drivers/serial/uart_mcux_flexcomm.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /*
  * Copyright (c) 2017, NXP
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #define DT_DRV_COMPAT nxp_lpc_usart

 /** @file
  * @brief USART driver for LPC54XXX and LPC55xxx families.
  *
  * Note:
  * - The driver is implemented for only one device, multiple instances
  * will be implemented in the future.
  */

 #include <errno.h>
 #include <zephyr/device.h>
 #include <zephyr/drivers/uart.h>
 #include <zephyr/drivers/clock_control.h>
 #include <zephyr/irq.h>
 #include <fsl_usart.h>
 #include <soc.h>
 #include <fsl_device_registers.h>
 #include <zephyr/drivers/pinctrl.h>

 struct mcux_flexcomm_config {
 	USART_Type *base;
 	const struct device *clock_dev;
 	clock_control_subsys_t clock_subsys;
 	uint32_t baud_rate;
 	uint8_t parity;
 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 	void (*irq_config_func)(const struct device *dev);
 #endif
 	const struct pinctrl_dev_config *pincfg;
 };

 struct mcux_flexcomm_data {
 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 	uart_irq_callback_user_data_t callback;
 	void *cb_data;
 #endif
 #ifdef CONFIG_UART_USE_RUNTIME_CONFIGURE
 	struct uart_config uart_config;
 #endif
 };

 static int mcux_flexcomm_poll_in(const struct device *dev, unsigned char *c)
 {
 	const struct mcux_flexcomm_config *config = dev->config;
 	uint32_t flags = USART_GetStatusFlags(config->base);
 	int ret = -1;

 	if (flags & kUSART_RxFifoNotEmptyFlag) {
 		*c = USART_ReadByte(config->base);
 		ret = 0;
 	}

 	return ret;
 }

 static void mcux_flexcomm_poll_out(const struct device *dev,
 					     unsigned char c)
 {
 	const struct mcux_flexcomm_config *config = dev->config;

 	/* Wait until space is available in TX FIFO */
 	while (!(USART_GetStatusFlags(config->base) & kUSART_TxFifoEmptyFlag)) {
 	}

 	USART_WriteByte(config->base, c);
 }

 static int mcux_flexcomm_err_check(const struct device *dev)
 {
 	const struct mcux_flexcomm_config *config = dev->config;
 	uint32_t flags = USART_GetStatusFlags(config->base);
 	int err = 0;

 	if (flags & kStatus_USART_RxRingBufferOverrun) {
 		err |= UART_ERROR_OVERRUN;
 	}

 	if (flags & kStatus_USART_ParityError) {
 		err |= UART_ERROR_PARITY;
 	}

 	if (flags & kStatus_USART_FramingError) {
 		err |= UART_ERROR_FRAMING;
 	}

 	USART_ClearStatusFlags(config->base,
 			       kStatus_USART_RxRingBufferOverrun |
 			       kStatus_USART_ParityError |
 			       kStatus_USART_FramingError);

 	return err;
 }

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 static int mcux_flexcomm_fifo_fill(const struct device *dev,
 				   const uint8_t *tx_data,
 				   int len)
 {
 	const struct mcux_flexcomm_config *config = dev->config;
 	uint8_t num_tx = 0U;

 	while ((len - num_tx > 0) &&
 	       (USART_GetStatusFlags(config->base)
 		& kUSART_TxFifoNotFullFlag)) {

 		USART_WriteByte(config->base, tx_data[num_tx++]);
 	}

 	return num_tx;
 }

 static int mcux_flexcomm_fifo_read(const struct device *dev, uint8_t *rx_data,
 				   const int len)
 {
 	const struct mcux_flexcomm_config *config = dev->config;
 	uint8_t num_rx = 0U;

 	while ((len - num_rx > 0) &&
 	       (USART_GetStatusFlags(config->base)
 		& kUSART_RxFifoNotEmptyFlag)) {

 		rx_data[num_rx++] = USART_ReadByte(config->base);
 	}

 	return num_rx;
 }

 static void mcux_flexcomm_irq_tx_enable(const struct device *dev)
 {
 	const struct mcux_flexcomm_config *config = dev->config;
 	uint32_t mask = kUSART_TxLevelInterruptEnable;

 	USART_EnableInterrupts(config->base, mask);
 }

 static void mcux_flexcomm_irq_tx_disable(const struct device *dev)
 {
 	const struct mcux_flexcomm_config *config = dev->config;
 	uint32_t mask = kUSART_TxLevelInterruptEnable;

 	USART_DisableInterrupts(config->base, mask);
 }

 static int mcux_flexcomm_irq_tx_complete(const struct device *dev)
 {
 	const struct mcux_flexcomm_config *config = dev->config;

 	return (config->base->STAT & USART_STAT_TXIDLE_MASK) != 0;
 }

 static int mcux_flexcomm_irq_tx_ready(const struct device *dev)
 {
 	const struct mcux_flexcomm_config *config = dev->config;
 	uint32_t mask = kUSART_TxLevelInterruptEnable;
 	uint32_t flags = USART_GetStatusFlags(config->base);

 	return (USART_GetEnabledInterrupts(config->base) & mask)
 		&& (flags & kUSART_TxFifoEmptyFlag);
 }

 static void mcux_flexcomm_irq_rx_enable(const struct device *dev)
 {
 	const struct mcux_flexcomm_config *config = dev->config;
 	uint32_t mask = kUSART_RxLevelInterruptEnable;

 	USART_EnableInterrupts(config->base, mask);
 }

 static void mcux_flexcomm_irq_rx_disable(const struct device *dev)
 {
 	const struct mcux_flexcomm_config *config = dev->config;
 	uint32_t mask = kUSART_RxLevelInterruptEnable;

 	USART_DisableInterrupts(config->base, mask);
 }

 static int mcux_flexcomm_irq_rx_full(const struct device *dev)
 {
 	const struct mcux_flexcomm_config *config = dev->config;
 	uint32_t flags = USART_GetStatusFlags(config->base);

 	return (flags & kUSART_RxFifoNotEmptyFlag) != 0U;
 }

 static int mcux_flexcomm_irq_rx_pending(const struct device *dev)
 {
 	const struct mcux_flexcomm_config *config = dev->config;
 	uint32_t mask = kUSART_RxLevelInterruptEnable;

 	return (USART_GetEnabledInterrupts(config->base) & mask)
 		&& mcux_flexcomm_irq_rx_full(dev);
 }

 static void mcux_flexcomm_irq_err_enable(const struct device *dev)
 {
 	const struct mcux_flexcomm_config *config = dev->config;
 	uint32_t mask = kStatus_USART_NoiseError |
 			kStatus_USART_FramingError |
 			kStatus_USART_ParityError;

 	USART_EnableInterrupts(config->base, mask);
 }

 static void mcux_flexcomm_irq_err_disable(const struct device *dev)
 {
 	const struct mcux_flexcomm_config *config = dev->config;
 	uint32_t mask = kStatus_USART_NoiseError |
 			kStatus_USART_FramingError |
 			kStatus_USART_ParityError;

 	USART_DisableInterrupts(config->base, mask);
 }

 static int mcux_flexcomm_irq_is_pending(const struct device *dev)
 {
 	return (mcux_flexcomm_irq_tx_ready(dev)
 		|| mcux_flexcomm_irq_rx_pending(dev));
 }

 static int mcux_flexcomm_irq_update(const struct device *dev)
 {
 	return 1;
 }

 static void mcux_flexcomm_irq_callback_set(const struct device *dev,
 					   uart_irq_callback_user_data_t cb,
 					   void *cb_data)
 {
 	struct mcux_flexcomm_data *data = dev->data;

 	data->callback = cb;
 	data->cb_data = cb_data;
 }

 static void mcux_flexcomm_isr(const struct device *dev)
 {
 	struct mcux_flexcomm_data *data = dev->data;

 	if (data->callback) {
 		data->callback(dev, data->cb_data);
 	}
 }
 #endif /* CONFIG_UART_INTERRUPT_DRIVEN */

 #ifdef CONFIG_UART_USE_RUNTIME_CONFIGURE
 static int mcux_flexcomm_uart_configure(const struct device *dev, const struct uart_config *cfg)
 {
 	const struct mcux_flexcomm_config *config = dev->config;
 	struct mcux_flexcomm_data *data = dev->data;
 	struct uart_config *uart_config = &data->uart_config;
 	usart_config_t usart_config;
 	usart_parity_mode_t parity_mode;
 	usart_stop_bit_count_t stop_bits;
 	usart_data_len_t data_bits = kUSART_8BitsPerChar;
 	bool nine_bit_mode = false;
 	uint32_t clock_freq;

 	/* Set up structure to reconfigure UART */
 	USART_GetDefaultConfig(&usart_config);

 	/* Set parity */
 	if (cfg->parity == UART_CFG_PARITY_ODD) {
 		parity_mode = kUSART_ParityOdd;
 	} else if (cfg->parity == UART_CFG_PARITY_EVEN) {
 		parity_mode = kUSART_ParityEven;
 	} else if (cfg->parity == UART_CFG_PARITY_NONE) {
 		parity_mode = kUSART_ParityDisabled;
 	} else {
 		return -ENOTSUP;
 	}
 	usart_config.parityMode = parity_mode;

 	/* Set baudrate */
 	usart_config.baudRate_Bps = cfg->baudrate;

 	/* Set stop bits */
 	if (cfg->stop_bits == UART_CFG_STOP_BITS_1) {
 		stop_bits = kUSART_OneStopBit;
 	} else if (cfg->stop_bits == UART_CFG_STOP_BITS_2) {
 		stop_bits = kUSART_TwoStopBit;
 	} else {
 		return -ENOTSUP;
 	}
 	usart_config.stopBitCount = stop_bits;

 	/* Set data bits */
 	if (cfg->data_bits == UART_CFG_DATA_BITS_5 ||
 	    cfg->data_bits == UART_CFG_DATA_BITS_6) {
 		return -ENOTSUP;
 	} else if (cfg->data_bits == UART_CFG_DATA_BITS_7) {
 		data_bits = kUSART_7BitsPerChar;
 	} else if (cfg->data_bits == UART_CFG_DATA_BITS_8) {
 		data_bits = kUSART_8BitsPerChar;
 	} else if (cfg->data_bits == UART_CFG_DATA_BITS_9) {
 		nine_bit_mode = true;
 	} else {
 		return -EINVAL;
 	}
 	usart_config.bitCountPerChar = data_bits;

 	/* Set flow control */
 	if (cfg->flow_ctrl == UART_CFG_FLOW_CTRL_NONE) {
 		usart_config.enableHardwareFlowControl = false;
 	} else if (cfg->flow_ctrl == UART_CFG_FLOW_CTRL_RTS_CTS) {
 		usart_config.enableHardwareFlowControl = true;
 	} else {
 		return -ENOTSUP;
 	}

 	/* Wait for USART to finish transmission and turn off */
 	USART_Deinit(config->base);

 	/* Get UART clock frequency */
 	clock_control_get_rate(config->clock_dev,
 		config->clock_subsys, &clock_freq);

 	/* Handle 9 bit mode */
 	USART_Enable9bitMode(config->base, nine_bit_mode);

 	/* Reconfigure UART */
 	USART_Init(config->base, &usart_config, clock_freq);

 	/* Update driver device data */
 	uart_config->parity = cfg->parity;
 	uart_config->baudrate = cfg->baudrate;
 	uart_config->stop_bits = cfg->stop_bits;
 	uart_config->data_bits = cfg->data_bits;
 	uart_config->flow_ctrl = cfg->flow_ctrl;

 	return 0;
 }

 static int mcux_flexcomm_uart_config_get(const struct device *dev,
 					struct uart_config *cfg)
 {
 	struct mcux_flexcomm_data *data = dev->data;
 	*cfg = data->uart_config;
 	return 0;
 }
 #endif /* CONFIG_UART_USE_RUNTIME_CONFIGURE */

 static int mcux_flexcomm_init(const struct device *dev)
 {
 	const struct mcux_flexcomm_config *config = dev->config;
 #ifdef CONFIG_UART_USE_RUNTIME_CONFIGURE
 	struct mcux_flexcomm_data *data = dev->data;
 	struct uart_config *cfg = &data->uart_config;
 #endif /* CONFIG_UART_USE_RUNTIME_CONFIGURE */
 	usart_config_t usart_config;
 	usart_parity_mode_t parity_mode;
 	uint32_t clock_freq;
 	int err;

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

 	if (!device_is_ready(config->clock_dev)) {
 		return -ENODEV;
 	}

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

 	if (config->parity == UART_CFG_PARITY_ODD) {
 		parity_mode = kUSART_ParityOdd;
 	} else if (config->parity == UART_CFG_PARITY_EVEN) {
 		parity_mode = kUSART_ParityEven;
 	} else {
 		parity_mode = kUSART_ParityDisabled;
 	}

 	USART_GetDefaultConfig(&usart_config);
 	usart_config.enableTx = true;
 	usart_config.enableRx = true;
 	usart_config.parityMode = parity_mode;
 	usart_config.baudRate_Bps = config->baud_rate;

 #ifdef CONFIG_UART_USE_RUNTIME_CONFIGURE
 	cfg->baudrate = config->baud_rate;
 	cfg->parity = config->parity;
 	 /* From USART_GetDefaultConfig */
 	cfg->stop_bits = UART_CFG_STOP_BITS_1;
 	cfg->data_bits = UART_CFG_DATA_BITS_8;
 	cfg->flow_ctrl = UART_CFG_FLOW_CTRL_NONE;
 #endif /* CONFIG_UART_USE_RUNTIME_CONFIGURE */

 	USART_Init(config->base, &usart_config, clock_freq);

 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 	config->irq_config_func(dev);
 #endif

 	return 0;
 }

 static const struct uart_driver_api mcux_flexcomm_driver_api = {
 	.poll_in = mcux_flexcomm_poll_in,
 	.poll_out = mcux_flexcomm_poll_out,
 	.err_check = mcux_flexcomm_err_check,
 #ifdef CONFIG_UART_USE_RUNTIME_CONFIGURE
 	.configure = mcux_flexcomm_uart_configure,
 	.config_get = mcux_flexcomm_uart_config_get,
 #endif
 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 	.fifo_fill = mcux_flexcomm_fifo_fill,
 	.fifo_read = mcux_flexcomm_fifo_read,
 	.irq_tx_enable = mcux_flexcomm_irq_tx_enable,
 	.irq_tx_disable = mcux_flexcomm_irq_tx_disable,
 	.irq_tx_complete = mcux_flexcomm_irq_tx_complete,
 	.irq_tx_ready = mcux_flexcomm_irq_tx_ready,
 	.irq_rx_enable = mcux_flexcomm_irq_rx_enable,
 	.irq_rx_disable = mcux_flexcomm_irq_rx_disable,
 	.irq_rx_ready = mcux_flexcomm_irq_rx_full,
 	.irq_err_enable = mcux_flexcomm_irq_err_enable,
 	.irq_err_disable = mcux_flexcomm_irq_err_disable,
 	.irq_is_pending = mcux_flexcomm_irq_is_pending,
 	.irq_update = mcux_flexcomm_irq_update,
 	.irq_callback_set = mcux_flexcomm_irq_callback_set,
 #endif
 };


 #ifdef CONFIG_UART_INTERRUPT_DRIVEN
 #define UART_MCUX_FLEXCOMM_CONFIG_FUNC(n)				\
 	static void mcux_flexcomm_config_func_##n(const struct device *dev)	\
 	{								\
 		IRQ_CONNECT(DT_INST_IRQN(n),				\
 			    DT_INST_IRQ(n, priority),			\
 			    mcux_flexcomm_isr, DEVICE_DT_INST_GET(n), 0);\
 									\
 		irq_enable(DT_INST_IRQN(n));				\
 	}
 #define UART_MCUX_FLEXCOMM_IRQ_CFG_FUNC_INIT(n)				\
 	.irq_config_func = mcux_flexcomm_config_func_##n
 #define UART_MCUX_FLEXCOMM_INIT_CFG(n)					\
 	UART_MCUX_FLEXCOMM_DECLARE_CFG(n,				\
 				       UART_MCUX_FLEXCOMM_IRQ_CFG_FUNC_INIT(n))
 #else
 #define UART_MCUX_FLEXCOMM_CONFIG_FUNC(n)
 #define UART_MCUX_FLEXCOMM_IRQ_CFG_FUNC_INIT
 #define UART_MCUX_FLEXCOMM_INIT_CFG(n)					\
 	UART_MCUX_FLEXCOMM_DECLARE_CFG(n, UART_MCUX_FLEXCOMM_IRQ_CFG_FUNC_INIT)
 #endif

 #define UART_MCUX_FLEXCOMM_DECLARE_CFG(n, IRQ_FUNC_INIT)		\
 static const struct mcux_flexcomm_config mcux_flexcomm_##n##_config = {	\
 	.base = (USART_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),\
 	.baud_rate = DT_INST_PROP(n, current_speed),			\
 	.parity = DT_INST_ENUM_IDX_OR(n, parity, UART_CFG_PARITY_NONE), \
 	.pincfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n),			\
 	IRQ_FUNC_INIT							\
 }

 #define UART_MCUX_FLEXCOMM_INIT(n)					\
 									\
 	PINCTRL_DT_INST_DEFINE(n);					\
 									\
 	static struct mcux_flexcomm_data mcux_flexcomm_##n##_data;	\
 									\
 	static const struct mcux_flexcomm_config mcux_flexcomm_##n##_config;\
 									\
 	DEVICE_DT_INST_DEFINE(n,					\
 			    &mcux_flexcomm_init,			\
 			    NULL,					\
 			    &mcux_flexcomm_##n##_data,			\
 			    &mcux_flexcomm_##n##_config,		\
 			    PRE_KERNEL_1,				\
 			    CONFIG_SERIAL_INIT_PRIORITY,		\
 			    &mcux_flexcomm_driver_api);			\
 									\
 	UART_MCUX_FLEXCOMM_CONFIG_FUNC(n)				\
 									\
 	UART_MCUX_FLEXCOMM_INIT_CFG(n);

 DT_INST_FOREACH_STATUS_OKAY(UART_MCUX_FLEXCOMM_INIT)
	/*
	* Copyright (c) 2017, NXP
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#define DT_DRV_COMPAT nxp_lpc_usart

	/** @file
	* @brief USART driver for LPC54XXX and LPC55xxx families.
	*
	* Note:
	* - The driver is implemented for only one device, multiple instances
	* will be implemented in the future.
	*/

	#include <errno.h>
	#include <zephyr/device.h>
	#include <zephyr/drivers/uart.h>
	#include <zephyr/drivers/clock_control.h>
	#include <zephyr/irq.h>
	#include <fsl_usart.h>
	#include <soc.h>
	#include <fsl_device_registers.h>
	#include <zephyr/drivers/pinctrl.h>

	struct mcux_flexcomm_config {
	USART_Type *base;
	const struct device *clock_dev;
	clock_control_subsys_t clock_subsys;
	uint32_t baud_rate;
	uint8_t parity;
	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	void (irq_config_func)(const struct device dev);
	#endif
	const struct pinctrl_dev_config *pincfg;
	};

	struct mcux_flexcomm_data {
	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	uart_irq_callback_user_data_t callback;
	void *cb_data;
	#endif
	#ifdef CONFIG_UART_USE_RUNTIME_CONFIGURE
	struct uart_config uart_config;
	#endif
	};

	static int mcux_flexcomm_poll_in(const struct device dev, unsigned char c)
	{
	const struct mcux_flexcomm_config *config = dev->config;
	uint32_t flags = USART_GetStatusFlags(config->base);
	int ret = -1;

	if (flags & kUSART_RxFifoNotEmptyFlag) {
	*c = USART_ReadByte(config->base);
	ret = 0;
	}

	return ret;
	}

	static void mcux_flexcomm_poll_out(const struct device *dev,
	unsigned char c)
	{
	const struct mcux_flexcomm_config *config = dev->config;

	/* Wait until space is available in TX FIFO */
	while (!(USART_GetStatusFlags(config->base) & kUSART_TxFifoEmptyFlag)) {
	}

	USART_WriteByte(config->base, c);
	}

	static int mcux_flexcomm_err_check(const struct device *dev)
	{
	const struct mcux_flexcomm_config *config = dev->config;
	uint32_t flags = USART_GetStatusFlags(config->base);
	int err = 0;

	if (flags & kStatus_USART_RxRingBufferOverrun) {
	err \|= UART_ERROR_OVERRUN;
	}

	if (flags & kStatus_USART_ParityError) {
	err \|= UART_ERROR_PARITY;
	}

	if (flags & kStatus_USART_FramingError) {
	err \|= UART_ERROR_FRAMING;
	}

	USART_ClearStatusFlags(config->base,
	kStatus_USART_RxRingBufferOverrun \|
	kStatus_USART_ParityError \|
	kStatus_USART_FramingError);

	return err;
	}

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	static int mcux_flexcomm_fifo_fill(const struct device *dev,
	const uint8_t *tx_data,
	int len)
	{
	const struct mcux_flexcomm_config *config = dev->config;
	uint8_t num_tx = 0U;

	while ((len - num_tx > 0) &&
	(USART_GetStatusFlags(config->base)
	& kUSART_TxFifoNotFullFlag)) {

	USART_WriteByte(config->base, tx_data[num_tx++]);
	}

	return num_tx;
	}

	static int mcux_flexcomm_fifo_read(const struct device dev, uint8_t rx_data,
	const int len)
	{
	const struct mcux_flexcomm_config *config = dev->config;
	uint8_t num_rx = 0U;

	while ((len - num_rx > 0) &&
	(USART_GetStatusFlags(config->base)
	& kUSART_RxFifoNotEmptyFlag)) {

	rx_data[num_rx++] = USART_ReadByte(config->base);
	}

	return num_rx;
	}

	static void mcux_flexcomm_irq_tx_enable(const struct device *dev)
	{
	const struct mcux_flexcomm_config *config = dev->config;
	uint32_t mask = kUSART_TxLevelInterruptEnable;

	USART_EnableInterrupts(config->base, mask);
	}

	static void mcux_flexcomm_irq_tx_disable(const struct device *dev)
	{
	const struct mcux_flexcomm_config *config = dev->config;
	uint32_t mask = kUSART_TxLevelInterruptEnable;

	USART_DisableInterrupts(config->base, mask);
	}

	static int mcux_flexcomm_irq_tx_complete(const struct device *dev)
	{
	const struct mcux_flexcomm_config *config = dev->config;

	return (config->base->STAT & USART_STAT_TXIDLE_MASK) != 0;
	}

	static int mcux_flexcomm_irq_tx_ready(const struct device *dev)
	{
	const struct mcux_flexcomm_config *config = dev->config;
	uint32_t mask = kUSART_TxLevelInterruptEnable;
	uint32_t flags = USART_GetStatusFlags(config->base);

	return (USART_GetEnabledInterrupts(config->base) & mask)
	&& (flags & kUSART_TxFifoEmptyFlag);
	}

	static void mcux_flexcomm_irq_rx_enable(const struct device *dev)
	{
	const struct mcux_flexcomm_config *config = dev->config;
	uint32_t mask = kUSART_RxLevelInterruptEnable;

	USART_EnableInterrupts(config->base, mask);
	}

	static void mcux_flexcomm_irq_rx_disable(const struct device *dev)
	{
	const struct mcux_flexcomm_config *config = dev->config;
	uint32_t mask = kUSART_RxLevelInterruptEnable;

	USART_DisableInterrupts(config->base, mask);
	}

	static int mcux_flexcomm_irq_rx_full(const struct device *dev)
	{
	const struct mcux_flexcomm_config *config = dev->config;
	uint32_t flags = USART_GetStatusFlags(config->base);

	return (flags & kUSART_RxFifoNotEmptyFlag) != 0U;
	}

	static int mcux_flexcomm_irq_rx_pending(const struct device *dev)
	{
	const struct mcux_flexcomm_config *config = dev->config;
	uint32_t mask = kUSART_RxLevelInterruptEnable;

	return (USART_GetEnabledInterrupts(config->base) & mask)
	&& mcux_flexcomm_irq_rx_full(dev);
	}

	static void mcux_flexcomm_irq_err_enable(const struct device *dev)
	{
	const struct mcux_flexcomm_config *config = dev->config;
	uint32_t mask = kStatus_USART_NoiseError \|
	kStatus_USART_FramingError \|
	kStatus_USART_ParityError;

	USART_EnableInterrupts(config->base, mask);
	}

	static void mcux_flexcomm_irq_err_disable(const struct device *dev)
	{
	const struct mcux_flexcomm_config *config = dev->config;
	uint32_t mask = kStatus_USART_NoiseError \|
	kStatus_USART_FramingError \|
	kStatus_USART_ParityError;

	USART_DisableInterrupts(config->base, mask);
	}

	static int mcux_flexcomm_irq_is_pending(const struct device *dev)
	{
	return (mcux_flexcomm_irq_tx_ready(dev)
	\|\| mcux_flexcomm_irq_rx_pending(dev));
	}

	static int mcux_flexcomm_irq_update(const struct device *dev)
	{
	return 1;
	}

	static void mcux_flexcomm_irq_callback_set(const struct device *dev,
	uart_irq_callback_user_data_t cb,
	void *cb_data)
	{
	struct mcux_flexcomm_data *data = dev->data;

	data->callback = cb;
	data->cb_data = cb_data;
	}

	static void mcux_flexcomm_isr(const struct device *dev)
	{
	struct mcux_flexcomm_data *data = dev->data;

	if (data->callback) {
	data->callback(dev, data->cb_data);
	}
	}
	#endif /* CONFIG_UART_INTERRUPT_DRIVEN */

	#ifdef CONFIG_UART_USE_RUNTIME_CONFIGURE
	static int mcux_flexcomm_uart_configure(const struct device dev, const struct uart_config cfg)
	{
	const struct mcux_flexcomm_config *config = dev->config;
	struct mcux_flexcomm_data *data = dev->data;
	struct uart_config *uart_config = &data->uart_config;
	usart_config_t usart_config;
	usart_parity_mode_t parity_mode;
	usart_stop_bit_count_t stop_bits;
	usart_data_len_t data_bits = kUSART_8BitsPerChar;
	bool nine_bit_mode = false;
	uint32_t clock_freq;

	/* Set up structure to reconfigure UART */
	USART_GetDefaultConfig(&usart_config);

	/* Set parity */
	if (cfg->parity == UART_CFG_PARITY_ODD) {
	parity_mode = kUSART_ParityOdd;
	} else if (cfg->parity == UART_CFG_PARITY_EVEN) {
	parity_mode = kUSART_ParityEven;
	} else if (cfg->parity == UART_CFG_PARITY_NONE) {
	parity_mode = kUSART_ParityDisabled;
	} else {
	return -ENOTSUP;
	}
	usart_config.parityMode = parity_mode;

	/* Set baudrate */
	usart_config.baudRate_Bps = cfg->baudrate;

	/* Set stop bits */
	if (cfg->stop_bits == UART_CFG_STOP_BITS_1) {
	stop_bits = kUSART_OneStopBit;
	} else if (cfg->stop_bits == UART_CFG_STOP_BITS_2) {
	stop_bits = kUSART_TwoStopBit;
	} else {
	return -ENOTSUP;
	}
	usart_config.stopBitCount = stop_bits;

	/* Set data bits */
	if (cfg->data_bits == UART_CFG_DATA_BITS_5 \|\|
	cfg->data_bits == UART_CFG_DATA_BITS_6) {
	return -ENOTSUP;
	} else if (cfg->data_bits == UART_CFG_DATA_BITS_7) {
	data_bits = kUSART_7BitsPerChar;
	} else if (cfg->data_bits == UART_CFG_DATA_BITS_8) {
	data_bits = kUSART_8BitsPerChar;
	} else if (cfg->data_bits == UART_CFG_DATA_BITS_9) {
	nine_bit_mode = true;
	} else {
	return -EINVAL;
	}
	usart_config.bitCountPerChar = data_bits;

	/* Set flow control */
	if (cfg->flow_ctrl == UART_CFG_FLOW_CTRL_NONE) {
	usart_config.enableHardwareFlowControl = false;
	} else if (cfg->flow_ctrl == UART_CFG_FLOW_CTRL_RTS_CTS) {
	usart_config.enableHardwareFlowControl = true;
	} else {
	return -ENOTSUP;
	}

	/* Wait for USART to finish transmission and turn off */
	USART_Deinit(config->base);

	/* Get UART clock frequency */
	clock_control_get_rate(config->clock_dev,
	config->clock_subsys, &clock_freq);

	/* Handle 9 bit mode */
	USART_Enable9bitMode(config->base, nine_bit_mode);

	/* Reconfigure UART */
	USART_Init(config->base, &usart_config, clock_freq);

	/* Update driver device data */
	uart_config->parity = cfg->parity;
	uart_config->baudrate = cfg->baudrate;
	uart_config->stop_bits = cfg->stop_bits;
	uart_config->data_bits = cfg->data_bits;
	uart_config->flow_ctrl = cfg->flow_ctrl;

	return 0;
	}

	static int mcux_flexcomm_uart_config_get(const struct device *dev,
	struct uart_config *cfg)
	{
	struct mcux_flexcomm_data *data = dev->data;
	*cfg = data->uart_config;
	return 0;
	}
	#endif /* CONFIG_UART_USE_RUNTIME_CONFIGURE */

	static int mcux_flexcomm_init(const struct device *dev)
	{
	const struct mcux_flexcomm_config *config = dev->config;
	#ifdef CONFIG_UART_USE_RUNTIME_CONFIGURE
	struct mcux_flexcomm_data *data = dev->data;
	struct uart_config *cfg = &data->uart_config;
	#endif /* CONFIG_UART_USE_RUNTIME_CONFIGURE */
	usart_config_t usart_config;
	usart_parity_mode_t parity_mode;
	uint32_t clock_freq;
	int err;

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

	if (!device_is_ready(config->clock_dev)) {
	return -ENODEV;
	}

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

	if (config->parity == UART_CFG_PARITY_ODD) {
	parity_mode = kUSART_ParityOdd;
	} else if (config->parity == UART_CFG_PARITY_EVEN) {
	parity_mode = kUSART_ParityEven;
	} else {
	parity_mode = kUSART_ParityDisabled;
	}

	USART_GetDefaultConfig(&usart_config);
	usart_config.enableTx = true;
	usart_config.enableRx = true;
	usart_config.parityMode = parity_mode;
	usart_config.baudRate_Bps = config->baud_rate;

	#ifdef CONFIG_UART_USE_RUNTIME_CONFIGURE
	cfg->baudrate = config->baud_rate;
	cfg->parity = config->parity;
	/* From USART_GetDefaultConfig */
	cfg->stop_bits = UART_CFG_STOP_BITS_1;
	cfg->data_bits = UART_CFG_DATA_BITS_8;
	cfg->flow_ctrl = UART_CFG_FLOW_CTRL_NONE;
	#endif /* CONFIG_UART_USE_RUNTIME_CONFIGURE */

	USART_Init(config->base, &usart_config, clock_freq);

	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	config->irq_config_func(dev);
	#endif

	return 0;
	}

	static const struct uart_driver_api mcux_flexcomm_driver_api = {
	.poll_in = mcux_flexcomm_poll_in,
	.poll_out = mcux_flexcomm_poll_out,
	.err_check = mcux_flexcomm_err_check,
	#ifdef CONFIG_UART_USE_RUNTIME_CONFIGURE
	.configure = mcux_flexcomm_uart_configure,
	.config_get = mcux_flexcomm_uart_config_get,
	#endif
	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	.fifo_fill = mcux_flexcomm_fifo_fill,
	.fifo_read = mcux_flexcomm_fifo_read,
	.irq_tx_enable = mcux_flexcomm_irq_tx_enable,
	.irq_tx_disable = mcux_flexcomm_irq_tx_disable,
	.irq_tx_complete = mcux_flexcomm_irq_tx_complete,
	.irq_tx_ready = mcux_flexcomm_irq_tx_ready,
	.irq_rx_enable = mcux_flexcomm_irq_rx_enable,
	.irq_rx_disable = mcux_flexcomm_irq_rx_disable,
	.irq_rx_ready = mcux_flexcomm_irq_rx_full,
	.irq_err_enable = mcux_flexcomm_irq_err_enable,
	.irq_err_disable = mcux_flexcomm_irq_err_disable,
	.irq_is_pending = mcux_flexcomm_irq_is_pending,
	.irq_update = mcux_flexcomm_irq_update,
	.irq_callback_set = mcux_flexcomm_irq_callback_set,
	#endif
	};


	#ifdef CONFIG_UART_INTERRUPT_DRIVEN
	#define UART_MCUX_FLEXCOMM_CONFIG_FUNC(n) \
	static void mcux_flexcomm_config_func_##n(const struct device *dev) \
	{ \
	IRQ_CONNECT(DT_INST_IRQN(n), \
	DT_INST_IRQ(n, priority), \
	mcux_flexcomm_isr, DEVICE_DT_INST_GET(n), 0);\
	\
	irq_enable(DT_INST_IRQN(n)); \
	}
	#define UART_MCUX_FLEXCOMM_IRQ_CFG_FUNC_INIT(n) \
	.irq_config_func = mcux_flexcomm_config_func_##n
	#define UART_MCUX_FLEXCOMM_INIT_CFG(n) \
	UART_MCUX_FLEXCOMM_DECLARE_CFG(n, \
	UART_MCUX_FLEXCOMM_IRQ_CFG_FUNC_INIT(n))
	#else
	#define UART_MCUX_FLEXCOMM_CONFIG_FUNC(n)
	#define UART_MCUX_FLEXCOMM_IRQ_CFG_FUNC_INIT
	#define UART_MCUX_FLEXCOMM_INIT_CFG(n) \
	UART_MCUX_FLEXCOMM_DECLARE_CFG(n, UART_MCUX_FLEXCOMM_IRQ_CFG_FUNC_INIT)
	#endif

	#define UART_MCUX_FLEXCOMM_DECLARE_CFG(n, IRQ_FUNC_INIT) \
	static const struct mcux_flexcomm_config mcux_flexcomm_##n##_config = { \
	.base = (USART_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),\
	.baud_rate = DT_INST_PROP(n, current_speed), \
	.parity = DT_INST_ENUM_IDX_OR(n, parity, UART_CFG_PARITY_NONE), \
	.pincfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n), \
	IRQ_FUNC_INIT \
	}

	#define UART_MCUX_FLEXCOMM_INIT(n) \
	\
	PINCTRL_DT_INST_DEFINE(n); \
	\
	static struct mcux_flexcomm_data mcux_flexcomm_##n##_data; \
	\
	static const struct mcux_flexcomm_config mcux_flexcomm_##n##_config;\
	\
	DEVICE_DT_INST_DEFINE(n, \
	&mcux_flexcomm_init, \
	NULL, \
	&mcux_flexcomm_##n##_data, \
	&mcux_flexcomm_##n##_config, \
	PRE_KERNEL_1, \
	CONFIG_SERIAL_INIT_PRIORITY, \
	&mcux_flexcomm_driver_api); \
	\
	UART_MCUX_FLEXCOMM_CONFIG_FUNC(n) \
	\
	UART_MCUX_FLEXCOMM_INIT_CFG(n);

	DT_INST_FOREACH_STATUS_OKAY(UART_MCUX_FLEXCOMM_INIT)