boards: shields: Add Seeed Studio XIAO Expansion Board

Add Seeed Studio XIAO Expansion Board:
- User button
- SSD1306 128x64 pixels
- MicroSD
- PFC8563 RTC

Signed-off-by: Charles Dias <charlesdias.cd@outlook.com>

boards/shields/seeed_xiao_expansion_board/Kconfig.defconfig

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+# Copyright (c) 2024 Charles Dias <charlesdias.cd@outlook.com>
+# SPDX-License-Identifier: Apache-2.0
+
+if SHIELD_SEEED_XIAO_EXPANSION_BOARD
+
+if DISPLAY
+
+if LVGL
+
+config LV_Z_VDB_SIZE
+	default 64
+
+config LV_DPI_DEF
+	default 148
+
+config LV_Z_BITS_PER_PIXEL
+	default 1
+
+choice LV_COLOR_DEPTH
+	default LV_COLOR_DEPTH_1
+endchoice
+
+endif # LVGL
+
+endif # DISPLAY
+
+endif # SHIELD_SEEED_XIAO_EXPANSION_BOARD

boards/shields/seeed_xiao_expansion_board/Kconfig.shield

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+# Copyright (c) 2024 Charles Dias <charlesdias.cd@outlook.com>
+# SPDX-License-Identifier: Apache-2.0
+
+config SHIELD_SEEED_XIAO_EXPANSION_BOARD
+	def_bool $(shields_list_contains,seeed_xiao_expansion_board)

boards/shields/seeed_xiao_expansion_board/doc/index.rst

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+.. _seeed_xiao_expansion_board:
+
+Seeed Studio XIAO Expansion Board
+#################################
+
+Overview
+********
+
+Seeed Studio XIAO Expansion Board is a powerful functional expansion board
+for `Seeed Studio XIAO series`_ of only half Raspberry Pi 4 size. It enables
+building prototypes and projects in an easy and quick way. With its rich
+peripherals, you could explore the infinite possibilities of Seeed Studio
+XIAO series.
+
+.. figure:: img/seeed_xiao_expansion_board.webp
+     :width: 600px
+     :align: center
+     :alt: Seeed Studio XIAO Expansion Board
+
+     Seeed Studio XIAO Expansion Board (Credit: Seeed Studio)
+
+Pin Assignments
+===============
+
++-----------------------+---------------------------------------------+
+| Shield Connector Pin  | Function                                    |
++=======================+=============================================+
+| 0                     | Grove*1 (A0, D0)                            |
++-----------------------+---------------------------------------------+
+| 1                     | User button                                 |
++-----------------------+---------------------------------------------+
+| 2                     | MicroSD SPI CSn                             |
++-----------------------+---------------------------------------------+
+| 3                     | Buzzer(A3)                                  |
++-----------------------+---------------------------------------------+
+| 4                     | Grove*2 I2C SDA                             |
++-----------------------+---------------------------------------------+
+| 5                     | Grove*2 I2C SCL                             |
++-----------------------+---------------------------------------------+
+| 6                     | Grove*1 UART TX                             |
++-----------------------+---------------------------------------------+
+| 7                     | Grove*1 UART RX                             |
++-----------------------+---------------------------------------------+
+| 8                     | MicroSD SPI SCK      (Serial Clock Input)   |
++-----------------------+---------------------------------------------+
+| 9                     | MicroSD SPI MISO     (Serial Data Input)    |
++-----------------------+---------------------------------------------+
+| 10                    | MicroSD SPI MOSI     (Serial Data Output)   |
++-----------------------+---------------------------------------------+
+
+.. figure:: img/pins_xiao_expansion_board.webp
+     :width: 600px
+     :align: center
+     :alt: Seeed Studio XIAO Expansion Board  Pins
+
+     Seeed Studio XIAO Expansion Board Pins (Credit: Seeed Studio)
+
+Programming
+***********
+
+LED Button Sample
+=================
+
+Set ``-DSHIELD=seeed_xiao_expansion_board`` when you invoke ``west build``. For example:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/basic/button
+   :board: xiao_ble/nrf52840
+   :shield: seeed_xiao_expansion_board
+   :goals: build
+
+LVGL Basic Sample
+==========================
+
+Set ``-DSHIELD=seeed_xiao_expansion_board`` when you invoke ``west build``. For example:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/subsys/display/lvgl
+   :board: xiao_ble/nrf52840
+   :shield: seeed_xiao_expansion_board
+   :goals: build
+
+.. _Seeed Studio XIAO series:
+   https://www.seeedstudio.com/XIAO-c-1964.html

boards/shields/seeed_xiao_expansion_board/seeed_xiao_expansion_board.overlay

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+/*
+ * Copyright (c) 2024 Charles Dias <charlesdias.cd@outlook.com>
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	chosen {
+		zephyr,display = &ssd1306_128x64;
+		zephyr,rtc = &pfc8563_rtc;
+	};
+
+	buttons {
+		compatible = "gpio-keys";
+		xiao_button0: button_0 {
+			gpios = <&xiao_d 1 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
+			label = "SW0";
+			zephyr,code = <INPUT_KEY_0>;
+		};
+	};
+
+	aliases {
+		sw0 = &xiao_button0;
+		rtc = &pfc8563_rtc;
+	};
+};
+
+&xiao_i2c {
+	status = "okay";
+
+	ssd1306_128x64: ssd1306@3c {
+		compatible = "solomon,ssd1306fb";
+		reg = <0x3c>;
+		width = <128>;
+		height = <64>;
+		segment-offset = <0>;
+		page-offset = <0>;
+		display-offset = <0>;
+		multiplex-ratio = <63>;
+		segment-remap;
+		com-invdir;
+		prechargep = <0x22>;
+	};
+
+	pfc8563_rtc: pfc8563@51 {
+		compatible = "nxp,pcf8563";
+		reg = <0x51>;
+		status = "okay";
+	};
+};
+
+&xiao_spi {
+	status = "okay";
+	cs-gpios = <&xiao_d 2 GPIO_ACTIVE_LOW>;
+
+	sdhc0: sdhc@0 {
+		compatible = "zephyr,sdhc-spi-slot";
+		reg = <0>;
+		status = "okay";
+		mmc {
+			compatible = "zephyr,sdmmc-disk";
+			status = "okay";
+		};
+		spi-max-frequency = <24000000>;
+	};
+};