/types.yaml#/definitions/uint32
description: PWM mode frequency setting (bits [3:0] used)
arc,comp-config:
$ref: /schemas/types.yaml#/definitions/uint32
description: Setting for register CONFIG_COMP which
controls internal resitances, feed forward freqs,
and initial VOUT at startup. Consult the datasheet.
arc,filter-config:
$ref: /schemas/types.yaml#/definitions/uint32
description: RC and PWM Filter settings.
Bit Assignment
7654 3 2 1 0
xxxx RCF1 RCF0 PWM1 PWM0
RCF statuses PWM Filter Statues
00 = OFF (default) 00 = OFF (default)
01 = LOW 01 = 2 STEPS
10 - MEDIUM 10 = 4 STEPS
11 = HIGH 11 = 8 STEPS
arc,trim-config:
$ref: /schemas/types.yaml#/definitions/uint32
description: Sets percentage increase of Maximum LED
Current.
0x00 = 0% increase.
0x20 = 20.2%.
0x3F = 41.5%
label: true
linux,default-trigger: true
additionalProperties: false
required:
- compatible
- reg
examples:
- |
i2c {
#address-cells = <1>;
#size-cells = <0>;
led-controller@30 {
compatible = "arc,arc2c0608";
reg = <0x30>;
default-brightness = <500>;
label = "lcd-backlight";
linux,default-trigger = "backlight";
led-sources = <0 1 2 5>;
};
};
...
linux-7.2.3/Documentation/devicetree/bindings/leds/backlight/awinic,aw99706.yaml
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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/backlight/awinic,aw99706.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Awinic AW99706 6-channel WLED Backlight Driver
maintainers:
- Junjie Cao <caojunjie650@gmail.com>
allOf:
- $ref: common.yaml#
properties:
compatible:
const: awinic,aw99706
reg:
maxItems: 1
enable-gpios:
description: GPIO to use to enable/disable the backlight (HWEN pin).
maxItems: 1
awinic,dim-mode:
$ref: /schemas/types.yaml#/definitions/uint32
description: >
Select dimming mode of the device.
0 = Bypass mode.
1 = DC mode.
2 = MIX mode(PWM at low brightness and DC at high brightness).
3 = MIX-26k mode(MIX mode with different PWM frequency).
enum: [ 0, 1, 2, 3 ]
default: 1
awinic,sw-freq-hz:
description: Boost switching frequency in Hz.
enum: [ 300000, 400000, 500000, 600000, 660000, 750000, 850000, 1000000,
1200000, 1330000, 1500000, 1700000 ]
default: 750000
awinic,sw-ilmt-microamp:
description: Switching current limitation in uA.
enum: [ 1500000, 2000000, 2500000, 3000000 ]
default: 3000000
awinic,iled-max-microamp:
description: Maximum LED current setting in uA.
minimum: 5000
maximum: 50000
multipleOf: 500
default: 20000
awinic,uvlo-thres-microvolt:
description: UVLO(Under Voltage Lock Out) in uV.
enum: [ 2200000, 5000000 ]
default: 2200000
awinic,ramp-ctl:
$ref: /schemas/types.yaml#/definitions/uint32
description: >
Select ramp control and filter of the device.
0 = Fade in/fade out.
1 = Light filter.
2 = Medium filter.
3 = Heavy filter.
enum: [ 0, 1, 2, 3 ]
default: 2
required:
- compatible
- reg
- enable-gpios
unevaluatedProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
i2c {
#address-cells = <1>;
#size-cells = <0>;
backlight@76 {
compatible = "awinic,aw99706";
reg = <0x76>;
enable-gpios = <&tlmm 88 GPIO_ACTIVE_HIGH>;
default-brightness = <2047>;
max-brightness = <4095>;
awinic,dim-mode = <1>;
awinic,sw-freq-hz = <750000>;
awinic,sw-ilmt-microamp = <3000000>;
awinic,uvlo-thres-microvolt = <2200000>;
awinic,iled-max-microamp = <20000>;
awinic,ramp-ctl = <2>;
};
};
...
linux-7.2.3/Documentation/devicetree/bindings/leds/backlight/common.yaml
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/backlight/common.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Common backlight properties
maintainers:
- Lee Jones <lee@kernel.org>
- Daniel Thompson <daniel.thompson@linaro.org>
- Jingoo Han <jingoohan1@gmail.com>
description:
Backlight devices provide backlight for different types of graphical
displays. They are typically but not necessarily implemented using a white
LED powered by a boost converter.
properties:
default-brightness:
description:
The default brightness that should be applied to the LED by the operating
system on start-up. The brightness should not exceed the brightness the
LED can provide.
$ref: /schemas/types.yaml#/definitions/uint32
max-brightness:
description:
Normally the maximum brightness is determined by the hardware and this
property is not required. This property is used to put a software limit
on the brightness apart from what the driver says, as it could happen
that a LED can be made so bright that it gets damaged or causes damage
due to restrictions in a specific system, such as mounting conditions.
$ref: /schemas/types.yaml#/definitions/uint32
brightness-levels:
description:
Array of distinct brightness levels. The levels must be in the range
accepted by the underlying LED device. Typically these are in the range
from 0 to 255, but any range starting at 0 will do, as long as they are
accepted by the LED.
The 0 value means a 0% of brightness (darkest/off), while the last value
in the array represents a full 100% brightness (brightest).
If this array is not provided, the driver default mapping is used.
$ref: /schemas/types.yaml#/definitions/uint32-array
default-brightness-level:
description:
The default brightness level (index into the array defined by the
"brightness-levels" property).
$ref: /schemas/types.yaml#/definitions/uint32
additionalProperties: true
linux-7.2.3/Documentation/devicetree/bindings/leds/backlight/gpio-backlight.yaml
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# SPDX-License-Identifier: GPL-2.0-only
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/backlight/gpio-backlight.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: gpio-backlight
maintainers:
- Lee Jones <lee@kernel.org>
- Daniel Thompson <daniel.thompson@linaro.org>
- Jingoo Han <jingoohan1@gmail.com>
properties:
compatible:
const: gpio-backlight
gpios:
description: The gpio that is used for enabling/disabling the backlight.
maxItems: 1
default-on:
description: enable the backlight at boot.
type: boolean
required:
- compatible
- gpios
additionalProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
backlight {
compatible = "gpio-backlight";
gpios = <&gpio3 4 GPIO_ACTIVE_HIGH>;
default-on;
};
...
linux-7.2.3/Documentation/devicetree/bindings/leds/backlight/kinetic,ktd253.yaml
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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/backlight/kinetic,ktd253.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Kinetic Technologies KTD253 and KTD259 one-wire backlight
maintainers:
- Linus Walleij <linusw@kernel.org>
description: |
The Kinetic Technologies KTD253 and KTD259 are white LED backlights
controlled by a single GPIO line. If you just turn on the backlight
it goes to maximum backlight then you can set the level of backlight
using pulses on the enable wire. This is sometimes referred to as
"expresswire".
allOf:
- $ref: common.yaml#
properties:
compatible:
items:
- enum:
- kinetic,ktd253
- kinetic,ktd259
enable-gpios:
description: GPIO to use to enable/disable and dim the backlight.
maxItems: 1
default-brightness: true
max-brightness: true
required:
- compatible
- enable-gpios
additionalProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
backlight {
compatible = "kinetic,ktd253";
enable-gpios = <&gpio2 5 GPIO_ACTIVE_HIGH>;
default-brightness = <13>;
};
linux-7.2.3/Documentation/devicetree/bindings/leds/backlight/kinetic,ktd2801.yaml
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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/backlight/kinetic,ktd2801.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Kinetic Technologies KTD2801 one-wire backlight
maintainers:
- Duje Mihanović <duje.mihanovic@skole.hr>
description: |
The Kinetic Technologies KTD2801 is a LED backlight driver controlled
by a single GPIO line. The driver can be controlled with a PWM signal
or by pulsing the GPIO line to set the backlight level. This is called
"ExpressWire".
allOf:
- $ref: common.yaml#
properties:
compatible:
const: kinetic,ktd2801
ctrl-gpios:
maxItems: 1
default-brightness: true
max-brightness: true
required:
- compatible
- ctrl-gpios
additionalProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
backlight {
compatible = "kinetic,ktd2801";
ctrl-gpios = <&gpio 97 GPIO_ACTIVE_HIGH>;
max-brightness = <210>;
default-brightness = <100>;
};
linux-7.2.3/Documentation/devicetree/bindings/leds/backlight/kinetic,ktz8866.yaml
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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/backlight/kinetic,ktz8866.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Kinetic Technologies KTZ8866 backlight
maintainers:
- Jianhua Lu <lujianhua000@gmail.com>
description: |
The Kinetic Technologies KTZ8866 is a high efficiency 6-channels-current-sinks
led backlight with dual lcd bias power.
https://www.kinet-ic.com/ktz8866/
allOf:
- $ref: common.yaml#
properties:
compatible:
const: kinetic,ktz8866
reg:
maxItems: 1
vddpos-supply:
description: positive boost supply regulator.
vddneg-supply:
description: negative boost supply regulator.
enable-gpios:
description: GPIO to use to enable/disable the backlight (HWEN pin).
maxItems: 1
current-num-sinks:
description: number of the LED current sinks' channels.
$ref: /schemas/types.yaml#/definitions/uint32
enum: [1, 2, 3, 4, 5, 6]
kinetic,current-ramp-delay-ms:
description: |
LED current ramping delay time in milliseconds, note that the
case 1 will be mapped to 1μs.
enum: [1, 2, 4, 8, 16, 32, 64, 128, 192, 256, 320, 384, 448, 512, 576, 640]
kinetic,led-enable-ramp-delay-ms:
description: |
LED on/off ramping delay time in milliseconds, note that the case 0 will be
mapped to 512μs because ktz8866 can't ramp faster than it.
enum: [0, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384]
kinetic,enable-lcd-bias:
description: Set if we want to output bias power supply for LCD.
type: boolean
required:
- compatible
- reg
- vddpos-supply
- vddneg-supply
- enable-gpios
unevaluatedProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
i2c {
#address-cells = <1>;
#size-cells = <0>;
backlight@11 {
compatible = "kinetic,ktz8866";
reg = <0x11>;
vddpos-supply = <&bl_vddpos_5p5>;
vddneg-supply = <&bl_vddneg_5p5>;
enable-gpios = <&tlmm 139 GPIO_ACTIVE_HIGH>;
current-num-sinks = <5>;
kinetic,current-ramp-delay-ms = <128>;
kinetic,led-enable-ramp-delay-ms = <1>;
kinetic,enable-lcd-bias;
};
};
linux-7.2.3/Documentation/devicetree/bindings/leds/backlight/led-backlight.yaml
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# SPDX-License-Identifier: GPL-2.0-only
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/backlight/led-backlight.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: led-backlight
maintainers:
- Lee Jones <lee@kernel.org>
- Daniel Thompson <daniel.thompson@linaro.org>
- Jingoo Han <jingoohan1@gmail.com>
description:
This binding is used to describe a basic backlight device made of LEDs. It
can also be used to describe a backlight device controlled by the output of
a LED driver.
allOf:
- $ref: common.yaml#
properties:
compatible:
const: led-backlight
leds: true
required:
- compatible
- leds
unevaluatedProperties: false
examples:
- |
backlight {
compatible = "led-backlight";
leds = <&led1>, <&led2>;
brightness-levels = <0 4 8 16 32 64 128 255>;
default-brightness-level = <6>;
};
...
linux-7.2.3/Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml
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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/backlight/lm3630a-backlight.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: TI LM3630A High-Efficiency Dual-String White LED
maintainers:
- Lee Jones <lee@kernel.org>
- Daniel Thompson <daniel.thompson@linaro.org>
- Jingoo Han <jingoohan1@gmail.com>
description: |
The LM3630A is a current-mode boost converter which supplies the power and
controls the current in up to two strings of 10 LEDs per string.
https://www.ti.com/product/LM3630A
properties:
compatible:
const: ti,lm3630a
reg:
maxItems: 1
'#address-cells':
const: 1
'#size-cells':
const: 0
enable-gpios:
description: GPIO to use to enable/disable the backlight (HWEN pin).
maxItems: 1
required:
- compatible
- reg
- '#address-cells'
- '#size-cells'
patternProperties:
"^led@[01]$":
type: object
description: |
Properties for a string of connected LEDs.
properties:
reg:
description: |
The control bank that is used to program the two current sinks. The
LM3630A has two control banks (A and B) and are represented as 0 or 1
in this property. The two current sinks can be controlled
independently with both banks, or bank A can be configured to control
both sinks with the led-sources property.
minimum: 0
maximum: 1
label:
maxItems: 1
led-sources:
allOf:
- minItems: 1
maxItems: 2
items:
minimum: 0
maximum: 1
default-brightness:
description: Default brightness level on boot.
minimum: 0
maximum: 255
max-brightness:
description: Maximum brightness that is allowed during runtime.
minimum: 0
maximum: 255
ti,linear-mapping-mode:
description: |
Enable linear mapping mode. If disabled, then it will use exponential
mapping mode in which the ramp up/down appears to have a more uniform
transition to the human eye.
type: boolean
required:
- reg
additionalProperties: false
additionalProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
i2c {
#address-cells = <1>;
#size-cells = <0>;
led-controller@38 {
compatible = "ti,lm3630a";
reg = <0x38>;
enable-gpios = <&gpio2 5 GPIO_ACTIVE_HIGH>;
#address-cells = <1>;
#size-cells = <0>;
led@0 {
reg = <0>;
led-sources = <0 1>;
label = "lcd-backlight";
default-brightness = <200>;
max-brightness = <255>;
};
};
};
- |
i2c {
#address-cells = <1>;
#size-cells = <0>;
led-controller@38 {
compatible = "ti,lm3630a";
reg = <0x38>;
#address-cells = <1>;
#size-cells = <0>;
led@0 {
reg = <0>;
default-brightness = <150>;
ti,linear-mapping-mode;
};
led@1 {
reg = <1>;
default-brightness = <225>;
ti,linear-mapping-mode;
};
};
};
linux-7.2.3/Documentation/devicetree/bindings/leds/backlight/lp855x-backlight.yaml
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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/backlight/lp855x-backlight.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Texas Instruments LP855X backlight controllers
maintainers:
- Artur Weber <aweber.kernel@gmail.com>
properties:
compatible:
enum:
- ti,lp8550
- ti,lp8551
- ti,lp8552
- ti,lp8553
- ti,lp8555
- ti,lp8556
- ti,lp8557
reg:
maxItems: 1
dev-ctrl:
$ref: /schemas/types.yaml#/definitions/uint8
description:
Value of device control register. This is a device-specific value.
bl-name:
$ref: /schemas/types.yaml#/definitions/string
description: Backlight device name.
init-brt:
$ref: /schemas/types.yaml#/definitions/uint8
description: Initial value of backlight brightness.
power-supply:
description: Regulator which controls the 3V rail.
enable-supply:
description: Regulator which controls the EN/VDDIO input.
pwms:
maxItems: 1
description: |
PWM channel to use for controlling the backlight; setting this
enables the PWM-based backlight control mode.
pwm-names: true
pwm-period:
$ref: /schemas/types.yaml#/definitions/uint32
description:
PWM period value. Deprecated; set the period value in the pwms
property instead.
deprecated: true
patternProperties:
"^rom-[0-9a-f]{2}h$":
type: object
description: Nodes containing the values of configuration registers.
additionalProperties: false
properties:
rom-addr:
$ref: /schemas/types.yaml#/definitions/uint8
description: Register address of ROM area to be updated.
rom-val:
$ref: /schemas/types.yaml#/definitions/uint8
description: Value to write to the ROM register.
required:
- compatible
- reg
- dev-ctrl
unevaluatedProperties: false
examples:
- |
i2c {
#address-cells = <1>;
#size-cells = <0>;
backlight@2c {
compatible = "ti,lp8555";
reg = <0x2c>;
dev-ctrl = /bits/ 8 <0x00>;
pwms = <&pwm 0 10000>;
pwm-names = "lp8555";
/* 4V OV, 4 output LED0 string enabled */
rom-14h {
rom-addr = /bits/ 8 <0x14>;
rom-val = /bits/ 8 <0xcf>;
};
/* Heavy smoothing, 24ms ramp time step */
rom-15h {
rom-addr = /bits/ 8 <0x15>;
rom-val = /bits/ 8 <0xc7>;
};
/* 4 output LED1 string enabled */
rom-19h {
rom-addr = /bits/ 8 <0x19>;
rom-val = /bits/ 8 <0x0f>;
};
};
};
- |
i2c {
#address-cells = <1>;
#size-cells = <0>;
backlight@2c {
compatible = "ti,lp8556";
reg = <0x2c>;
bl-name = "lcd-bl";
dev-ctrl = /bits/ 8 <0x85>;
init-brt = /bits/ 8 <0x10>;
};
};
- |
i2c {
#address-cells = <1>;
#size-cells = <0>;
backlight@2c {
compatible = "ti,lp8557";
reg = <0x2c>;
enable-supply = <&backlight_vddio>;
power-supply = <&backlight_vdd>;
dev-ctrl = /bits/ 8 <0x41>;
init-brt = /bits/ 8 <0x0a>;
/* 4V OV, 4 output LED string enabled */
rom-14h {
rom-addr = /bits/ 8 <0x14>;
rom-val = /bits/ 8 <0xcf>;
};
};
};
linux-7.2.3/Documentation/devicetree/bindings/leds/backlight/maxim,max25014.yaml
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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/backlight/maxim,max25014.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Maxim max25014 backlight controller
maintainers:
- Maud Spierings <maudspierings@gocontroll.com>
properties:
compatible:
enum:
- maxim,max25014
reg:
maxItems: 1
default-brightness:
minimum: 0
maximum: 100
default: 50
enable-gpios:
maxItems: 1
interrupts:
maxItems: 1
power-supply:
description: Regulator which controls the boost converter input rail.
pwms:
maxItems: 1
maxim,iset:
$ref: /schemas/types.yaml#/definitions/uint32
maximum: 15
default: 11
description:
Value of the ISET field in the ISET register. This controls the current
scale of the outputs, a higher number means more current.
maxim,strings:
$ref: /schemas/types.yaml#/definitions/uint32-array
description:
A 4-bit bitfield that describes which led strings to turn on.
minItems: 4
maxItems: 4
items:
maximum: 1
default:
[1 1 1 1]
required:
- compatible
- reg
additionalProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/interrupt-controller/irq.h>
i2c {
#address-cells = <1>;
#size-cells = <0>;
backlight@6f {
compatible = "maxim,max25014";
reg = <0x6f>;
default-brightness = <50>;
enable-gpios = <&gpio1 4 GPIO_ACTIVE_HIGH>;
interrupt-parent = <&gpio1>;
interrupts = <2 IRQ_TYPE_EDGE_FALLING>;
power-supply = <&reg_backlight>;
pwms = <&pwm1>;
maxim,iset = <7>;
maxim,strings = <1 1 1 0>;
};
};
linux-7.2.3/Documentation/devicetree/bindings/leds/backlight/mediatek,mt6370-backlight.yaml
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/backlight/mediatek,mt6370-backlight.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: MediaTek MT6370 Backlight
maintainers:
- ChiaEn Wu <chiaen_wu@richtek.com>
description: |
This module is part of the MT6370 MFD device.
The MT6370 Backlight WLED driver supports up to a 29V output voltage for
4 channels of 8 series WLEDs. Each channel supports up to 30mA of current
capability with 2048 current steps (11 bits, only for MT6370/MT6371) or
16384 current steps (14 bits, only for MT6372) in exponential or linear
mapping curves.
allOf:
- $ref: common.yaml#
properties:
compatible:
enum:
- mediatek,mt6370-backlight
- mediatek,mt6372-backlight
default-brightness:
minimum: 0
max-brightness:
minimum: 0
enable-gpios:
description: External backlight 'enable' pin
maxItems: 1
mediatek,bled-pwm-enable:
description: |
Enable external PWM input for backlight dimming
type: boolean
mediatek,bled-pwm-hys-enable:
description: |
Enable the backlight input-hysteresis for PWM mode
type: boolean
mediatek,bled-pwm-hys-input-th-steps:
$ref: /schemas/types.yaml#/definitions/uint8
enum: [1, 4, 16, 64]
description: |
The selection of the upper and lower bounds threshold of backlight
PWM resolution. If we choose selection 64, the variation of PWM
resolution needs more than 64 steps.
mediatek,bled-ovp-shutdown:
description: |
Enable the backlight shutdown when OVP level triggered
type: boolean
mediatek,bled-ovp-microvolt:
enum: [17000000, 21000000, 25000000, 29000000]
description: |
Backlight OVP level selection.
mediatek,bled-ocp-shutdown:
description: |
Enable the backlight shutdown when OCP level triggered.
type: boolean
mediatek,bled-ocp-microamp:
enum: [900000, 1200000, 1500000, 1800000]
description: |
Backlight OC level selection.
mediatek,bled-exponential-mode-enable:
description: |
Enable the exponential mode of backlight brightness. If this property
is not enabled, the default is to use linear mode.
type: boolean
mediatek,bled-channel-use:
$ref: /schemas/types.yaml#/definitions/uint8
description: |
Backlight LED channel to be used.
Each bit mapping to:
- 0: CH4
- 1: CH3
- 2: CH2
- 3: CH1
minimum: 1
maximum: 15
if:
properties:
compatible:
contains:
const: mediatek,mt6372-backlight
then:
properties:
default-brightness:
maximum: 16384
max-brightness:
maximum: 16384
else:
properties:
default-brightness:
maximum: 2048
max-brightness:
maximum: 2048
required:
- compatible
- mediatek,bled-channel-use
additionalProperties: false
linux-7.2.3/Documentation/devicetree/bindings/leds/backlight/mps,mp3309c.yaml
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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/backlight/mps,mp3309c.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: MPS MP3309C backlight
maintainers:
- Flavio Suligoi <f.suligoi@asem.it>
description: |
The Monolithic Power (MPS) MP3309C is a WLED step-up converter, featuring a
programmable switching frequency to optimize efficiency.
It supports two different dimming modes:
- analog mode, via I2C commands, as default mode (32 dimming levels)
- PWM controlled mode (optional)
The datasheet is available at:
https://www.monolithicpower.com/en/mp3309c.html
allOf:
- $ref: common.yaml#
properties:
compatible:
const: mps,mp3309c
reg:
maxItems: 1
pwms:
description: if present, the backlight is controlled in PWM mode.
maxItems: 1
enable-gpios:
description: GPIO used to enable the backlight in "analog-i2c" dimming mode.
maxItems: 1
mps,overvoltage-protection-microvolt:
description: Overvoltage protection (13.5V, 24V or 35.5V).
enum: [ 13500000, 24000000, 35500000 ]
default: 35500000
mps,no-sync-mode:
description: disable synchronous rectification mode
type: boolean
required:
- compatible
- reg
unevaluatedProperties: false
examples:
- |
i2c {
#address-cells = <1>;
#size-cells = <0>;
/* Backlight with PWM control */
backlight_pwm: backlight@17 {
compatible = "mps,mp3309c";
reg = <0x17>;
pwms = <&pwm1 0 3333333 0>; /* 300 Hz --> (1/f) * 1*10^9 */
brightness-levels = <0 4 8 16 32 64 128 255>;
default-brightness = <6>;
mps,overvoltage-protection-microvolt = <24000000>;
};
};
linux-7.2.3/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.yaml
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# SPDX-License-Identifier: GPL-2.0-only
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/backlight/pwm-backlight.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: pwm-backlight
maintainers:
- Lee Jones <lee@kernel.org>
- Daniel Thompson <daniel.thompson@linaro.org>
- Jingoo Han <jingoohan1@gmail.com>
allOf:
- $ref: common.yaml#
properties:
compatible:
const: pwm-backlight
pwms:
maxItems: 1
pwm-names: true
power-supply:
description: regulator for supply voltage
enable-gpios:
description:
Contains a single GPIO specifier for the GPIO which enables and disables
the backlight.
maxItems: 1
post-pwm-on-delay-ms:
description:
Delay in ms between setting an initial (non-zero) PWM and enabling the
backlight using GPIO.
pwm-off-delay-ms:
description:
Delay in ms between disabling the backlight using GPIO and setting PWM
value to 0.
num-interpolated-steps:
description:
Number of interpolated steps between each value of brightness-levels
table. This way a high resolution pwm duty cycle can be used without
having to list out every possible value in the brightness-level array.
$ref: /schemas/types.yaml#/definitions/uint32
dependencies:
default-brightness-level: [brightness-levels]
num-interpolated-steps: [brightness-levels]
required:
- compatible
- pwms
unevaluatedProperties: false
examples:
- |
backlight {
compatible = "pwm-backlight";
pwms = <&pwm 0 5000000>;
brightness-levels = <0 4 8 16 32 64 128 255>;
default-brightness-level = <6>;
power-supply = <&vdd_bl_reg>;
enable-gpios = <&gpio 58 0>;
post-pwm-on-delay-ms = <10>;
pwm-off-delay-ms = <10>;
};
- |
// Example using num-interpolation-steps:
backlight {
compatible = "pwm-backlight";
pwms = <&pwm 0 5000000>;
brightness-levels = <0 2048 4096 8192 16384 65535>;
num-interpolated-steps = <2048>;
default-brightness-level = <4096>;
power-supply = <&vdd_bl_reg>;
enable-gpios = <&gpio 58 0>;
};
...
linux-7.2.3/Documentation/devicetree/bindings/leds/backlight/qcom-wled.yaml
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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: Qualcomm Technologies, Inc. WLED driver
maintainers:
- Bjorn Andersson <andersson@kernel.org>
- Kiran Gunda <quic_kgunda@quicinc.com>
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
minimum: 17800
maximum: 31100
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
- if:
properties:
compatible:
contains:
enum:
- qcom,pmi8950-wled
- qcom,pmi8994-wled
then:
properties:
qcom,ovp-millivolt:
enum: [ 17800, 19400, 29500, 31000 ]
default: 29500
else:
properties:
qcom,ovp-millivolt:
enum: [ 18100, 19600, 29600, 31100 ]
default: 29600
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>;
};
linux-7.2.3/Documentation/devicetree/bindings/leds/backlight/richtek,rt4831-backlight.yaml
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/backlight/richtek,rt4831-backlight.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Richtek RT4831 Backlight
maintainers:
- ChiYuan Huang <cy_huang@richtek.com>
description: |
RT4831 is a mutifunctional device that can provide power to the LCD display
and LCD backlight.
For the LCD backlight, it can provide four channel WLED driving capability.
Each channel driving current is up to 30mA
Datasheet is available at
https://www.richtek.com/assets/product_file/RT4831A/DS4831A-05.pdf
allOf:
- $ref: common.yaml#
properties:
compatible:
const: richtek,rt4831-backlight
default-brightness:
minimum: 0
maximum: 2048
max-brightness:
minimum: 0
maximum: 2048
richtek,pwm-enable:
description: |
Specify the backlight dimming following by PWM duty or by SW control.
type: boolean
richtek,bled-ovp-sel:
description: |
Backlight OVP level selection, currently support 17V/21V/25V/29V.
$ref: /schemas/types.yaml#/definitions/uint8
default: 1
minimum: 0
maximum: 3
richtek,bled-ocp-microamp:
description: |
Backlight over current protection level.
enum: [900000, 1200000, 1500000, 1800000]
richtek,channel-use:
description: |
Backlight LED channel to be used.
BIT 0/1/2/3 is used to indicate led channel 1/2/3/4 enable or disable.
$ref: /schemas/types.yaml#/definitions/uint8
minimum: 1
maximum: 15
required:
- compatible
- richtek,channel-use
additionalProperties: false
linux-7.2.3/Documentation/devicetree/bindings/leds/backlight/sky81452-backlight.txt
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SKY81452-backlight bindings
Required properties:
- compatible : Must be "skyworks,sky81452-backlight"
Optional properties:
- name : Name of backlight device. Default is 'lcd-backlight'.
- gpios : GPIO to use to EN pin.
See Documentation/devicetree/bindings/gpio/gpio.txt
- led-sources : List of enabled channels from 0 to 5.
See Documentation/devicetree/bindings/leds/common.txt
- skyworks,ignore-pwm : Ignore both PWM input
- skyworks,dpwm-mode : Enable DPWM dimming mode, otherwise Analog dimming.
- skyworks,phase-shift : Enable phase shift mode
- skyworks,short-detection-threshold-volt
: It should be one of 4, 5, 6 and 7V.
- skyworks,current-limit-mA
: It should be 2300mA or 2750mA.
Example:
backlight {
compatible = "skyworks,sky81452-backlight";
name = "pwm-backlight";
led-sources = <0 1 2 5>;
skyworks,ignore-pwm;
skyworks,phase-shift;
skyworks,current-limit-mA = <2300>;
};
linux-7.2.3/Documentation/devicetree/bindings/leds/backlight/ti,lm3509.yaml
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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/backlight/ti,lm3509.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: TI LM3509 High Efficiency Boost for White LED's and/or OLED Displays
maintainers:
- Patrick Gansterer <paroga@paroga.com>
description:
The LM3509 current mode boost converter offers two separate outputs.
https://www.ti.com/product/LM3509
properties:
compatible:
const: ti,lm3509
reg:
maxItems: 1
"#address-cells":
const: 1
"#size-cells":
const: 0
reset-gpios:
maxItems: 1
ti,brightness-rate-of-change-us:
description: Brightness Rate of Change in microseconds.
enum: [51, 13000, 26000, 52000]
ti,oled-mode:
description: Enable OLED mode.
type: boolean
patternProperties:
"^led@[01]$":
type: object
description: Properties for a string of connected LEDs.
$ref: common.yaml#
properties:
reg:
description:
The control register that is used to program the two current sinks.
The LM3509 has two registers (BMAIN and BSUB) and are represented
as 0 or 1 in this property. The two current sinks can be controlled
independently with both registers, or register BMAIN can be
configured to control both sinks with the led-sources property.
minimum: 0
maximum: 1
label: true
led-sources:
minItems: 1
maxItems: 2
items:
minimum: 0
maximum: 1
default-brightness:
minimum: 0
maximum: 31
default: 18
max-brightness:
minimum: 0
maximum: 31
default: 31
required:
- reg
additionalProperties: false
required:
- compatible
- reg
additionalProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
i2c {
#address-cells = <1>;
#size-cells = <0>;
backlight@36 {
compatible = "ti,lm3509";
reg = <0x36>;
reset-gpios = <&gpio2 5 GPIO_ACTIVE_LOW>;
ti,oled-mode;
ti,brightness-rate-of-change-us = <52000>;
#address-cells = <1>;
#size-cells = <0>;
led@0 {
reg = <0>;
led-sources = <0 1>;
label = "lcd-backlight";
default-brightness = <12>;
max-brightness = <31>;
};
};
};
- |
i2c {
#address-cells = <1>;
#size-cells = <0>;
backlight@36 {
compatible = "ti,lm3509";
reg = <0x36>;
#address-cells = <1>;
#size-cells = <0>;
led@0 {
reg = <0>;
default-brightness = <12>;
};
led@1 {
reg = <1>;
default-brightness = <15>;
};
};
};
linux-7.2.3/Documentation/devicetree/bindings/leds/backlight/ti,lp8864.yaml
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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/backlight/ti,lp8864.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Texas Instruments - LP8864/LP8866 4/6-Channel LED Driver family
maintainers:
- Andrew Davis <afd@ti.com>
- Alexander Sverdlin <alexander.sverdlin@siemens.com>
description: |
LP8866-Q1, LP8866S-Q1, LP8864-Q1, LP8864S-Q1 are display LED-backlight drivers
with 4/6 channels. LED brightness can be controlled globally through the I2C
interface or PWM input.
For more product information please see the links below:
https://www.ti.com/product/LP8864-Q1
https://www.ti.com/product/LP8864S-Q1
https://www.ti.com/product/LP8866-Q1
https://www.ti.com/product/LP8866S-Q1
properties:
compatible:
const: ti,lp8864
reg:
maxItems: 1
description: I2C slave address
enable-gpios:
maxItems: 1
description: GPIO pin to enable (active high) / disable the device
vled-supply:
description: LED supply
led:
type: object
$ref: common.yaml#
properties:
function: true
color: true
label: true
linux,default-trigger: true
additionalProperties: false
required:
- compatible
- reg
- led
additionalProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/leds/common.h>
i2c {
#address-cells = <1>;
#size-cells = <0>;
led-controller@3a {
compatible = "ti,lp8864";
reg = <0x3a>;
enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
vled-supply = <&vbatt>;
led {
function = LED_FUNCTION_BACKLIGHT;
color = <LED_COLOR_ID_WHITE>;
linux,default-trigger = "backlight";
};
};
};
...
linux-7.2.3/Documentation/devicetree/bindings/leds/backlight/tps65217-backlight.txt
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TPS65217 family of regulators
The TPS65217 chip contains a boost converter and current sinks which can be
used to drive LEDs for use as backlights.
Required properties:
- compatible: "ti,tps65217"
- reg: I2C slave address
- backlight: node for specifying WLED1 and WLED2 lines in TPS65217
- isel: selection bit, valid values: 1 for ISEL1 (low-level) and 2 for ISEL2 (high-level)
- fdim: PWM dimming frequency, valid values: 100, 200, 500, 1000
- default-brightness: valid values: 0-100
Each regulator is defined using the standard binding for regulators.
Example:
tps: tps@24 {
reg = <0x24>;
compatible = "ti,tps65217";
backlight {
isel = <1>; /* 1 - ISET1, 2 ISET2 */
fdim = <100>; /* TPS65217_BL_FDIM_100HZ */
default-brightness = <50>;
};
};
linux-7.2.3/Documentation/devicetree/bindings/leds/backlight/zii,rave-sp-backlight.yaml
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/backlight/zii,rave-sp-backlight.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Zodiac Inflight Innovations RAVE Supervisory Processor Backlight
maintainers:
- Frank Li <Frank.Li@nxp.com>
description:
RAVE SP backlight device is a "MFD cell" device corresponding to
backlight functionality of RAVE Supervisory Processor. It is expected
that its Device Tree node is specified as a child of the node
corresponding to the parent RAVE SP device (as documented in
Documentation/devicetree/bindings/mfd/zii,rave-sp.yaml)
properties:
compatible:
const: zii,rave-sp-backlight
required:
- compatible
allOf:
- $ref: common.yaml
unevaluatedProperties: false
examples:
- |
backlight {
compatible = "zii,rave-sp-backlight";
};