boards: shields: Add support for Adafruit AW9523 board

Add support for Adafruit AW9523 GPIO Expander/LED Controller

Co-authored-by: Benjamin Cabé <kartben@gmail.com>
Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>

boards/shields/adafruit_aw9523/Kconfig.shield

@@ -0,0 +1,5 @@
+# Copyright (c) 2024 TOKITA Hiroshi
+# SPDX-License-Identifier: Apache-2.0
+
+config SHIELD_ADAFRUIT_AW9523
+	def_bool $(shields_list_contains,adafruit_aw9523)

boards/shields/adafruit_aw9523/adafruit_aw9523.overlay

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+/*
+ * Copyright (c) 2024 TOKITA Hiroshi
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&stemma_qt_i2c {
+	status = "okay";
+
+	adafruit_aw9523: aw9523b@58 {
+		status = "okay";
+		reg = <0x58>;
+		compatible = "awinic,aw9523b";
+
+		adafruit_aw9523_gpio: aw9523b-gpio {
+			status = "okay";
+			compatible = "awinic,aw9523b-gpio";
+			gpio-controller;
+			#gpio-cells = <2>;
+		};
+	};
+};

boards/shields/adafruit_aw9523/doc/index.rst

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+.. _adafruit_aw9523:
+
+Adafruit AW9523 GPIO Expander and LED Driver
+############################################
+
+Overview
+********
+
+The `Adafruit AW9523 GPIO Expander and LED Driver`_ provides
+16-channel GPIO/LED controller function.
+
+.. figure:: adafruit_aw9523.webp
+   :align: center
+   :alt: Adafruit AW9523
+
+   Adafruit AW9523 (Credit: Adafruit)
+
+Pin Assignments
+===============
+
++--------------------------+------------------------------------------+
+| Shield Pin               | Function                                 |
++==========================+==========================================+
+| SDA                      | AW9523B I2C SDA                          |
++--------------------------+------------------------------------------+
+| SCL                      | AW9523B I2C SCL                          |
++--------------------------+------------------------------------------+
+| INT (Pad on board)       | AW9523B Interrupt output [1]_            |
++--------------------------+------------------------------------------+
+| RST (Pad on board)       | AW9523B Reset pin [2]_                   |
++--------------------------+------------------------------------------+
+
+.. [1] To receive interrupts, connect the INT pin to the SoC's GPIO and set the connected
+       GPIO in the ``int-gpios`` property in an additional overlay. The INT terminal must be
+       pulled up.
+
+.. [2] If you want to control the reset pin from the SoC, connect it to a GPIO on the SoC
+       and define the ``reset-gpios`` property in an additional overlay.
+
+Programming
+***********
+
+Set ``--shield adafruit_aw9523`` when you invoke ``west build``.
+
+.. _Adafruit AW9523 GPIO Expander and LED Driver:
+    https://learn.adafruit.com/adafruit-aw9523-gpio-expander-and-led-driver
+
+.. _Awinic AW9523B 16 MULTI-FUNCTION LED DRIVER AND GPIO CONTROLLER WITH I2C INTERFACE:
+    https://doc.awinic.com/doc/202403/deffbf3b-7e7b-4ff6-8e91-fd85e2d845d5.pdf

dts/bindings/mfd/awinic,aw9523b.yaml

@@ -1,7 +1,7 @@
 # Copyright (c) 2024 TOKITA Hiroshi
 # SPDX-License-Identifier: Apache-2.0
 
-description: Awinic AW9523B
+description: Awinic AW9523B 16 multi-function LED driver and GPIO controller
 
 compatible: "awinic,aw9523b"