drivers/gpio/gpio-max77620.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * MAXIM MAX77620 GPIO driver
  *
  * Copyright (c) 2016, NVIDIA CORPORATION.  All rights reserved.
  */

 #include <linux/gpio/driver.h>
 #include <linux/interrupt.h>
 #include <linux/mfd/max77620.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>

 #define GPIO_REG_ADDR(offset) (MAX77620_REG_GPIO0 + offset)

 struct max77620_gpio {
 	struct gpio_chip	gpio_chip;
 	struct regmap		*rmap;
 	struct device		*dev;
 	struct mutex		buslock; /* irq_bus_lock */
 	unsigned int		irq_type[MAX77620_GPIO_NR];
 	bool			irq_enabled[MAX77620_GPIO_NR];
 };

 static irqreturn_t max77620_gpio_irqhandler(int irq, void *data)
 {
 	struct max77620_gpio *gpio = data;
 	unsigned int value, offset;
 	unsigned long pending;
 	int err;

 	err = regmap_read(gpio->rmap, MAX77620_REG_IRQ_LVL2_GPIO, &value);
 	if (err < 0) {
 		dev_err(gpio->dev, "REG_IRQ_LVL2_GPIO read failed: %d\n", err);
 		return IRQ_NONE;
 	}

 	pending = value;

 	for_each_set_bit(offset, &pending, MAX77620_GPIO_NR) {
 		unsigned int virq;

 		virq = irq_find_mapping(gpio->gpio_chip.irq.domain, offset);
 		handle_nested_irq(virq);
 	}

 	return IRQ_HANDLED;
 }

 static void max77620_gpio_irq_mask(struct irq_data *data)
 {
 	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
 	struct max77620_gpio *gpio = gpiochip_get_data(chip);

 	gpio->irq_enabled[data->hwirq] = false;
 }

 static void max77620_gpio_irq_unmask(struct irq_data *data)
 {
 	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
 	struct max77620_gpio *gpio = gpiochip_get_data(chip);

 	gpio->irq_enabled[data->hwirq] = true;
 }

 static int max77620_gpio_set_irq_type(struct irq_data *data, unsigned int type)
 {
 	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
 	struct max77620_gpio *gpio = gpiochip_get_data(chip);
 	unsigned int irq_type;

 	switch (type) {
 	case IRQ_TYPE_EDGE_RISING:
 		irq_type = MAX77620_CNFG_GPIO_INT_RISING;
 		break;

 	case IRQ_TYPE_EDGE_FALLING:
 		irq_type = MAX77620_CNFG_GPIO_INT_FALLING;
 		break;

 	case IRQ_TYPE_EDGE_BOTH:
 		irq_type = MAX77620_CNFG_GPIO_INT_RISING |
 			   MAX77620_CNFG_GPIO_INT_FALLING;
 		break;

 	default:
 		return -EINVAL;
 	}

 	gpio->irq_type[data->hwirq] = irq_type;

 	return 0;
 }

 static void max77620_gpio_bus_lock(struct irq_data *data)
 {
 	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
 	struct max77620_gpio *gpio = gpiochip_get_data(chip);

 	mutex_lock(&gpio->buslock);
 }

 static void max77620_gpio_bus_sync_unlock(struct irq_data *data)
 {
 	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
 	struct max77620_gpio *gpio = gpiochip_get_data(chip);
 	unsigned int value, offset = data->hwirq;
 	int err;

 	value = gpio->irq_enabled[offset] ? gpio->irq_type[offset] : 0;

 	err = regmap_update_bits(gpio->rmap, GPIO_REG_ADDR(offset),
 				 MAX77620_CNFG_GPIO_INT_MASK, value);
 	if (err < 0)
 		dev_err(chip->parent, "failed to update interrupt mask: %d\n",
 			err);

 	mutex_unlock(&gpio->buslock);
 }

 static struct irq_chip max77620_gpio_irqchip = {
 	.name		= "max77620-gpio",
 	.irq_mask	= max77620_gpio_irq_mask,
 	.irq_unmask	= max77620_gpio_irq_unmask,
 	.irq_set_type	= max77620_gpio_set_irq_type,
 	.irq_bus_lock	= max77620_gpio_bus_lock,
 	.irq_bus_sync_unlock = max77620_gpio_bus_sync_unlock,
 	.flags		= IRQCHIP_MASK_ON_SUSPEND,
 };

 static int max77620_gpio_dir_input(struct gpio_chip *gc, unsigned int offset)
 {
 	struct max77620_gpio *mgpio = gpiochip_get_data(gc);
 	int ret;

 	ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
 				 MAX77620_CNFG_GPIO_DIR_MASK,
 				 MAX77620_CNFG_GPIO_DIR_INPUT);
 	if (ret < 0)
 		dev_err(mgpio->dev, "CNFG_GPIOx dir update failed: %d\n", ret);

 	return ret;
 }

 static int max77620_gpio_get(struct gpio_chip *gc, unsigned int offset)
 {
 	struct max77620_gpio *mgpio = gpiochip_get_data(gc);
 	unsigned int val;
 	int ret;

 	ret = regmap_read(mgpio->rmap, GPIO_REG_ADDR(offset), &val);
 	if (ret < 0) {
 		dev_err(mgpio->dev, "CNFG_GPIOx read failed: %d\n", ret);
 		return ret;
 	}

 	if  (val & MAX77620_CNFG_GPIO_DIR_MASK)
 		return !!(val & MAX77620_CNFG_GPIO_INPUT_VAL_MASK);
 	else
 		return !!(val & MAX77620_CNFG_GPIO_OUTPUT_VAL_MASK);
 }

 static int max77620_gpio_dir_output(struct gpio_chip *gc, unsigned int offset,
 				    int value)
 {
 	struct max77620_gpio *mgpio = gpiochip_get_data(gc);
 	u8 val;
 	int ret;

 	val = (value) ? MAX77620_CNFG_GPIO_OUTPUT_VAL_HIGH :
 				MAX77620_CNFG_GPIO_OUTPUT_VAL_LOW;

 	ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
 				 MAX77620_CNFG_GPIO_OUTPUT_VAL_MASK, val);
 	if (ret < 0) {
 		dev_err(mgpio->dev, "CNFG_GPIOx val update failed: %d\n", ret);
 		return ret;
 	}

 	ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
 				 MAX77620_CNFG_GPIO_DIR_MASK,
 				 MAX77620_CNFG_GPIO_DIR_OUTPUT);
 	if (ret < 0)
 		dev_err(mgpio->dev, "CNFG_GPIOx dir update failed: %d\n", ret);

 	return ret;
 }

 static int max77620_gpio_set_debounce(struct max77620_gpio *mgpio,
 				      unsigned int offset,
 				      unsigned int debounce)
 {
 	u8 val;
 	int ret;

 	switch (debounce) {
 	case 0:
 		val = MAX77620_CNFG_GPIO_DBNC_None;
 		break;
 	case 1 ... 8000:
 		val = MAX77620_CNFG_GPIO_DBNC_8ms;
 		break;
 	case 8001 ... 16000:
 		val = MAX77620_CNFG_GPIO_DBNC_16ms;
 		break;
 	case 16001 ... 32000:
 		val = MAX77620_CNFG_GPIO_DBNC_32ms;
 		break;
 	default:
 		dev_err(mgpio->dev, "Illegal value %u\n", debounce);
 		return -EINVAL;
 	}

 	ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
 				 MAX77620_CNFG_GPIO_DBNC_MASK, val);
 	if (ret < 0)
 		dev_err(mgpio->dev, "CNFG_GPIOx_DBNC update failed: %d\n", ret);

 	return ret;
 }

 static void max77620_gpio_set(struct gpio_chip *gc, unsigned int offset,
 			      int value)
 {
 	struct max77620_gpio *mgpio = gpiochip_get_data(gc);
 	u8 val;
 	int ret;

 	val = (value) ? MAX77620_CNFG_GPIO_OUTPUT_VAL_HIGH :
 				MAX77620_CNFG_GPIO_OUTPUT_VAL_LOW;

 	ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
 				 MAX77620_CNFG_GPIO_OUTPUT_VAL_MASK, val);
 	if (ret < 0)
 		dev_err(mgpio->dev, "CNFG_GPIO_OUT update failed: %d\n", ret);
 }

 static int max77620_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
 				    unsigned long config)
 {
 	struct max77620_gpio *mgpio = gpiochip_get_data(gc);

 	switch (pinconf_to_config_param(config)) {
 	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
 		return regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
 					  MAX77620_CNFG_GPIO_DRV_MASK,
 					  MAX77620_CNFG_GPIO_DRV_OPENDRAIN);
 	case PIN_CONFIG_DRIVE_PUSH_PULL:
 		return regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
 					  MAX77620_CNFG_GPIO_DRV_MASK,
 					  MAX77620_CNFG_GPIO_DRV_PUSHPULL);
 	case PIN_CONFIG_INPUT_DEBOUNCE:
 		return max77620_gpio_set_debounce(mgpio, offset,
 			pinconf_to_config_argument(config));
 	default:
 		break;
 	}

 	return -ENOTSUPP;
 }

 static int max77620_gpio_irq_init_hw(struct gpio_chip *gc)
 {
 	struct max77620_gpio *gpio = gpiochip_get_data(gc);
 	unsigned int i;
 	int err;

 	/*
 	 * GPIO interrupts may be left ON after bootloader, hence let's
 	 * pre-initialize hardware to the expected state by disabling all
 	 * the interrupts.
 	 */
 	for (i = 0; i < MAX77620_GPIO_NR; i++) {
 		err = regmap_update_bits(gpio->rmap, GPIO_REG_ADDR(i),
 					 MAX77620_CNFG_GPIO_INT_MASK, 0);
 		if (err < 0) {
 			dev_err(gpio->dev,
 				"failed to disable interrupt: %d\n", err);
 			return err;
 		}
 	}

 	return 0;
 }

 static int max77620_gpio_probe(struct platform_device *pdev)
 {
 	struct max77620_chip *chip =  dev_get_drvdata(pdev->dev.parent);
 	struct max77620_gpio *mgpio;
 	struct gpio_irq_chip *girq;
 	unsigned int gpio_irq;
 	int ret;

 	ret = platform_get_irq(pdev, 0);
 	if (ret < 0)
 		return ret;

 	gpio_irq = ret;

 	mgpio = devm_kzalloc(&pdev->dev, sizeof(*mgpio), GFP_KERNEL);
 	if (!mgpio)
 		return -ENOMEM;

 	mutex_init(&mgpio->buslock);
 	mgpio->rmap = chip->rmap;
 	mgpio->dev = &pdev->dev;

 	mgpio->gpio_chip.label = pdev->name;
 	mgpio->gpio_chip.parent = pdev->dev.parent;
 	mgpio->gpio_chip.direction_input = max77620_gpio_dir_input;
 	mgpio->gpio_chip.get = max77620_gpio_get;
 	mgpio->gpio_chip.direction_output = max77620_gpio_dir_output;
 	mgpio->gpio_chip.set = max77620_gpio_set;
 	mgpio->gpio_chip.set_config = max77620_gpio_set_config;
 	mgpio->gpio_chip.ngpio = MAX77620_GPIO_NR;
 	mgpio->gpio_chip.can_sleep = 1;
 	mgpio->gpio_chip.base = -1;

 	girq = &mgpio->gpio_chip.irq;
 	girq->chip = &max77620_gpio_irqchip;
 	/* This will let us handle the parent IRQ in the driver */
 	girq->parent_handler = NULL;
 	girq->num_parents = 0;
 	girq->parents = NULL;
 	girq->default_type = IRQ_TYPE_NONE;
 	girq->handler = handle_edge_irq;
 	girq->init_hw = max77620_gpio_irq_init_hw;
 	girq->threaded = true;

 	platform_set_drvdata(pdev, mgpio);

 	ret = devm_gpiochip_add_data(&pdev->dev, &mgpio->gpio_chip, mgpio);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "gpio_init: Failed to add max77620_gpio\n");
 		return ret;
 	}

 	ret = devm_request_threaded_irq(&pdev->dev, gpio_irq, NULL,
 					max77620_gpio_irqhandler, IRQF_ONESHOT,
 					"max77620-gpio", mgpio);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to request IRQ: %d\n", ret);
 		return ret;
 	}

 	return 0;
 }

 static const struct platform_device_id max77620_gpio_devtype[] = {
 	{ .name = "max77620-gpio", },
 	{ .name = "max20024-gpio", },
 	{},
 };
 MODULE_DEVICE_TABLE(platform, max77620_gpio_devtype);

 static struct platform_driver max77620_gpio_driver = {
 	.driver.name	= "max77620-gpio",
 	.probe		= max77620_gpio_probe,
 	.id_table	= max77620_gpio_devtype,
 };

 module_platform_driver(max77620_gpio_driver);

 MODULE_DESCRIPTION("GPIO interface for MAX77620 and MAX20024 PMIC");
 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
 MODULE_AUTHOR("Chaitanya Bandi <bandik@nvidia.com>");
 MODULE_ALIAS("platform:max77620-gpio");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* MAXIM MAX77620 GPIO driver
	*
	* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
	*/

	#include <linux/gpio/driver.h>
	#include <linux/interrupt.h>
	#include <linux/mfd/max77620.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/regmap.h>

	#define GPIO_REG_ADDR(offset) (MAX77620_REG_GPIO0 + offset)

	struct max77620_gpio {
	struct gpio_chip gpio_chip;
	struct regmap *rmap;
	struct device *dev;
	struct mutex buslock; /* irq_bus_lock */
	unsigned int irq_type[MAX77620_GPIO_NR];
	bool irq_enabled[MAX77620_GPIO_NR];
	};

	static irqreturn_t max77620_gpio_irqhandler(int irq, void *data)
	{
	struct max77620_gpio *gpio = data;
	unsigned int value, offset;
	unsigned long pending;
	int err;

	err = regmap_read(gpio->rmap, MAX77620_REG_IRQ_LVL2_GPIO, &value);
	if (err < 0) {
	dev_err(gpio->dev, "REG_IRQ_LVL2_GPIO read failed: %d\n", err);
	return IRQ_NONE;
	}

	pending = value;

	for_each_set_bit(offset, &pending, MAX77620_GPIO_NR) {
	unsigned int virq;

	virq = irq_find_mapping(gpio->gpio_chip.irq.domain, offset);
	handle_nested_irq(virq);
	}

	return IRQ_HANDLED;
	}

	static void max77620_gpio_irq_mask(struct irq_data *data)
	{
	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
	struct max77620_gpio *gpio = gpiochip_get_data(chip);

	gpio->irq_enabled[data->hwirq] = false;
	}

	static void max77620_gpio_irq_unmask(struct irq_data *data)
	{
	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
	struct max77620_gpio *gpio = gpiochip_get_data(chip);

	gpio->irq_enabled[data->hwirq] = true;
	}

	static int max77620_gpio_set_irq_type(struct irq_data *data, unsigned int type)
	{
	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
	struct max77620_gpio *gpio = gpiochip_get_data(chip);
	unsigned int irq_type;

	switch (type) {
	case IRQ_TYPE_EDGE_RISING:
	irq_type = MAX77620_CNFG_GPIO_INT_RISING;
	break;

	case IRQ_TYPE_EDGE_FALLING:
	irq_type = MAX77620_CNFG_GPIO_INT_FALLING;
	break;

	case IRQ_TYPE_EDGE_BOTH:
	irq_type = MAX77620_CNFG_GPIO_INT_RISING \|
	MAX77620_CNFG_GPIO_INT_FALLING;
	break;

	default:
	return -EINVAL;
	}

	gpio->irq_type[data->hwirq] = irq_type;

	return 0;
	}

	static void max77620_gpio_bus_lock(struct irq_data *data)
	{
	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
	struct max77620_gpio *gpio = gpiochip_get_data(chip);

	mutex_lock(&gpio->buslock);
	}

	static void max77620_gpio_bus_sync_unlock(struct irq_data *data)
	{
	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
	struct max77620_gpio *gpio = gpiochip_get_data(chip);
	unsigned int value, offset = data->hwirq;
	int err;

	value = gpio->irq_enabled[offset] ? gpio->irq_type[offset] : 0;

	err = regmap_update_bits(gpio->rmap, GPIO_REG_ADDR(offset),
	MAX77620_CNFG_GPIO_INT_MASK, value);
	if (err < 0)
	dev_err(chip->parent, "failed to update interrupt mask: %d\n",
	err);

	mutex_unlock(&gpio->buslock);
	}

	static struct irq_chip max77620_gpio_irqchip = {
	.name = "max77620-gpio",
	.irq_mask = max77620_gpio_irq_mask,
	.irq_unmask = max77620_gpio_irq_unmask,
	.irq_set_type = max77620_gpio_set_irq_type,
	.irq_bus_lock = max77620_gpio_bus_lock,
	.irq_bus_sync_unlock = max77620_gpio_bus_sync_unlock,
	.flags = IRQCHIP_MASK_ON_SUSPEND,
	};

	static int max77620_gpio_dir_input(struct gpio_chip *gc, unsigned int offset)
	{
	struct max77620_gpio *mgpio = gpiochip_get_data(gc);
	int ret;

	ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
	MAX77620_CNFG_GPIO_DIR_MASK,
	MAX77620_CNFG_GPIO_DIR_INPUT);
	if (ret < 0)
	dev_err(mgpio->dev, "CNFG_GPIOx dir update failed: %d\n", ret);

	return ret;
	}

	static int max77620_gpio_get(struct gpio_chip *gc, unsigned int offset)
	{
	struct max77620_gpio *mgpio = gpiochip_get_data(gc);
	unsigned int val;
	int ret;

	ret = regmap_read(mgpio->rmap, GPIO_REG_ADDR(offset), &val);
	if (ret < 0) {
	dev_err(mgpio->dev, "CNFG_GPIOx read failed: %d\n", ret);
	return ret;
	}

	if (val & MAX77620_CNFG_GPIO_DIR_MASK)
	return !!(val & MAX77620_CNFG_GPIO_INPUT_VAL_MASK);
	else
	return !!(val & MAX77620_CNFG_GPIO_OUTPUT_VAL_MASK);
	}

	static int max77620_gpio_dir_output(struct gpio_chip *gc, unsigned int offset,
	int value)
	{
	struct max77620_gpio *mgpio = gpiochip_get_data(gc);
	u8 val;
	int ret;

	val = (value) ? MAX77620_CNFG_GPIO_OUTPUT_VAL_HIGH :
	MAX77620_CNFG_GPIO_OUTPUT_VAL_LOW;

	ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
	MAX77620_CNFG_GPIO_OUTPUT_VAL_MASK, val);
	if (ret < 0) {
	dev_err(mgpio->dev, "CNFG_GPIOx val update failed: %d\n", ret);
	return ret;
	}

	ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
	MAX77620_CNFG_GPIO_DIR_MASK,
	MAX77620_CNFG_GPIO_DIR_OUTPUT);
	if (ret < 0)
	dev_err(mgpio->dev, "CNFG_GPIOx dir update failed: %d\n", ret);

	return ret;
	}

	static int max77620_gpio_set_debounce(struct max77620_gpio *mgpio,
	unsigned int offset,
	unsigned int debounce)
	{
	u8 val;
	int ret;

	switch (debounce) {
	case 0:
	val = MAX77620_CNFG_GPIO_DBNC_None;
	break;
	case 1 ... 8000:
	val = MAX77620_CNFG_GPIO_DBNC_8ms;
	break;
	case 8001 ... 16000:
	val = MAX77620_CNFG_GPIO_DBNC_16ms;
	break;
	case 16001 ... 32000:
	val = MAX77620_CNFG_GPIO_DBNC_32ms;
	break;
	default:
	dev_err(mgpio->dev, "Illegal value %u\n", debounce);
	return -EINVAL;
	}

	ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
	MAX77620_CNFG_GPIO_DBNC_MASK, val);
	if (ret < 0)
	dev_err(mgpio->dev, "CNFG_GPIOx_DBNC update failed: %d\n", ret);

	return ret;
	}

	static void max77620_gpio_set(struct gpio_chip *gc, unsigned int offset,
	int value)
	{
	struct max77620_gpio *mgpio = gpiochip_get_data(gc);
	u8 val;
	int ret;

	val = (value) ? MAX77620_CNFG_GPIO_OUTPUT_VAL_HIGH :
	MAX77620_CNFG_GPIO_OUTPUT_VAL_LOW;

	ret = regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
	MAX77620_CNFG_GPIO_OUTPUT_VAL_MASK, val);
	if (ret < 0)
	dev_err(mgpio->dev, "CNFG_GPIO_OUT update failed: %d\n", ret);
	}

	static int max77620_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
	unsigned long config)
	{
	struct max77620_gpio *mgpio = gpiochip_get_data(gc);

	switch (pinconf_to_config_param(config)) {
	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
	return regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
	MAX77620_CNFG_GPIO_DRV_MASK,
	MAX77620_CNFG_GPIO_DRV_OPENDRAIN);
	case PIN_CONFIG_DRIVE_PUSH_PULL:
	return regmap_update_bits(mgpio->rmap, GPIO_REG_ADDR(offset),
	MAX77620_CNFG_GPIO_DRV_MASK,
	MAX77620_CNFG_GPIO_DRV_PUSHPULL);
	case PIN_CONFIG_INPUT_DEBOUNCE:
	return max77620_gpio_set_debounce(mgpio, offset,
	pinconf_to_config_argument(config));
	default:
	break;
	}

	return -ENOTSUPP;
	}

	static int max77620_gpio_irq_init_hw(struct gpio_chip *gc)
	{
	struct max77620_gpio *gpio = gpiochip_get_data(gc);
	unsigned int i;
	int err;

	/*
	* GPIO interrupts may be left ON after bootloader, hence let's
	* pre-initialize hardware to the expected state by disabling all
	* the interrupts.
	*/
	for (i = 0; i < MAX77620_GPIO_NR; i++) {
	err = regmap_update_bits(gpio->rmap, GPIO_REG_ADDR(i),
	MAX77620_CNFG_GPIO_INT_MASK, 0);
	if (err < 0) {
	dev_err(gpio->dev,
	"failed to disable interrupt: %d\n", err);
	return err;
	}
	}

	return 0;
	}

	static int max77620_gpio_probe(struct platform_device *pdev)
	{
	struct max77620_chip *chip = dev_get_drvdata(pdev->dev.parent);
	struct max77620_gpio *mgpio;
	struct gpio_irq_chip *girq;
	unsigned int gpio_irq;
	int ret;

	ret = platform_get_irq(pdev, 0);
	if (ret < 0)
	return ret;

	gpio_irq = ret;

	mgpio = devm_kzalloc(&pdev->dev, sizeof(*mgpio), GFP_KERNEL);
	if (!mgpio)
	return -ENOMEM;

	mutex_init(&mgpio->buslock);
	mgpio->rmap = chip->rmap;
	mgpio->dev = &pdev->dev;

	mgpio->gpio_chip.label = pdev->name;
	mgpio->gpio_chip.parent = pdev->dev.parent;
	mgpio->gpio_chip.direction_input = max77620_gpio_dir_input;
	mgpio->gpio_chip.get = max77620_gpio_get;
	mgpio->gpio_chip.direction_output = max77620_gpio_dir_output;
	mgpio->gpio_chip.set = max77620_gpio_set;
	mgpio->gpio_chip.set_config = max77620_gpio_set_config;
	mgpio->gpio_chip.ngpio = MAX77620_GPIO_NR;
	mgpio->gpio_chip.can_sleep = 1;
	mgpio->gpio_chip.base = -1;

	girq = &mgpio->gpio_chip.irq;
	girq->chip = &max77620_gpio_irqchip;
	/* This will let us handle the parent IRQ in the driver */
	girq->parent_handler = NULL;
	girq->num_parents = 0;
	girq->parents = NULL;
	girq->default_type = IRQ_TYPE_NONE;
	girq->handler = handle_edge_irq;
	girq->init_hw = max77620_gpio_irq_init_hw;
	girq->threaded = true;

	platform_set_drvdata(pdev, mgpio);

	ret = devm_gpiochip_add_data(&pdev->dev, &mgpio->gpio_chip, mgpio);
	if (ret < 0) {
	dev_err(&pdev->dev, "gpio_init: Failed to add max77620_gpio\n");
	return ret;
	}

	ret = devm_request_threaded_irq(&pdev->dev, gpio_irq, NULL,
	max77620_gpio_irqhandler, IRQF_ONESHOT,
	"max77620-gpio", mgpio);
	if (ret < 0) {
	dev_err(&pdev->dev, "failed to request IRQ: %d\n", ret);
	return ret;
	}

	return 0;
	}

	static const struct platform_device_id max77620_gpio_devtype[] = {
	{ .name = "max77620-gpio", },
	{ .name = "max20024-gpio", },
	{},
	};
	MODULE_DEVICE_TABLE(platform, max77620_gpio_devtype);

	static struct platform_driver max77620_gpio_driver = {
	.driver.name = "max77620-gpio",
	.probe = max77620_gpio_probe,
	.id_table = max77620_gpio_devtype,
	};

	module_platform_driver(max77620_gpio_driver);

	MODULE_DESCRIPTION("GPIO interface for MAX77620 and MAX20024 PMIC");
	MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
	MODULE_AUTHOR("Chaitanya Bandi <bandik@nvidia.com>");
	MODULE_ALIAS("platform:max77620-gpio");
	MODULE_LICENSE("GPL v2");