143 lines
3.5 KiB
YAML
143 lines
3.5 KiB
YAML
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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/leds/backlight/lm3630a-backlight.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: TI LM3630A High-Efficiency Dual-String White LED
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maintainers:
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- Lee Jones <lee.jones@linaro.org>
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- Daniel Thompson <daniel.thompson@linaro.org>
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- Jingoo Han <jingoohan1@gmail.com>
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description: |
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The LM3630A is a current-mode boost converter which supplies the power and
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controls the current in up to two strings of 10 LEDs per string.
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https://www.ti.com/product/LM3630A
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properties:
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compatible:
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const: ti,lm3630a
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reg:
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maxItems: 1
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'#address-cells':
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const: 1
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'#size-cells':
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const: 0
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enable-gpios:
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description: GPIO to use to enable/disable the backlight (HWEN pin).
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maxItems: 1
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required:
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- compatible
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- reg
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- '#address-cells'
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- '#size-cells'
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patternProperties:
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"^led@[01]$":
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type: object
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description: |
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Properties for a string of connected LEDs.
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properties:
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reg:
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description: |
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The control bank that is used to program the two current sinks. The
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LM3630A has two control banks (A and B) and are represented as 0 or 1
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in this property. The two current sinks can be controlled
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independently with both banks, or bank A can be configured to control
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both sinks with the led-sources property.
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minimum: 0
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maximum: 1
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label:
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maxItems: 1
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led-sources:
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allOf:
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- minItems: 1
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maxItems: 2
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items:
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minimum: 0
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maximum: 1
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default-brightness:
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description: Default brightness level on boot.
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minimum: 0
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maximum: 255
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max-brightness:
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description: Maximum brightness that is allowed during runtime.
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minimum: 0
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maximum: 255
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ti,linear-mapping-mode:
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description: |
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Enable linear mapping mode. If disabled, then it will use exponential
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mapping mode in which the ramp up/down appears to have a more uniform
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transition to the human eye.
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type: boolean
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required:
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- reg
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additionalProperties: false
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additionalProperties: false
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examples:
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- |
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#include <dt-bindings/gpio/gpio.h>
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i2c {
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#address-cells = <1>;
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#size-cells = <0>;
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led-controller@38 {
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compatible = "ti,lm3630a";
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reg = <0x38>;
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enable-gpios = <&gpio2 5 GPIO_ACTIVE_HIGH>;
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#address-cells = <1>;
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#size-cells = <0>;
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led@0 {
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reg = <0>;
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led-sources = <0 1>;
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label = "lcd-backlight";
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default-brightness = <200>;
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max-brightness = <255>;
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};
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};
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};
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- |
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i2c {
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#address-cells = <1>;
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#size-cells = <0>;
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led-controller@38 {
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compatible = "ti,lm3630a";
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reg = <0x38>;
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#address-cells = <1>;
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#size-cells = <0>;
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led@0 {
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reg = <0>;
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default-brightness = <150>;
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ti,linear-mapping-mode;
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};
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led@1 {
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reg = <1>;
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default-brightness = <225>;
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ti,linear-mapping-mode;
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};
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};
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};
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