[PATCH v4 2/3] dt-bindings: leds: add worldsemi,ws2812b

Chuanhong Guo
2022-12-12T04:57:13Z

Add dt binding schema for WorldSemi WS2812B driven using SPI
bus.

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
---
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@gmail.com>
+
+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