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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/adi,ltc3220.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Analog Devices LTC3220 LED Driver
maintainers:
- Edelweise Escala <edelweise.escala@analog.com>
description: >
The LTC3220 is a multi-display LED driver, which contains a high-efficiency,
low-noise charge pump to provide power to up to 18 LED current sources.
The LEDs are individually configurable to 64-step linear brightness control,
blinking and gradation control via 2-wire I2C interface.
For more product information please see the link below
https://www.analog.com/en/products/ltc3220.html
properties:
compatible:
const: adi,ltc3220
reg:
maxItems: 1
'#address-cells':
const: 1
'#size-cells':
const: 0
reset-gpios:
maxItems: 1
patternProperties:
'^led@([1-9a-f]|1[0-2])$':
type: object
$ref: /schemas/leds/common.yaml#
unevaluatedProperties: false
properties:
reg:
description:
Output channel for the LED (1-18 maps to LED outputs D1-D18).
Unit-address must be in hexadecimal (1-12 hex = 1-18 decimal).
For aggregated LED control, define only one LED node with reg = <0x1>
and use led-sources to list all controlled outputs. Only reg 1 should
be present when using led-sources.
items:
- minimum: 1
maximum: 18
required:
- reg
if:
required:
- led-sources
then:
properties:
reg:
items:
- const: 1
required:
- compatible
- reg
- '#address-cells'
- '#size-cells'
additionalProperties: false
examples:
- |
// Independent LEDs
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/leds/common.h>
i2c {
#address-cells = <1>;
#size-cells = <0>;
led-controller@1c {
compatible = "adi,ltc3220";
reg = <0x1c>;
#address-cells = <1>;
#size-cells = <0>;
reset-gpios = <&gpio 17 GPIO_ACTIVE_LOW>;
led@1 {
reg = <0x1>;
function = LED_FUNCTION_INDICATOR;
function-enumerator = <1>;
};
led@2 {
reg = <0x2>;
function = LED_FUNCTION_INDICATOR;
function-enumerator = <2>;
};
led@3 {
reg = <0x3>;
function = LED_FUNCTION_INDICATOR;
function-enumerator = <3>;
};
};
};
- |
// Aggregated LED
#include <dt-bindings/leds/common.h>
i2c {
#address-cells = <1>;
#size-cells = <0>;
led-controller@1c {
compatible = "adi,ltc3220";
reg = <0x1c>;
#address-cells = <1>;
#size-cells = <0>;
led@1 {
reg = <0x1>;
led-sources = <0x1 0x2 0x3 0x4 0x5 0x6 0x7 0x8 0x9 0xa 0xb 0xc 0xd 0xe 0xf 0x10 0x11 0x12>;
function = LED_FUNCTION_BACKLIGHT;
};
};
};
...
|
