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Diffstat (limited to 'Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml')
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diff --git a/Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml b/Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml new file mode 100644 index 000000000..3c9b4054e --- /dev/null +++ b/Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml @@ -0,0 +1,142 @@ +# 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 <lee@kernel.org> + - Daniel Thompson <daniel.thompson@linaro.org> + - Jingoo Han <jingoohan1@gmail.com> + +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; + }; + }; + }; |