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

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Date:   Mon, 12 Dec 2022 12:55:57 +0800
From:   Chuanhong Guo <gch981213@...il.com>
To:     linux-leds@...r.kernel.org
Cc:     Chuanhong Guo <gch981213@...il.com>, Pavel Machek <pavel@....cz>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Stanislav Jakubek <stano.jakubek@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Johan Hovold <johan+linaro@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        Sven Schwermer <sven.schwermer@...ruptive-technologies.com>,
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v4 2/3] dt-bindings: leds: add worldsemi,ws2812b

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

Signed-off-by: Chuanhong Guo <gch981213@...il.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@...il.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