dt-bindings: leds: Add Silergy SY7802 flash LED

Document Silergy SY7802 flash LED driver devicetree bindings.
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: André Apitzsch <git@apitzsch.eu>
Link: https://lore.kernel.org/r/20240624-sy7802-v5-1-7abc9d96bfa6@apitzsch.euSigned-off-by: Lee Jones <lee@kernel.org>

Documentation/devicetree/bindings/leds/silergy,sy7802.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/silergy,sy7802.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Silergy SY7802 1800mA Boost Charge Pump LED Driver
+
+maintainers:
+  - André Apitzsch <git@apitzsch.eu>
+
+description: |
+  The SY7802 is a current-regulated charge pump which can regulate two current
+  levels for Flash and Torch modes.
+
+  The SY7802 is a high-current synchronous boost converter with 2-channel
+  high side current sources. Each channel is able to deliver 900mA current.
+
+properties:
+  compatible:
+    enum:
+      - silergy,sy7802
+
+  reg:
+    maxItems: 1
+
+  enable-gpios:
+    maxItems: 1
+    description: A connection to the 'EN' pin.
+
+  flash-gpios:
+    maxItems: 1
+    description: A connection to the 'FLEN' pin.
+
+  vin-supply:
+    description: Regulator providing power to the 'VIN' pin.
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+patternProperties:
+  "^led@[0-1]$":
+    type: object
+    $ref: common.yaml#
+    unevaluatedProperties: false
+
+    properties:
+      reg:
+        description: Index of the LED.
+        minimum: 0
+        maximum: 1
+
+      led-sources:
+        minItems: 1
+        maxItems: 2
+        items:
+          minimum: 0
+          maximum: 1
+
+    required:
+      - reg
+      - led-sources
+
+required:
+  - compatible
+  - reg
+  - "#address-cells"
+  - "#size-cells"
+  - enable-gpios
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/leds/common.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        flash-led-controller@53 {
+            compatible = "silergy,sy7802";
+            reg = <0x53>;
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            enable-gpios = <&tlmm 16 GPIO_ACTIVE_HIGH>;
+
+            led@0 {
+                reg = <0>;
+                function = LED_FUNCTION_FLASH;
+                color = <LED_COLOR_ID_WHITE>;
+                led-sources = <0>, <1>;
+            };
+        };
+    };