dt-bindings: leds: LTC3208: Document LTC3208 Multidisplay LED Driver

Add Documentation for LTC3208 Multidisplay LED Driver.

Signed-off-by: Jan Carlo Roleda <jancarlo.roleda@analog.com>

Author: jcroleda

Documentation/devicetree/bindings/leds/leds-ltc3208.yaml

@@ -0,0 +1,182 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (c) 2025 Analog Devices, Inc.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/leds-ltc3208.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: LTC3208 Multidisplay LED Controller from Linear Technologies (Now Analog Devices).
+
+maintainers:
+  - Jan Carlo Roleda <jancarlo.roleda@analog.com>
+
+description:
+  The LTC3208 is a multidisplay LED controller that can support up to 1A to all
+  connected LEDs.
+
+  The datasheet for this device can be found in
+  https://www.analog.com/en/products/ltc3208.html
+
+
+properties:
+  compatible:
+    const: adi,ltc3208
+
+  reg:
+    maxItems: 1
+
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
+  enrgbs-gpios:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description:
+      GPIO pin to control the ENRGBS (Enable RGB/SUB) pin of the device.
+      When driven high, it enables the RGB channel. When driven low, it enables
+      the SUB channel (if adi,cfg-enrgbs-pin is set).
+
+  camhl-gpios:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description:
+      GPIO pin to control the CAMHL (Camera High/Low) pin of the device.
+      Controls which camera output register (high or low byte) is active.
+
+  adi,disable-camhl-pin:
+    type: boolean
+    description: Configures whether the external CAMHL pin is disabled.
+      if disabled then the output pins associated with CAM will always select
+      the CAM register's high half-byte brightness.
+
+  adi,cfg-enrgbs-pin:
+    type: boolean
+    description:
+      Configures which channel the ENRGBS pin toggles when it receives a signal.
+      ENRGBS pin controls the SUB channel's output pins if this is set,
+      or RGB channel's output pins if this is unset.
+
+  adi,force-cpo-level:
+    $ref: /schemas/types.yaml#/definitions/string
+    description: Forces the Charge Pump Output to a specified multiplier
+    enum:
+      - "1" # none; device CPO multiplier acts on dropout signals
+      - "1.5"
+      - "2"
+    default:
+      - "1"
+
+  adi,disable-rgb-aux4-dropout:
+    type: boolean
+    description: Configures the RGB and AUX4 dropout signals to be disabled.
+
+  adi,aux1-channel:
+    $ref: /schemas/types.yaml#/definitions/string
+    description:
+      LED Channel that the AUX1 output pin mirrors its brightness level from.
+    enum: [aux, main, sub, cam]
+    default: aux
+
+  adi,aux2-channel:
+    $ref: /schemas/types.yaml#/definitions/string
+    description:
+      LED Channel that the AUX2 output pin mirrors its brightness level from.
+    enum: [aux, main, sub, cam]
+    default: aux
+
+  adi,aux3-channel:
+    $ref: /schemas/types.yaml#/definitions/string
+    description:
+      LED Channel that the AUX3 output pin mirrors its brightness level from.
+    enum: [aux, main, sub, cam]
+    default: aux
+
+  adi,aux4-channel:
+    $ref: /schemas/types.yaml#/definitions/string
+    description:
+      LED Channel that the AUX4 output pin mirrors its brightness level from.
+    enum: [aux, main, sub, cam]
+    default: aux
+
+patternProperties:
+  "^led@[0-7]$":
+    type: object
+    unevaluatedProperties: false
+    properties:
+      reg:
+        description:
+          LED Channel Number. each channel maps to a specific channel group used
+          to configure the brightness level of the output pins corresponding to
+          the channel.
+        enum:
+          - 0 # Main Channel (8-bit brightness)
+          - 1 # Sub Channel (8-bit brightness)
+          - 2 # AUX Channel (4-bit brightness)
+          - 3 # Camera Channel, Low-side byte (4-bit brightness)
+          - 4 # Camera Channel, High-side byte (4-bit brightness)
+          - 5 # Red Channel (4-bit brightness)
+          - 6 # Blue Channel (4-bit brightness)
+          - 7 # Green Channel (4-bit brightness)
+    required:
+      - reg
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      led-controller@1b {
+        compatible = "adi,ltc3208";
+        reg = <0x1b>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+        adi,force-cpo-level = "1";
+        adi,disable-camhl-pin;
+        adi,cfg-enrgbs-pin;
+        adi,disable-rgb-aux4-dropout;
+
+        enrgbs-gpios = <&gpio 12 GPIO_ACTIVE_HIGH>;
+        camhl-gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+
+        led@0 {
+          reg = <0>;
+        };
+
+        led@1 {
+          reg = <1>;
+        };
+
+        led@2 {
+          reg = <2>;
+        };
+
+        led@3 {
+          reg = <3>;
+        };
+
+        led@4 {
+          reg = <4>;
+        };
+
+        led@5 {
+          reg = <5>;
+        };
+
+        led@6 {
+          reg = <6>;
+        };
+
+        led@7 {
+          reg = <7>;
+        };
+      };
+    };