# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/backlight/lm3630a-backlight.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: TI LM3630A High-Efficiency Dual-String White LED
maintainers:
- Lee Jones <[email protected]>
- Daniel Thompson <[email protected]>
- Jingoo Han <[email protected]>
description: |
The LM3630A is a current-mode boost converter which supplies the power and
controls the current in up to two strings of 10 LEDs per string.
https://www.ti.com/product/LM3630A
properties:
compatible:
const: ti,lm3630a
reg:
maxItems: 1
'#address-cells':
const: 1
'#size-cells':
const: 0
enable-gpios:
description: GPIO to use to enable/disable the backlight (HWEN pin).
maxItems: 1
required:
- compatible
- reg
- '#address-cells'
- '#size-cells'
patternProperties:
"^led@[01]$":
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;
};
};
};
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