drivers/display/display_st7789v.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /*
  * Copyright (c) 2017 Jan Van Winkel <jan.van_winkel@dxplore.eu>
  * Copyright (c) 2019 Nordic Semiconductor ASA
  * Copyright (c) 2019 Marc Reilly
  * Copyright (c) 2019 PHYTEC Messtechnik GmbH
  * Copyright (c) 2020 Endian Technologies AB
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #define DT_DRV_COMPAT sitronix_st7789v

 #include "display_st7789v.h"

 #include <zephyr/device.h>
 #include <zephyr/drivers/spi.h>
 #include <zephyr/drivers/gpio.h>
 #include <zephyr/pm/device.h>
 #include <zephyr/sys/byteorder.h>
 #include <zephyr/drivers/display.h>

 #define LOG_LEVEL CONFIG_DISPLAY_LOG_LEVEL
 #include <zephyr/logging/log.h>
 LOG_MODULE_REGISTER(display_st7789v);

 struct st7789v_config {
 	struct spi_dt_spec bus;
 	struct gpio_dt_spec cmd_data_gpio;
 	struct gpio_dt_spec reset_gpio;
 	uint8_t vcom;
 	uint8_t gctrl;
 	bool vdv_vrh_enable;
 	uint8_t vrh_value;
 	uint8_t vdv_value;
 	uint8_t mdac;
 	uint8_t gamma;
 	uint8_t colmod;
 	uint8_t lcm;
 	uint8_t porch_param[5];
 	uint8_t cmd2en_param[4];
 	uint8_t pwctrl1_param[2];
 	uint8_t pvgam_param[14];
 	uint8_t nvgam_param[14];
 	uint8_t ram_param[2];
 	uint8_t rgb_param[3];
 	uint16_t height;
 	uint16_t width;
 };

 struct st7789v_data {
 	uint16_t x_offset;
 	uint16_t y_offset;
 };

 #ifdef CONFIG_ST7789V_RGB565
 #define ST7789V_PIXEL_SIZE 2u
 #else
 #define ST7789V_PIXEL_SIZE 3u
 #endif

 static void st7789v_set_lcd_margins(const struct device *dev,
 				    uint16_t x_offset, uint16_t y_offset)
 {
 	struct st7789v_data *data = dev->data;

 	data->x_offset = x_offset;
 	data->y_offset = y_offset;
 }

 static void st7789v_set_cmd(const struct device *dev, int is_cmd)
 {
 	const struct st7789v_config *config = dev->config;

 	gpio_pin_set_dt(&config->cmd_data_gpio, is_cmd);
 }

 static void st7789v_transmit(const struct device *dev, uint8_t cmd,
 			     uint8_t *tx_data, size_t tx_count)
 {
 	const struct st7789v_config *config = dev->config;

 	struct spi_buf tx_buf = { .buf = &cmd, .len = 1 };
 	struct spi_buf_set tx_bufs = { .buffers = &tx_buf, .count = 1 };

 	st7789v_set_cmd(dev, 1);
 	spi_write_dt(&config->bus, &tx_bufs);

 	if (tx_data != NULL) {
 		tx_buf.buf = tx_data;
 		tx_buf.len = tx_count;
 		st7789v_set_cmd(dev, 0);
 		spi_write_dt(&config->bus, &tx_bufs);
 	}
 }

 static void st7789v_exit_sleep(const struct device *dev)
 {
 	st7789v_transmit(dev, ST7789V_CMD_SLEEP_OUT, NULL, 0);
 	k_sleep(K_MSEC(120));
 }

 static void st7789v_reset_display(const struct device *dev)
 {
 	LOG_DBG("Resetting display");

 	const struct st7789v_config *config = dev->config;
 	if (config->reset_gpio.port != NULL) {
 		k_sleep(K_MSEC(1));
 		gpio_pin_set_dt(&config->reset_gpio, 1);
 		k_sleep(K_MSEC(6));
 		gpio_pin_set_dt(&config->reset_gpio, 0);
 		k_sleep(K_MSEC(20));
 	} else {
 		st7789v_transmit(dev, ST7789V_CMD_SW_RESET, NULL, 0);
 		k_sleep(K_MSEC(5));
 	}
 }

 static int st7789v_blanking_on(const struct device *dev)
 {
 	st7789v_transmit(dev, ST7789V_CMD_DISP_OFF, NULL, 0);
 	return 0;
 }

 static int st7789v_blanking_off(const struct device *dev)
 {
 	st7789v_transmit(dev, ST7789V_CMD_DISP_ON, NULL, 0);
 	return 0;
 }

 static int st7789v_read(const struct device *dev,
 			const uint16_t x,
 			const uint16_t y,
 			const struct display_buffer_descriptor *desc,
 			void *buf)
 {
 	return -ENOTSUP;
 }

 static void st7789v_set_mem_area(const struct device *dev, const uint16_t x,
 				 const uint16_t y, const uint16_t w, const uint16_t h)
 {
 	struct st7789v_data *data = dev->data;
 	uint16_t spi_data[2];

 	uint16_t ram_x = x + data->x_offset;
 	uint16_t ram_y = y + data->y_offset;

 	spi_data[0] = sys_cpu_to_be16(ram_x);
 	spi_data[1] = sys_cpu_to_be16(ram_x + w - 1);
 	st7789v_transmit(dev, ST7789V_CMD_CASET, (uint8_t *)&spi_data[0], 4);

 	spi_data[0] = sys_cpu_to_be16(ram_y);
 	spi_data[1] = sys_cpu_to_be16(ram_y + h - 1);
 	st7789v_transmit(dev, ST7789V_CMD_RASET, (uint8_t *)&spi_data[0], 4);
 }

 static int st7789v_write(const struct device *dev,
 			 const uint16_t x,
 			 const uint16_t y,
 			 const struct display_buffer_descriptor *desc,
 			 const void *buf)
 {
 	const struct st7789v_config *config = dev->config;
 	const uint8_t *write_data_start = (uint8_t *) buf;
 	struct spi_buf tx_buf;
 	struct spi_buf_set tx_bufs;
 	uint16_t write_cnt;
 	uint16_t nbr_of_writes;
 	uint16_t write_h;

 	__ASSERT(desc->width <= desc->pitch, "Pitch is smaller then width");
 	__ASSERT((desc->pitch * ST7789V_PIXEL_SIZE * desc->height) <= desc->buf_size,
 			"Input buffer to small");

 	LOG_DBG("Writing %dx%d (w,h) @ %dx%d (x,y)",
 		desc->width, desc->height, x, y);
 	st7789v_set_mem_area(dev, x, y, desc->width, desc->height);

 	if (desc->pitch > desc->width) {
 		write_h = 1U;
 		nbr_of_writes = desc->height;
 	} else {
 		write_h = desc->height;
 		nbr_of_writes = 1U;
 	}

 	st7789v_transmit(dev, ST7789V_CMD_RAMWR,
 			 (void *) write_data_start,
 			 desc->width * ST7789V_PIXEL_SIZE * write_h);

 	tx_bufs.buffers = &tx_buf;
 	tx_bufs.count = 1;

 	write_data_start += (desc->pitch * ST7789V_PIXEL_SIZE);
 	for (write_cnt = 1U; write_cnt < nbr_of_writes; ++write_cnt) {
 		tx_buf.buf = (void *)write_data_start;
 		tx_buf.len = desc->width * ST7789V_PIXEL_SIZE * write_h;
 		spi_write_dt(&config->bus, &tx_bufs);
 		write_data_start += (desc->pitch * ST7789V_PIXEL_SIZE);
 	}

 	return 0;
 }

 static void *st7789v_get_framebuffer(const struct device *dev)
 {
 	return NULL;
 }

 static int st7789v_set_brightness(const struct device *dev,
 			   const uint8_t brightness)
 {
 	return -ENOTSUP;
 }

 static int st7789v_set_contrast(const struct device *dev,
 			 const uint8_t contrast)
 {
 	return -ENOTSUP;
 }

 static void st7789v_get_capabilities(const struct device *dev,
 			      struct display_capabilities *capabilities)
 {
 	const struct st7789v_config *config = dev->config;

 	memset(capabilities, 0, sizeof(struct display_capabilities));
 	capabilities->x_resolution = config->width;
 	capabilities->y_resolution = config->height;

 #ifdef CONFIG_ST7789V_RGB565
 	capabilities->supported_pixel_formats = PIXEL_FORMAT_RGB_565;
 	capabilities->current_pixel_format = PIXEL_FORMAT_RGB_565;
 #else
 	capabilities->supported_pixel_formats = PIXEL_FORMAT_RGB_888;
 	capabilities->current_pixel_format = PIXEL_FORMAT_RGB_888;
 #endif
 	capabilities->current_orientation = DISPLAY_ORIENTATION_NORMAL;
 }

 static int st7789v_set_pixel_format(const struct device *dev,
 			     const enum display_pixel_format pixel_format)
 {
 #ifdef CONFIG_ST7789V_RGB565
 	if (pixel_format == PIXEL_FORMAT_RGB_565) {
 #else
 	if (pixel_format == PIXEL_FORMAT_RGB_888) {
 #endif
 		return 0;
 	}
 	LOG_ERR("Pixel format change not implemented");
 	return -ENOTSUP;
 }

 static int st7789v_set_orientation(const struct device *dev,
 			    const enum display_orientation orientation)
 {
 	if (orientation == DISPLAY_ORIENTATION_NORMAL) {
 		return 0;
 	}
 	LOG_ERR("Changing display orientation not implemented");
 	return -ENOTSUP;
 }

 static void st7789v_lcd_init(const struct device *dev)
 {
 	struct st7789v_data *data = dev->data;
 	const struct st7789v_config *config = dev->config;
 	uint8_t tmp;

 	st7789v_set_lcd_margins(dev, data->x_offset,
 				data->y_offset);

 	st7789v_transmit(dev, ST7789V_CMD_CMD2EN,
 			 (uint8_t *)config->cmd2en_param,
 			 sizeof(config->cmd2en_param));

 	st7789v_transmit(dev, ST7789V_CMD_PORCTRL,
 			 (uint8_t *)config->porch_param,
 			 sizeof(config->porch_param));

 	/* Digital Gamma Enable, default disabled */
 	tmp = 0x00;
 	st7789v_transmit(dev, ST7789V_CMD_DGMEN, &tmp, 1);

 	/* Frame Rate Control in Normal Mode, default value */
 	tmp = 0x0f;
 	st7789v_transmit(dev, ST7789V_CMD_FRCTRL2, &tmp, 1);

 	tmp = config->gctrl;
 	st7789v_transmit(dev, ST7789V_CMD_GCTRL, &tmp, 1);

 	tmp = config->vcom;
 	st7789v_transmit(dev, ST7789V_CMD_VCOMS, &tmp, 1);

 	if (config->vdv_vrh_enable) {
 		tmp = 0x01;
 		st7789v_transmit(dev, ST7789V_CMD_VDVVRHEN, &tmp, 1);

 		tmp = config->vrh_value;
 		st7789v_transmit(dev, ST7789V_CMD_VRH, &tmp, 1);

 		tmp = config->vdv_value;
 		st7789v_transmit(dev, ST7789V_CMD_VDS, &tmp, 1);
 	}

 	st7789v_transmit(dev, ST7789V_CMD_PWCTRL1,
 			 (uint8_t *)config->pwctrl1_param,
 			 sizeof(config->pwctrl1_param));

 	/* Memory Data Access Control */
 	tmp = config->mdac;
 	st7789v_transmit(dev, ST7789V_CMD_MADCTL, &tmp, 1);

 	/* Interface Pixel Format */
 	tmp = config->colmod;
 	st7789v_transmit(dev, ST7789V_CMD_COLMOD, &tmp, 1);

 	tmp = config->lcm;
 	st7789v_transmit(dev, ST7789V_CMD_LCMCTRL, &tmp, 1);

 	tmp = config->gamma;
 	st7789v_transmit(dev, ST7789V_CMD_GAMSET, &tmp, 1);

 	st7789v_transmit(dev, ST7789V_CMD_INV_ON, NULL, 0);

 	st7789v_transmit(dev, ST7789V_CMD_PVGAMCTRL,
 			 (uint8_t *)config->pvgam_param,
 			 sizeof(config->pvgam_param));

 	st7789v_transmit(dev, ST7789V_CMD_NVGAMCTRL,
 			 (uint8_t *)config->nvgam_param,
 			 sizeof(config->nvgam_param));

 	st7789v_transmit(dev, ST7789V_CMD_RAMCTRL,
 			 (uint8_t *)config->ram_param,
 			 sizeof(config->ram_param));

 	st7789v_transmit(dev, ST7789V_CMD_RGBCTRL,
 			 (uint8_t *)config->rgb_param,
 			 sizeof(config->rgb_param));
 }

 static int st7789v_init(const struct device *dev)
 {
 	const struct st7789v_config *config = dev->config;

 	if (!spi_is_ready(&config->bus)) {
 		LOG_ERR("SPI device not ready");
 		return -ENODEV;
 	}

 	if (config->reset_gpio.port != NULL) {
 		if (!device_is_ready(config->reset_gpio.port)) {
 			LOG_ERR("Reset GPIO device not ready");
 			return -ENODEV;
 		}

 		if (gpio_pin_configure_dt(&config->reset_gpio, GPIO_OUTPUT_INACTIVE)) {
 			LOG_ERR("Couldn't configure reset pin");
 			return -EIO;
 		}
 	}

 	if (!device_is_ready(config->cmd_data_gpio.port)) {
 		LOG_ERR("Reset GPIO device not ready");
 		return -ENODEV;
 	}

 	if (gpio_pin_configure_dt(&config->cmd_data_gpio, GPIO_OUTPUT)) {
 		LOG_ERR("Couldn't configure cmd/DATA pin");
 		return -EIO;
 	}

 	st7789v_reset_display(dev);

 	st7789v_blanking_on(dev);

 	st7789v_lcd_init(dev);

 	st7789v_exit_sleep(dev);

 	return 0;
 }

 #ifdef CONFIG_PM_DEVICE
 static int st7789v_pm_action(const struct device *dev,
 			     enum pm_device_action action)
 {
 	int ret = 0;

 	switch (action) {
 	case PM_DEVICE_ACTION_RESUME:
 		st7789v_exit_sleep(dev);
 		break;
 	case PM_DEVICE_ACTION_SUSPEND:
 		st7789v_transmit(dev, ST7789V_CMD_SLEEP_IN, NULL, 0);
 		break;
 	default:
 		ret = -ENOTSUP;
 		break;
 	}

 	return ret;
 }
 #endif /* CONFIG_PM_DEVICE */

 static const struct display_driver_api st7789v_api = {
 	.blanking_on = st7789v_blanking_on,
 	.blanking_off = st7789v_blanking_off,
 	.write = st7789v_write,
 	.read = st7789v_read,
 	.get_framebuffer = st7789v_get_framebuffer,
 	.set_brightness = st7789v_set_brightness,
 	.set_contrast = st7789v_set_contrast,
 	.get_capabilities = st7789v_get_capabilities,
 	.set_pixel_format = st7789v_set_pixel_format,
 	.set_orientation = st7789v_set_orientation,
 };

 #define ST7789V_INIT(inst)							\
 	static const struct st7789v_config st7789v_config_ ## inst = {		\
 		.bus = SPI_DT_SPEC_INST_GET(inst, SPI_OP_MODE_MASTER |          \
 							  SPI_WORD_SET(8), 0),	\
 		.cmd_data_gpio = GPIO_DT_SPEC_INST_GET(inst, cmd_data_gpios),	\
 		.reset_gpio = GPIO_DT_SPEC_INST_GET_OR(inst, reset_gpios, {}),	\
 		.vcom = DT_INST_PROP(inst, vcom),				\
 		.gctrl = DT_INST_PROP(inst, gctrl),				\
 		.vdv_vrh_enable = (DT_INST_NODE_HAS_PROP(inst, vrhs)            \
 					&& DT_INST_NODE_HAS_PROP(inst, vdvs)),	\
 		.vrh_value = DT_INST_PROP_OR(inst, vrhs, 0),			\
 		.vdv_value = DT_INST_PROP_OR(inst, vdvs, 0),			\
 		.mdac = DT_INST_PROP(inst, mdac),				\
 		.gamma = DT_INST_PROP(inst, gamma),				\
 		.colmod = DT_INST_PROP(inst, colmod),				\
 		.lcm = DT_INST_PROP(inst, lcm),					\
 		.porch_param = DT_INST_PROP(inst, porch_param),			\
 		.cmd2en_param = DT_INST_PROP(inst, cmd2en_param),		\
 		.pwctrl1_param = DT_INST_PROP(inst, pwctrl1_param),		\
 		.pvgam_param = DT_INST_PROP(inst, pvgam_param),			\
 		.nvgam_param = DT_INST_PROP(inst, nvgam_param),			\
 		.ram_param = DT_INST_PROP(inst, ram_param),			\
 		.rgb_param = DT_INST_PROP(inst, rgb_param),			\
 		.width = DT_INST_PROP(inst, width),				\
 		.height = DT_INST_PROP(inst, height),				\
 	};									\
 										\
 	static struct st7789v_data st7789v_data_ ## inst = {			\
 		.x_offset = DT_INST_PROP(inst, x_offset),			\
 		.y_offset = DT_INST_PROP(inst, y_offset),			\
 	};									\
 										\
 	PM_DEVICE_DT_INST_DEFINE(inst, st7789v_pm_action);			\
 										\
 	DEVICE_DT_INST_DEFINE(inst, &st7789v_init, PM_DEVICE_DT_INST_GET(inst), \
 			&st7789v_data_ ## inst, &st7789v_config_ ## inst,	\
 			POST_KERNEL, CONFIG_DISPLAY_INIT_PRIORITY,		\
 			&st7789v_api);

 DT_INST_FOREACH_STATUS_OKAY(ST7789V_INIT)
	/*
	* Copyright (c) 2017 Jan Van Winkel <jan.van_winkel@dxplore.eu>
	* Copyright (c) 2019 Nordic Semiconductor ASA
	* Copyright (c) 2019 Marc Reilly
	* Copyright (c) 2019 PHYTEC Messtechnik GmbH
	* Copyright (c) 2020 Endian Technologies AB
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#define DT_DRV_COMPAT sitronix_st7789v

	#include "display_st7789v.h"

	#include <zephyr/device.h>
	#include <zephyr/drivers/spi.h>
	#include <zephyr/drivers/gpio.h>
	#include <zephyr/pm/device.h>
	#include <zephyr/sys/byteorder.h>
	#include <zephyr/drivers/display.h>

	#define LOG_LEVEL CONFIG_DISPLAY_LOG_LEVEL
	#include <zephyr/logging/log.h>
	LOG_MODULE_REGISTER(display_st7789v);

	struct st7789v_config {
	struct spi_dt_spec bus;
	struct gpio_dt_spec cmd_data_gpio;
	struct gpio_dt_spec reset_gpio;
	uint8_t vcom;
	uint8_t gctrl;
	bool vdv_vrh_enable;
	uint8_t vrh_value;
	uint8_t vdv_value;
	uint8_t mdac;
	uint8_t gamma;
	uint8_t colmod;
	uint8_t lcm;
	uint8_t porch_param[5];
	uint8_t cmd2en_param[4];
	uint8_t pwctrl1_param[2];
	uint8_t pvgam_param[14];
	uint8_t nvgam_param[14];
	uint8_t ram_param[2];
	uint8_t rgb_param[3];
	uint16_t height;
	uint16_t width;
	};

	struct st7789v_data {
	uint16_t x_offset;
	uint16_t y_offset;
	};

	#ifdef CONFIG_ST7789V_RGB565
	#define ST7789V_PIXEL_SIZE 2u
	#else
	#define ST7789V_PIXEL_SIZE 3u
	#endif

	static void st7789v_set_lcd_margins(const struct device *dev,
	uint16_t x_offset, uint16_t y_offset)
	{
	struct st7789v_data *data = dev->data;

	data->x_offset = x_offset;
	data->y_offset = y_offset;
	}

	static void st7789v_set_cmd(const struct device *dev, int is_cmd)
	{
	const struct st7789v_config *config = dev->config;

	gpio_pin_set_dt(&config->cmd_data_gpio, is_cmd);
	}

	static void st7789v_transmit(const struct device *dev, uint8_t cmd,
	uint8_t *tx_data, size_t tx_count)
	{
	const struct st7789v_config *config = dev->config;

	struct spi_buf tx_buf = { .buf = &cmd, .len = 1 };
	struct spi_buf_set tx_bufs = { .buffers = &tx_buf, .count = 1 };

	st7789v_set_cmd(dev, 1);
	spi_write_dt(&config->bus, &tx_bufs);

	if (tx_data != NULL) {
	tx_buf.buf = tx_data;
	tx_buf.len = tx_count;
	st7789v_set_cmd(dev, 0);
	spi_write_dt(&config->bus, &tx_bufs);
	}
	}

	static void st7789v_exit_sleep(const struct device *dev)
	{
	st7789v_transmit(dev, ST7789V_CMD_SLEEP_OUT, NULL, 0);
	k_sleep(K_MSEC(120));
	}

	static void st7789v_reset_display(const struct device *dev)
	{
	LOG_DBG("Resetting display");

	const struct st7789v_config *config = dev->config;
	if (config->reset_gpio.port != NULL) {
	k_sleep(K_MSEC(1));
	gpio_pin_set_dt(&config->reset_gpio, 1);
	k_sleep(K_MSEC(6));
	gpio_pin_set_dt(&config->reset_gpio, 0);
	k_sleep(K_MSEC(20));
	} else {
	st7789v_transmit(dev, ST7789V_CMD_SW_RESET, NULL, 0);
	k_sleep(K_MSEC(5));
	}
	}

	static int st7789v_blanking_on(const struct device *dev)
	{
	st7789v_transmit(dev, ST7789V_CMD_DISP_OFF, NULL, 0);
	return 0;
	}

	static int st7789v_blanking_off(const struct device *dev)
	{
	st7789v_transmit(dev, ST7789V_CMD_DISP_ON, NULL, 0);
	return 0;
	}

	static int st7789v_read(const struct device *dev,
	const uint16_t x,
	const uint16_t y,
	const struct display_buffer_descriptor *desc,
	void *buf)
	{
	return -ENOTSUP;
	}

	static void st7789v_set_mem_area(const struct device *dev, const uint16_t x,
	const uint16_t y, const uint16_t w, const uint16_t h)
	{
	struct st7789v_data *data = dev->data;
	uint16_t spi_data[2];

	uint16_t ram_x = x + data->x_offset;
	uint16_t ram_y = y + data->y_offset;

	spi_data[0] = sys_cpu_to_be16(ram_x);
	spi_data[1] = sys_cpu_to_be16(ram_x + w - 1);
	st7789v_transmit(dev, ST7789V_CMD_CASET, (uint8_t *)&spi_data[0], 4);

	spi_data[0] = sys_cpu_to_be16(ram_y);
	spi_data[1] = sys_cpu_to_be16(ram_y + h - 1);
	st7789v_transmit(dev, ST7789V_CMD_RASET, (uint8_t *)&spi_data[0], 4);
	}

	static int st7789v_write(const struct device *dev,
	const uint16_t x,
	const uint16_t y,
	const struct display_buffer_descriptor *desc,
	const void *buf)
	{
	const struct st7789v_config *config = dev->config;
	const uint8_t write_data_start = (uint8_t ) buf;
	struct spi_buf tx_buf;
	struct spi_buf_set tx_bufs;
	uint16_t write_cnt;
	uint16_t nbr_of_writes;
	uint16_t write_h;

	__ASSERT(desc->width <= desc->pitch, "Pitch is smaller then width");
	__ASSERT((desc->pitch * ST7789V_PIXEL_SIZE * desc->height) <= desc->buf_size,
	"Input buffer to small");

	LOG_DBG("Writing %dx%d (w,h) @ %dx%d (x,y)",
	desc->width, desc->height, x, y);
	st7789v_set_mem_area(dev, x, y, desc->width, desc->height);

	if (desc->pitch > desc->width) {
	write_h = 1U;
	nbr_of_writes = desc->height;
	} else {
	write_h = desc->height;
	nbr_of_writes = 1U;
	}

	st7789v_transmit(dev, ST7789V_CMD_RAMWR,
	(void *) write_data_start,
	desc->width * ST7789V_PIXEL_SIZE * write_h);

	tx_bufs.buffers = &tx_buf;
	tx_bufs.count = 1;

	write_data_start += (desc->pitch * ST7789V_PIXEL_SIZE);
	for (write_cnt = 1U; write_cnt < nbr_of_writes; ++write_cnt) {
	tx_buf.buf = (void *)write_data_start;
	tx_buf.len = desc->width * ST7789V_PIXEL_SIZE * write_h;
	spi_write_dt(&config->bus, &tx_bufs);
	write_data_start += (desc->pitch * ST7789V_PIXEL_SIZE);
	}

	return 0;
	}

	static void st7789v_get_framebuffer(const struct device dev)
	{
	return NULL;
	}

	static int st7789v_set_brightness(const struct device *dev,
	const uint8_t brightness)
	{
	return -ENOTSUP;
	}

	static int st7789v_set_contrast(const struct device *dev,
	const uint8_t contrast)
	{
	return -ENOTSUP;
	}

	static void st7789v_get_capabilities(const struct device *dev,
	struct display_capabilities *capabilities)
	{
	const struct st7789v_config *config = dev->config;

	memset(capabilities, 0, sizeof(struct display_capabilities));
	capabilities->x_resolution = config->width;
	capabilities->y_resolution = config->height;

	#ifdef CONFIG_ST7789V_RGB565
	capabilities->supported_pixel_formats = PIXEL_FORMAT_RGB_565;
	capabilities->current_pixel_format = PIXEL_FORMAT_RGB_565;
	#else
	capabilities->supported_pixel_formats = PIXEL_FORMAT_RGB_888;
	capabilities->current_pixel_format = PIXEL_FORMAT_RGB_888;
	#endif
	capabilities->current_orientation = DISPLAY_ORIENTATION_NORMAL;
	}

	static int st7789v_set_pixel_format(const struct device *dev,
	const enum display_pixel_format pixel_format)
	{
	#ifdef CONFIG_ST7789V_RGB565
	if (pixel_format == PIXEL_FORMAT_RGB_565) {
	#else
	if (pixel_format == PIXEL_FORMAT_RGB_888) {
	#endif
	return 0;
	}
	LOG_ERR("Pixel format change not implemented");
	return -ENOTSUP;
	}

	static int st7789v_set_orientation(const struct device *dev,
	const enum display_orientation orientation)
	{
	if (orientation == DISPLAY_ORIENTATION_NORMAL) {
	return 0;
	}
	LOG_ERR("Changing display orientation not implemented");
	return -ENOTSUP;
	}

	static void st7789v_lcd_init(const struct device *dev)
	{
	struct st7789v_data *data = dev->data;
	const struct st7789v_config *config = dev->config;
	uint8_t tmp;

	st7789v_set_lcd_margins(dev, data->x_offset,
	data->y_offset);

	st7789v_transmit(dev, ST7789V_CMD_CMD2EN,
	(uint8_t *)config->cmd2en_param,
	sizeof(config->cmd2en_param));

	st7789v_transmit(dev, ST7789V_CMD_PORCTRL,
	(uint8_t *)config->porch_param,
	sizeof(config->porch_param));

	/* Digital Gamma Enable, default disabled */
	tmp = 0x00;
	st7789v_transmit(dev, ST7789V_CMD_DGMEN, &tmp, 1);

	/* Frame Rate Control in Normal Mode, default value */
	tmp = 0x0f;
	st7789v_transmit(dev, ST7789V_CMD_FRCTRL2, &tmp, 1);

	tmp = config->gctrl;
	st7789v_transmit(dev, ST7789V_CMD_GCTRL, &tmp, 1);

	tmp = config->vcom;
	st7789v_transmit(dev, ST7789V_CMD_VCOMS, &tmp, 1);

	if (config->vdv_vrh_enable) {
	tmp = 0x01;
	st7789v_transmit(dev, ST7789V_CMD_VDVVRHEN, &tmp, 1);

	tmp = config->vrh_value;
	st7789v_transmit(dev, ST7789V_CMD_VRH, &tmp, 1);

	tmp = config->vdv_value;
	st7789v_transmit(dev, ST7789V_CMD_VDS, &tmp, 1);
	}

	st7789v_transmit(dev, ST7789V_CMD_PWCTRL1,
	(uint8_t *)config->pwctrl1_param,
	sizeof(config->pwctrl1_param));

	/* Memory Data Access Control */
	tmp = config->mdac;
	st7789v_transmit(dev, ST7789V_CMD_MADCTL, &tmp, 1);

	/* Interface Pixel Format */
	tmp = config->colmod;
	st7789v_transmit(dev, ST7789V_CMD_COLMOD, &tmp, 1);

	tmp = config->lcm;
	st7789v_transmit(dev, ST7789V_CMD_LCMCTRL, &tmp, 1);

	tmp = config->gamma;
	st7789v_transmit(dev, ST7789V_CMD_GAMSET, &tmp, 1);

	st7789v_transmit(dev, ST7789V_CMD_INV_ON, NULL, 0);

	st7789v_transmit(dev, ST7789V_CMD_PVGAMCTRL,
	(uint8_t *)config->pvgam_param,
	sizeof(config->pvgam_param));

	st7789v_transmit(dev, ST7789V_CMD_NVGAMCTRL,
	(uint8_t *)config->nvgam_param,
	sizeof(config->nvgam_param));

	st7789v_transmit(dev, ST7789V_CMD_RAMCTRL,
	(uint8_t *)config->ram_param,
	sizeof(config->ram_param));

	st7789v_transmit(dev, ST7789V_CMD_RGBCTRL,
	(uint8_t *)config->rgb_param,
	sizeof(config->rgb_param));
	}

	static int st7789v_init(const struct device *dev)
	{
	const struct st7789v_config *config = dev->config;

	if (!spi_is_ready(&config->bus)) {
	LOG_ERR("SPI device not ready");
	return -ENODEV;
	}

	if (config->reset_gpio.port != NULL) {
	if (!device_is_ready(config->reset_gpio.port)) {
	LOG_ERR("Reset GPIO device not ready");
	return -ENODEV;
	}

	if (gpio_pin_configure_dt(&config->reset_gpio, GPIO_OUTPUT_INACTIVE)) {
	LOG_ERR("Couldn't configure reset pin");
	return -EIO;
	}
	}

	if (!device_is_ready(config->cmd_data_gpio.port)) {
	LOG_ERR("Reset GPIO device not ready");
	return -ENODEV;
	}

	if (gpio_pin_configure_dt(&config->cmd_data_gpio, GPIO_OUTPUT)) {
	LOG_ERR("Couldn't configure cmd/DATA pin");
	return -EIO;
	}

	st7789v_reset_display(dev);

	st7789v_blanking_on(dev);

	st7789v_lcd_init(dev);

	st7789v_exit_sleep(dev);

	return 0;
	}

	#ifdef CONFIG_PM_DEVICE
	static int st7789v_pm_action(const struct device *dev,
	enum pm_device_action action)
	{
	int ret = 0;

	switch (action) {
	case PM_DEVICE_ACTION_RESUME:
	st7789v_exit_sleep(dev);
	break;
	case PM_DEVICE_ACTION_SUSPEND:
	st7789v_transmit(dev, ST7789V_CMD_SLEEP_IN, NULL, 0);
	break;
	default:
	ret = -ENOTSUP;
	break;
	}

	return ret;
	}
	#endif /* CONFIG_PM_DEVICE */

	static const struct display_driver_api st7789v_api = {
	.blanking_on = st7789v_blanking_on,
	.blanking_off = st7789v_blanking_off,
	.write = st7789v_write,
	.read = st7789v_read,
	.get_framebuffer = st7789v_get_framebuffer,
	.set_brightness = st7789v_set_brightness,
	.set_contrast = st7789v_set_contrast,
	.get_capabilities = st7789v_get_capabilities,
	.set_pixel_format = st7789v_set_pixel_format,
	.set_orientation = st7789v_set_orientation,
	};

	#define ST7789V_INIT(inst) \
	static const struct st7789v_config st7789v_config_ ## inst = { \
	.bus = SPI_DT_SPEC_INST_GET(inst, SPI_OP_MODE_MASTER \| \
	SPI_WORD_SET(8), 0), \
	.cmd_data_gpio = GPIO_DT_SPEC_INST_GET(inst, cmd_data_gpios), \
	.reset_gpio = GPIO_DT_SPEC_INST_GET_OR(inst, reset_gpios, {}), \
	.vcom = DT_INST_PROP(inst, vcom), \
	.gctrl = DT_INST_PROP(inst, gctrl), \
	.vdv_vrh_enable = (DT_INST_NODE_HAS_PROP(inst, vrhs) \
	&& DT_INST_NODE_HAS_PROP(inst, vdvs)), \
	.vrh_value = DT_INST_PROP_OR(inst, vrhs, 0), \
	.vdv_value = DT_INST_PROP_OR(inst, vdvs, 0), \
	.mdac = DT_INST_PROP(inst, mdac), \
	.gamma = DT_INST_PROP(inst, gamma), \
	.colmod = DT_INST_PROP(inst, colmod), \
	.lcm = DT_INST_PROP(inst, lcm), \
	.porch_param = DT_INST_PROP(inst, porch_param), \
	.cmd2en_param = DT_INST_PROP(inst, cmd2en_param), \
	.pwctrl1_param = DT_INST_PROP(inst, pwctrl1_param), \
	.pvgam_param = DT_INST_PROP(inst, pvgam_param), \
	.nvgam_param = DT_INST_PROP(inst, nvgam_param), \
	.ram_param = DT_INST_PROP(inst, ram_param), \
	.rgb_param = DT_INST_PROP(inst, rgb_param), \
	.width = DT_INST_PROP(inst, width), \
	.height = DT_INST_PROP(inst, height), \
	}; \
	\
	static struct st7789v_data st7789v_data_ ## inst = { \
	.x_offset = DT_INST_PROP(inst, x_offset), \
	.y_offset = DT_INST_PROP(inst, y_offset), \
	}; \
	\
	PM_DEVICE_DT_INST_DEFINE(inst, st7789v_pm_action); \
	\
	DEVICE_DT_INST_DEFINE(inst, &st7789v_init, PM_DEVICE_DT_INST_GET(inst), \
	&st7789v_data_ ## inst, &st7789v_config_ ## inst, \
	POST_KERNEL, CONFIG_DISPLAY_INIT_PRIORITY, \
	&st7789v_api);

	DT_INST_FOREACH_STATUS_OKAY(ST7789V_INIT)