drivers: counter: Add MCP7940N property to enable VBAT backup (f7280fac) · Commits · Wenxi XU / zephyr

drivers/counter/rtc_mcp7940n.c

+7 −1

Original line number	Diff line number	Diff line
		/*
		* Copyright (c) 2019-2020 Peter Bigot Consulting, LLC
		* Copyright (c) 2021 Laird Connectivity
		* Copyright (c) 2025 Marcin Lyda <elektromarcin@gmail.com>
		*
		* SPDX-License-Identifier: Apache-2.0
		*/
		@@ -50,6 +51,7 @@ struct mcp7940n_config {
		struct counter_config_info generic;
		struct i2c_dt_spec i2c;
		const struct gpio_dt_spec int_gpios;
		bool vbat_enable;
		};

		struct mcp7940n_data {
		@@ -678,6 +680,10 @@ static int mcp7940n_init(const struct device *dev)
		goto out;
		}

		/* Configure VBat enable */
		data->registers.rtc_weekday.vbaten = cfg->vbat_enable;

		/* Set day of week and update VBat enable config */
		rc = set_day_of_week(dev, &unix_time);
		if (rc < 0) {
		goto out;
		@@ -693,7 +699,6 @@ static int mcp7940n_init(const struct device *dev)

		/* Configure alarm interrupt gpio */
		if (cfg->int_gpios.port != NULL) {

		if (!gpio_is_ready_dt(&cfg->int_gpios)) {
		LOG_ERR("Port device %s is not ready",
		cfg->int_gpios.port->name);
		@@ -757,6 +762,7 @@ static DEVICE_API(counter, mcp7940n_api) = {
		}, \
		.i2c = I2C_DT_SPEC_INST_GET(index), \
		.int_gpios = GPIO_DT_SPEC_INST_GET_OR(index, int_gpios, {0}), \
		.vbat_enable = DT_INST_PROP(index, vbat_enable) \
		}; \
		\
		DEVICE_DT_INST_DEFINE(index, mcp7940n_init, NULL, \

+6 −0

Original line number	Diff line number	Diff line
		#
		# Copyright (c) 2021 Laird Connectivity
		# Copyright (c) 2023 Nordic Semiconductor ASA
		# Copyright (c) 2025 Marcin Lyda <elektromarcin@gmail.com>
		#
		# SPDX-License-Identifier: Apache-2.0
		#
		@@ -21,3 +22,8 @@ properties:
		Host input connected to the MCP7940N MFP open drain output pin

		Notifies when an alarm has triggered by asserting this line.

		vbat-enable:
		type: boolean
		description: \|
		Enables external battery backup functionality