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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/ti,lm3697.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: TI LM3697 Highly Efficient White LED Driver
maintainers:
- Dan Murphy <dmurphy@ti.com>
description: >
The LM3697 11-bit LED driver provides high-performance backlight dimming for
1, 2, or 3 series LED strings while delivering up to 90% efficiency.
This device is suitable for display and keypad lighting.
properties:
compatible:
const: ti,lm3697
reg:
maxItems: 1
'#address-cells':
const: 1
'#size-cells':
const: 0
enable-gpios:
description: GPIO pin to enable or disable the device.
maxItems: 1
vled-supply:
description: LED supply for the device.
patternProperties:
'^led@[01]$':
description: LED control bank nodes.
$ref: common.yaml#
unevaluatedProperties: false
properties:
reg:
description: Control bank selection (0 = bank A, 1 = bank B).
maximum: 1
led-sources:
description: >
HVLED strings associated with this control bank:
0 - HVLED1
1 - HVLED2
2 - HVLED3
minItems: 1
maxItems: 3
items:
maximum: 2
ti,brightness-resolution:
description: Brightness resolution for the LED string.
$ref: /schemas/types.yaml#/definitions/uint32
maximum: 2047
ramp-up-us:
description: Ramp-up time in microseconds.
minimum: 117
maximum: 2048
ramp-down-us:
description: Ramp-down time in microseconds.
minimum: 117
maximum: 2048
required:
- reg
- led-sources
required:
- compatible
- reg
- '#address-cells'
- '#size-cells'
additionalProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
i2c {
#address-cells = <1>;
#size-cells = <0>;
led-controller@36 {
compatible = "ti,lm3697";
#address-cells = <1>;
#size-cells = <0>;
reg = <0x36>;
enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
vled-supply = <&vbatt>;
led@0 {
reg = <0>;
led-sources = <0 2>;
ti,brightness-resolution = <2047>;
ramp-up-us = <500>;
ramp-down-us = <1000>;
label = "white:first_backlight_cluster";
linux,default-trigger = "backlight";
};
led@1 {
reg = <1>;
led-sources = <1>;
ti,brightness-resolution = <255>;
ramp-up-us = <500>;
ramp-down-us = <1000>;
label = "white:second_backlight_cluster";
linux,default-trigger = "backlight";
};
};
};
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