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drivers: counter: Add MCP7940N property to enable VBAT backup #84536

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drivers: counter: Add MCP7940N property to enable VBAT backup #84536

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8 changes: 7 additions & 1 deletion drivers/counter/rtc_mcp7940n.c
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
/*
* Copyright (c) 2019-2020 Peter Bigot Consulting, LLC
* Copyright (c) 2021 Laird Connectivity
* Copyright (c) 2025 Marcin Lyda <[email protected]>
*
* SPDX-License-Identifier: Apache-2.0
*/
Expand Down Expand Up @@ -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 {
Expand Down Expand Up @@ -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;
Expand All @@ -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);
Expand Down Expand Up @@ -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, \
Expand Down
6 changes: 6 additions & 0 deletions dts/bindings/rtc/microchip,mcp7940n.yaml
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
#
# Copyright (c) 2021 Laird Connectivity
# Copyright (c) 2023 Nordic Semiconductor ASA
# Copyright (c) 2025 Marcin Lyda <[email protected]>
#
# SPDX-License-Identifier: Apache-2.0
#
Expand All @@ -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
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