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drivers: watchdog: npm6001: initial version
Driver for the watchdog embedded in the nPM6001 PMIC. Signed-off-by: Gerard Marull-Paretas <[email protected]>
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‎drivers/watchdog/CMakeLists.txt

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@@ -19,6 +19,7 @@ zephyr_library_sources_ifdef(CONFIG_WDT_MCUX_WDOG wdt_mcux_wdog.c)
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zephyr_library_sources_ifdef(CONFIG_WDT_MCUX_WDOG32 wdt_mcux_wdog32.c)
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zephyr_library_sources_ifdef(CONFIG_WDT_MCUX_WWDT wdt_mcux_wwdt.c)
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zephyr_library_sources_ifdef(CONFIG_WDT_NPCX wdt_npcx.c)
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zephyr_library_sources_ifdef(CONFIG_WDT_NPM6001 wdt_npm6001.c)
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zephyr_library_sources_ifdef(CONFIG_WDT_NRFX wdt_nrfx.c)
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zephyr_library_sources_ifdef(CONFIG_WDT_RPI_PICO wdt_rpi_pico.c)
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zephyr_library_sources_ifdef(CONFIG_WDT_SAM wdt_sam.c)

‎drivers/watchdog/Kconfig

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@@ -88,4 +88,6 @@ source "drivers/watchdog/Kconfig.rpi_pico"
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source "drivers/watchdog/Kconfig.gd32"
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source "drivers/watchdog/Kconfig.npm6001"
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endif

‎drivers/watchdog/Kconfig.npm6001

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# Copyright (c) 2022 Nordic Semiconductor ASA
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# SPDX-License-Identifier: Apache-2.0
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config WDT_NPM6001
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bool "nPM6001 Watchdog driver"
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default y
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depends on DT_HAS_NORDIC_NPM6001_WDT_ENABLED
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select I2C
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help
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Enable nPM6001 Watchdog driver
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config WDT_NPM6001_INIT_PRIORITY
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int "nPM6001 Watchdog driver initialization priority"
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depends on WDT_NPM6001
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default 60
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help
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Initialization priority for the nPM6001 Watchdog driver. It must be
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greater than the I2C controller init priority.

‎drivers/watchdog/wdt_npm6001.c

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/*
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* Copyright (c) 2022 Nordic Semiconductor ASA
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT nordic_npm6001_wdt
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#include <errno.h>
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#include <zephyr/device.h>
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#include <zephyr/drivers/i2c.h>
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#include <zephyr/drivers/watchdog.h>
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#include <zephyr/sys/util_macro.h>
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#include <zephyr/toolchain.h>
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/* nPM6001 Watchdog related registers */
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#define NPM6001_WDARMEDVALUE 0x54U
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#define NPM6001_WDARMEDSTROBE 0x55U
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#define NPM6001_WDTRIGGERVALUE0 0x56U
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#define NPM6001_WDTRIGGERVALUE1 0x57U
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#define NPM6001_WDTRIGGERVALUE2 0x58U
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#define NPM6001_WDDATASTROBE 0x5DU
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#define NPM6001_WDPWRUPVALUE 0x5EU
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#define NPM6001_WDPWRUPSTROBE 0x5FU
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#define NPM6001_WDKICK 0x60U
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#define NPM6001_WDREQPOWERDOWN 0x62U
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/* nPM6001 WDTRIGGERVALUEx ms/LSB, min/max values */
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#define NPM6001_WDTRIGGERVALUE_MS_LSB 4000U
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#define NPM6001_WDTRIGGERVALUE_MIN 0x2U
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#define NPM6001_WDTRIGGERVALUE_MAX 0xFFFFFFU
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/* nPM6001 WDPWRUPVALUE fields */
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#define NPM6001_WDPWRUPVALUE_OSC_ENABLE BIT(0)
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#define NPM6001_WDPWRUPVALUE_COUNTER_ENABLE BIT(1)
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#define NPM6001_WDPWRUPVALUE_LS_ENABLE BIT(2)
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struct wdt_npm6001_config {
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struct i2c_dt_spec bus;
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};
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static int wdt_npm6001_setup(const struct device *dev, uint8_t options)
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{
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ARG_UNUSED(dev);
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ARG_UNUSED(options);
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return 0;
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}
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static int wdt_npm6001_disable(const struct device *dev)
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{
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const struct wdt_npm6001_config *config = dev->config;
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uint8_t buf[4] = {NPM6001_WDARMEDVALUE, 1U, NPM6001_WDARMEDSTROBE, 1U};
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return i2c_write_dt(&config->bus, buf, sizeof(buf));
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}
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static int wdt_npm6001_install_timeout(const struct device *dev,
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const struct wdt_timeout_cfg *timeout)
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{
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const struct wdt_npm6001_config *config = dev->config;
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uint32_t window;
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uint8_t buf[2];
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int ret;
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if (timeout->window.min != 0U) {
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return -EINVAL;
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}
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/* round-up timeout, e.g. 5s -> 8s */
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window = (((timeout->window.max + NPM6001_WDTRIGGERVALUE_MS_LSB - 1U) /
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NPM6001_WDTRIGGERVALUE_MS_LSB) +
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1U);
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if ((window < NPM6001_WDTRIGGERVALUE_MIN) ||
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(window > NPM6001_WDTRIGGERVALUE_MAX)) {
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return -EINVAL;
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}
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/* enable OSC/COUNTER/LS */
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buf[0] = NPM6001_WDPWRUPVALUE;
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buf[1] = NPM6001_WDPWRUPVALUE_OSC_ENABLE |
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NPM6001_WDPWRUPVALUE_COUNTER_ENABLE |
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NPM6001_WDPWRUPVALUE_LS_ENABLE;
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ret = i2c_write_dt(&config->bus, buf, sizeof(buf));
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if (ret < 0) {
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return ret;
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}
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buf[0] = NPM6001_WDPWRUPSTROBE;
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buf[1] = 1U;
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ret = i2c_write_dt(&config->bus, buf, sizeof(buf));
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if (ret < 0) {
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return ret;
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}
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/* write trigger value */
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buf[0] = NPM6001_WDTRIGGERVALUE0;
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buf[1] = (uint8_t)window;
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ret = i2c_write_dt(&config->bus, buf, sizeof(buf));
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if (ret < 0) {
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return ret;
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}
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buf[0] = NPM6001_WDTRIGGERVALUE1;
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buf[1] = (uint8_t)(window >> 8U);
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ret = i2c_write_dt(&config->bus, buf, sizeof(buf));
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if (ret < 0) {
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return ret;
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}
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buf[0] = NPM6001_WDTRIGGERVALUE2;
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buf[1] = (uint8_t)(window >> 16U);
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ret = i2c_write_dt(&config->bus, buf, sizeof(buf));
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if (ret < 0) {
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return ret;
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}
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buf[0] = NPM6001_WDDATASTROBE;
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buf[1] = 1U;
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ret = i2c_write_dt(&config->bus, buf, sizeof(buf));
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if (ret < 0) {
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return ret;
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}
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/* arm watchdog & kick */
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buf[0] = NPM6001_WDARMEDVALUE;
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buf[1] = 1U;
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ret = i2c_write_dt(&config->bus, buf, sizeof(buf));
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if (ret < 0) {
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return ret;
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}
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buf[0] = NPM6001_WDARMEDSTROBE;
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buf[1] = 1U;
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ret = i2c_write_dt(&config->bus, buf, sizeof(buf));
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if (ret < 0) {
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return ret;
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}
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buf[0] = NPM6001_WDKICK;
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buf[1] = 1U;
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ret = i2c_write_dt(&config->bus, buf, sizeof(buf));
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if (ret < 0) {
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return ret;
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}
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return 0;
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}
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static int wdt_npm6001_feed(const struct device *dev, int channel_id)
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{
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const struct wdt_npm6001_config *config = dev->config;
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uint8_t buf[2] = {NPM6001_WDKICK, 1U};
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ARG_UNUSED(channel_id);
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return i2c_write_dt(&config->bus, buf, sizeof(buf));
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}
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static const struct wdt_driver_api wdt_npm6001_api = {
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.setup = wdt_npm6001_setup,
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.disable = wdt_npm6001_disable,
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.install_timeout = wdt_npm6001_install_timeout,
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.feed = wdt_npm6001_feed,
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};
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static int wdt_npm6001_init(const struct device *dev)
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{
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const struct wdt_npm6001_config *config = dev->config;
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if (!device_is_ready(config->bus.bus)) {
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return -ENODEV;
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}
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return 0;
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}
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#define WDT_NPM6001_DEFINE(n) \
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static const struct wdt_npm6001_config wdt_npm6001_config##n = { \
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.bus = I2C_DT_SPEC_GET(DT_INST_PARENT(n)), \
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}; \
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\
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DEVICE_DT_INST_DEFINE(n, &wdt_npm6001_init, NULL, NULL, \
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&wdt_npm6001_config##n, POST_KERNEL, \
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CONFIG_WDT_NPM6001_INIT_PRIORITY, \
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&wdt_npm6001_api);
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DT_INST_FOREACH_STATUS_OKAY(WDT_NPM6001_DEFINE)

‎dts/bindings/watchdog/nordic,npm6001-wdt.yaml

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# Copyright (c) 2022 Nordic Semiconductor ASA
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# SPDX-License-Identifier: Apache-2.0
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description: nPM6001 Watchdog
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compatible: "nordic,npm6001-wdt"

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