[PATCH v10 5/6] dt-bindings: backlight: Add led-backlight binding

[Jean-Jacques Hiblot]

Add DT binding for led-backlight.

Cc: devicetree@xxxxxxxxxxxxxxx
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@xxxxxx>

---

.../leds/backlight/led-backlight.yaml         | 55 +++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/backlight/led-backlight.yaml

diff --git a/Documentation/devicetree/bindings/leds/backlight/led-backlight.yaml b/Documentation/devicetree/bindings/leds/backlight/led-backlight.yaml
new file mode 100644
index 000000000000..47ae3d6b4f31
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/backlight/led-backlight.yaml
@@ -0,0 +1,55 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/backlight/led-backlight.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: LED-based Backlight Device Tree Bindings
+
+maintainers:
+  - Jean-Jacques Hiblot <jjhiblot@xxxxxx>
+
+description: |
+  This binding is used to describe a basic backlight device made of LEDs.
+  It can also be used to describe a backlight device controlled by the
+  output of a LED driver.
+
+properties:
+  compatible:
+    const: led-backlight
+
+  leds:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description: List of LEDs constitutive of the backlight.
+
+  default-brightness:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: Default brightness level on boot.
+    minimum: 0
+
+  brightness-levels:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    description: Array of distinct brightness levels. The levels must be in
+      the range accepted by the underlying LED devices. This is used to
+      translate a backlight brightness level into a LED brightness level. If
+      it is not provided, the identity mapping is used.
+
+required:
+  - compatible
+  - backlight-leds
+
+examples:
+  - |
+    backlight {
+      compatible = "led-backlight";
+      backlight-leds = <&led1>;
+      brightness-levels = <0 4 8 16 32 64 128 255>;
+      default-brightness = <6>; /*6th level => brightness of the LEDs is 128*/
+    };
+  - |
+    backlight {
+      compatible = "led-backlight";
+      backlight-leds = <&led1>, <&led2>;
+      default-brightness = <255>;
+    };
+...
-- 
2.17.1