Add dt binding schema for WorldSemi WS2812B driven using SPI bus. Signed-off-by: Chuanhong Guo <gch981213@xxxxxxxxx> --- Changes since v1: remove linux driver reference from description remove some obvious descriptions fix unit address regex in multi-led property drop various minItems add maxItems = 1 to reg fix node names and property orders in binding example drop -spi from compatible string add default-brightness Change since v2: drop "this patch" from commit message rename leds to led-controller drop default-brightness and default-intensity Change since v3: reword commit title .../bindings/leds/worldsemi,ws2812b.yaml | 116 ++++++++++++++++++ 1 file changed, 116 insertions(+) create mode 100644 Documentation/devicetree/bindings/leds/worldsemi,ws2812b.yaml diff --git a/Documentation/devicetree/bindings/leds/worldsemi,ws2812b.yaml b/Documentation/devicetree/bindings/leds/worldsemi,ws2812b.yaml new file mode 100644 index 000000000000..548c05ac3d31 --- /dev/null +++ b/Documentation/devicetree/bindings/leds/worldsemi,ws2812b.yaml @@ -0,0 +1,116 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/leds/worldsemi,ws2812b.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: WS2812B LEDs driven using SPI + +maintainers: + - Chuanhong Guo <gch981213@xxxxxxxxx> + +description: | + WorldSemi WS2812B is a individually addressable LED chip that can be chained + together and controlled individually using a single wire. + This binding describes a chain of WS2812B LEDs connected to the SPI MOSI pin. + Typical setups includes connecting the data pin of the LED chain to MOSI as + the only device or using CS and MOSI with a tri-state voltage-level shifter + for the data pin. + The SPI frequency needs to be 2.105MHz~2.85MHz for the timing to be correct + and the controller needs to send all the bytes continuously. + +allOf: + - $ref: /schemas/spi/spi-peripheral-props.yaml# + +properties: + compatible: + const: worldsemi,ws2812b + + reg: + maxItems: 1 + + spi-max-frequency: + minimum: 2105000 + maximum: 2850000 + + "#address-cells": + const: 1 + + "#size-cells": + const: 0 + +patternProperties: + "^multi-led@[0-9a-f]+$": + type: object + $ref: leds-class-multicolor.yaml# + unevaluatedProperties: false + + properties: + color-index: + description: | + A 3-item array specifying color of each components in this LED. It + should be one of the LED_COLOR_ID_* prefixed definitions from the + header include/dt-bindings/leds/common.h. Defaults to + <LED_COLOR_ID_GREEN LED_COLOR_ID_RED LED_COLOR_ID_BLUE> + if unspecified. + $ref: /schemas/types.yaml#/definitions/uint32-array + maxItems: 3 + + reg: + description: | + Which LED this node represents. The reg of the first LED on the chain + is 0. + maxItems: 1 + + required: + - reg + - color + - function + +required: + - compatible + +additionalProperties: false + +examples: + - | + #include <dt-bindings/leds/common.h> + spi { + #address-cells = <1>; + #size-cells = <0>; + + led-controller@0 { + compatible = "worldsemi,ws2812b"; + reg = <0>; + #address-cells = <1>; + #size-cells = <0>; + spi-max-frequency = <2850000>; + multi-led@0 { + reg = <0>; + color-index = <LED_COLOR_ID_RED LED_COLOR_ID_GREEN LED_COLOR_ID_BLUE>; + color = <LED_COLOR_ID_RGB>; + function = LED_FUNCTION_STATUS; + function-enumerator = <0>; + }; + multi-led@1 { + reg = <1>; + color = <LED_COLOR_ID_RGB>; + function = LED_FUNCTION_STATUS; + function-enumerator = <1>; + }; + multi-led@2 { + reg = <2>; + color = <LED_COLOR_ID_RGB>; + function = LED_FUNCTION_STATUS; + function-enumerator = <2>; + }; + multi-led@3 { + reg = <3>; + color = <LED_COLOR_ID_RGB>; + function = LED_FUNCTION_STATUS; + function-enumerator = <3>; + }; + }; + }; + +... -- 2.38.1
