boards: shields: npm2100_ek shield

Add an nPM2100 EK shield

Signed-off-by: Sergei Ovchinnikov <sergei.ovchinnikov@nordicsemi.no>

Author: seov-nordic

boards/shields/npm2100_ek/Kconfig.shield

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+# Copyright (c) 2025 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+config SHIELD_NPM2100_EK
+	def_bool $(shields_list_contains,npm2100_ek)

boards/shields/npm2100_ek/doc/index.rst

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+.. _npm2100_ek:
+
+nPM2100 EK
+##########
+
+Overview
+********
+
+The nPM2100 EK lets you test different functions and features of the nPM2100
+Power Management Integrated Circuit (PMIC).
+
+Requirements
+************
+
+The nPM2100 EK board is not a direct fit into an Arduino connector. However,
+the Zephyr shield must be connected to the Arduino shield connectors. That is,
+you need to connect the I2C lines to the ``arduino_i2c`` bus. This allows to
+use the shield with any host board that supports the Arduino connector.
+
+Usage
+*****
+
+To use the shield in any application, build it with the following command:
+
+.. zephyr-app-commands::
+   :board: your_board
+   :shield: npm2100_ek
+   :goals: build
+
+For a comprehensive sample, refer to :zephyr:code-sample:`npm2100_ek`.

boards/shields/npm2100_ek/npm2100_ek.overlay

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+/*
+ * Copyright (C) 2025 Nordic Semiconductor ASA
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <dt-bindings/regulator/npm2100.h>
+#include <zephyr/dt-bindings/input/input-event-codes.h>
+
+&arduino_i2c {
+	npm2100_pmic: pmic@74 {
+		compatible = "nordic,npm2100";
+		reg = <0x74>;
+
+		npm2100_gpio: gpio-controller {
+			compatible = "nordic,npm2100-gpio";
+			gpio-controller;
+			#gpio-cells = <2>;
+			ngpios = <2>;
+		};
+
+		npm2100_regulators: regulators {
+			compatible = "nordic,npm2100-regulator";
+
+			/* limits are set to min/max allowed values */
+			npm2100_boost: BOOST {
+				regulator-min-microvolt = <1800000>;
+				regulator-max-microvolt = <3300000>;
+			};
+
+			npm2100_ldosw: LDOSW {
+				regulator-min-microvolt = <800000>;
+				regulator-max-microvolt = <3000000>;
+			};
+		};
+
+		npm2100_wdt: watchdog {
+			compatible = "nordic,npm2100-wdt";
+		};
+
+		npm2100_vbat: vbat {
+			compatible = "nordic,npm2100-vbat";
+		};
+
+		npm2100_buttons: buttons {
+			compatible = "gpio-keys";
+			pmic_button0: pmic_button_0 {
+				gpios = < &npm2100_gpio 0 GPIO_ACTIVE_LOW>;
+				label = "Pmic button switch 0";
+				zephyr,code = <INPUT_KEY_0>;
+			};
+			pmic_button1: pmic_button_1 {
+				gpios = < &npm2100_gpio 1 GPIO_ACTIVE_LOW>;
+				label = "Pmic button switch 1";
+				zephyr,code = <INPUT_KEY_1>;
+			};
+		};
+	};
+};