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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>;
};
};
};
|
