drivers/gpio/gpio-xgs-iproc.c - third_party/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2017 Broadcom
  */

 #include <linux/gpio/driver.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/irq.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/spinlock.h>

 #define IPROC_CCA_INT_F_GPIOINT		BIT(0)
 #define IPROC_CCA_INT_STS		0x20
 #define IPROC_CCA_INT_MASK		0x24

 #define IPROC_GPIO_CCA_DIN		0x0
 #define IPROC_GPIO_CCA_DOUT		0x4
 #define IPROC_GPIO_CCA_OUT_EN		0x8
 #define IPROC_GPIO_CCA_INT_LEVEL	0x10
 #define IPROC_GPIO_CCA_INT_LEVEL_MASK	0x14
 #define IPROC_GPIO_CCA_INT_EVENT	0x18
 #define IPROC_GPIO_CCA_INT_EVENT_MASK	0x1C
 #define IPROC_GPIO_CCA_INT_EDGE		0x24

 struct iproc_gpio_chip {
 	struct irq_chip irqchip;
 	struct gpio_chip gc;
 	spinlock_t lock;
 	struct device *dev;
 	void __iomem *base;
 	void __iomem *intr;
 };

 static inline struct iproc_gpio_chip *
 to_iproc_gpio(struct gpio_chip *gc)
 {
 	return container_of(gc, struct iproc_gpio_chip, gc);
 }

 static void iproc_gpio_irq_ack(struct irq_data *d)
 {
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 	struct iproc_gpio_chip *chip = to_iproc_gpio(gc);
 	int pin = d->hwirq;
 	unsigned long flags;
 	u32 irq = d->irq;
 	u32 irq_type, event_status = 0;

 	spin_lock_irqsave(&chip->lock, flags);
 	irq_type = irq_get_trigger_type(irq);
 	if (irq_type & IRQ_TYPE_EDGE_BOTH) {
 		event_status |= BIT(pin);
 		writel_relaxed(event_status,
 			       chip->base + IPROC_GPIO_CCA_INT_EVENT);
 	}
 	spin_unlock_irqrestore(&chip->lock, flags);
 }

 static void iproc_gpio_irq_unmask(struct irq_data *d)
 {
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 	struct iproc_gpio_chip *chip = to_iproc_gpio(gc);
 	int pin = d->hwirq;
 	unsigned long flags;
 	u32 irq = d->irq;
 	u32 int_mask, irq_type, event_mask;

 	spin_lock_irqsave(&chip->lock, flags);
 	irq_type = irq_get_trigger_type(irq);
 	event_mask = readl_relaxed(chip->base + IPROC_GPIO_CCA_INT_EVENT_MASK);
 	int_mask = readl_relaxed(chip->base + IPROC_GPIO_CCA_INT_LEVEL_MASK);

 	if (irq_type & IRQ_TYPE_EDGE_BOTH) {
 		event_mask |= 1 << pin;
 		writel_relaxed(event_mask,
 			       chip->base + IPROC_GPIO_CCA_INT_EVENT_MASK);
 	} else {
 		int_mask |= 1 << pin;
 		writel_relaxed(int_mask,
 			       chip->base + IPROC_GPIO_CCA_INT_LEVEL_MASK);
 	}
 	spin_unlock_irqrestore(&chip->lock, flags);
 }

 static void iproc_gpio_irq_mask(struct irq_data *d)
 {
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 	struct iproc_gpio_chip *chip = to_iproc_gpio(gc);
 	int pin = d->hwirq;
 	unsigned long flags;
 	u32 irq = d->irq;
 	u32 irq_type, int_mask, event_mask;

 	spin_lock_irqsave(&chip->lock, flags);
 	irq_type = irq_get_trigger_type(irq);
 	event_mask = readl_relaxed(chip->base + IPROC_GPIO_CCA_INT_EVENT_MASK);
 	int_mask = readl_relaxed(chip->base + IPROC_GPIO_CCA_INT_LEVEL_MASK);

 	if (irq_type & IRQ_TYPE_EDGE_BOTH) {
 		event_mask &= ~BIT(pin);
 		writel_relaxed(event_mask,
 			       chip->base + IPROC_GPIO_CCA_INT_EVENT_MASK);
 	} else {
 		int_mask &= ~BIT(pin);
 		writel_relaxed(int_mask,
 			       chip->base + IPROC_GPIO_CCA_INT_LEVEL_MASK);
 	}
 	spin_unlock_irqrestore(&chip->lock, flags);
 }

 static int iproc_gpio_irq_set_type(struct irq_data *d, u32 type)
 {
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 	struct iproc_gpio_chip *chip = to_iproc_gpio(gc);
 	int pin = d->hwirq;
 	unsigned long flags;
 	u32 irq = d->irq;
 	u32 event_pol, int_pol;
 	int ret = 0;

 	spin_lock_irqsave(&chip->lock, flags);
 	switch (type & IRQ_TYPE_SENSE_MASK) {
 	case IRQ_TYPE_EDGE_RISING:
 		event_pol = readl_relaxed(chip->base + IPROC_GPIO_CCA_INT_EDGE);
 		event_pol &= ~BIT(pin);
 		writel_relaxed(event_pol, chip->base + IPROC_GPIO_CCA_INT_EDGE);
 		break;
 	case IRQ_TYPE_EDGE_FALLING:
 		event_pol = readl_relaxed(chip->base + IPROC_GPIO_CCA_INT_EDGE);
 		event_pol |= BIT(pin);
 		writel_relaxed(event_pol, chip->base + IPROC_GPIO_CCA_INT_EDGE);
 		break;
 	case IRQ_TYPE_LEVEL_HIGH:
 		int_pol = readl_relaxed(chip->base + IPROC_GPIO_CCA_INT_LEVEL);
 		int_pol &= ~BIT(pin);
 		writel_relaxed(int_pol, chip->base + IPROC_GPIO_CCA_INT_LEVEL);
 		break;
 	case IRQ_TYPE_LEVEL_LOW:
 		int_pol = readl_relaxed(chip->base + IPROC_GPIO_CCA_INT_LEVEL);
 		int_pol |= BIT(pin);
 		writel_relaxed(int_pol, chip->base + IPROC_GPIO_CCA_INT_LEVEL);
 		break;
 	default:
 		/* should not come here */
 		ret = -EINVAL;
 		goto out_unlock;
 	}

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

 out_unlock:
 	spin_unlock_irqrestore(&chip->lock, flags);

 	return ret;
 }

 static irqreturn_t iproc_gpio_irq_handler(int irq, void *data)
 {
 	struct gpio_chip *gc = (struct gpio_chip *)data;
 	struct iproc_gpio_chip *chip = to_iproc_gpio(gc);
 	int bit;
 	unsigned long int_bits = 0;
 	u32 int_status;

 	/* go through the entire GPIOs and handle all interrupts */
 	int_status = readl_relaxed(chip->intr + IPROC_CCA_INT_STS);
 	if (int_status & IPROC_CCA_INT_F_GPIOINT) {
 		u32 event, level;

 		/* Get level and edge interrupts */
 		event =
 		    readl_relaxed(chip->base + IPROC_GPIO_CCA_INT_EVENT_MASK);
 		event &= readl_relaxed(chip->base + IPROC_GPIO_CCA_INT_EVENT);
 		level = readl_relaxed(chip->base + IPROC_GPIO_CCA_DIN);
 		level ^= readl_relaxed(chip->base + IPROC_GPIO_CCA_INT_LEVEL);
 		level &=
 		    readl_relaxed(chip->base + IPROC_GPIO_CCA_INT_LEVEL_MASK);
 		int_bits = level | event;

 		for_each_set_bit(bit, &int_bits, gc->ngpio)
 			generic_handle_irq(irq_linear_revmap(gc->irq.domain, bit));
 	}

 	return int_bits ? IRQ_HANDLED : IRQ_NONE;
 }

 static int iproc_gpio_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct device_node *dn = pdev->dev.of_node;
 	struct iproc_gpio_chip *chip;
 	u32 num_gpios;
 	int irq, ret;

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

 	chip->dev = dev;
 	platform_set_drvdata(pdev, chip);
 	spin_lock_init(&chip->lock);

 	chip->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(chip->base))
 		return PTR_ERR(chip->base);

 	ret = bgpio_init(&chip->gc, dev, 4,
 			 chip->base + IPROC_GPIO_CCA_DIN,
 			 chip->base + IPROC_GPIO_CCA_DOUT,
 			 NULL,
 			 chip->base + IPROC_GPIO_CCA_OUT_EN,
 			 NULL,
 			 0);
 	if (ret) {
 		dev_err(dev, "unable to init GPIO chip\n");
 		return ret;
 	}

 	chip->gc.label = dev_name(dev);
 	if (!of_property_read_u32(dn, "ngpios", &num_gpios))
 		chip->gc.ngpio = num_gpios;

 	irq = platform_get_irq(pdev, 0);
 	if (irq > 0) {
 		struct gpio_irq_chip *girq;
 		struct irq_chip *irqc;
 		u32 val;

 		irqc = &chip->irqchip;
 		irqc->name = dev_name(dev);
 		irqc->irq_ack = iproc_gpio_irq_ack;
 		irqc->irq_mask = iproc_gpio_irq_mask;
 		irqc->irq_unmask = iproc_gpio_irq_unmask;
 		irqc->irq_set_type = iproc_gpio_irq_set_type;

 		chip->intr = devm_platform_ioremap_resource(pdev, 1);
 		if (IS_ERR(chip->intr))
 			return PTR_ERR(chip->intr);

 		/* Enable GPIO interrupts for CCA GPIO */
 		val = readl_relaxed(chip->intr + IPROC_CCA_INT_MASK);
 		val |= IPROC_CCA_INT_F_GPIOINT;
 		writel_relaxed(val, chip->intr + IPROC_CCA_INT_MASK);

 		/*
 		 * Directly request the irq here instead of passing
 		 * a flow-handler because the irq is shared.
 		 */
 		ret = devm_request_irq(dev, irq, iproc_gpio_irq_handler,
 				       IRQF_SHARED, chip->gc.label, &chip->gc);
 		if (ret) {
 			dev_err(dev, "Fail to request IRQ%d: %d\n", irq, ret);
 			return ret;
 		}

 		girq = &chip->gc.irq;
 		girq->chip = irqc;
 		/* 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_simple_irq;
 	}

 	ret = devm_gpiochip_add_data(dev, &chip->gc, chip);
 	if (ret) {
 		dev_err(dev, "unable to add GPIO chip\n");
 		return ret;
 	}

 	return 0;
 }

 static int iproc_gpio_remove(struct platform_device *pdev)
 {
 	struct iproc_gpio_chip *chip;

 	chip = platform_get_drvdata(pdev);
 	if (!chip)
 		return -ENODEV;

 	if (chip->intr) {
 		u32 val;

 		val = readl_relaxed(chip->intr + IPROC_CCA_INT_MASK);
 		val &= ~IPROC_CCA_INT_F_GPIOINT;
 		writel_relaxed(val, chip->intr + IPROC_CCA_INT_MASK);
 	}

 	return 0;
 }

 static const struct of_device_id bcm_iproc_gpio_of_match[] = {
 	{ .compatible = "brcm,iproc-gpio-cca" },
 	{}
 };
 MODULE_DEVICE_TABLE(of, bcm_iproc_gpio_of_match);

 static struct platform_driver bcm_iproc_gpio_driver = {
 	.driver = {
 		.name = "iproc-xgs-gpio",
 		.of_match_table = bcm_iproc_gpio_of_match,
 	},
 	.probe = iproc_gpio_probe,
 	.remove = iproc_gpio_remove,
 };

 module_platform_driver(bcm_iproc_gpio_driver);

 MODULE_DESCRIPTION("XGS IPROC GPIO driver");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (C) 2017 Broadcom
	*/

	#include <linux/gpio/driver.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>
	#include <linux/irq.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/spinlock.h>

	#define IPROC_CCA_INT_F_GPIOINT BIT(0)
	#define IPROC_CCA_INT_STS 0x20
	#define IPROC_CCA_INT_MASK 0x24

	#define IPROC_GPIO_CCA_DIN 0x0
	#define IPROC_GPIO_CCA_DOUT 0x4
	#define IPROC_GPIO_CCA_OUT_EN 0x8
	#define IPROC_GPIO_CCA_INT_LEVEL 0x10
	#define IPROC_GPIO_CCA_INT_LEVEL_MASK 0x14
	#define IPROC_GPIO_CCA_INT_EVENT 0x18
	#define IPROC_GPIO_CCA_INT_EVENT_MASK 0x1C
	#define IPROC_GPIO_CCA_INT_EDGE 0x24

	struct iproc_gpio_chip {
	struct irq_chip irqchip;
	struct gpio_chip gc;
	spinlock_t lock;
	struct device *dev;
	void __iomem *base;
	void __iomem *intr;
	};

	static inline struct iproc_gpio_chip *
	to_iproc_gpio(struct gpio_chip *gc)
	{
	return container_of(gc, struct iproc_gpio_chip, gc);
	}

	static void iproc_gpio_irq_ack(struct irq_data *d)
	{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct iproc_gpio_chip *chip = to_iproc_gpio(gc);
	int pin = d->hwirq;
	unsigned long flags;
	u32 irq = d->irq;
	u32 irq_type, event_status = 0;

	spin_lock_irqsave(&chip->lock, flags);
	irq_type = irq_get_trigger_type(irq);
	if (irq_type & IRQ_TYPE_EDGE_BOTH) {
	event_status \|= BIT(pin);
	writel_relaxed(event_status,
	chip->base + IPROC_GPIO_CCA_INT_EVENT);
	}
	spin_unlock_irqrestore(&chip->lock, flags);
	}

	static void iproc_gpio_irq_unmask(struct irq_data *d)
	{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct iproc_gpio_chip *chip = to_iproc_gpio(gc);
	int pin = d->hwirq;
	unsigned long flags;
	u32 irq = d->irq;
	u32 int_mask, irq_type, event_mask;

	spin_lock_irqsave(&chip->lock, flags);
	irq_type = irq_get_trigger_type(irq);
	event_mask = readl_relaxed(chip->base + IPROC_GPIO_CCA_INT_EVENT_MASK);
	int_mask = readl_relaxed(chip->base + IPROC_GPIO_CCA_INT_LEVEL_MASK);

	if (irq_type & IRQ_TYPE_EDGE_BOTH) {
	event_mask \|= 1 << pin;
	writel_relaxed(event_mask,
	chip->base + IPROC_GPIO_CCA_INT_EVENT_MASK);
	} else {
	int_mask \|= 1 << pin;
	writel_relaxed(int_mask,
	chip->base + IPROC_GPIO_CCA_INT_LEVEL_MASK);
	}
	spin_unlock_irqrestore(&chip->lock, flags);
	}

	static void iproc_gpio_irq_mask(struct irq_data *d)
	{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct iproc_gpio_chip *chip = to_iproc_gpio(gc);
	int pin = d->hwirq;
	unsigned long flags;
	u32 irq = d->irq;
	u32 irq_type, int_mask, event_mask;

	spin_lock_irqsave(&chip->lock, flags);
	irq_type = irq_get_trigger_type(irq);
	event_mask = readl_relaxed(chip->base + IPROC_GPIO_CCA_INT_EVENT_MASK);
	int_mask = readl_relaxed(chip->base + IPROC_GPIO_CCA_INT_LEVEL_MASK);

	if (irq_type & IRQ_TYPE_EDGE_BOTH) {
	event_mask &= ~BIT(pin);
	writel_relaxed(event_mask,
	chip->base + IPROC_GPIO_CCA_INT_EVENT_MASK);
	} else {
	int_mask &= ~BIT(pin);
	writel_relaxed(int_mask,
	chip->base + IPROC_GPIO_CCA_INT_LEVEL_MASK);
	}
	spin_unlock_irqrestore(&chip->lock, flags);
	}

	static int iproc_gpio_irq_set_type(struct irq_data *d, u32 type)
	{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct iproc_gpio_chip *chip = to_iproc_gpio(gc);
	int pin = d->hwirq;
	unsigned long flags;
	u32 irq = d->irq;
	u32 event_pol, int_pol;
	int ret = 0;

	spin_lock_irqsave(&chip->lock, flags);
	switch (type & IRQ_TYPE_SENSE_MASK) {
	case IRQ_TYPE_EDGE_RISING:
	event_pol = readl_relaxed(chip->base + IPROC_GPIO_CCA_INT_EDGE);
	event_pol &= ~BIT(pin);
	writel_relaxed(event_pol, chip->base + IPROC_GPIO_CCA_INT_EDGE);
	break;
	case IRQ_TYPE_EDGE_FALLING:
	event_pol = readl_relaxed(chip->base + IPROC_GPIO_CCA_INT_EDGE);
	event_pol \|= BIT(pin);
	writel_relaxed(event_pol, chip->base + IPROC_GPIO_CCA_INT_EDGE);
	break;
	case IRQ_TYPE_LEVEL_HIGH:
	int_pol = readl_relaxed(chip->base + IPROC_GPIO_CCA_INT_LEVEL);
	int_pol &= ~BIT(pin);
	writel_relaxed(int_pol, chip->base + IPROC_GPIO_CCA_INT_LEVEL);
	break;
	case IRQ_TYPE_LEVEL_LOW:
	int_pol = readl_relaxed(chip->base + IPROC_GPIO_CCA_INT_LEVEL);
	int_pol \|= BIT(pin);
	writel_relaxed(int_pol, chip->base + IPROC_GPIO_CCA_INT_LEVEL);
	break;
	default:
	/* should not come here */
	ret = -EINVAL;
	goto out_unlock;
	}

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

	out_unlock:
	spin_unlock_irqrestore(&chip->lock, flags);

	return ret;
	}

	static irqreturn_t iproc_gpio_irq_handler(int irq, void *data)
	{
	struct gpio_chip gc = (struct gpio_chip )data;
	struct iproc_gpio_chip *chip = to_iproc_gpio(gc);
	int bit;
	unsigned long int_bits = 0;
	u32 int_status;

	/* go through the entire GPIOs and handle all interrupts */
	int_status = readl_relaxed(chip->intr + IPROC_CCA_INT_STS);
	if (int_status & IPROC_CCA_INT_F_GPIOINT) {
	u32 event, level;

	/* Get level and edge interrupts */
	event =
	readl_relaxed(chip->base + IPROC_GPIO_CCA_INT_EVENT_MASK);
	event &= readl_relaxed(chip->base + IPROC_GPIO_CCA_INT_EVENT);
	level = readl_relaxed(chip->base + IPROC_GPIO_CCA_DIN);
	level ^= readl_relaxed(chip->base + IPROC_GPIO_CCA_INT_LEVEL);
	level &=
	readl_relaxed(chip->base + IPROC_GPIO_CCA_INT_LEVEL_MASK);
	int_bits = level \| event;

	for_each_set_bit(bit, &int_bits, gc->ngpio)
	generic_handle_irq(irq_linear_revmap(gc->irq.domain, bit));
	}

	return int_bits ? IRQ_HANDLED : IRQ_NONE;
	}

	static int iproc_gpio_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct device_node *dn = pdev->dev.of_node;
	struct iproc_gpio_chip *chip;
	u32 num_gpios;
	int irq, ret;

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

	chip->dev = dev;
	platform_set_drvdata(pdev, chip);
	spin_lock_init(&chip->lock);

	chip->base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(chip->base))
	return PTR_ERR(chip->base);

	ret = bgpio_init(&chip->gc, dev, 4,
	chip->base + IPROC_GPIO_CCA_DIN,
	chip->base + IPROC_GPIO_CCA_DOUT,
	NULL,
	chip->base + IPROC_GPIO_CCA_OUT_EN,
	NULL,
	0);
	if (ret) {
	dev_err(dev, "unable to init GPIO chip\n");
	return ret;
	}

	chip->gc.label = dev_name(dev);
	if (!of_property_read_u32(dn, "ngpios", &num_gpios))
	chip->gc.ngpio = num_gpios;

	irq = platform_get_irq(pdev, 0);
	if (irq > 0) {
	struct gpio_irq_chip *girq;
	struct irq_chip *irqc;
	u32 val;

	irqc = &chip->irqchip;
	irqc->name = dev_name(dev);
	irqc->irq_ack = iproc_gpio_irq_ack;
	irqc->irq_mask = iproc_gpio_irq_mask;
	irqc->irq_unmask = iproc_gpio_irq_unmask;
	irqc->irq_set_type = iproc_gpio_irq_set_type;

	chip->intr = devm_platform_ioremap_resource(pdev, 1);
	if (IS_ERR(chip->intr))
	return PTR_ERR(chip->intr);

	/* Enable GPIO interrupts for CCA GPIO */
	val = readl_relaxed(chip->intr + IPROC_CCA_INT_MASK);
	val \|= IPROC_CCA_INT_F_GPIOINT;
	writel_relaxed(val, chip->intr + IPROC_CCA_INT_MASK);

	/*
	* Directly request the irq here instead of passing
	* a flow-handler because the irq is shared.
	*/
	ret = devm_request_irq(dev, irq, iproc_gpio_irq_handler,
	IRQF_SHARED, chip->gc.label, &chip->gc);
	if (ret) {
	dev_err(dev, "Fail to request IRQ%d: %d\n", irq, ret);
	return ret;
	}

	girq = &chip->gc.irq;
	girq->chip = irqc;
	/* 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_simple_irq;
	}

	ret = devm_gpiochip_add_data(dev, &chip->gc, chip);
	if (ret) {
	dev_err(dev, "unable to add GPIO chip\n");
	return ret;
	}

	return 0;
	}

	static int iproc_gpio_remove(struct platform_device *pdev)
	{
	struct iproc_gpio_chip *chip;

	chip = platform_get_drvdata(pdev);
	if (!chip)
	return -ENODEV;

	if (chip->intr) {
	u32 val;

	val = readl_relaxed(chip->intr + IPROC_CCA_INT_MASK);
	val &= ~IPROC_CCA_INT_F_GPIOINT;
	writel_relaxed(val, chip->intr + IPROC_CCA_INT_MASK);
	}

	return 0;
	}

	static const struct of_device_id bcm_iproc_gpio_of_match[] = {
	{ .compatible = "brcm,iproc-gpio-cca" },
	{}
	};
	MODULE_DEVICE_TABLE(of, bcm_iproc_gpio_of_match);

	static struct platform_driver bcm_iproc_gpio_driver = {
	.driver = {
	.name = "iproc-xgs-gpio",
	.of_match_table = bcm_iproc_gpio_of_match,
	},
	.probe = iproc_gpio_probe,
	.remove = iproc_gpio_remove,
	};

	module_platform_driver(bcm_iproc_gpio_driver);

	MODULE_DESCRIPTION("XGS IPROC GPIO driver");
	MODULE_LICENSE("GPL v2");