[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / gpio / gpio-mxs.c

/*
 * MXC GPIO support. (c) 2008 Daniel Mack <daniel@caiaq.de>
 * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
 *
 * Based on code from Freescale,
 * Copyright (C) 2004-2010 Freescale Semiconductor, Inc. All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA  02110-1301, USA.
 */

#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/gpio.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/basic_mmio_gpio.h>
#include <linux/module.h>

#define MXS_SET		0x4
#define MXS_CLR		0x8

#define PINCTRL_DOUT(p)		((is_imx23_gpio(p) ? 0x0500 : 0x0700) + (p->id) * 0x10)
#define PINCTRL_DIN(p)		((is_imx23_gpio(p) ? 0x0600 : 0x0900) + (p->id) * 0x10)
#define PINCTRL_DOE(p)		((is_imx23_gpio(p) ? 0x0700 : 0x0b00) + (p->id) * 0x10)
#define PINCTRL_PIN2IRQ(p)	((is_imx23_gpio(p) ? 0x0800 : 0x1000) + (p->id) * 0x10)
#define PINCTRL_IRQEN(p)	((is_imx23_gpio(p) ? 0x0900 : 0x1100) + (p->id) * 0x10)
#define PINCTRL_IRQLEV(p)	((is_imx23_gpio(p) ? 0x0a00 : 0x1200) + (p->id) * 0x10)
#define PINCTRL_IRQPOL(p)	((is_imx23_gpio(p) ? 0x0b00 : 0x1300) + (p->id) * 0x10)
#define PINCTRL_IRQSTAT(p)	((is_imx23_gpio(p) ? 0x0c00 : 0x1400) + (p->id) * 0x10)

#define GPIO_INT_FALL_EDGE	0x0
#define GPIO_INT_LOW_LEV	0x1
#define GPIO_INT_RISE_EDGE	0x2
#define GPIO_INT_HIGH_LEV	0x3
#define GPIO_INT_LEV_MASK	(1 << 0)
#define GPIO_INT_POL_MASK	(1 << 1)

enum mxs_gpio_id {
	IMX23_GPIO,
	IMX28_GPIO,
};

struct mxs_gpio_port {
	void __iomem *base;
	int id;
	int irq;
	struct irq_domain *domain;
	struct bgpio_chip bgc;
	enum mxs_gpio_id devid;
};

static inline int is_imx23_gpio(struct mxs_gpio_port *port)
{
	return port->devid == IMX23_GPIO;
}

static inline int is_imx28_gpio(struct mxs_gpio_port *port)
{
	return port->devid == IMX28_GPIO;
}

/* Note: This driver assumes 32 GPIOs are handled in one register */

static int mxs_gpio_set_irq_type(struct irq_data *d, unsigned int type)
{
	u32 pin_mask = 1 << d->hwirq;
	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
	struct mxs_gpio_port *port = gc->private;
	void __iomem *pin_addr;
	int edge;

	switch (type) {
	case IRQ_TYPE_EDGE_RISING:
		edge = GPIO_INT_RISE_EDGE;
		break;
	case IRQ_TYPE_EDGE_FALLING:
		edge = GPIO_INT_FALL_EDGE;
		break;
	case IRQ_TYPE_LEVEL_LOW:
		edge = GPIO_INT_LOW_LEV;
		break;
	case IRQ_TYPE_LEVEL_HIGH:
		edge = GPIO_INT_HIGH_LEV;
		break;
	default:
		return -EINVAL;
	}

	/* set level or edge */
	pin_addr = port->base + PINCTRL_IRQLEV(port);
	if (edge & GPIO_INT_LEV_MASK)
		writel(pin_mask, pin_addr + MXS_SET);
	else
		writel(pin_mask, pin_addr + MXS_CLR);

	/* set polarity */
	pin_addr = port->base + PINCTRL_IRQPOL(port);
	if (edge & GPIO_INT_POL_MASK)
		writel(pin_mask, pin_addr + MXS_SET);
	else
		writel(pin_mask, pin_addr + MXS_CLR);

	writel(pin_mask,
	       port->base + PINCTRL_IRQSTAT(port) + MXS_CLR);

	return 0;
}

/* MXS has one interrupt *per* gpio port */
static void mxs_gpio_irq_handler(u32 irq, struct irq_desc *desc)
{
	u32 irq_stat;
	struct mxs_gpio_port *port = irq_get_handler_data(irq);

	desc->irq_data.chip->irq_ack(&desc->irq_data);

	irq_stat = readl(port->base + PINCTRL_IRQSTAT(port)) &
			readl(port->base + PINCTRL_IRQEN(port));

	while (irq_stat != 0) {
		int irqoffset = fls(irq_stat) - 1;
		generic_handle_irq(irq_find_mapping(port->domain, irqoffset));
		irq_stat &= ~(1 << irqoffset);
	}
}

/*
 * Set interrupt number "irq" in the GPIO as a wake-up source.
 * While system is running, all registered GPIO interrupts need to have
 * wake-up enabled. When system is suspended, only selected GPIO interrupts
 * need to have wake-up enabled.
 * @param  irq          interrupt source number
 * @param  enable       enable as wake-up if equal to non-zero
 * @return       This function returns 0 on success.
 */
static int mxs_gpio_set_wake_irq(struct irq_data *d, unsigned int enable)
{
	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
	struct mxs_gpio_port *port = gc->private;

	if (enable)
		enable_irq_wake(port->irq);
	else
		disable_irq_wake(port->irq);

	return 0;
}

static void __init mxs_gpio_init_gc(struct mxs_gpio_port *port, int irq_base)
{
	struct irq_chip_generic *gc;
	struct irq_chip_type *ct;

	gc = irq_alloc_generic_chip("gpio-mxs", 1, irq_base,
				    port->base, handle_level_irq);
	gc->private = port;

	ct = gc->chip_types;
	ct->chip.irq_ack = irq_gc_ack_set_bit;
	ct->chip.irq_mask = irq_gc_mask_clr_bit;
	ct->chip.irq_unmask = irq_gc_mask_set_bit;
	ct->chip.irq_set_type = mxs_gpio_set_irq_type;
	ct->chip.irq_set_wake = mxs_gpio_set_wake_irq;
	ct->regs.ack = PINCTRL_IRQSTAT(port) + MXS_CLR;
	ct->regs.mask = PINCTRL_IRQEN(port);

	irq_setup_generic_chip(gc, IRQ_MSK(32), 0, IRQ_NOREQUEST, 0);
}

static int mxs_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
{
	struct bgpio_chip *bgc = to_bgpio_chip(gc);
	struct mxs_gpio_port *port =
		container_of(bgc, struct mxs_gpio_port, bgc);

	return irq_find_mapping(port->domain, offset);
}

static struct platform_device_id mxs_gpio_ids[] = {
	{
		.name = "imx23-gpio",
		.driver_data = IMX23_GPIO,
	}, {
		.name = "imx28-gpio",
		.driver_data = IMX28_GPIO,
	}, {
		/* sentinel */
	}
};
MODULE_DEVICE_TABLE(platform, mxs_gpio_ids);

static const struct of_device_id mxs_gpio_dt_ids[] = {
	{ .compatible = "fsl,imx23-gpio", .data = (void *) IMX23_GPIO, },
	{ .compatible = "fsl,imx28-gpio", .data = (void *) IMX28_GPIO, },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mxs_gpio_dt_ids);

static int mxs_gpio_probe(struct platform_device *pdev)
{
	const struct of_device_id *of_id =
			of_match_device(mxs_gpio_dt_ids, &pdev->dev);
	struct device_node *np = pdev->dev.of_node;
	struct device_node *parent;
	static void __iomem *base;
	struct mxs_gpio_port *port;
	struct resource *iores = NULL;
	int irq_base;
	int err;

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

	if (np) {
		port->id = of_alias_get_id(np, "gpio");
		if (port->id < 0)
			return port->id;
		port->devid = (enum mxs_gpio_id) of_id->data;
	} else {
		port->id = pdev->id;
		port->devid = pdev->id_entry->driver_data;
	}

	port->irq = platform_get_irq(pdev, 0);
	if (port->irq < 0)
		return port->irq;

	/*
	 * map memory region only once, as all the gpio ports
	 * share the same one
	 */
	if (!base) {
		if (np) {
			parent = of_get_parent(np);
			base = of_iomap(parent, 0);
			of_node_put(parent);
		} else {
			iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
			base = devm_request_and_ioremap(&pdev->dev, iores);
		}
		if (!base)
			return -EADDRNOTAVAIL;
	}
	port->base = base;

	/*
	 * select the pin interrupt functionality but initially
	 * disable the interrupts
	 */
	writel(~0U, port->base + PINCTRL_PIN2IRQ(port));
	writel(0, port->base + PINCTRL_IRQEN(port));

	/* clear address has to be used to clear IRQSTAT bits */
	writel(~0U, port->base + PINCTRL_IRQSTAT(port) + MXS_CLR);

	irq_base = irq_alloc_descs(-1, 0, 32, numa_node_id());
	if (irq_base < 0)
		return irq_base;

	port->domain = irq_domain_add_legacy(np, 32, irq_base, 0,
					     &irq_domain_simple_ops, NULL);
	if (!port->domain) {
		err = -ENODEV;
		goto out_irqdesc_free;
	}

	/* gpio-mxs can be a generic irq chip */
	mxs_gpio_init_gc(port, irq_base);

	/* setup one handler for each entry */
	irq_set_chained_handler(port->irq, mxs_gpio_irq_handler);
	irq_set_handler_data(port->irq, port);

	err = bgpio_init(&port->bgc, &pdev->dev, 4,
			 port->base + PINCTRL_DIN(port),
			 port->base + PINCTRL_DOUT(port), NULL,
			 port->base + PINCTRL_DOE(port), NULL, 0);
	if (err)
		goto out_irqdesc_free;

	port->bgc.gc.to_irq = mxs_gpio_to_irq;
	port->bgc.gc.base = port->id * 32;

	err = gpiochip_add(&port->bgc.gc);
	if (err)
		goto out_bgpio_remove;

	return 0;

out_bgpio_remove:
	bgpio_remove(&port->bgc);
out_irqdesc_free:
	irq_free_descs(irq_base, 32);
	return err;
}

static struct platform_driver mxs_gpio_driver = {
	.driver		= {
		.name	= "gpio-mxs",
		.owner	= THIS_MODULE,
		.of_match_table = mxs_gpio_dt_ids,
	},
	.probe		= mxs_gpio_probe,
	.id_table	= mxs_gpio_ids,
};

static int __init mxs_gpio_init(void)
{
	return platform_driver_register(&mxs_gpio_driver);
}
postcore_initcall(mxs_gpio_init);

MODULE_AUTHOR("Freescale Semiconductor, "
	      "Daniel Mack <danielncaiaq.de>, "
	      "Juergen Beisert <kernel@pengutronix.de>");
MODULE_DESCRIPTION("Freescale MXS GPIO");
MODULE_LICENSE("GPL");
Commit	Line	Data
	1	/*
	2	* MXC GPIO support. (c) 2008 Daniel Mack <daniel@caiaq.de>
	3	* Copyright 2008 Juergen Beisert, kernel@pengutronix.de
	4	*
	5	* Based on code from Freescale,
	6	* Copyright (C) 2004-2010 Freescale Semiconductor, Inc. All Rights Reserved.
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* as published by the Free Software Foundation; either version 2
	11	* of the License, or (at your option) any later version.
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
	20	* MA 02110-1301, USA.
	21	*/
	22
	23	#include <linux/init.h>
	24	#include <linux/interrupt.h>
	25	#include <linux/io.h>
	26	#include <linux/irq.h>
	27	#include <linux/irqdomain.h>
	28	#include <linux/gpio.h>
	29	#include <linux/of.h>
	30	#include <linux/of_address.h>
	31	#include <linux/of_device.h>
	32	#include <linux/platform_device.h>
	33	#include <linux/slab.h>
	34	#include <linux/basic_mmio_gpio.h>
	35	#include <linux/module.h>
	36
	37	#define MXS_SET 0x4
	38	#define MXS_CLR 0x8
	39
	40	#define PINCTRL_DOUT(p) ((is_imx23_gpio(p) ? 0x0500 : 0x0700) + (p->id) * 0x10)
	41	#define PINCTRL_DIN(p) ((is_imx23_gpio(p) ? 0x0600 : 0x0900) + (p->id) * 0x10)
	42	#define PINCTRL_DOE(p) ((is_imx23_gpio(p) ? 0x0700 : 0x0b00) + (p->id) * 0x10)
	43	#define PINCTRL_PIN2IRQ(p) ((is_imx23_gpio(p) ? 0x0800 : 0x1000) + (p->id) * 0x10)
	44	#define PINCTRL_IRQEN(p) ((is_imx23_gpio(p) ? 0x0900 : 0x1100) + (p->id) * 0x10)
	45	#define PINCTRL_IRQLEV(p) ((is_imx23_gpio(p) ? 0x0a00 : 0x1200) + (p->id) * 0x10)
	46	#define PINCTRL_IRQPOL(p) ((is_imx23_gpio(p) ? 0x0b00 : 0x1300) + (p->id) * 0x10)
	47	#define PINCTRL_IRQSTAT(p) ((is_imx23_gpio(p) ? 0x0c00 : 0x1400) + (p->id) * 0x10)
	48
	49	#define GPIO_INT_FALL_EDGE 0x0
	50	#define GPIO_INT_LOW_LEV 0x1
	51	#define GPIO_INT_RISE_EDGE 0x2
	52	#define GPIO_INT_HIGH_LEV 0x3
	53	#define GPIO_INT_LEV_MASK (1 << 0)
	54	#define GPIO_INT_POL_MASK (1 << 1)
	55
	56	enum mxs_gpio_id {
	57	IMX23_GPIO,
	58	IMX28_GPIO,
	59	};
	60
	61	struct mxs_gpio_port {
	62	void __iomem *base;
	63	int id;
	64	int irq;
	65	struct irq_domain *domain;
	66	struct bgpio_chip bgc;
	67	enum mxs_gpio_id devid;
	68	};
	69
	70	static inline int is_imx23_gpio(struct mxs_gpio_port *port)
	71	{
	72	return port->devid == IMX23_GPIO;
	73	}
	74
	75	static inline int is_imx28_gpio(struct mxs_gpio_port *port)
	76	{
	77	return port->devid == IMX28_GPIO;
	78	}
	79
	80	/* Note: This driver assumes 32 GPIOs are handled in one register */
	81
	82	static int mxs_gpio_set_irq_type(struct irq_data *d, unsigned int type)
	83	{
	84	u32 pin_mask = 1 << d->hwirq;
	85	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
	86	struct mxs_gpio_port *port = gc->private;
	87	void __iomem *pin_addr;
	88	int edge;
	89
	90	switch (type) {
	91	case IRQ_TYPE_EDGE_RISING:
	92	edge = GPIO_INT_RISE_EDGE;
	93	break;
	94	case IRQ_TYPE_EDGE_FALLING:
	95	edge = GPIO_INT_FALL_EDGE;
	96	break;
	97	case IRQ_TYPE_LEVEL_LOW:
	98	edge = GPIO_INT_LOW_LEV;
	99	break;
	100	case IRQ_TYPE_LEVEL_HIGH:
	101	edge = GPIO_INT_HIGH_LEV;
	102	break;
	103	default:
	104	return -EINVAL;
	105	}
	106
	107	/* set level or edge */
	108	pin_addr = port->base + PINCTRL_IRQLEV(port);
	109	if (edge & GPIO_INT_LEV_MASK)
	110	writel(pin_mask, pin_addr + MXS_SET);
	111	else
	112	writel(pin_mask, pin_addr + MXS_CLR);
	113
	114	/* set polarity */
	115	pin_addr = port->base + PINCTRL_IRQPOL(port);
	116	if (edge & GPIO_INT_POL_MASK)
	117	writel(pin_mask, pin_addr + MXS_SET);
	118	else
	119	writel(pin_mask, pin_addr + MXS_CLR);
	120
	121	writel(pin_mask,
	122	port->base + PINCTRL_IRQSTAT(port) + MXS_CLR);
	123
	124	return 0;
	125	}
	126
	127	/* MXS has one interrupt per gpio port */
	128	static void mxs_gpio_irq_handler(u32 irq, struct irq_desc *desc)
	129	{
	130	u32 irq_stat;
	131	struct mxs_gpio_port *port = irq_get_handler_data(irq);
	132
	133	desc->irq_data.chip->irq_ack(&desc->irq_data);
	134
	135	irq_stat = readl(port->base + PINCTRL_IRQSTAT(port)) &
	136	readl(port->base + PINCTRL_IRQEN(port));
	137
	138	while (irq_stat != 0) {
	139	int irqoffset = fls(irq_stat) - 1;
	140	generic_handle_irq(irq_find_mapping(port->domain, irqoffset));
	141	irq_stat &= ~(1 << irqoffset);
	142	}
	143	}
	144
	145	/*
	146	* Set interrupt number "irq" in the GPIO as a wake-up source.
	147	* While system is running, all registered GPIO interrupts need to have
	148	* wake-up enabled. When system is suspended, only selected GPIO interrupts
	149	* need to have wake-up enabled.
	150	* @param irq interrupt source number
	151	* @param enable enable as wake-up if equal to non-zero
	152	* @return This function returns 0 on success.
	153	*/
	154	static int mxs_gpio_set_wake_irq(struct irq_data *d, unsigned int enable)
	155	{
	156	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
	157	struct mxs_gpio_port *port = gc->private;
	158
	159	if (enable)
	160	enable_irq_wake(port->irq);
	161	else
	162	disable_irq_wake(port->irq);
	163
	164	return 0;
	165	}
	166
	167	static void __init mxs_gpio_init_gc(struct mxs_gpio_port *port, int irq_base)
	168	{
	169	struct irq_chip_generic *gc;
	170	struct irq_chip_type *ct;
	171
	172	gc = irq_alloc_generic_chip("gpio-mxs", 1, irq_base,
	173	port->base, handle_level_irq);
	174	gc->private = port;
	175
	176	ct = gc->chip_types;
	177	ct->chip.irq_ack = irq_gc_ack_set_bit;
	178	ct->chip.irq_mask = irq_gc_mask_clr_bit;
	179	ct->chip.irq_unmask = irq_gc_mask_set_bit;
	180	ct->chip.irq_set_type = mxs_gpio_set_irq_type;
	181	ct->chip.irq_set_wake = mxs_gpio_set_wake_irq;
	182	ct->regs.ack = PINCTRL_IRQSTAT(port) + MXS_CLR;
	183	ct->regs.mask = PINCTRL_IRQEN(port);
	184
	185	irq_setup_generic_chip(gc, IRQ_MSK(32), 0, IRQ_NOREQUEST, 0);
	186	}
	187
	188	static int mxs_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
	189	{
	190	struct bgpio_chip *bgc = to_bgpio_chip(gc);
	191	struct mxs_gpio_port *port =
	192	container_of(bgc, struct mxs_gpio_port, bgc);
	193
	194	return irq_find_mapping(port->domain, offset);
	195	}
	196
	197	static struct platform_device_id mxs_gpio_ids[] = {
	198	{
	199	.name = "imx23-gpio",
	200	.driver_data = IMX23_GPIO,
	201	}, {
	202	.name = "imx28-gpio",
	203	.driver_data = IMX28_GPIO,
	204	}, {
	205	/* sentinel */
	206	}
	207	};
	208	MODULE_DEVICE_TABLE(platform, mxs_gpio_ids);
	209
	210	static const struct of_device_id mxs_gpio_dt_ids[] = {
	211	{ .compatible = "fsl,imx23-gpio", .data = (void *) IMX23_GPIO, },
	212	{ .compatible = "fsl,imx28-gpio", .data = (void *) IMX28_GPIO, },
	213	{ /* sentinel */ }
	214	};
	215	MODULE_DEVICE_TABLE(of, mxs_gpio_dt_ids);
	216
	217	static int mxs_gpio_probe(struct platform_device *pdev)
	218	{
	219	const struct of_device_id *of_id =
	220	of_match_device(mxs_gpio_dt_ids, &pdev->dev);
	221	struct device_node *np = pdev->dev.of_node;
	222	struct device_node *parent;
	223	static void __iomem *base;
	224	struct mxs_gpio_port *port;
	225	struct resource *iores = NULL;
	226	int irq_base;
	227	int err;
	228
	229	port = devm_kzalloc(&pdev->dev, sizeof(*port), GFP_KERNEL);
	230	if (!port)
	231	return -ENOMEM;
	232
	233	if (np) {
	234	port->id = of_alias_get_id(np, "gpio");
	235	if (port->id < 0)
	236	return port->id;
	237	port->devid = (enum mxs_gpio_id) of_id->data;
	238	} else {
	239	port->id = pdev->id;
	240	port->devid = pdev->id_entry->driver_data;
	241	}
	242
	243	port->irq = platform_get_irq(pdev, 0);
	244	if (port->irq < 0)
	245	return port->irq;
	246
	247	/*
	248	* map memory region only once, as all the gpio ports
	249	* share the same one
	250	*/
	251	if (!base) {
	252	if (np) {
	253	parent = of_get_parent(np);
	254	base = of_iomap(parent, 0);
	255	of_node_put(parent);
	256	} else {
	257	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	258	base = devm_request_and_ioremap(&pdev->dev, iores);
	259	}
	260	if (!base)
	261	return -EADDRNOTAVAIL;
	262	}
	263	port->base = base;
	264
	265	/*
	266	* select the pin interrupt functionality but initially
	267	* disable the interrupts
	268	*/
	269	writel(~0U, port->base + PINCTRL_PIN2IRQ(port));
	270	writel(0, port->base + PINCTRL_IRQEN(port));
	271
	272	/* clear address has to be used to clear IRQSTAT bits */
	273	writel(~0U, port->base + PINCTRL_IRQSTAT(port) + MXS_CLR);
	274
	275	irq_base = irq_alloc_descs(-1, 0, 32, numa_node_id());
	276	if (irq_base < 0)
	277	return irq_base;
	278
	279	port->domain = irq_domain_add_legacy(np, 32, irq_base, 0,
	280	&irq_domain_simple_ops, NULL);
	281	if (!port->domain) {
	282	err = -ENODEV;
	283	goto out_irqdesc_free;
	284	}
	285
	286	/* gpio-mxs can be a generic irq chip */
	287	mxs_gpio_init_gc(port, irq_base);
	288
	289	/* setup one handler for each entry */
	290	irq_set_chained_handler(port->irq, mxs_gpio_irq_handler);
	291	irq_set_handler_data(port->irq, port);
	292
	293	err = bgpio_init(&port->bgc, &pdev->dev, 4,
	294	port->base + PINCTRL_DIN(port),
	295	port->base + PINCTRL_DOUT(port), NULL,
	296	port->base + PINCTRL_DOE(port), NULL, 0);
	297	if (err)
	298	goto out_irqdesc_free;
	299
	300	port->bgc.gc.to_irq = mxs_gpio_to_irq;
	301	port->bgc.gc.base = port->id * 32;
	302
	303	err = gpiochip_add(&port->bgc.gc);
	304	if (err)
	305	goto out_bgpio_remove;
	306
	307	return 0;
	308
	309	out_bgpio_remove:
	310	bgpio_remove(&port->bgc);
	311	out_irqdesc_free:
	312	irq_free_descs(irq_base, 32);
	313	return err;
	314	}
	315
	316	static struct platform_driver mxs_gpio_driver = {
	317	.driver = {
	318	.name = "gpio-mxs",
	319	.owner = THIS_MODULE,
	320	.of_match_table = mxs_gpio_dt_ids,
	321	},
	322	.probe = mxs_gpio_probe,
	323	.id_table = mxs_gpio_ids,
	324	};
	325
	326	static int __init mxs_gpio_init(void)
	327	{
	328	return platform_driver_register(&mxs_gpio_driver);
	329	}
	330	postcore_initcall(mxs_gpio_init);
	331
	332	MODULE_AUTHOR("Freescale Semiconductor, "
	333	"Daniel Mack <danielncaiaq.de>, "
	334	"Juergen Beisert <kernel@pengutronix.de>");
	335	MODULE_DESCRIPTION("Freescale MXS GPIO");
	336	MODULE_LICENSE("GPL");