boards: shields: add adafruit adalogger featherwing

Add definition for the Adafruit Adalogger Featherwing. This shield
compatible with the Adafruit Feather family is equipped with an SD card
slot and a PCF8524 RTC.

This work is based on the Adafruit Data Logger shield definition.

Signed-off-by: Philip-Dylan Gleonec <philip-dylan@gleonec.bzh>

boards/shields/adafruit_adalogger_featherwing/Kconfig.shield

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+# Copyright (c) 2024 Philip-Dylan Gleonec <philip-dylan@gleonec.bzh>
+# SPDX-License-Identifier: Apache-2.0
+
+config SHIELD_ADAFRUIT_DATA_LOGGER
+	def_bool $(shields_list_contains,adafruit_adalogger_featherwing)

boards/shields/adafruit_adalogger_featherwing/adafruit_adalogger_featherwing.overlay

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+/*
+ * Copyright (c) 2024 Philip-Dylan Gleonec <philip-dylan@gleonec.bzh>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	aliases {
+		rtc = &rtc0_adafruit_adalogger_featherwing;
+		sdhc0 = &sdhc0_adafruit_adalogger_featherwing;
+	};
+};
+
+&feather_spi {
+	status = "okay";
+	cs-gpios = <&feather_header 17 GPIO_ACTIVE_LOW>; /* D10 */
+
+	sdhc0_adafruit_adalogger_featherwing: sdhc@0 {
+		compatible = "zephyr,sdhc-spi-slot";
+		reg = <0>;
+		spi-max-frequency = <12000000>;
+		status = "okay";
+
+		sdmmc {
+			compatible = "zephyr,sdmmc-disk";
+			status = "okay";
+		};
+	};
+};
+
+&feather_i2c {
+	status = "okay";
+
+	rtc0_adafruit_adalogger_featherwing: rtc@68 {
+		compatible = "nxp,pcf8523";
+		reg = <0x68>;
+		alarms-count = <1>;
+		battery-switch-over = "standard";
+		status = "okay";
+	};
+};

boards/shields/adafruit_adalogger_featherwing/doc/index.rst

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+.. _adafruit_adalogger_featherwing_shield:
+
+Adafruit Adalogger Featherwing Shield
+#####################################
+
+Overview
+********
+
+The `Adafruit Adalogger Featherwing Shield`_ features an `NXP PCF8523 Real-Time
+Clock/Calendar with Battery Backup`_, and an SD card interface.
+
+.. figure:: adafruit_adalogger_featherwing.webp
+   :align: center
+   :alt: Adafruit Adalogger Featherwing Shield
+
+   Adafruit Adalogger Featherwing Shield (Credit: Adafruit)
+
+Pin Assignments
+===============
+
++-----------------------+---------------------------------------------+
+| Shield Connector Pin  | Function                                    |
++=======================+=============================================+
+| D10                   | SD card SPI CS                              |
++-----------------------+---------------------------------------------+
+| MOSI                  | SD card SPI MOSI                            |
++-----------------------+---------------------------------------------+
+| MISO                  | SD card SPI MISO                            |
++-----------------------+---------------------------------------------+
+| SCK                   | SD card SPI SCK                             |
++-----------------------+---------------------------------------------+
+| SDA                   | PCF8523 RTC I2C SDA                         |
++-----------------------+---------------------------------------------+
+| SCL                   | PCF8523 RTC I2C SCL                         |
++-----------------------+---------------------------------------------+
+
+Requirements
+************
+
+This shield can only be used with a board which provides a configuration for Feather connectors and
+defines node aliases for SPI, I2C and GPIO interfaces (see :ref:`shields` for more details).
+
+Programming
+***********
+
+Set ``--shield adafruit_adalogger_featherwing`` when you invoke ``west build``. For example:
+
+.. zephyr-app-commands::
+   :zephyr-app: tests/drivers/rtc/rtc_api
+   :board: adafruit_feather_m0_basic_proto
+   :shield: adafruit_adalogger_featherwing
+   :goals: build
+
+.. _Adafruit Adalogger Featherwing Shield:
+   https://learn.adafruit.com/adafruit-adalogger-featherwing
+
+.. _NXP PCF8523 Real-Time Clock/Calendar with Battery Backup:
+   https://www.nxp.com/docs/en/data-sheet/PCF8523.pdf