dt-bindings: leds: backlight: Add Awinic AW99706 backlight

Add Awinic AW99706 backlight binding documentation.

Signed-off-by: Junjie Cao <caojunjie650@gmail.com>
Reviewed-by: Daniel Thompson (RISCstar) <danielt@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patch.msgid.link/20251109032240.3422503-2-caojunjie650@gmail.com
Signed-off-by: Lee Jones <lee@kernel.org>

diff --git a/Documentation/devicetree/bindings/leds/backlight/awinic,aw99706.yaml b/Documentation/devicetree/bindings/leds/backlight/awinic,aw99706.yaml
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@@ -0,0 +1,101 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/backlight/awinic,aw99706.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Awinic AW99706 6-channel WLED Backlight Driver
+
+maintainers:
+  - Junjie Cao <caojunjie650@gmail.com>
+
+allOf:
+  - $ref: common.yaml#
+
+properties:
+  compatible:
+    const: awinic,aw99706
+
+  reg:
+    maxItems: 1
+
+  enable-gpios:
+    description: GPIO to use to enable/disable the backlight (HWEN pin).
+    maxItems: 1
+
+  awinic,dim-mode:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: >
+      Select dimming mode of the device.
+        0 = Bypass mode.
+        1 = DC mode.
+        2 = MIX mode(PWM at low brightness and DC at high brightness).
+        3 = MIX-26k mode(MIX mode with different PWM frequency).
+    enum: [ 0, 1, 2, 3 ]
+    default: 1
+
+  awinic,sw-freq-hz:
+    description: Boost switching frequency in Hz.
+    enum: [ 300000, 400000, 500000, 600000, 660000, 750000, 850000, 1000000,
+            1200000, 1330000, 1500000, 1700000 ]
+    default: 750000
+
+  awinic,sw-ilmt-microamp:
+    description: Switching current limitation in uA.
+    enum: [ 1500000, 2000000, 2500000, 3000000 ]
+    default: 3000000
+
+  awinic,iled-max-microamp:
+    description: Maximum LED current setting in uA.
+    minimum: 5000
+    maximum: 50000
+    multipleOf: 500
+    default: 20000
+
+  awinic,uvlo-thres-microvolt:
+    description: UVLO(Under Voltage Lock Out) in uV.
+    enum: [ 2200000, 5000000 ]
+    default: 2200000
+
+  awinic,ramp-ctl:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: >
+      Select ramp control and filter of the device.
+        0 = Fade in/fade out.
+        1 = Light filter.
+        2 = Medium filter.
+        3 = Heavy filter.
+    enum: [ 0, 1, 2, 3 ]
+    default: 2
+
+required:
+  - compatible
+  - reg
+  - enable-gpios
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        backlight@76 {
+            compatible = "awinic,aw99706";
+            reg = <0x76>;
+            enable-gpios = <&tlmm 88 GPIO_ACTIVE_HIGH>;
+            default-brightness = <2047>;
+            max-brightness = <4095>;
+            awinic,dim-mode = <1>;
+            awinic,sw-freq-hz = <750000>;
+            awinic,sw-ilmt-microamp = <3000000>;
+            awinic,uvlo-thres-microvolt = <2200000>;
+            awinic,iled-max-microamp = <20000>;
+            awinic,ramp-ctl = <2>;
+        };
+    };
+
+...