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

 // SPDX-License-Identifier: GPL-2.0-only
 /* Copyright (c) 2020 HiSilicon Limited. */
 #include <linux/gpio/driver.h>
 #include <linux/module.h>
 #include <linux/mod_devicetable.h>
 #include <linux/platform_device.h>
 #include <linux/property.h>

 #define HISI_GPIO_SWPORT_DR_SET_WX	0x000
 #define HISI_GPIO_SWPORT_DR_CLR_WX	0x004
 #define HISI_GPIO_SWPORT_DDR_SET_WX	0x010
 #define HISI_GPIO_SWPORT_DDR_CLR_WX	0x014
 #define HISI_GPIO_SWPORT_DDR_ST_WX	0x018
 #define HISI_GPIO_INTEN_SET_WX		0x020
 #define HISI_GPIO_INTEN_CLR_WX		0x024
 #define HISI_GPIO_INTMASK_SET_WX	0x030
 #define HISI_GPIO_INTMASK_CLR_WX	0x034
 #define HISI_GPIO_INTTYPE_EDGE_SET_WX	0x040
 #define HISI_GPIO_INTTYPE_EDGE_CLR_WX	0x044
 #define HISI_GPIO_INT_POLARITY_SET_WX	0x050
 #define HISI_GPIO_INT_POLARITY_CLR_WX	0x054
 #define HISI_GPIO_DEBOUNCE_SET_WX	0x060
 #define HISI_GPIO_DEBOUNCE_CLR_WX	0x064
 #define HISI_GPIO_INTSTATUS_WX		0x070
 #define HISI_GPIO_PORTA_EOI_WX		0x078
 #define HISI_GPIO_EXT_PORT_WX		0x080
 #define HISI_GPIO_INTCOMB_MASK_WX	0x0a0
 #define HISI_GPIO_INT_DEDGE_SET		0x0b0
 #define HISI_GPIO_INT_DEDGE_CLR		0x0b4
 #define HISI_GPIO_INT_DEDGE_ST		0x0b8

 #define HISI_GPIO_LINE_NUM_MAX	32
 #define HISI_GPIO_DRIVER_NAME	"gpio-hisi"

 struct hisi_gpio {
 	struct gpio_chip	chip;
 	struct device		*dev;
 	void __iomem		*reg_base;
 	unsigned int		line_num;
 	struct irq_chip		irq_chip;
 	int			irq;
 };

 static inline u32 hisi_gpio_read_reg(struct gpio_chip *chip,
 				     unsigned int off)
 {
 	struct hisi_gpio *hisi_gpio =
 			container_of(chip, struct hisi_gpio, chip);
 	void __iomem *reg = hisi_gpio->reg_base + off;

 	return readl(reg);
 }

 static inline void hisi_gpio_write_reg(struct gpio_chip *chip,
 				       unsigned int off, u32 val)
 {
 	struct hisi_gpio *hisi_gpio =
 			container_of(chip, struct hisi_gpio, chip);
 	void __iomem *reg = hisi_gpio->reg_base + off;

 	writel(val, reg);
 }

 static void hisi_gpio_set_debounce(struct gpio_chip *chip, unsigned int off,
 				   u32 debounce)
 {
 	if (debounce)
 		hisi_gpio_write_reg(chip, HISI_GPIO_DEBOUNCE_SET_WX, BIT(off));
 	else
 		hisi_gpio_write_reg(chip, HISI_GPIO_DEBOUNCE_CLR_WX, BIT(off));
 }

 static int hisi_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
 				unsigned long config)
 {
 	u32 config_para = pinconf_to_config_param(config);
 	u32 config_arg;

 	switch (config_para) {
 	case PIN_CONFIG_INPUT_DEBOUNCE:
 		config_arg = pinconf_to_config_argument(config);
 		hisi_gpio_set_debounce(chip, offset, config_arg);
 		break;
 	default:
 		return -ENOTSUPP;
 	}

 	return 0;
 }

 static void hisi_gpio_set_ack(struct irq_data *d)
 {
 	struct gpio_chip *chip = irq_data_get_irq_chip_data(d);

 	hisi_gpio_write_reg(chip, HISI_GPIO_PORTA_EOI_WX, BIT(irqd_to_hwirq(d)));
 }

 static void hisi_gpio_irq_set_mask(struct irq_data *d)
 {
 	struct gpio_chip *chip = irq_data_get_irq_chip_data(d);

 	hisi_gpio_write_reg(chip, HISI_GPIO_INTMASK_SET_WX, BIT(irqd_to_hwirq(d)));
 }

 static void hisi_gpio_irq_clr_mask(struct irq_data *d)
 {
 	struct gpio_chip *chip = irq_data_get_irq_chip_data(d);

 	hisi_gpio_write_reg(chip, HISI_GPIO_INTMASK_CLR_WX, BIT(irqd_to_hwirq(d)));
 }

 static int hisi_gpio_irq_set_type(struct irq_data *d, u32 type)
 {
 	struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
 	unsigned int mask = BIT(irqd_to_hwirq(d));

 	switch (type) {
 	case IRQ_TYPE_EDGE_BOTH:
 		hisi_gpio_write_reg(chip, HISI_GPIO_INT_DEDGE_SET, mask);
 		break;
 	case IRQ_TYPE_EDGE_RISING:
 		hisi_gpio_write_reg(chip, HISI_GPIO_INTTYPE_EDGE_SET_WX, mask);
 		hisi_gpio_write_reg(chip, HISI_GPIO_INT_POLARITY_SET_WX, mask);
 		break;
 	case IRQ_TYPE_EDGE_FALLING:
 		hisi_gpio_write_reg(chip, HISI_GPIO_INTTYPE_EDGE_SET_WX, mask);
 		hisi_gpio_write_reg(chip, HISI_GPIO_INT_POLARITY_CLR_WX, mask);
 		break;
 	case IRQ_TYPE_LEVEL_HIGH:
 		hisi_gpio_write_reg(chip, HISI_GPIO_INTTYPE_EDGE_CLR_WX, mask);
 		hisi_gpio_write_reg(chip, HISI_GPIO_INT_POLARITY_SET_WX, mask);
 		break;
 	case IRQ_TYPE_LEVEL_LOW:
 		hisi_gpio_write_reg(chip, HISI_GPIO_INTTYPE_EDGE_CLR_WX, mask);
 		hisi_gpio_write_reg(chip, HISI_GPIO_INT_POLARITY_CLR_WX, mask);
 		break;
 	default:
 		return -EINVAL;
 	}

 	/*
 	 * The dual-edge interrupt and other interrupt's registers do not
 	 * take effect at the same time. The registers of the two-edge
 	 * interrupts have higher priorities, the configuration of
 	 * the dual-edge interrupts must be disabled before the configuration
 	 * of other kind of interrupts.
 	 */
 	if (type != IRQ_TYPE_EDGE_BOTH) {
 		unsigned int both = hisi_gpio_read_reg(chip, HISI_GPIO_INT_DEDGE_ST);

 		if (both & mask)
 			hisi_gpio_write_reg(chip, HISI_GPIO_INT_DEDGE_CLR, mask);
 	}

 	if (type & IRQ_TYPE_LEVEL_MASK)
 		irq_set_handler_locked(d, handle_level_irq);
 	else if (type & IRQ_TYPE_EDGE_BOTH)
 		irq_set_handler_locked(d, handle_edge_irq);

 	return 0;
 }

 static void hisi_gpio_irq_enable(struct irq_data *d)
 {
 	struct gpio_chip *chip = irq_data_get_irq_chip_data(d);

 	hisi_gpio_irq_clr_mask(d);
 	hisi_gpio_write_reg(chip, HISI_GPIO_INTEN_SET_WX, BIT(irqd_to_hwirq(d)));
 }

 static void hisi_gpio_irq_disable(struct irq_data *d)
 {
 	struct gpio_chip *chip = irq_data_get_irq_chip_data(d);

 	hisi_gpio_irq_set_mask(d);
 	hisi_gpio_write_reg(chip, HISI_GPIO_INTEN_CLR_WX, BIT(irqd_to_hwirq(d)));
 }

 static void hisi_gpio_irq_handler(struct irq_desc *desc)
 {
 	struct hisi_gpio *hisi_gpio = irq_desc_get_handler_data(desc);
 	unsigned long irq_msk = hisi_gpio_read_reg(&hisi_gpio->chip,
 						   HISI_GPIO_INTSTATUS_WX);
 	struct irq_chip *irq_c = irq_desc_get_chip(desc);
 	int hwirq;

 	chained_irq_enter(irq_c, desc);
 	for_each_set_bit(hwirq, &irq_msk, HISI_GPIO_LINE_NUM_MAX)
 		generic_handle_domain_irq(hisi_gpio->chip.irq.domain,
 					  hwirq);
 	chained_irq_exit(irq_c, desc);
 }

 static void hisi_gpio_init_irq(struct hisi_gpio *hisi_gpio)
 {
 	struct gpio_chip *chip = &hisi_gpio->chip;
 	struct gpio_irq_chip *girq_chip = &chip->irq;

 	/* Set hooks for irq_chip */
 	hisi_gpio->irq_chip.irq_ack = hisi_gpio_set_ack;
 	hisi_gpio->irq_chip.irq_mask = hisi_gpio_irq_set_mask;
 	hisi_gpio->irq_chip.irq_unmask = hisi_gpio_irq_clr_mask;
 	hisi_gpio->irq_chip.irq_set_type = hisi_gpio_irq_set_type;
 	hisi_gpio->irq_chip.irq_enable = hisi_gpio_irq_enable;
 	hisi_gpio->irq_chip.irq_disable = hisi_gpio_irq_disable;

 	girq_chip->chip = &hisi_gpio->irq_chip;
 	girq_chip->default_type = IRQ_TYPE_NONE;
 	girq_chip->num_parents = 1;
 	girq_chip->parents = &hisi_gpio->irq;
 	girq_chip->parent_handler = hisi_gpio_irq_handler;
 	girq_chip->parent_handler_data = hisi_gpio;

 	/* Clear Mask of GPIO controller combine IRQ */
 	hisi_gpio_write_reg(chip, HISI_GPIO_INTCOMB_MASK_WX, 1);
 }

 static const struct acpi_device_id hisi_gpio_acpi_match[] = {
 	{"HISI0184", 0},
 	{}
 };
 MODULE_DEVICE_TABLE(acpi, hisi_gpio_acpi_match);

 static void hisi_gpio_get_pdata(struct device *dev,
 				struct hisi_gpio *hisi_gpio)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct fwnode_handle *fwnode;
 	int idx = 0;

 	device_for_each_child_node(dev, fwnode)  {
 		/* Cycle for once, no need for an array to save line_num */
 		if (fwnode_property_read_u32(fwnode, "ngpios",
 					     &hisi_gpio->line_num)) {
 			dev_err(dev,
 				"failed to get number of lines for port%d and use default value instead\n",
 				idx);
 			hisi_gpio->line_num = HISI_GPIO_LINE_NUM_MAX;
 		}

 		if (WARN_ON(hisi_gpio->line_num > HISI_GPIO_LINE_NUM_MAX))
 			hisi_gpio->line_num = HISI_GPIO_LINE_NUM_MAX;

 		hisi_gpio->irq = platform_get_irq(pdev, idx);

 		dev_info(dev,
 			 "get hisi_gpio[%d] with %d lines\n", idx,
 			 hisi_gpio->line_num);

 		idx++;
 	}
 }

 static int hisi_gpio_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct hisi_gpio *hisi_gpio;
 	int port_num;
 	int ret;

 	/*
 	 * One GPIO controller own one port currently,
 	 * if we get more from ACPI table, return error.
 	 */
 	port_num = device_get_child_node_count(dev);
 	if (WARN_ON(port_num != 1))
 		return -ENODEV;

 	hisi_gpio = devm_kzalloc(dev, sizeof(*hisi_gpio), GFP_KERNEL);
 	if (!hisi_gpio)
 		return -ENOMEM;

 	hisi_gpio->reg_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(hisi_gpio->reg_base))
 		return PTR_ERR(hisi_gpio->reg_base);

 	hisi_gpio_get_pdata(dev, hisi_gpio);

 	hisi_gpio->dev = dev;

 	ret = bgpio_init(&hisi_gpio->chip, hisi_gpio->dev, 0x4,
 			 hisi_gpio->reg_base + HISI_GPIO_EXT_PORT_WX,
 			 hisi_gpio->reg_base + HISI_GPIO_SWPORT_DR_SET_WX,
 			 hisi_gpio->reg_base + HISI_GPIO_SWPORT_DR_CLR_WX,
 			 hisi_gpio->reg_base + HISI_GPIO_SWPORT_DDR_SET_WX,
 			 hisi_gpio->reg_base + HISI_GPIO_SWPORT_DDR_CLR_WX,
 			 BGPIOF_NO_SET_ON_INPUT);
 	if (ret) {
 		dev_err(dev, "failed to init, ret = %d\n", ret);
 		return ret;
 	}

 	hisi_gpio->chip.set_config = hisi_gpio_set_config;
 	hisi_gpio->chip.ngpio = hisi_gpio->line_num;
 	hisi_gpio->chip.bgpio_dir_unreadable = 1;
 	hisi_gpio->chip.base = -1;

 	if (hisi_gpio->irq > 0)
 		hisi_gpio_init_irq(hisi_gpio);

 	ret = devm_gpiochip_add_data(dev, &hisi_gpio->chip, hisi_gpio);
 	if (ret) {
 		dev_err(dev, "failed to register gpiochip, ret = %d\n", ret);
 		return ret;
 	}

 	return 0;
 }

 static struct platform_driver hisi_gpio_driver = {
 	.driver		= {
 		.name	= HISI_GPIO_DRIVER_NAME,
 		.acpi_match_table = hisi_gpio_acpi_match,
 	},
 	.probe		= hisi_gpio_probe,
 };

 module_platform_driver(hisi_gpio_driver);

 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Luo Jiaxing <luojiaxing@huawei.com>");
 MODULE_DESCRIPTION("HiSilicon GPIO controller driver");
 MODULE_ALIAS("platform:" HISI_GPIO_DRIVER_NAME);
	// SPDX-License-Identifier: GPL-2.0-only
	/* Copyright (c) 2020 HiSilicon Limited. */
	#include <linux/gpio/driver.h>
	#include <linux/module.h>
	#include <linux/mod_devicetable.h>
	#include <linux/platform_device.h>
	#include <linux/property.h>

	#define HISI_GPIO_SWPORT_DR_SET_WX 0x000
	#define HISI_GPIO_SWPORT_DR_CLR_WX 0x004
	#define HISI_GPIO_SWPORT_DDR_SET_WX 0x010
	#define HISI_GPIO_SWPORT_DDR_CLR_WX 0x014
	#define HISI_GPIO_SWPORT_DDR_ST_WX 0x018
	#define HISI_GPIO_INTEN_SET_WX 0x020
	#define HISI_GPIO_INTEN_CLR_WX 0x024
	#define HISI_GPIO_INTMASK_SET_WX 0x030
	#define HISI_GPIO_INTMASK_CLR_WX 0x034
	#define HISI_GPIO_INTTYPE_EDGE_SET_WX 0x040
	#define HISI_GPIO_INTTYPE_EDGE_CLR_WX 0x044
	#define HISI_GPIO_INT_POLARITY_SET_WX 0x050
	#define HISI_GPIO_INT_POLARITY_CLR_WX 0x054
	#define HISI_GPIO_DEBOUNCE_SET_WX 0x060
	#define HISI_GPIO_DEBOUNCE_CLR_WX 0x064
	#define HISI_GPIO_INTSTATUS_WX 0x070
	#define HISI_GPIO_PORTA_EOI_WX 0x078
	#define HISI_GPIO_EXT_PORT_WX 0x080
	#define HISI_GPIO_INTCOMB_MASK_WX 0x0a0
	#define HISI_GPIO_INT_DEDGE_SET 0x0b0
	#define HISI_GPIO_INT_DEDGE_CLR 0x0b4
	#define HISI_GPIO_INT_DEDGE_ST 0x0b8

	#define HISI_GPIO_LINE_NUM_MAX 32
	#define HISI_GPIO_DRIVER_NAME "gpio-hisi"

	struct hisi_gpio {
	struct gpio_chip chip;
	struct device *dev;
	void __iomem *reg_base;
	unsigned int line_num;
	struct irq_chip irq_chip;
	int irq;
	};

	static inline u32 hisi_gpio_read_reg(struct gpio_chip *chip,
	unsigned int off)
	{
	struct hisi_gpio *hisi_gpio =
	container_of(chip, struct hisi_gpio, chip);
	void __iomem *reg = hisi_gpio->reg_base + off;

	return readl(reg);
	}

	static inline void hisi_gpio_write_reg(struct gpio_chip *chip,
	unsigned int off, u32 val)
	{
	struct hisi_gpio *hisi_gpio =
	container_of(chip, struct hisi_gpio, chip);
	void __iomem *reg = hisi_gpio->reg_base + off;

	writel(val, reg);
	}

	static void hisi_gpio_set_debounce(struct gpio_chip *chip, unsigned int off,
	u32 debounce)
	{
	if (debounce)
	hisi_gpio_write_reg(chip, HISI_GPIO_DEBOUNCE_SET_WX, BIT(off));
	else
	hisi_gpio_write_reg(chip, HISI_GPIO_DEBOUNCE_CLR_WX, BIT(off));
	}

	static int hisi_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
	unsigned long config)
	{
	u32 config_para = pinconf_to_config_param(config);
	u32 config_arg;

	switch (config_para) {
	case PIN_CONFIG_INPUT_DEBOUNCE:
	config_arg = pinconf_to_config_argument(config);
	hisi_gpio_set_debounce(chip, offset, config_arg);
	break;
	default:
	return -ENOTSUPP;
	}

	return 0;
	}

	static void hisi_gpio_set_ack(struct irq_data *d)
	{
	struct gpio_chip *chip = irq_data_get_irq_chip_data(d);

	hisi_gpio_write_reg(chip, HISI_GPIO_PORTA_EOI_WX, BIT(irqd_to_hwirq(d)));
	}

	static void hisi_gpio_irq_set_mask(struct irq_data *d)
	{
	struct gpio_chip *chip = irq_data_get_irq_chip_data(d);

	hisi_gpio_write_reg(chip, HISI_GPIO_INTMASK_SET_WX, BIT(irqd_to_hwirq(d)));
	}

	static void hisi_gpio_irq_clr_mask(struct irq_data *d)
	{
	struct gpio_chip *chip = irq_data_get_irq_chip_data(d);

	hisi_gpio_write_reg(chip, HISI_GPIO_INTMASK_CLR_WX, BIT(irqd_to_hwirq(d)));
	}

	static int hisi_gpio_irq_set_type(struct irq_data *d, u32 type)
	{
	struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
	unsigned int mask = BIT(irqd_to_hwirq(d));

	switch (type) {
	case IRQ_TYPE_EDGE_BOTH:
	hisi_gpio_write_reg(chip, HISI_GPIO_INT_DEDGE_SET, mask);
	break;
	case IRQ_TYPE_EDGE_RISING:
	hisi_gpio_write_reg(chip, HISI_GPIO_INTTYPE_EDGE_SET_WX, mask);
	hisi_gpio_write_reg(chip, HISI_GPIO_INT_POLARITY_SET_WX, mask);
	break;
	case IRQ_TYPE_EDGE_FALLING:
	hisi_gpio_write_reg(chip, HISI_GPIO_INTTYPE_EDGE_SET_WX, mask);
	hisi_gpio_write_reg(chip, HISI_GPIO_INT_POLARITY_CLR_WX, mask);
	break;
	case IRQ_TYPE_LEVEL_HIGH:
	hisi_gpio_write_reg(chip, HISI_GPIO_INTTYPE_EDGE_CLR_WX, mask);
	hisi_gpio_write_reg(chip, HISI_GPIO_INT_POLARITY_SET_WX, mask);
	break;
	case IRQ_TYPE_LEVEL_LOW:
	hisi_gpio_write_reg(chip, HISI_GPIO_INTTYPE_EDGE_CLR_WX, mask);
	hisi_gpio_write_reg(chip, HISI_GPIO_INT_POLARITY_CLR_WX, mask);
	break;
	default:
	return -EINVAL;
	}

	/*
	* The dual-edge interrupt and other interrupt's registers do not
	* take effect at the same time. The registers of the two-edge
	* interrupts have higher priorities, the configuration of
	* the dual-edge interrupts must be disabled before the configuration
	* of other kind of interrupts.
	*/
	if (type != IRQ_TYPE_EDGE_BOTH) {
	unsigned int both = hisi_gpio_read_reg(chip, HISI_GPIO_INT_DEDGE_ST);

	if (both & mask)
	hisi_gpio_write_reg(chip, HISI_GPIO_INT_DEDGE_CLR, mask);
	}

	if (type & IRQ_TYPE_LEVEL_MASK)
	irq_set_handler_locked(d, handle_level_irq);
	else if (type & IRQ_TYPE_EDGE_BOTH)
	irq_set_handler_locked(d, handle_edge_irq);

	return 0;
	}

	static void hisi_gpio_irq_enable(struct irq_data *d)
	{
	struct gpio_chip *chip = irq_data_get_irq_chip_data(d);

	hisi_gpio_irq_clr_mask(d);
	hisi_gpio_write_reg(chip, HISI_GPIO_INTEN_SET_WX, BIT(irqd_to_hwirq(d)));
	}

	static void hisi_gpio_irq_disable(struct irq_data *d)
	{
	struct gpio_chip *chip = irq_data_get_irq_chip_data(d);

	hisi_gpio_irq_set_mask(d);
	hisi_gpio_write_reg(chip, HISI_GPIO_INTEN_CLR_WX, BIT(irqd_to_hwirq(d)));
	}

	static void hisi_gpio_irq_handler(struct irq_desc *desc)
	{
	struct hisi_gpio *hisi_gpio = irq_desc_get_handler_data(desc);
	unsigned long irq_msk = hisi_gpio_read_reg(&hisi_gpio->chip,
	HISI_GPIO_INTSTATUS_WX);
	struct irq_chip *irq_c = irq_desc_get_chip(desc);
	int hwirq;

	chained_irq_enter(irq_c, desc);
	for_each_set_bit(hwirq, &irq_msk, HISI_GPIO_LINE_NUM_MAX)
	generic_handle_domain_irq(hisi_gpio->chip.irq.domain,
	hwirq);
	chained_irq_exit(irq_c, desc);
	}

	static void hisi_gpio_init_irq(struct hisi_gpio *hisi_gpio)
	{
	struct gpio_chip *chip = &hisi_gpio->chip;
	struct gpio_irq_chip *girq_chip = &chip->irq;

	/* Set hooks for irq_chip */
	hisi_gpio->irq_chip.irq_ack = hisi_gpio_set_ack;
	hisi_gpio->irq_chip.irq_mask = hisi_gpio_irq_set_mask;
	hisi_gpio->irq_chip.irq_unmask = hisi_gpio_irq_clr_mask;
	hisi_gpio->irq_chip.irq_set_type = hisi_gpio_irq_set_type;
	hisi_gpio->irq_chip.irq_enable = hisi_gpio_irq_enable;
	hisi_gpio->irq_chip.irq_disable = hisi_gpio_irq_disable;

	girq_chip->chip = &hisi_gpio->irq_chip;
	girq_chip->default_type = IRQ_TYPE_NONE;
	girq_chip->num_parents = 1;
	girq_chip->parents = &hisi_gpio->irq;
	girq_chip->parent_handler = hisi_gpio_irq_handler;
	girq_chip->parent_handler_data = hisi_gpio;

	/* Clear Mask of GPIO controller combine IRQ */
	hisi_gpio_write_reg(chip, HISI_GPIO_INTCOMB_MASK_WX, 1);
	}

	static const struct acpi_device_id hisi_gpio_acpi_match[] = {
	{"HISI0184", 0},
	{}
	};
	MODULE_DEVICE_TABLE(acpi, hisi_gpio_acpi_match);

	static void hisi_gpio_get_pdata(struct device *dev,
	struct hisi_gpio *hisi_gpio)
	{
	struct platform_device *pdev = to_platform_device(dev);
	struct fwnode_handle *fwnode;
	int idx = 0;

	device_for_each_child_node(dev, fwnode) {
	/* Cycle for once, no need for an array to save line_num */
	if (fwnode_property_read_u32(fwnode, "ngpios",
	&hisi_gpio->line_num)) {
	dev_err(dev,
	"failed to get number of lines for port%d and use default value instead\n",
	idx);
	hisi_gpio->line_num = HISI_GPIO_LINE_NUM_MAX;
	}

	if (WARN_ON(hisi_gpio->line_num > HISI_GPIO_LINE_NUM_MAX))
	hisi_gpio->line_num = HISI_GPIO_LINE_NUM_MAX;

	hisi_gpio->irq = platform_get_irq(pdev, idx);

	dev_info(dev,
	"get hisi_gpio[%d] with %d lines\n", idx,
	hisi_gpio->line_num);

	idx++;
	}
	}

	static int hisi_gpio_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct hisi_gpio *hisi_gpio;
	int port_num;
	int ret;

	/*
	* One GPIO controller own one port currently,
	* if we get more from ACPI table, return error.
	*/
	port_num = device_get_child_node_count(dev);
	if (WARN_ON(port_num != 1))
	return -ENODEV;

	hisi_gpio = devm_kzalloc(dev, sizeof(*hisi_gpio), GFP_KERNEL);
	if (!hisi_gpio)
	return -ENOMEM;

	hisi_gpio->reg_base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(hisi_gpio->reg_base))
	return PTR_ERR(hisi_gpio->reg_base);

	hisi_gpio_get_pdata(dev, hisi_gpio);

	hisi_gpio->dev = dev;

	ret = bgpio_init(&hisi_gpio->chip, hisi_gpio->dev, 0x4,
	hisi_gpio->reg_base + HISI_GPIO_EXT_PORT_WX,
	hisi_gpio->reg_base + HISI_GPIO_SWPORT_DR_SET_WX,
	hisi_gpio->reg_base + HISI_GPIO_SWPORT_DR_CLR_WX,
	hisi_gpio->reg_base + HISI_GPIO_SWPORT_DDR_SET_WX,
	hisi_gpio->reg_base + HISI_GPIO_SWPORT_DDR_CLR_WX,
	BGPIOF_NO_SET_ON_INPUT);
	if (ret) {
	dev_err(dev, "failed to init, ret = %d\n", ret);
	return ret;
	}

	hisi_gpio->chip.set_config = hisi_gpio_set_config;
	hisi_gpio->chip.ngpio = hisi_gpio->line_num;
	hisi_gpio->chip.bgpio_dir_unreadable = 1;
	hisi_gpio->chip.base = -1;

	if (hisi_gpio->irq > 0)
	hisi_gpio_init_irq(hisi_gpio);

	ret = devm_gpiochip_add_data(dev, &hisi_gpio->chip, hisi_gpio);
	if (ret) {
	dev_err(dev, "failed to register gpiochip, ret = %d\n", ret);
	return ret;
	}

	return 0;
	}

	static struct platform_driver hisi_gpio_driver = {
	.driver = {
	.name = HISI_GPIO_DRIVER_NAME,
	.acpi_match_table = hisi_gpio_acpi_match,
	},
	.probe = hisi_gpio_probe,
	};

	module_platform_driver(hisi_gpio_driver);

	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Luo Jiaxing <luojiaxing@huawei.com>");
	MODULE_DESCRIPTION("HiSilicon GPIO controller driver");
	MODULE_ALIAS("platform:" HISI_GPIO_DRIVER_NAME);