drivers/i2c/i2c_mcux_lpi2c.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /*
  * Copyright (c) 2016 Freescale Semiconductor, Inc.
  * Copyright 2019-2023, NXP
  * Copyright (c) 2022 Vestas Wind Systems A/S
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #define DT_DRV_COMPAT nxp_imx_lpi2c

 #include <errno.h>
 #include <zephyr/drivers/i2c.h>
 #include <zephyr/drivers/clock_control.h>
 #include <zephyr/kernel.h>
 #include <zephyr/irq.h>
 #include <fsl_lpi2c.h>

 #include <zephyr/drivers/pinctrl.h>

 #ifdef CONFIG_I2C_MCUX_LPI2C_BUS_RECOVERY
 #include "i2c_bitbang.h"
 #include <zephyr/drivers/gpio.h>
 #endif /* CONFIG_I2C_MCUX_LPI2C_BUS_RECOVERY */

 #include <zephyr/logging/log.h>
 LOG_MODULE_REGISTER(mcux_lpi2c);


 #include "i2c-priv.h"
 /* Wait for the duration of 12 bits to detect a NAK after a bus
  * address scan.  (10 appears sufficient, 20% safety factor.)
  */
 #define SCAN_DELAY_US(baudrate) (12 * USEC_PER_SEC / baudrate)

 struct mcux_lpi2c_config {
 	LPI2C_Type *base;
 	const struct device *clock_dev;
 	clock_control_subsys_t clock_subsys;
 	void (*irq_config_func)(const struct device *dev);
 	uint32_t bitrate;
 	uint32_t bus_idle_timeout_ns;
 	const struct pinctrl_dev_config *pincfg;
 #ifdef CONFIG_I2C_MCUX_LPI2C_BUS_RECOVERY
 	struct gpio_dt_spec scl;
 	struct gpio_dt_spec sda;
 #endif /* CONFIG_I2C_MCUX_LPI2C_BUS_RECOVERY */
 };

 struct mcux_lpi2c_data {
 	lpi2c_master_handle_t handle;
 	struct k_sem lock;
 	struct k_sem device_sync_sem;
 	status_t callback_status;
 #ifdef CONFIG_I2C_TARGET
 	lpi2c_slave_handle_t target_handle;
 	struct i2c_target_config *target_cfg;
 	bool target_attached;
 	bool first_tx;
 	bool read_active;
 	bool send_ack;
 #endif
 };

 static int mcux_lpi2c_configure(const struct device *dev,
 				uint32_t dev_config_raw)
 {
 	const struct mcux_lpi2c_config *config = dev->config;
 	struct mcux_lpi2c_data *data = dev->data;
 	LPI2C_Type *base = config->base;
 	uint32_t clock_freq;
 	uint32_t baudrate;
 	int ret;

 	if (!(I2C_MODE_CONTROLLER & dev_config_raw)) {
 		return -EINVAL;
 	}

 	if (I2C_ADDR_10_BITS & dev_config_raw) {
 		return -EINVAL;
 	}

 	switch (I2C_SPEED_GET(dev_config_raw)) {
 	case I2C_SPEED_STANDARD:
 		baudrate = KHZ(100);
 		break;
 	case I2C_SPEED_FAST:
 		baudrate = KHZ(400);
 		break;
 	case I2C_SPEED_FAST_PLUS:
 		baudrate = MHZ(1);
 		break;
 	default:
 		return -EINVAL;
 	}

 	if (clock_control_get_rate(config->clock_dev, config->clock_subsys,
 				   &clock_freq)) {
 		return -EINVAL;
 	}

 	ret = k_sem_take(&data->lock, K_FOREVER);
 	if (ret) {
 		return ret;
 	}

 	LPI2C_MasterSetBaudRate(base, clock_freq, baudrate);
 	k_sem_give(&data->lock);

 	return 0;
 }

 static void mcux_lpi2c_master_transfer_callback(LPI2C_Type *base,
 						lpi2c_master_handle_t *handle,
 						status_t status, void *userData)
 {
 	struct mcux_lpi2c_data *data = userData;

 	ARG_UNUSED(handle);
 	ARG_UNUSED(base);

 	data->callback_status = status;
 	k_sem_give(&data->device_sync_sem);
 }

 static uint32_t mcux_lpi2c_convert_flags(int msg_flags)
 {
 	uint32_t flags = 0U;

 	if (!(msg_flags & I2C_MSG_STOP)) {
 		flags |= kLPI2C_TransferNoStopFlag;
 	}

 	if (msg_flags & I2C_MSG_RESTART) {
 		flags |= kLPI2C_TransferRepeatedStartFlag;
 	}

 	return flags;
 }

 static int mcux_lpi2c_transfer(const struct device *dev, struct i2c_msg *msgs,
 			       uint8_t num_msgs, uint16_t addr)
 {
 	const struct mcux_lpi2c_config *config = dev->config;
 	struct mcux_lpi2c_data *data = dev->data;
 	LPI2C_Type *base = config->base;
 	lpi2c_master_transfer_t transfer;
 	status_t status;
 	int ret = 0;

 	ret = k_sem_take(&data->lock, K_FOREVER);
 	if (ret) {
 		return ret;
 	}

 	/* Iterate over all the messages */
 	for (int i = 0; i < num_msgs; i++) {
 		if (I2C_MSG_ADDR_10_BITS & msgs->flags) {
 			ret = -ENOTSUP;
 			break;
 		}

 		/* Initialize the transfer descriptor */
 		transfer.flags = mcux_lpi2c_convert_flags(msgs->flags);

 		/* Prevent the controller to send a start condition between
 		 * messages, except if explicitly requested.
 		 */
 		if (i != 0 && !(msgs->flags & I2C_MSG_RESTART)) {
 			transfer.flags |= kLPI2C_TransferNoStartFlag;
 		}

 		transfer.slaveAddress = addr;
 		transfer.direction = (msgs->flags & I2C_MSG_READ)
 			? kLPI2C_Read : kLPI2C_Write;
 		transfer.subaddress = 0;
 		transfer.subaddressSize = 0;
 		transfer.data = msgs->buf;
 		transfer.dataSize = msgs->len;

 		/* Start the transfer */
 		status = LPI2C_MasterTransferNonBlocking(base,
 				&data->handle, &transfer);

 		/* Return an error if the transfer didn't start successfully
 		 * e.g., if the bus was busy
 		 */
 		if (status != kStatus_Success) {
 			LPI2C_MasterTransferAbort(base, &data->handle);
 			ret = -EIO;
 			break;
 		}

 		/* Wait for the transfer to complete */
 		k_sem_take(&data->device_sync_sem, K_FOREVER);

 		/* Return an error if the transfer didn't complete
 		 * successfully. e.g., nak, timeout, lost arbitration
 		 */
 		if (data->callback_status != kStatus_Success) {
 			LPI2C_MasterTransferAbort(base, &data->handle);
 			ret = -EIO;
 			break;
 		}
 		if (msgs->len == 0) {
 			k_busy_wait(SCAN_DELAY_US(config->bitrate));
 			if (0 != (base->MSR & LPI2C_MSR_NDF_MASK)) {
 				LPI2C_MasterTransferAbort(base, &data->handle);
 				ret = -EIO;
 				break;
 			}
 		}
 		/* Move to the next message */
 		msgs++;
 	}

 	k_sem_give(&data->lock);

 	return ret;
 }

 #if CONFIG_I2C_MCUX_LPI2C_BUS_RECOVERY
 static void mcux_lpi2c_bitbang_set_scl(void *io_context, int state)
 {
 	const struct mcux_lpi2c_config *config = io_context;

 	gpio_pin_set_dt(&config->scl, state);
 }

 static void mcux_lpi2c_bitbang_set_sda(void *io_context, int state)
 {
 	const struct mcux_lpi2c_config *config = io_context;

 	gpio_pin_set_dt(&config->sda, state);
 }

 static int mcux_lpi2c_bitbang_get_sda(void *io_context)
 {
 	const struct mcux_lpi2c_config *config = io_context;

 	return gpio_pin_get_dt(&config->sda) == 0 ? 0 : 1;
 }

 static int mcux_lpi2c_recover_bus(const struct device *dev)
 {
 	const struct mcux_lpi2c_config *config = dev->config;
 	struct mcux_lpi2c_data *data = dev->data;
 	struct i2c_bitbang bitbang_ctx;
 	struct i2c_bitbang_io bitbang_io = {
 		.set_scl = mcux_lpi2c_bitbang_set_scl,
 		.set_sda = mcux_lpi2c_bitbang_set_sda,
 		.get_sda = mcux_lpi2c_bitbang_get_sda,
 	};
 	uint32_t bitrate_cfg;
 	int error = 0;

 	if (!device_is_ready(config->scl.port)) {
 		LOG_ERR("SCL GPIO device not ready");
 		return -EIO;
 	}

 	if (!device_is_ready(config->sda.port)) {
 		LOG_ERR("SDA GPIO device not ready");
 		return -EIO;
 	}

 	k_sem_take(&data->lock, K_FOREVER);

 	error = gpio_pin_configure_dt(&config->scl, GPIO_OUTPUT_HIGH);
 	if (error != 0) {
 		LOG_ERR("failed to configure SCL GPIO (err %d)", error);
 		goto restore;
 	}

 	error = gpio_pin_configure_dt(&config->sda, GPIO_OUTPUT_HIGH);
 	if (error != 0) {
 		LOG_ERR("failed to configure SDA GPIO (err %d)", error);
 		goto restore;
 	}

 	i2c_bitbang_init(&bitbang_ctx, &bitbang_io, (void *)config);

 	bitrate_cfg = i2c_map_dt_bitrate(config->bitrate) | I2C_MODE_CONTROLLER;
 	error = i2c_bitbang_configure(&bitbang_ctx, bitrate_cfg);
 	if (error != 0) {
 		LOG_ERR("failed to configure I2C bitbang (err %d)", error);
 		goto restore;
 	}

 	error = i2c_bitbang_recover_bus(&bitbang_ctx);
 	if (error != 0) {
 		LOG_ERR("failed to recover bus (err %d)", error);
 		goto restore;
 	}

 restore:
 	(void)pinctrl_apply_state(config->pincfg, PINCTRL_STATE_DEFAULT);

 	k_sem_give(&data->lock);

 	return error;
 }
 #endif /* CONFIG_I2C_MCUX_LPI2C_BUS_RECOVERY */

 #ifdef CONFIG_I2C_TARGET
 static void mcux_lpi2c_slave_irq_handler(const struct device *dev)
 {
 	const struct mcux_lpi2c_config *config = dev->config;
 	struct mcux_lpi2c_data *data = dev->data;
 	const struct i2c_target_callbacks *target_cb = data->target_cfg->callbacks;
 	int ret;
 	uint32_t flags;
 	uint8_t i2c_data;

 	/* Note- the HAL provides a callback-based I2C slave API, but
 	 * the API expects the user to provide a transmit buffer of
 	 * a fixed length at the first byte received, and will not signal
 	 * the user callback until this buffer is exhausted. This does not
 	 * work well with the Zephyr API, which requires callbacks for
 	 * every byte. For these reason, we handle the LPI2C IRQ
 	 * directly.
 	 */
 	flags = LPI2C_SlaveGetStatusFlags(config->base);

 	if (flags & kLPI2C_SlaveAddressValidFlag) {
 		/* Read Slave address to clear flag */
 		LPI2C_SlaveGetReceivedAddress(config->base);
 		data->first_tx = true;
 		/* Reset to sending ACK, in case we NAK'ed before */
 		data->send_ack = true;
 	}

 	if (flags & kLPI2C_SlaveRxReadyFlag) {
 		/* RX data is available, read it and issue callback */
 		i2c_data = (uint8_t)config->base->SRDR;
 		if (data->first_tx) {
 			data->first_tx = false;
 			if (target_cb->write_requested) {
 				ret = target_cb->write_requested(data->target_cfg);
 				if (ret < 0) {
 					/* NAK further bytes */
 					data->send_ack = false;
 				}
 			}
 		}
 		if (target_cb->write_received) {
 			ret = target_cb->write_received(data->target_cfg,
 							i2c_data);
 			if (ret < 0) {
 				/* NAK further bytes */
 				data->send_ack = false;
 			}
 		}
 	}

 	if (flags & kLPI2C_SlaveTxReadyFlag) {
 		/* Space is available in TX fifo, issue callback and write out */
 		if (data->first_tx) {
 			data->read_active = true;
 			data->first_tx = false;
 			if (target_cb->read_requested) {
 				ret = target_cb->read_requested(data->target_cfg,
 								&i2c_data);
 				if (ret < 0) {
 					/* Disable TX */
 					data->read_active = false;
 				} else {
 					/* Send I2C data */
 					config->base->STDR = i2c_data;
 				}
 			}
 		} else if (data->read_active) {
 			if (target_cb->read_processed) {
 				ret = target_cb->read_processed(data->target_cfg,
 								&i2c_data);
 				if (ret < 0) {
 					/* Disable TX */
 					data->read_active = false;
 				} else {
 					/* Send I2C data */
 					config->base->STDR = i2c_data;
 				}
 			}
 		}
 	}

 	if (flags & kLPI2C_SlaveStopDetectFlag) {
 		LPI2C_SlaveClearStatusFlags(config->base, flags);
 		if (target_cb->stop) {
 			target_cb->stop(data->target_cfg);
 		}
 	}

 	if (flags & kLPI2C_SlaveTransmitAckFlag) {
 		LPI2C_SlaveTransmitAck(config->base, data->send_ack);
 	}
 }

 static int mcux_lpi2c_target_register(const struct device *dev,
 				      struct i2c_target_config *target_config)
 {
 	const struct mcux_lpi2c_config *config = dev->config;
 	struct mcux_lpi2c_data *data = dev->data;
 	lpi2c_slave_config_t slave_config;
 	uint32_t clock_freq;

 	LPI2C_MasterDeinit(config->base);

 	/* Get the clock frequency */
 	if (clock_control_get_rate(config->clock_dev, config->clock_subsys,
 				   &clock_freq)) {
 		return -EINVAL;
 	}

 	if (!target_config) {
 		return -EINVAL;
 	}

 	if (data->target_attached) {
 		return -EBUSY;
 	}

 	data->target_attached = true;
 	data->target_cfg = target_config;
 	data->first_tx = false;

 	LPI2C_SlaveGetDefaultConfig(&slave_config);
 	slave_config.address0 = target_config->address;
 	/* Note- this setting enables clock stretching to allow the
 	 * slave to respond to each byte with an ACK/NAK.
 	 * this behavior may cause issues with some I2C controllers.
 	 */
 	slave_config.sclStall.enableAck = true;
 	LPI2C_SlaveInit(config->base, &slave_config, clock_freq);
 	/* Clear all flags. */
 	LPI2C_SlaveClearStatusFlags(config->base, (uint32_t)kLPI2C_SlaveClearFlags);
 	/* Enable interrupt */
 	LPI2C_SlaveEnableInterrupts(config->base,
 					(kLPI2C_SlaveTxReadyFlag |
 					kLPI2C_SlaveRxReadyFlag |
 					kLPI2C_SlaveStopDetectFlag |
 					kLPI2C_SlaveAddressValidFlag |
 					kLPI2C_SlaveTransmitAckFlag));
 	return 0;
 }

 static int mcux_lpi2c_target_unregister(const struct device *dev,
 					struct i2c_target_config *target_config)
 {
 	const struct mcux_lpi2c_config *config = dev->config;
 	struct mcux_lpi2c_data *data = dev->data;

 	if (!data->target_attached) {
 		return -EINVAL;
 	}

 	data->target_cfg = NULL;
 	data->target_attached = false;

 	LPI2C_SlaveDeinit(config->base);

 	return 0;
 }
 #endif /* CONFIG_I2C_TARGET */

 static void mcux_lpi2c_isr(const struct device *dev)
 {
 	const struct mcux_lpi2c_config *config = dev->config;
 	struct mcux_lpi2c_data *data = dev->data;
 	LPI2C_Type *base = config->base;

  #ifdef CONFIG_I2C_TARGET
 	if (data->target_attached) {
 		mcux_lpi2c_slave_irq_handler(dev);
 	}
 #endif /* CONFIG_I2C_TARGET */

 	LPI2C_MasterTransferHandleIRQ(base, &data->handle);
 }

 static int mcux_lpi2c_init(const struct device *dev)
 {
 	const struct mcux_lpi2c_config *config = dev->config;
 	struct mcux_lpi2c_data *data = dev->data;
 	LPI2C_Type *base = config->base;
 	uint32_t clock_freq, bitrate_cfg;
 	lpi2c_master_config_t master_config;
 	int error;

 	k_sem_init(&data->lock, 1, 1);
 	k_sem_init(&data->device_sync_sem, 0, K_SEM_MAX_LIMIT);

 	if (!device_is_ready(config->clock_dev)) {
 		LOG_ERR("clock control device not ready");
 		return -ENODEV;
 	}

 	if (clock_control_get_rate(config->clock_dev, config->clock_subsys,
 				   &clock_freq)) {
 		return -EINVAL;
 	}

 	LPI2C_MasterGetDefaultConfig(&master_config);
 	master_config.busIdleTimeout_ns = config->bus_idle_timeout_ns;
 	LPI2C_MasterInit(base, &master_config, clock_freq);
 	LPI2C_MasterTransferCreateHandle(base, &data->handle,
 					 mcux_lpi2c_master_transfer_callback,
 					 data);

 	bitrate_cfg = i2c_map_dt_bitrate(config->bitrate);

 	error = mcux_lpi2c_configure(dev, I2C_MODE_CONTROLLER | bitrate_cfg);
 	if (error) {
 		return error;
 	}

 	error = pinctrl_apply_state(config->pincfg, PINCTRL_STATE_DEFAULT);
 	if (error) {
 		return error;
 	}

 	config->irq_config_func(dev);

 	return 0;
 }

 static const struct i2c_driver_api mcux_lpi2c_driver_api = {
 	.configure = mcux_lpi2c_configure,
 	.transfer = mcux_lpi2c_transfer,
 #if CONFIG_I2C_MCUX_LPI2C_BUS_RECOVERY
 	.recover_bus = mcux_lpi2c_recover_bus,
 #endif /* CONFIG_I2C_MCUX_LPI2C_BUS_RECOVERY */
 #if CONFIG_I2C_TARGET
 	.target_register = mcux_lpi2c_target_register,
 	.target_unregister = mcux_lpi2c_target_unregister,
 #endif /* CONFIG_I2C_TARGET */
 };

 #if CONFIG_I2C_MCUX_LPI2C_BUS_RECOVERY
 #define I2C_MCUX_LPI2C_SCL_INIT(n) .scl = GPIO_DT_SPEC_INST_GET_OR(n, scl_gpios, {0}),
 #define I2C_MCUX_LPI2C_SDA_INIT(n) .sda = GPIO_DT_SPEC_INST_GET_OR(n, sda_gpios, {0}),
 #else
 #define I2C_MCUX_LPI2C_SCL_INIT(n)
 #define I2C_MCUX_LPI2C_SDA_INIT(n)
 #endif /* CONFIG_I2C_MCUX_LPI2C_BUS_RECOVERY */

 #define I2C_MCUX_LPI2C_INIT(n)						\
 	PINCTRL_DT_INST_DEFINE(n);					\
 									\
 	static void mcux_lpi2c_config_func_##n(const struct device *dev); \
 									\
 	static const struct mcux_lpi2c_config mcux_lpi2c_config_##n = {	\
 		.base = (LPI2C_Type *)DT_INST_REG_ADDR(n),		\
 		.clock_dev = DEVICE_DT_GET(DT_INST_CLOCKS_CTLR(n)),	\
 		.clock_subsys =						\
 			(clock_control_subsys_t)DT_INST_CLOCKS_CELL(n, name),\
 		.irq_config_func = mcux_lpi2c_config_func_##n,		\
 		.bitrate = DT_INST_PROP(n, clock_frequency),		\
 		.pincfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n),		\
 		I2C_MCUX_LPI2C_SCL_INIT(n)				\
 		I2C_MCUX_LPI2C_SDA_INIT(n)				\
 		.bus_idle_timeout_ns =					\
 			UTIL_AND(DT_INST_NODE_HAS_PROP(n, bus_idle_timeout),\
 				 DT_INST_PROP(n, bus_idle_timeout)),	\
 	};								\
 									\
 	static struct mcux_lpi2c_data mcux_lpi2c_data_##n;		\
 									\
 	I2C_DEVICE_DT_INST_DEFINE(n, mcux_lpi2c_init, NULL,		\
 			    &mcux_lpi2c_data_##n,			\
 			    &mcux_lpi2c_config_##n, POST_KERNEL,	\
 			    CONFIG_I2C_INIT_PRIORITY,			\
 			    &mcux_lpi2c_driver_api);			\
 									\
 	static void mcux_lpi2c_config_func_##n(const struct device *dev) \
 	{								\
 		IRQ_CONNECT(DT_INST_IRQN(n),				\
 			    DT_INST_IRQ(n, priority),			\
 			    mcux_lpi2c_isr,				\
 			    DEVICE_DT_INST_GET(n), 0);			\
 									\
 		irq_enable(DT_INST_IRQN(n));				\
 	}

 DT_INST_FOREACH_STATUS_OKAY(I2C_MCUX_LPI2C_INIT)
	/*
	* Copyright (c) 2016 Freescale Semiconductor, Inc.
	* Copyright 2019-2023, NXP
	* Copyright (c) 2022 Vestas Wind Systems A/S
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#define DT_DRV_COMPAT nxp_imx_lpi2c

	#include <errno.h>
	#include <zephyr/drivers/i2c.h>
	#include <zephyr/drivers/clock_control.h>
	#include <zephyr/kernel.h>
	#include <zephyr/irq.h>
	#include <fsl_lpi2c.h>

	#include <zephyr/drivers/pinctrl.h>

	#ifdef CONFIG_I2C_MCUX_LPI2C_BUS_RECOVERY
	#include "i2c_bitbang.h"
	#include <zephyr/drivers/gpio.h>
	#endif /* CONFIG_I2C_MCUX_LPI2C_BUS_RECOVERY */

	#include <zephyr/logging/log.h>
	LOG_MODULE_REGISTER(mcux_lpi2c);


	#include "i2c-priv.h"
	/* Wait for the duration of 12 bits to detect a NAK after a bus
	* address scan. (10 appears sufficient, 20% safety factor.)
	*/
	#define SCAN_DELAY_US(baudrate) (12 * USEC_PER_SEC / baudrate)

	struct mcux_lpi2c_config {
	LPI2C_Type *base;
	const struct device *clock_dev;
	clock_control_subsys_t clock_subsys;
	void (irq_config_func)(const struct device dev);
	uint32_t bitrate;
	uint32_t bus_idle_timeout_ns;
	const struct pinctrl_dev_config *pincfg;
	#ifdef CONFIG_I2C_MCUX_LPI2C_BUS_RECOVERY
	struct gpio_dt_spec scl;
	struct gpio_dt_spec sda;
	#endif /* CONFIG_I2C_MCUX_LPI2C_BUS_RECOVERY */
	};

	struct mcux_lpi2c_data {
	lpi2c_master_handle_t handle;
	struct k_sem lock;
	struct k_sem device_sync_sem;
	status_t callback_status;
	#ifdef CONFIG_I2C_TARGET
	lpi2c_slave_handle_t target_handle;
	struct i2c_target_config *target_cfg;
	bool target_attached;
	bool first_tx;
	bool read_active;
	bool send_ack;
	#endif
	};

	static int mcux_lpi2c_configure(const struct device *dev,
	uint32_t dev_config_raw)
	{
	const struct mcux_lpi2c_config *config = dev->config;
	struct mcux_lpi2c_data *data = dev->data;
	LPI2C_Type *base = config->base;
	uint32_t clock_freq;
	uint32_t baudrate;
	int ret;

	if (!(I2C_MODE_CONTROLLER & dev_config_raw)) {
	return -EINVAL;
	}

	if (I2C_ADDR_10_BITS & dev_config_raw) {
	return -EINVAL;
	}

	switch (I2C_SPEED_GET(dev_config_raw)) {
	case I2C_SPEED_STANDARD:
	baudrate = KHZ(100);
	break;
	case I2C_SPEED_FAST:
	baudrate = KHZ(400);
	break;
	case I2C_SPEED_FAST_PLUS:
	baudrate = MHZ(1);
	break;
	default:
	return -EINVAL;
	}

	if (clock_control_get_rate(config->clock_dev, config->clock_subsys,
	&clock_freq)) {
	return -EINVAL;
	}

	ret = k_sem_take(&data->lock, K_FOREVER);
	if (ret) {
	return ret;
	}

	LPI2C_MasterSetBaudRate(base, clock_freq, baudrate);
	k_sem_give(&data->lock);

	return 0;
	}

	static void mcux_lpi2c_master_transfer_callback(LPI2C_Type *base,
	lpi2c_master_handle_t *handle,
	status_t status, void *userData)
	{
	struct mcux_lpi2c_data *data = userData;

	ARG_UNUSED(handle);
	ARG_UNUSED(base);

	data->callback_status = status;
	k_sem_give(&data->device_sync_sem);
	}

	static uint32_t mcux_lpi2c_convert_flags(int msg_flags)
	{
	uint32_t flags = 0U;

	if (!(msg_flags & I2C_MSG_STOP)) {
	flags \|= kLPI2C_TransferNoStopFlag;
	}

	if (msg_flags & I2C_MSG_RESTART) {
	flags \|= kLPI2C_TransferRepeatedStartFlag;
	}

	return flags;
	}

	static int mcux_lpi2c_transfer(const struct device dev, struct i2c_msg msgs,
	uint8_t num_msgs, uint16_t addr)
	{
	const struct mcux_lpi2c_config *config = dev->config;
	struct mcux_lpi2c_data *data = dev->data;
	LPI2C_Type *base = config->base;
	lpi2c_master_transfer_t transfer;
	status_t status;
	int ret = 0;

	ret = k_sem_take(&data->lock, K_FOREVER);
	if (ret) {
	return ret;
	}

	/* Iterate over all the messages */
	for (int i = 0; i < num_msgs; i++) {
	if (I2C_MSG_ADDR_10_BITS & msgs->flags) {
	ret = -ENOTSUP;
	break;
	}

	/* Initialize the transfer descriptor */
	transfer.flags = mcux_lpi2c_convert_flags(msgs->flags);

	/* Prevent the controller to send a start condition between
	* messages, except if explicitly requested.
	*/
	if (i != 0 && !(msgs->flags & I2C_MSG_RESTART)) {
	transfer.flags \|= kLPI2C_TransferNoStartFlag;
	}

	transfer.slaveAddress = addr;
	transfer.direction = (msgs->flags & I2C_MSG_READ)
	? kLPI2C_Read : kLPI2C_Write;
	transfer.subaddress = 0;
	transfer.subaddressSize = 0;
	transfer.data = msgs->buf;
	transfer.dataSize = msgs->len;

	/* Start the transfer */
	status = LPI2C_MasterTransferNonBlocking(base,
	&data->handle, &transfer);

	/* Return an error if the transfer didn't start successfully
	* e.g., if the bus was busy
	*/
	if (status != kStatus_Success) {
	LPI2C_MasterTransferAbort(base, &data->handle);
	ret = -EIO;
	break;
	}

	/* Wait for the transfer to complete */
	k_sem_take(&data->device_sync_sem, K_FOREVER);

	/* Return an error if the transfer didn't complete
	* successfully. e.g., nak, timeout, lost arbitration
	*/
	if (data->callback_status != kStatus_Success) {
	LPI2C_MasterTransferAbort(base, &data->handle);
	ret = -EIO;
	break;
	}
	if (msgs->len == 0) {
	k_busy_wait(SCAN_DELAY_US(config->bitrate));
	if (0 != (base->MSR & LPI2C_MSR_NDF_MASK)) {
	LPI2C_MasterTransferAbort(base, &data->handle);
	ret = -EIO;
	break;
	}
	}
	/* Move to the next message */
	msgs++;
	}

	k_sem_give(&data->lock);

	return ret;
	}

	#if CONFIG_I2C_MCUX_LPI2C_BUS_RECOVERY
	static void mcux_lpi2c_bitbang_set_scl(void *io_context, int state)
	{
	const struct mcux_lpi2c_config *config = io_context;

	gpio_pin_set_dt(&config->scl, state);
	}

	static void mcux_lpi2c_bitbang_set_sda(void *io_context, int state)
	{
	const struct mcux_lpi2c_config *config = io_context;

	gpio_pin_set_dt(&config->sda, state);
	}

	static int mcux_lpi2c_bitbang_get_sda(void *io_context)
	{
	const struct mcux_lpi2c_config *config = io_context;

	return gpio_pin_get_dt(&config->sda) == 0 ? 0 : 1;
	}

	static int mcux_lpi2c_recover_bus(const struct device *dev)
	{
	const struct mcux_lpi2c_config *config = dev->config;
	struct mcux_lpi2c_data *data = dev->data;
	struct i2c_bitbang bitbang_ctx;
	struct i2c_bitbang_io bitbang_io = {
	.set_scl = mcux_lpi2c_bitbang_set_scl,
	.set_sda = mcux_lpi2c_bitbang_set_sda,
	.get_sda = mcux_lpi2c_bitbang_get_sda,
	};
	uint32_t bitrate_cfg;
	int error = 0;

	if (!device_is_ready(config->scl.port)) {
	LOG_ERR("SCL GPIO device not ready");
	return -EIO;
	}

	if (!device_is_ready(config->sda.port)) {
	LOG_ERR("SDA GPIO device not ready");
	return -EIO;
	}

	k_sem_take(&data->lock, K_FOREVER);

	error = gpio_pin_configure_dt(&config->scl, GPIO_OUTPUT_HIGH);
	if (error != 0) {
	LOG_ERR("failed to configure SCL GPIO (err %d)", error);
	goto restore;
	}

	error = gpio_pin_configure_dt(&config->sda, GPIO_OUTPUT_HIGH);
	if (error != 0) {
	LOG_ERR("failed to configure SDA GPIO (err %d)", error);
	goto restore;
	}

	i2c_bitbang_init(&bitbang_ctx, &bitbang_io, (void *)config);

	bitrate_cfg = i2c_map_dt_bitrate(config->bitrate) \| I2C_MODE_CONTROLLER;
	error = i2c_bitbang_configure(&bitbang_ctx, bitrate_cfg);
	if (error != 0) {
	LOG_ERR("failed to configure I2C bitbang (err %d)", error);
	goto restore;
	}

	error = i2c_bitbang_recover_bus(&bitbang_ctx);
	if (error != 0) {
	LOG_ERR("failed to recover bus (err %d)", error);
	goto restore;
	}

	restore:
	(void)pinctrl_apply_state(config->pincfg, PINCTRL_STATE_DEFAULT);

	k_sem_give(&data->lock);

	return error;
	}
	#endif /* CONFIG_I2C_MCUX_LPI2C_BUS_RECOVERY */

	#ifdef CONFIG_I2C_TARGET
	static void mcux_lpi2c_slave_irq_handler(const struct device *dev)
	{
	const struct mcux_lpi2c_config *config = dev->config;
	struct mcux_lpi2c_data *data = dev->data;
	const struct i2c_target_callbacks *target_cb = data->target_cfg->callbacks;
	int ret;
	uint32_t flags;
	uint8_t i2c_data;

	/* Note- the HAL provides a callback-based I2C slave API, but
	* the API expects the user to provide a transmit buffer of
	* a fixed length at the first byte received, and will not signal
	* the user callback until this buffer is exhausted. This does not
	* work well with the Zephyr API, which requires callbacks for
	* every byte. For these reason, we handle the LPI2C IRQ
	* directly.
	*/
	flags = LPI2C_SlaveGetStatusFlags(config->base);

	if (flags & kLPI2C_SlaveAddressValidFlag) {
	/* Read Slave address to clear flag */
	LPI2C_SlaveGetReceivedAddress(config->base);
	data->first_tx = true;
	/* Reset to sending ACK, in case we NAK'ed before */
	data->send_ack = true;
	}

	if (flags & kLPI2C_SlaveRxReadyFlag) {
	/* RX data is available, read it and issue callback */
	i2c_data = (uint8_t)config->base->SRDR;
	if (data->first_tx) {
	data->first_tx = false;
	if (target_cb->write_requested) {
	ret = target_cb->write_requested(data->target_cfg);
	if (ret < 0) {
	/* NAK further bytes */
	data->send_ack = false;
	}
	}
	}
	if (target_cb->write_received) {
	ret = target_cb->write_received(data->target_cfg,
	i2c_data);
	if (ret < 0) {
	/* NAK further bytes */
	data->send_ack = false;
	}
	}
	}

	if (flags & kLPI2C_SlaveTxReadyFlag) {
	/* Space is available in TX fifo, issue callback and write out */
	if (data->first_tx) {
	data->read_active = true;
	data->first_tx = false;
	if (target_cb->read_requested) {
	ret = target_cb->read_requested(data->target_cfg,
	&i2c_data);
	if (ret < 0) {
	/* Disable TX */
	data->read_active = false;
	} else {
	/* Send I2C data */
	config->base->STDR = i2c_data;
	}
	}
	} else if (data->read_active) {
	if (target_cb->read_processed) {
	ret = target_cb->read_processed(data->target_cfg,
	&i2c_data);
	if (ret < 0) {
	/* Disable TX */
	data->read_active = false;
	} else {
	/* Send I2C data */
	config->base->STDR = i2c_data;
	}
	}
	}
	}

	if (flags & kLPI2C_SlaveStopDetectFlag) {
	LPI2C_SlaveClearStatusFlags(config->base, flags);
	if (target_cb->stop) {
	target_cb->stop(data->target_cfg);
	}
	}

	if (flags & kLPI2C_SlaveTransmitAckFlag) {
	LPI2C_SlaveTransmitAck(config->base, data->send_ack);
	}
	}

	static int mcux_lpi2c_target_register(const struct device *dev,
	struct i2c_target_config *target_config)
	{
	const struct mcux_lpi2c_config *config = dev->config;
	struct mcux_lpi2c_data *data = dev->data;
	lpi2c_slave_config_t slave_config;
	uint32_t clock_freq;

	LPI2C_MasterDeinit(config->base);

	/* Get the clock frequency */
	if (clock_control_get_rate(config->clock_dev, config->clock_subsys,
	&clock_freq)) {
	return -EINVAL;
	}

	if (!target_config) {
	return -EINVAL;
	}

	if (data->target_attached) {
	return -EBUSY;
	}

	data->target_attached = true;
	data->target_cfg = target_config;
	data->first_tx = false;

	LPI2C_SlaveGetDefaultConfig(&slave_config);
	slave_config.address0 = target_config->address;
	/* Note- this setting enables clock stretching to allow the
	* slave to respond to each byte with an ACK/NAK.
	* this behavior may cause issues with some I2C controllers.
	*/
	slave_config.sclStall.enableAck = true;
	LPI2C_SlaveInit(config->base, &slave_config, clock_freq);
	/* Clear all flags. */
	LPI2C_SlaveClearStatusFlags(config->base, (uint32_t)kLPI2C_SlaveClearFlags);
	/* Enable interrupt */
	LPI2C_SlaveEnableInterrupts(config->base,
	(kLPI2C_SlaveTxReadyFlag \|
	kLPI2C_SlaveRxReadyFlag \|
	kLPI2C_SlaveStopDetectFlag \|
	kLPI2C_SlaveAddressValidFlag \|
	kLPI2C_SlaveTransmitAckFlag));
	return 0;
	}

	static int mcux_lpi2c_target_unregister(const struct device *dev,
	struct i2c_target_config *target_config)
	{
	const struct mcux_lpi2c_config *config = dev->config;
	struct mcux_lpi2c_data *data = dev->data;

	if (!data->target_attached) {
	return -EINVAL;
	}

	data->target_cfg = NULL;
	data->target_attached = false;

	LPI2C_SlaveDeinit(config->base);

	return 0;
	}
	#endif /* CONFIG_I2C_TARGET */

	static void mcux_lpi2c_isr(const struct device *dev)
	{
	const struct mcux_lpi2c_config *config = dev->config;
	struct mcux_lpi2c_data *data = dev->data;
	LPI2C_Type *base = config->base;

	#ifdef CONFIG_I2C_TARGET
	if (data->target_attached) {
	mcux_lpi2c_slave_irq_handler(dev);
	}
	#endif /* CONFIG_I2C_TARGET */

	LPI2C_MasterTransferHandleIRQ(base, &data->handle);
	}

	static int mcux_lpi2c_init(const struct device *dev)
	{
	const struct mcux_lpi2c_config *config = dev->config;
	struct mcux_lpi2c_data *data = dev->data;
	LPI2C_Type *base = config->base;
	uint32_t clock_freq, bitrate_cfg;
	lpi2c_master_config_t master_config;
	int error;

	k_sem_init(&data->lock, 1, 1);
	k_sem_init(&data->device_sync_sem, 0, K_SEM_MAX_LIMIT);

	if (!device_is_ready(config->clock_dev)) {
	LOG_ERR("clock control device not ready");
	return -ENODEV;
	}

	if (clock_control_get_rate(config->clock_dev, config->clock_subsys,
	&clock_freq)) {
	return -EINVAL;
	}

	LPI2C_MasterGetDefaultConfig(&master_config);
	master_config.busIdleTimeout_ns = config->bus_idle_timeout_ns;
	LPI2C_MasterInit(base, &master_config, clock_freq);
	LPI2C_MasterTransferCreateHandle(base, &data->handle,
	mcux_lpi2c_master_transfer_callback,
	data);

	bitrate_cfg = i2c_map_dt_bitrate(config->bitrate);

	error = mcux_lpi2c_configure(dev, I2C_MODE_CONTROLLER \| bitrate_cfg);
	if (error) {
	return error;
	}

	error = pinctrl_apply_state(config->pincfg, PINCTRL_STATE_DEFAULT);
	if (error) {
	return error;
	}

	config->irq_config_func(dev);

	return 0;
	}

	static const struct i2c_driver_api mcux_lpi2c_driver_api = {
	.configure = mcux_lpi2c_configure,
	.transfer = mcux_lpi2c_transfer,
	#if CONFIG_I2C_MCUX_LPI2C_BUS_RECOVERY
	.recover_bus = mcux_lpi2c_recover_bus,
	#endif /* CONFIG_I2C_MCUX_LPI2C_BUS_RECOVERY */
	#if CONFIG_I2C_TARGET
	.target_register = mcux_lpi2c_target_register,
	.target_unregister = mcux_lpi2c_target_unregister,
	#endif /* CONFIG_I2C_TARGET */
	};

	#if CONFIG_I2C_MCUX_LPI2C_BUS_RECOVERY
	#define I2C_MCUX_LPI2C_SCL_INIT(n) .scl = GPIO_DT_SPEC_INST_GET_OR(n, scl_gpios, {0}),
	#define I2C_MCUX_LPI2C_SDA_INIT(n) .sda = GPIO_DT_SPEC_INST_GET_OR(n, sda_gpios, {0}),
	#else
	#define I2C_MCUX_LPI2C_SCL_INIT(n)
	#define I2C_MCUX_LPI2C_SDA_INIT(n)
	#endif /* CONFIG_I2C_MCUX_LPI2C_BUS_RECOVERY */

	#define I2C_MCUX_LPI2C_INIT(n) \
	PINCTRL_DT_INST_DEFINE(n); \
	\
	static void mcux_lpi2c_config_func_##n(const struct device *dev); \
	\
	static const struct mcux_lpi2c_config mcux_lpi2c_config_##n = { \
	.base = (LPI2C_Type *)DT_INST_REG_ADDR(n), \
	.clock_dev = DEVICE_DT_GET(DT_INST_CLOCKS_CTLR(n)), \
	.clock_subsys = \
	(clock_control_subsys_t)DT_INST_CLOCKS_CELL(n, name),\
	.irq_config_func = mcux_lpi2c_config_func_##n, \
	.bitrate = DT_INST_PROP(n, clock_frequency), \
	.pincfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n), \
	I2C_MCUX_LPI2C_SCL_INIT(n) \
	I2C_MCUX_LPI2C_SDA_INIT(n) \
	.bus_idle_timeout_ns = \
	UTIL_AND(DT_INST_NODE_HAS_PROP(n, bus_idle_timeout),\
	DT_INST_PROP(n, bus_idle_timeout)), \
	}; \
	\
	static struct mcux_lpi2c_data mcux_lpi2c_data_##n; \
	\
	I2C_DEVICE_DT_INST_DEFINE(n, mcux_lpi2c_init, NULL, \
	&mcux_lpi2c_data_##n, \
	&mcux_lpi2c_config_##n, POST_KERNEL, \
	CONFIG_I2C_INIT_PRIORITY, \
	&mcux_lpi2c_driver_api); \
	\
	static void mcux_lpi2c_config_func_##n(const struct device *dev) \
	{ \
	IRQ_CONNECT(DT_INST_IRQN(n), \
	DT_INST_IRQ(n, priority), \
	mcux_lpi2c_isr, \
	DEVICE_DT_INST_GET(n), 0); \
	\
	irq_enable(DT_INST_IRQN(n)); \
	}

	DT_INST_FOREACH_STATUS_OKAY(I2C_MCUX_LPI2C_INIT)