drivers/i2c/i2c_sam_twihs.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /*
  * Copyright (c) 2017 Piotr Mienkowski
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #define DT_DRV_COMPAT atmel_sam_i2c_twihs

 /** @file
  * @brief I2C bus (TWIHS) driver for Atmel SAM MCU family.
  *
  * Only I2C Master Mode with 7 bit addressing is currently supported.
  */


 #include <errno.h>
 #include <zephyr/sys/__assert.h>
 #include <zephyr/kernel.h>
 #include <zephyr/device.h>
 #include <zephyr/init.h>
 #include <soc.h>
 #include <zephyr/drivers/i2c.h>
 #include <zephyr/drivers/pinctrl.h>

 #define LOG_LEVEL CONFIG_I2C_LOG_LEVEL
 #include <zephyr/logging/log.h>
 LOG_MODULE_REGISTER(i2c_sam_twihs);

 #include "i2c-priv.h"

 /** I2C bus speed [Hz] in Standard Mode */
 #define BUS_SPEED_STANDARD_HZ         100000U
 /** I2C bus speed [Hz] in Fast Mode */
 #define BUS_SPEED_FAST_HZ             400000U
 /** I2C bus speed [Hz] in High Speed Mode */
 #define BUS_SPEED_HIGH_HZ            3400000U
 /* Maximum value of Clock Divider (CKDIV) */
 #define CKDIV_MAX                          7

 /* Device constant configuration parameters */
 struct i2c_sam_twihs_dev_cfg {
 	Twihs *regs;
 	void (*irq_config)(void);
 	uint32_t bitrate;
 	const struct pinctrl_dev_config *pcfg;
 	uint8_t periph_id;
 	uint8_t irq_id;
 };

 struct twihs_msg {
 	/* Buffer containing data to read or write */
 	uint8_t *buf;
 	/* Length of the buffer */
 	uint32_t len;
 	/* Index of the next byte to be read/written from/to the buffer */
 	uint32_t idx;
 	/* Value of TWIHS_SR at the end of the message */
 	uint32_t twihs_sr;
 	/* Transfer flags as defined in the i2c.h file */
 	uint8_t flags;
 };

 /* Device run time data */
 struct i2c_sam_twihs_dev_data {
 	struct k_sem sem;
 	struct twihs_msg msg;
 };

 static int i2c_clk_set(Twihs *const twihs, uint32_t speed)
 {
 	uint32_t ck_div = 0U;
 	uint32_t cl_div;
 	bool div_completed = false;

 	/*  From the datasheet "TWIHS Clock Waveform Generator Register"
 	 *  T_low = ( ( CLDIV × 2^CKDIV ) + 3 ) × T_MCK
 	 */
 	while (!div_completed) {
 		cl_div =   ((SOC_ATMEL_SAM_MCK_FREQ_HZ / (speed * 2U)) - 3)
 			 / (1 << ck_div);

 		if (cl_div <= 255U) {
 			div_completed = true;
 		} else {
 			ck_div++;
 		}
 	}

 	if (ck_div > CKDIV_MAX) {
 		LOG_ERR("Failed to configure I2C clock");
 		return -EIO;
 	}

 	/* Set I2C bus clock duty cycle to 50% */
 	twihs->TWIHS_CWGR = TWIHS_CWGR_CLDIV(cl_div) | TWIHS_CWGR_CHDIV(cl_div)
 			    | TWIHS_CWGR_CKDIV(ck_div);

 	return 0;
 }

 static int i2c_sam_twihs_configure(const struct device *dev, uint32_t config)
 {
 	const struct i2c_sam_twihs_dev_cfg *const dev_cfg = dev->config;
 	Twihs *const twihs = dev_cfg->regs;
 	uint32_t bitrate;
 	int ret;

 	if (!(config & I2C_MODE_CONTROLLER)) {
 		LOG_ERR("Master Mode is not enabled");
 		return -EIO;
 	}

 	if (config & I2C_ADDR_10_BITS) {
 		LOG_ERR("I2C 10-bit addressing is currently not supported");
 		LOG_ERR("Please submit a patch");
 		return -EIO;
 	}

 	/* Configure clock */
 	switch (I2C_SPEED_GET(config)) {
 	case I2C_SPEED_STANDARD:
 		bitrate = BUS_SPEED_STANDARD_HZ;
 		break;
 	case I2C_SPEED_FAST:
 		bitrate = BUS_SPEED_FAST_HZ;
 		break;
 	default:
 		LOG_ERR("Unsupported I2C speed value");
 		return -EIO;
 	}

 	/* Setup clock waveform */
 	ret = i2c_clk_set(twihs, bitrate);
 	if (ret < 0) {
 		return ret;
 	}

 	/* Disable Slave Mode */
 	twihs->TWIHS_CR = TWIHS_CR_SVDIS;

 	/* Enable Master Mode */
 	twihs->TWIHS_CR = TWIHS_CR_MSEN;

 	return 0;
 }

 static void write_msg_start(Twihs *const twihs, struct twihs_msg *msg,
 			    uint8_t daddr)
 {
 	/* Set slave address. */
 	twihs->TWIHS_MMR = TWIHS_MMR_DADR(daddr);

 	/* Write first data byte on I2C bus */
 	twihs->TWIHS_THR = msg->buf[msg->idx++];

 	/* Enable Transmit Ready and Transmission Completed interrupts */
 	twihs->TWIHS_IER = TWIHS_IER_TXRDY | TWIHS_IER_TXCOMP | TWIHS_IER_NACK;
 }

 static void read_msg_start(Twihs *const twihs, struct twihs_msg *msg,
 			   uint8_t daddr)
 {
 	uint32_t twihs_cr_stop;

 	/* Set slave address and number of internal address bytes */
 	twihs->TWIHS_MMR = TWIHS_MMR_MREAD | TWIHS_MMR_DADR(daddr);

 	/* Enable Receive Ready and Transmission Completed interrupts */
 	twihs->TWIHS_IER = TWIHS_IER_RXRDY | TWIHS_IER_TXCOMP | TWIHS_IER_NACK;

 	/* In single data byte read the START and STOP must both be set */
 	twihs_cr_stop = (msg->len == 1U) ? TWIHS_CR_STOP : 0;
 	/* Start the transfer by sending START condition */
 	twihs->TWIHS_CR = TWIHS_CR_START | twihs_cr_stop;
 }

 static int i2c_sam_twihs_transfer(const struct device *dev,
 				  struct i2c_msg *msgs,
 				  uint8_t num_msgs, uint16_t addr)
 {
 	const struct i2c_sam_twihs_dev_cfg *const dev_cfg = dev->config;
 	struct i2c_sam_twihs_dev_data *const dev_data = dev->data;
 	Twihs *const twihs = dev_cfg->regs;

 	__ASSERT_NO_MSG(msgs);
 	if (!num_msgs) {
 		return 0;
 	}

 	/* Clear pending interrupts, such as NACK. */
 	(void)twihs->TWIHS_SR;

 	/* Set number of internal address bytes to 0, not used. */
 	twihs->TWIHS_IADR = 0;

 	for (int i = 0; i < num_msgs; i++) {
 		dev_data->msg.buf = msgs[i].buf;
 		dev_data->msg.len = msgs[i].len;
 		dev_data->msg.idx = 0U;
 		dev_data->msg.twihs_sr = 0U;
 		dev_data->msg.flags = msgs[i].flags;
 		if ((msgs[i].flags & I2C_MSG_RW_MASK) == I2C_MSG_READ) {
 			read_msg_start(twihs, &dev_data->msg, addr);
 		} else {
 			write_msg_start(twihs, &dev_data->msg, addr);
 		}
 		/* Wait for the transfer to complete */
 		k_sem_take(&dev_data->sem, K_FOREVER);

 		if (dev_data->msg.twihs_sr > 0) {
 			/* Something went wrong */
 			return -EIO;
 		}
 	}

 	return 0;
 }

 static void i2c_sam_twihs_isr(const struct device *dev)
 {
 	const struct i2c_sam_twihs_dev_cfg *const dev_cfg = dev->config;
 	struct i2c_sam_twihs_dev_data *const dev_data = dev->data;
 	Twihs *const twihs = dev_cfg->regs;
 	struct twihs_msg *msg = &dev_data->msg;
 	uint32_t isr_status;

 	/* Retrieve interrupt status */
 	isr_status = twihs->TWIHS_SR & twihs->TWIHS_IMR;

 	/* Not Acknowledged */
 	if (isr_status & TWIHS_SR_NACK) {
 		msg->twihs_sr = isr_status;
 		goto tx_comp;
 	}

 	/* Byte received */
 	if (isr_status & TWIHS_SR_RXRDY) {

 		msg->buf[msg->idx++] = twihs->TWIHS_RHR;

 		if (msg->idx == msg->len - 1U) {
 			/* Send STOP condition */
 			twihs->TWIHS_CR = TWIHS_CR_STOP;
 		}
 	}

 	/* Byte sent */
 	if (isr_status & TWIHS_SR_TXRDY) {
 		if (msg->idx == msg->len) {
 			if (msg->flags & I2C_MSG_STOP) {
 				/* Send STOP condition */
 				twihs->TWIHS_CR = TWIHS_CR_STOP;
 				/* Disable Transmit Ready interrupt */
 				twihs->TWIHS_IDR = TWIHS_IDR_TXRDY;
 			} else {
 				/* Transmission completed */
 				goto tx_comp;
 			}
 		} else {
 			twihs->TWIHS_THR = msg->buf[msg->idx++];
 		}
 	}

 	/* Transmission completed */
 	if (isr_status & TWIHS_SR_TXCOMP) {
 		goto tx_comp;
 	}

 	return;

 tx_comp:
 	/* Disable all enabled interrupts */
 	twihs->TWIHS_IDR = twihs->TWIHS_IMR;
 	/* We are done */
 	k_sem_give(&dev_data->sem);
 }

 static int i2c_sam_twihs_initialize(const struct device *dev)
 {
 	const struct i2c_sam_twihs_dev_cfg *const dev_cfg = dev->config;
 	struct i2c_sam_twihs_dev_data *const dev_data = dev->data;
 	Twihs *const twihs = dev_cfg->regs;
 	uint32_t bitrate_cfg;
 	int ret;

 	/* Configure interrupts */
 	dev_cfg->irq_config();

 	/* Initialize semaphore */
 	k_sem_init(&dev_data->sem, 0, 1);

 	/* Connect pins to the peripheral */
 	ret = pinctrl_apply_state(dev_cfg->pcfg, PINCTRL_STATE_DEFAULT);
 	if (ret < 0) {
 		return ret;
 	}

 	/* Enable module's clock */
 	soc_pmc_peripheral_enable(dev_cfg->periph_id);

 	/* Reset the module */
 	twihs->TWIHS_CR = TWIHS_CR_SWRST;

 	bitrate_cfg = i2c_map_dt_bitrate(dev_cfg->bitrate);

 	ret = i2c_sam_twihs_configure(dev, I2C_MODE_CONTROLLER | bitrate_cfg);
 	if (ret < 0) {
 		LOG_ERR("Failed to initialize %s device", dev->name);
 		return ret;
 	}

 	/* Enable module's IRQ */
 	irq_enable(dev_cfg->irq_id);

 	LOG_INF("Device %s initialized", dev->name);

 	return 0;
 }

 static const struct i2c_driver_api i2c_sam_twihs_driver_api = {
 	.configure = i2c_sam_twihs_configure,
 	.transfer = i2c_sam_twihs_transfer,
 };

 #define I2C_TWIHS_SAM_INIT(n)						\
 	PINCTRL_DT_INST_DEFINE(n);					\
 	static void i2c##n##_sam_irq_config(void)			\
 	{								\
 		IRQ_CONNECT(DT_INST_IRQN(n), DT_INST_IRQ(n, priority),	\
 			    i2c_sam_twihs_isr,				\
 			    DEVICE_DT_INST_GET(n), 0);			\
 	}								\
 									\
 	static const struct i2c_sam_twihs_dev_cfg i2c##n##_sam_config = {\
 		.regs = (Twihs *)DT_INST_REG_ADDR(n),			\
 		.irq_config = i2c##n##_sam_irq_config,			\
 		.periph_id = DT_INST_PROP(n, peripheral_id),		\
 		.irq_id = DT_INST_IRQN(n),				\
 		.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n),		\
 		.bitrate = DT_INST_PROP(n, clock_frequency),		\
 	};								\
 									\
 	static struct i2c_sam_twihs_dev_data i2c##n##_sam_data;		\
 									\
 	I2C_DEVICE_DT_INST_DEFINE(n, i2c_sam_twihs_initialize,	\
 			    NULL,					\
 			    &i2c##n##_sam_data, &i2c##n##_sam_config,	\
 			    POST_KERNEL, CONFIG_I2C_INIT_PRIORITY,	\
 			    &i2c_sam_twihs_driver_api);

 DT_INST_FOREACH_STATUS_OKAY(I2C_TWIHS_SAM_INIT)
	/*
	* Copyright (c) 2017 Piotr Mienkowski
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#define DT_DRV_COMPAT atmel_sam_i2c_twihs

	/** @file
	* @brief I2C bus (TWIHS) driver for Atmel SAM MCU family.
	*
	* Only I2C Master Mode with 7 bit addressing is currently supported.
	*/


	#include <errno.h>
	#include <zephyr/sys/__assert.h>
	#include <zephyr/kernel.h>
	#include <zephyr/device.h>
	#include <zephyr/init.h>
	#include <soc.h>
	#include <zephyr/drivers/i2c.h>
	#include <zephyr/drivers/pinctrl.h>

	#define LOG_LEVEL CONFIG_I2C_LOG_LEVEL
	#include <zephyr/logging/log.h>
	LOG_MODULE_REGISTER(i2c_sam_twihs);

	#include "i2c-priv.h"

	/** I2C bus speed [Hz] in Standard Mode */
	#define BUS_SPEED_STANDARD_HZ 100000U
	/** I2C bus speed [Hz] in Fast Mode */
	#define BUS_SPEED_FAST_HZ 400000U
	/** I2C bus speed [Hz] in High Speed Mode */
	#define BUS_SPEED_HIGH_HZ 3400000U
	/* Maximum value of Clock Divider (CKDIV) */
	#define CKDIV_MAX 7

	/* Device constant configuration parameters */
	struct i2c_sam_twihs_dev_cfg {
	Twihs *regs;
	void (*irq_config)(void);
	uint32_t bitrate;
	const struct pinctrl_dev_config *pcfg;
	uint8_t periph_id;
	uint8_t irq_id;
	};

	struct twihs_msg {
	/* Buffer containing data to read or write */
	uint8_t *buf;
	/* Length of the buffer */
	uint32_t len;
	/* Index of the next byte to be read/written from/to the buffer */
	uint32_t idx;
	/* Value of TWIHS_SR at the end of the message */
	uint32_t twihs_sr;
	/* Transfer flags as defined in the i2c.h file */
	uint8_t flags;
	};

	/* Device run time data */
	struct i2c_sam_twihs_dev_data {
	struct k_sem sem;
	struct twihs_msg msg;
	};

	static int i2c_clk_set(Twihs *const twihs, uint32_t speed)
	{
	uint32_t ck_div = 0U;
	uint32_t cl_div;
	bool div_completed = false;

	/* From the datasheet "TWIHS Clock Waveform Generator Register"
	* T_low = ( ( CLDIV × 2^CKDIV ) + 3 ) × T_MCK
	*/
	while (!div_completed) {
	cl_div = ((SOC_ATMEL_SAM_MCK_FREQ_HZ / (speed * 2U)) - 3)
	/ (1 << ck_div);

	if (cl_div <= 255U) {
	div_completed = true;
	} else {
	ck_div++;
	}
	}

	if (ck_div > CKDIV_MAX) {
	LOG_ERR("Failed to configure I2C clock");
	return -EIO;
	}

	/* Set I2C bus clock duty cycle to 50% */
	twihs->TWIHS_CWGR = TWIHS_CWGR_CLDIV(cl_div) \| TWIHS_CWGR_CHDIV(cl_div)
	\| TWIHS_CWGR_CKDIV(ck_div);

	return 0;
	}

	static int i2c_sam_twihs_configure(const struct device *dev, uint32_t config)
	{
	const struct i2c_sam_twihs_dev_cfg *const dev_cfg = dev->config;
	Twihs *const twihs = dev_cfg->regs;
	uint32_t bitrate;
	int ret;

	if (!(config & I2C_MODE_CONTROLLER)) {
	LOG_ERR("Master Mode is not enabled");
	return -EIO;
	}

	if (config & I2C_ADDR_10_BITS) {
	LOG_ERR("I2C 10-bit addressing is currently not supported");
	LOG_ERR("Please submit a patch");
	return -EIO;
	}

	/* Configure clock */
	switch (I2C_SPEED_GET(config)) {
	case I2C_SPEED_STANDARD:
	bitrate = BUS_SPEED_STANDARD_HZ;
	break;
	case I2C_SPEED_FAST:
	bitrate = BUS_SPEED_FAST_HZ;
	break;
	default:
	LOG_ERR("Unsupported I2C speed value");
	return -EIO;
	}

	/* Setup clock waveform */
	ret = i2c_clk_set(twihs, bitrate);
	if (ret < 0) {
	return ret;
	}

	/* Disable Slave Mode */
	twihs->TWIHS_CR = TWIHS_CR_SVDIS;

	/* Enable Master Mode */
	twihs->TWIHS_CR = TWIHS_CR_MSEN;

	return 0;
	}

	static void write_msg_start(Twihs const twihs, struct twihs_msg msg,
	uint8_t daddr)
	{
	/* Set slave address. */
	twihs->TWIHS_MMR = TWIHS_MMR_DADR(daddr);

	/* Write first data byte on I2C bus */
	twihs->TWIHS_THR = msg->buf[msg->idx++];

	/* Enable Transmit Ready and Transmission Completed interrupts */
	twihs->TWIHS_IER = TWIHS_IER_TXRDY \| TWIHS_IER_TXCOMP \| TWIHS_IER_NACK;
	}

	static void read_msg_start(Twihs const twihs, struct twihs_msg msg,
	uint8_t daddr)
	{
	uint32_t twihs_cr_stop;

	/* Set slave address and number of internal address bytes */
	twihs->TWIHS_MMR = TWIHS_MMR_MREAD \| TWIHS_MMR_DADR(daddr);

	/* Enable Receive Ready and Transmission Completed interrupts */
	twihs->TWIHS_IER = TWIHS_IER_RXRDY \| TWIHS_IER_TXCOMP \| TWIHS_IER_NACK;

	/* In single data byte read the START and STOP must both be set */
	twihs_cr_stop = (msg->len == 1U) ? TWIHS_CR_STOP : 0;
	/* Start the transfer by sending START condition */
	twihs->TWIHS_CR = TWIHS_CR_START \| twihs_cr_stop;
	}

	static int i2c_sam_twihs_transfer(const struct device *dev,
	struct i2c_msg *msgs,
	uint8_t num_msgs, uint16_t addr)
	{
	const struct i2c_sam_twihs_dev_cfg *const dev_cfg = dev->config;
	struct i2c_sam_twihs_dev_data *const dev_data = dev->data;
	Twihs *const twihs = dev_cfg->regs;

	__ASSERT_NO_MSG(msgs);
	if (!num_msgs) {
	return 0;
	}

	/* Clear pending interrupts, such as NACK. */
	(void)twihs->TWIHS_SR;

	/* Set number of internal address bytes to 0, not used. */
	twihs->TWIHS_IADR = 0;

	for (int i = 0; i < num_msgs; i++) {
	dev_data->msg.buf = msgs[i].buf;
	dev_data->msg.len = msgs[i].len;
	dev_data->msg.idx = 0U;
	dev_data->msg.twihs_sr = 0U;
	dev_data->msg.flags = msgs[i].flags;
	if ((msgs[i].flags & I2C_MSG_RW_MASK) == I2C_MSG_READ) {
	read_msg_start(twihs, &dev_data->msg, addr);
	} else {
	write_msg_start(twihs, &dev_data->msg, addr);
	}
	/* Wait for the transfer to complete */
	k_sem_take(&dev_data->sem, K_FOREVER);

	if (dev_data->msg.twihs_sr > 0) {
	/* Something went wrong */
	return -EIO;
	}
	}

	return 0;
	}

	static void i2c_sam_twihs_isr(const struct device *dev)
	{
	const struct i2c_sam_twihs_dev_cfg *const dev_cfg = dev->config;
	struct i2c_sam_twihs_dev_data *const dev_data = dev->data;
	Twihs *const twihs = dev_cfg->regs;
	struct twihs_msg *msg = &dev_data->msg;
	uint32_t isr_status;

	/* Retrieve interrupt status */
	isr_status = twihs->TWIHS_SR & twihs->TWIHS_IMR;

	/* Not Acknowledged */
	if (isr_status & TWIHS_SR_NACK) {
	msg->twihs_sr = isr_status;
	goto tx_comp;
	}

	/* Byte received */
	if (isr_status & TWIHS_SR_RXRDY) {

	msg->buf[msg->idx++] = twihs->TWIHS_RHR;

	if (msg->idx == msg->len - 1U) {
	/* Send STOP condition */
	twihs->TWIHS_CR = TWIHS_CR_STOP;
	}
	}

	/* Byte sent */
	if (isr_status & TWIHS_SR_TXRDY) {
	if (msg->idx == msg->len) {
	if (msg->flags & I2C_MSG_STOP) {
	/* Send STOP condition */
	twihs->TWIHS_CR = TWIHS_CR_STOP;
	/* Disable Transmit Ready interrupt */
	twihs->TWIHS_IDR = TWIHS_IDR_TXRDY;
	} else {
	/* Transmission completed */
	goto tx_comp;
	}
	} else {
	twihs->TWIHS_THR = msg->buf[msg->idx++];
	}
	}

	/* Transmission completed */
	if (isr_status & TWIHS_SR_TXCOMP) {
	goto tx_comp;
	}

	return;

	tx_comp:
	/* Disable all enabled interrupts */
	twihs->TWIHS_IDR = twihs->TWIHS_IMR;
	/* We are done */
	k_sem_give(&dev_data->sem);
	}

	static int i2c_sam_twihs_initialize(const struct device *dev)
	{
	const struct i2c_sam_twihs_dev_cfg *const dev_cfg = dev->config;
	struct i2c_sam_twihs_dev_data *const dev_data = dev->data;
	Twihs *const twihs = dev_cfg->regs;
	uint32_t bitrate_cfg;
	int ret;

	/* Configure interrupts */
	dev_cfg->irq_config();

	/* Initialize semaphore */
	k_sem_init(&dev_data->sem, 0, 1);

	/* Connect pins to the peripheral */
	ret = pinctrl_apply_state(dev_cfg->pcfg, PINCTRL_STATE_DEFAULT);
	if (ret < 0) {
	return ret;
	}

	/* Enable module's clock */
	soc_pmc_peripheral_enable(dev_cfg->periph_id);

	/* Reset the module */
	twihs->TWIHS_CR = TWIHS_CR_SWRST;

	bitrate_cfg = i2c_map_dt_bitrate(dev_cfg->bitrate);

	ret = i2c_sam_twihs_configure(dev, I2C_MODE_CONTROLLER \| bitrate_cfg);
	if (ret < 0) {
	LOG_ERR("Failed to initialize %s device", dev->name);
	return ret;
	}

	/* Enable module's IRQ */
	irq_enable(dev_cfg->irq_id);

	LOG_INF("Device %s initialized", dev->name);

	return 0;
	}

	static const struct i2c_driver_api i2c_sam_twihs_driver_api = {
	.configure = i2c_sam_twihs_configure,
	.transfer = i2c_sam_twihs_transfer,
	};

	#define I2C_TWIHS_SAM_INIT(n) \
	PINCTRL_DT_INST_DEFINE(n); \
	static void i2c##n##_sam_irq_config(void) \
	{ \
	IRQ_CONNECT(DT_INST_IRQN(n), DT_INST_IRQ(n, priority), \
	i2c_sam_twihs_isr, \
	DEVICE_DT_INST_GET(n), 0); \
	} \
	\
	static const struct i2c_sam_twihs_dev_cfg i2c##n##_sam_config = {\
	.regs = (Twihs *)DT_INST_REG_ADDR(n), \
	.irq_config = i2c##n##_sam_irq_config, \
	.periph_id = DT_INST_PROP(n, peripheral_id), \
	.irq_id = DT_INST_IRQN(n), \
	.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n), \
	.bitrate = DT_INST_PROP(n, clock_frequency), \
	}; \
	\
	static struct i2c_sam_twihs_dev_data i2c##n##_sam_data; \
	\
	I2C_DEVICE_DT_INST_DEFINE(n, i2c_sam_twihs_initialize, \
	NULL, \
	&i2c##n##_sam_data, &i2c##n##_sam_config, \
	POST_KERNEL, CONFIG_I2C_INIT_PRIORITY, \
	&i2c_sam_twihs_driver_api);

	DT_INST_FOREACH_STATUS_OKAY(I2C_TWIHS_SAM_INIT)