samples: cp9314: Adds a basic sample app for CP9314

Adds a sample app demonstrating CP9314 operation

Signed-off-by: Ricardo Rivera-Matos <rriveram@opensource.cirrus.com>

samples/drivers/regulator_cp9314/CMakeLists.txt

@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20.0)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(cp9314)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

samples/drivers/regulator_cp9314/boards/nucleo_f401re.overlay

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2023 Cirrus Logic, Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+ #include <zephyr/dt-bindings/gpio/gpio.h>
+ #include <zephyr/dt-bindings/i2c/i2c.h>
+ #include <zephyr/dt-bindings/regulator/cp9314.h>
+
+&arduino_i2c {
+    status = "okay";
+    clock-frequency = <I2C_BITRATE_STANDARD>;
+
+    cp9314: cp9314@72 {
+        compatible = "cirrus,cp9314";
+        reg = <0x72>;
+        status = "okay";
+
+        regulator-initial-mode = <CP9314_MODE_2TO1>;
+        regulator-allowed-modes = <CP9314_MODE_2TO1 CP9314_MODE_3TO1>;
+
+        cirrus,en-gpios = <&arduino_header 8 GPIO_ACTIVE_HIGH>;
+        cirrus,sync-role = "host";
+    };
+
+    cp9314_dev2: cp9314@73 {
+        compatible = "cirrus,cp9314";
+        reg = <0x73>;
+        status = "okay";
+
+        regulator-initial-mode = <CP9314_MODE_2TO1>;
+        regulator-allowed-modes = <CP9314_MODE_2TO1 CP9314_MODE_3TO1>;
+
+        cirrus,en-gpios = <&arduino_header 8 GPIO_ACTIVE_HIGH>;
+        cirrus,sync-role = "device-2";
+    };
+};

samples/drivers/regulator_cp9314/prj.conf

@@ -0,0 +1,5 @@
+CONFIG_I2C=y
+CONFIG_LOG=y
+CONFIG_REGULATOR=y
+CONFIG_REGULATOR_CP9314=y
+CONFIG_CBPRINTF_FP_SUPPORT=y

samples/drivers/regulator_cp9314/src/main.c

@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2023 Cirrus Logic, Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "zephyr/sys/printk.h"
+#include <zephyr/kernel.h>
+#include <zephyr/device.h>
+#include <zephyr/devicetree.h>
+#include <zephyr/drivers/regulator.h>
+
+int main(void)
+{
+	const struct device *dev2 = DEVICE_DT_GET_OR_NULL(DT_NODELABEL(cp9314_dev2));
+	const struct device *host = DEVICE_DT_GET(DT_NODELABEL(cp9314));
+	uint8_t mode;
+	int ret;
+
+	if (host == NULL) {
+		printk("No host CP9314 found...\n");
+		return -EIO;
+	} else if (dev2 == NULL) {
+		printk("No secondary CP9314 found, assuming standalone operation\n");
+	}
+
+	if (!device_is_ready(host)) {
+		printk("\nError: Device \"%s\" is not ready; "
+		       "check the driver initialization logs for errors.\n",
+		       host->name);
+		return -EIO;
+	}
+
+	printk("Found device \"%s\", getting regulator data\n", host->name);
+
+	ret = regulator_get_mode(host, &mode);
+	if (ret < 0) {
+		printk("Failed to get \"%s\" regulator mode:%d\n", host->name, ret);
+		return -EIO;
+	}
+
+	printk("\"%s\" op mode is:%d\n", host->name, mode);
+
+	if (dev2) {
+		if (!device_is_ready(dev2)) {
+			printk("\nError: Device \"%s\" is not ready; "
+			       "check the driver initialization logs for errors.\n",
+			       dev2->name);
+			return -EIO;
+		}
+
+		printk("Found device \"%s\", getting regulator data\n", dev2->name);
+
+		ret = regulator_get_mode(dev2, &mode);
+		if (ret < 0) {
+			printk("Failed to get \"%s\" regulator mode:%d\n", dev2->name, ret);
+			return -EIO;
+		}
+
+		printk("\"%s\" op mode is:%d\n", dev2->name, mode);
+	}
+
+	while (1) {
+		printk("Found device %s\n", host->name);
+		if (dev2) {
+			printk("Found device %s\n", dev2->name);
+		}
+
+		ret = regulator_enable(host);
+		if (ret < 0) {
+			printk("Error enabling regulator: %d\n", ret);
+			return ret;
+		}
+
+		if (dev2) {
+			ret = regulator_enable(dev2);
+			if (ret < 0) {
+				printk("Error enabling regulator: %d\n", ret);
+				return ret;
+			}
+		}
+
+		printk("Converter(s) enabled\n");
+
+		k_sleep(K_SECONDS(10));
+
+		if (dev2) {
+			ret = regulator_disable(dev2);
+			if (ret < 0) {
+				printk("Error disabling regulator: %d\n", ret);
+				return ret;
+			}
+		}
+
+		ret = regulator_disable(host);
+		if (ret < 0) {
+			printk("Error disabling regulator: %d\n", ret);
+			return ret;
+		}
+
+		printk("Converter(s) disabled\n");
+
+		k_sleep(K_SECONDS(10));
+	}
+
+	return 0;
+}