[PATCH 1/2] dt-bindings: leds: backlight: Add Awinic AW99703 backlight

[Luka Panio <lukapanio@gmail.com>]

The Awinic AW99703 is a 3-string WLED driver converter with an
integrated boost converter and 11-bit brightness control over I2C,
optionally combined with a PWM input.

Signed-off-by: Luka Panio <lukapanio@gmail.com>
---
 .../leds/backlight/awinic,aw99703.yaml        | 131 ++++++++++++++++++
 1 file changed, 131 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/backlight/awinic,aw99703.yaml

diff --git a/Documentation/devicetree/bindings/leds/backlight/awinic,aw99703.yaml b/Documentation/devicetree/bindings/leds/backlight/awinic,aw99703.yaml
new file mode 100644
index 000000000000..62e8cc3118f2
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/backlight/awinic,aw99703.yaml
@@ -0,0 +1,131 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/backlight/awinic,aw99703.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Awinic AW99703 WLED Backlight Driver
+
+maintainers:
+  - Luka Panio <lukapanio@gmail.com>
+
+description:
+  The AW99703 is a 3-string WLED driver with an integrated boost converter
+  and 11-bit I2C (optionally PWM) brightness control.
+
+allOf:
+  - $ref: common.yaml#
+
+properties:
+  compatible:
+    const: awinic,aw99703
+
+  reg:
+    maxItems: 1
+
+  enable-gpios:
+    description: GPIO connected to the HWEN pin.
+    maxItems: 1
+
+  awinic,led-strings:
+    description: Number of enabled LED strings, starting with CH1.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 1
+    maximum: 3
+    default: 3
+
+  awinic,iled-max-microamp:
+    description:
+      Full-scale current of each LED string, reached at the maximum
+      brightness code (and 100% PWM duty cycle if PWM dimming is used).
+    minimum: 4800
+    maximum: 29600
+    multipleOf: 800
+    default: 20000
+
+  awinic,ramp-on-time-us:
+    description: Current sink ramp-up time when leaving standby.
+    enum: [512, 1000, 2000, 4000, 8000, 16000, 32000, 64000, 128000,
+           256000, 512000, 1024000, 2048000, 4096000, 8192000, 16384000]
+    default: 8000
+
+  awinic,ramp-off-time-us:
+    description: Current sink ramp-down time when entering standby.
+    enum: [512, 1000, 2000, 4000, 8000, 16000, 32000, 64000, 128000,
+           256000, 512000, 1024000, 2048000, 4096000, 8192000, 16384000]
+    default: 8000
+
+  awinic,pwm-trans-time-ms:
+    description:
+      Transition time between brightness levels set by the PWM input,
+      for a change over the full duty cycle range.
+    enum: [2, 4, 8, 16, 32, 64, 128, 256]
+    default: 2
+
+  awinic,i2c-trans-time-ms:
+    description:
+      Fixed transition time between brightness levels set over I2C,
+      independent of the size of the change. When absent the brightness
+      ramps with a fixed slope of 1 us per brightness code instead.
+    enum: [128, 192, 256, 320, 384, 448, 512, 576, 640, 768, 1024, 1280,
+           1536, 2560, 4096]
+
+  awinic,ovp-microvolt:
+    description: Boost over-voltage protection threshold.
+    enum: [17500000, 24000000, 31000000, 38000000, 41500000]
+    default: 38000000
+
+  awinic,ocp-microamp:
+    description: Boost over-current protection threshold.
+    enum: [900000, 1800000, 2700000, 3400000]
+    default: 2700000
+
+  awinic,sw-freq-hz:
+    description: Boost switching frequency.
+    enum: [500000, 1000000]
+    default: 1000000
+
+  awinic,inductor-nanohenry:
+    description: Boost inductor value.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [4700, 10000]
+    default: 4700
+
+  awinic,pwm-input:
+    description: Combine the PWM input pin with the I2C brightness.
+    type: boolean
+
+  awinic,exponential-map:
+    description: Use the exponential brightness curve instead of linear.
+    type: boolean
+
+  default-brightness:
+    maximum: 2047
+
+  max-brightness:
+    maximum: 2047
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        backlight@36 {
+            compatible = "awinic,aw99703";
+            reg = <0x36>;
+            enable-gpios = <&gpio 7 GPIO_ACTIVE_HIGH>;
+            awinic,led-strings = <2>;
+            awinic,iled-max-microamp = <20000>;
+            awinic,ocp-microamp = <3400000>;
+            awinic,inductor-nanohenry = <10000>;
+        };
+    };
-- 
2.55.0