[people/ms/u-boot.git] / drivers / gpio / s5p_gpio.c

/*
 * (C) Copyright 2009 Samsung Electronics
 * Minkyu Kang <mk7.kang@samsung.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <dm.h>
#include <errno.h>
#include <fdtdec.h>
#include <malloc.h>
#include <asm/io.h>
#include <asm/gpio.h>
#include <dm/device-internal.h>

DECLARE_GLOBAL_DATA_PTR;

#define S5P_GPIO_GET_PIN(x)	(x % GPIO_PER_BANK)

#define CON_MASK(val)			(0xf << ((val) << 2))
#define CON_SFR(gpio, cfg)		((cfg) << ((gpio) << 2))
#define CON_SFR_UNSHIFT(val, gpio)	((val) >> ((gpio) << 2))

#define DAT_MASK(gpio)			(0x1 << (gpio))
#define DAT_SET(gpio)			(0x1 << (gpio))

#define PULL_MASK(gpio)		(0x3 << ((gpio) << 1))
#define PULL_MODE(gpio, pull)		((pull) << ((gpio) << 1))

#define DRV_MASK(gpio)			(0x3 << ((gpio) << 1))
#define DRV_SET(gpio, mode)		((mode) << ((gpio) << 1))
#define RATE_MASK(gpio)		(0x1 << (gpio + 16))
#define RATE_SET(gpio)			(0x1 << (gpio + 16))

/* Platform data for each bank */
struct exynos_gpio_platdata {
	struct s5p_gpio_bank *bank;
	const char *bank_name;	/* Name of port, e.g. 'gpa0" */
};

/* Information about each bank at run-time */
struct exynos_bank_info {
	struct s5p_gpio_bank *bank;
};

static struct s5p_gpio_bank *s5p_gpio_get_bank(unsigned int gpio)
{
	const struct gpio_info *data;
	unsigned int upto;
	int i, count;

	data = get_gpio_data();
	count = get_bank_num();
	upto = 0;

	for (i = 0; i < count; i++) {
		debug("i=%d, upto=%d\n", i, upto);
		if (gpio < data->max_gpio) {
			struct s5p_gpio_bank *bank;
			bank = (struct s5p_gpio_bank *)data->reg_addr;
			bank += (gpio - upto) / GPIO_PER_BANK;
			debug("gpio=%d, bank=%p\n", gpio, bank);
			return bank;
		}

		upto = data->max_gpio;
		data++;
	}

	return NULL;
}

static void s5p_gpio_cfg_pin(struct s5p_gpio_bank *bank, int gpio, int cfg)
{
	unsigned int value;

	value = readl(&bank->con);
	value &= ~CON_MASK(gpio);
	value |= CON_SFR(gpio, cfg);
	writel(value, &bank->con);
}

static void s5p_gpio_set_value(struct s5p_gpio_bank *bank, int gpio, int en)
{
	unsigned int value;

	value = readl(&bank->dat);
	value &= ~DAT_MASK(gpio);
	if (en)
		value |= DAT_SET(gpio);
	writel(value, &bank->dat);
}

#ifdef CONFIG_SPL_BUILD
/* Common GPIO API - SPL does not support driver model yet */
int gpio_set_value(unsigned gpio, int value)
{
	s5p_gpio_set_value(s5p_gpio_get_bank(gpio),
			   s5p_gpio_get_pin(gpio), value);

	return 0;
}
#else
static int s5p_gpio_get_cfg_pin(struct s5p_gpio_bank *bank, int gpio)
{
	unsigned int value;

	value = readl(&bank->con);
	value &= CON_MASK(gpio);
	return CON_SFR_UNSHIFT(value, gpio);
}

static unsigned int s5p_gpio_get_value(struct s5p_gpio_bank *bank, int gpio)
{
	unsigned int value;

	value = readl(&bank->dat);
	return !!(value & DAT_MASK(gpio));
}
#endif /* CONFIG_SPL_BUILD */

static void s5p_gpio_set_pull(struct s5p_gpio_bank *bank, int gpio, int mode)
{
	unsigned int value;

	value = readl(&bank->pull);
	value &= ~PULL_MASK(gpio);

	switch (mode) {
	case S5P_GPIO_PULL_DOWN:
	case S5P_GPIO_PULL_UP:
		value |= PULL_MODE(gpio, mode);
		break;
	default:
		break;
	}

	writel(value, &bank->pull);
}

static void s5p_gpio_set_drv(struct s5p_gpio_bank *bank, int gpio, int mode)
{
	unsigned int value;

	value = readl(&bank->drv);
	value &= ~DRV_MASK(gpio);

	switch (mode) {
	case S5P_GPIO_DRV_1X:
	case S5P_GPIO_DRV_2X:
	case S5P_GPIO_DRV_3X:
	case S5P_GPIO_DRV_4X:
		value |= DRV_SET(gpio, mode);
		break;
	default:
		return;
	}

	writel(value, &bank->drv);
}

static void s5p_gpio_set_rate(struct s5p_gpio_bank *bank, int gpio, int mode)
{
	unsigned int value;

	value = readl(&bank->drv);
	value &= ~RATE_MASK(gpio);

	switch (mode) {
	case S5P_GPIO_DRV_FAST:
	case S5P_GPIO_DRV_SLOW:
		value |= RATE_SET(gpio);
		break;
	default:
		return;
	}

	writel(value, &bank->drv);
}

int s5p_gpio_get_pin(unsigned gpio)
{
	return S5P_GPIO_GET_PIN(gpio);
}

/* Driver model interface */
#ifndef CONFIG_SPL_BUILD
/* set GPIO pin 'gpio' as an input */
static int exynos_gpio_direction_input(struct udevice *dev, unsigned offset)
{
	struct exynos_bank_info *state = dev_get_priv(dev);

	/* Configure GPIO direction as input. */
	s5p_gpio_cfg_pin(state->bank, offset, S5P_GPIO_INPUT);

	return 0;
}

/* set GPIO pin 'gpio' as an output, with polarity 'value' */
static int exynos_gpio_direction_output(struct udevice *dev, unsigned offset,
				       int value)
{
	struct exynos_bank_info *state = dev_get_priv(dev);

	/* Configure GPIO output value. */
	s5p_gpio_set_value(state->bank, offset, value);

	/* Configure GPIO direction as output. */
	s5p_gpio_cfg_pin(state->bank, offset, S5P_GPIO_OUTPUT);

	return 0;
}

/* read GPIO IN value of pin 'gpio' */
static int exynos_gpio_get_value(struct udevice *dev, unsigned offset)
{
	struct exynos_bank_info *state = dev_get_priv(dev);

	return s5p_gpio_get_value(state->bank, offset);
}

/* write GPIO OUT value to pin 'gpio' */
static int exynos_gpio_set_value(struct udevice *dev, unsigned offset,
				 int value)
{
	struct exynos_bank_info *state = dev_get_priv(dev);

	s5p_gpio_set_value(state->bank, offset, value);

	return 0;
}
#endif /* nCONFIG_SPL_BUILD */

/*
 * There is no common GPIO API for pull, drv, pin, rate (yet). These
 * functions are kept here to preserve function ordering for review.
 */
void gpio_set_pull(int gpio, int mode)
{
	s5p_gpio_set_pull(s5p_gpio_get_bank(gpio),
			  s5p_gpio_get_pin(gpio), mode);
}

void gpio_set_drv(int gpio, int mode)
{
	s5p_gpio_set_drv(s5p_gpio_get_bank(gpio),
			 s5p_gpio_get_pin(gpio), mode);
}

void gpio_cfg_pin(int gpio, int cfg)
{
	s5p_gpio_cfg_pin(s5p_gpio_get_bank(gpio),
			 s5p_gpio_get_pin(gpio), cfg);
}

void gpio_set_rate(int gpio, int mode)
{
	s5p_gpio_set_rate(s5p_gpio_get_bank(gpio),
			  s5p_gpio_get_pin(gpio), mode);
}

#ifndef CONFIG_SPL_BUILD
static int exynos_gpio_get_function(struct udevice *dev, unsigned offset)
{
	struct exynos_bank_info *state = dev_get_priv(dev);
	int cfg;

	cfg = s5p_gpio_get_cfg_pin(state->bank, offset);
	if (cfg == S5P_GPIO_OUTPUT)
		return GPIOF_OUTPUT;
	else if (cfg == S5P_GPIO_INPUT)
		return GPIOF_INPUT;
	else
		return GPIOF_FUNC;
}

static const struct dm_gpio_ops gpio_exynos_ops = {
	.direction_input	= exynos_gpio_direction_input,
	.direction_output	= exynos_gpio_direction_output,
	.get_value		= exynos_gpio_get_value,
	.set_value		= exynos_gpio_set_value,
	.get_function		= exynos_gpio_get_function,
};

static int gpio_exynos_probe(struct udevice *dev)
{
	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
	struct exynos_bank_info *priv = dev->priv;
	struct exynos_gpio_platdata *plat = dev->platdata;

	/* Only child devices have ports */
	if (!plat)
		return 0;

	priv->bank = plat->bank;

	uc_priv->gpio_count = GPIO_PER_BANK;
	uc_priv->bank_name = plat->bank_name;

	return 0;
}

/**
 * We have a top-level GPIO device with no actual GPIOs. It has a child
 * device for each Exynos GPIO bank.
 */
static int gpio_exynos_bind(struct udevice *parent)
{
	struct exynos_gpio_platdata *plat = parent->platdata;
	struct s5p_gpio_bank *bank, *base;
	const void *blob = gd->fdt_blob;
	int node;

	/* If this is a child device, there is nothing to do here */
	if (plat)
		return 0;

	base = (struct s5p_gpio_bank *)devfdt_get_addr(parent);
	for (node = fdt_first_subnode(blob, dev_of_offset(parent)), bank = base;
	     node > 0;
	     node = fdt_next_subnode(blob, node), bank++) {
		struct exynos_gpio_platdata *plat;
		struct udevice *dev;
		fdt_addr_t reg;
		int ret;

		if (!fdtdec_get_bool(blob, node, "gpio-controller"))
			continue;
		plat = calloc(1, sizeof(*plat));
		if (!plat)
			return -ENOMEM;

		plat->bank_name = fdt_get_name(blob, node, NULL);
		ret = device_bind(parent, parent->driver,
				  plat->bank_name, plat, -1, &dev);
		if (ret)
			return ret;

		dev_set_of_offset(dev, node);

		reg = devfdt_get_addr(dev);
		if (reg != FDT_ADDR_T_NONE)
			bank = (struct s5p_gpio_bank *)((ulong)base + reg);

		plat->bank = bank;

		debug("dev at %p: %s\n", bank, plat->bank_name);
	}

	return 0;
}

static const struct udevice_id exynos_gpio_ids[] = {
	{ .compatible = "samsung,s5pc100-pinctrl" },
	{ .compatible = "samsung,s5pc110-pinctrl" },
	{ .compatible = "samsung,exynos4210-pinctrl" },
	{ .compatible = "samsung,exynos4x12-pinctrl" },
	{ .compatible = "samsung,exynos5250-pinctrl" },
	{ .compatible = "samsung,exynos5420-pinctrl" },
	{ }
};

U_BOOT_DRIVER(gpio_exynos) = {
	.name	= "gpio_exynos",
	.id	= UCLASS_GPIO,
	.of_match = exynos_gpio_ids,
	.bind	= gpio_exynos_bind,
	.probe = gpio_exynos_probe,
	.priv_auto_alloc_size = sizeof(struct exynos_bank_info),
	.ops	= &gpio_exynos_ops,
};
#endif
Commit	Line	Data
ab693e9c MK	1	/*
	2	* (C) Copyright 2009 Samsung Electronics
	3	* Minkyu Kang <mk7.kang@samsung.com>
	4	*
1a459660	5	* SPDX-License-Identifier: GPL-2.0+
ab693e9c MK	6	*/
	7
	8	#include <common.h>
b8809e60 SG	9	#include <dm.h>
	10	#include <errno.h>
	11	#include <fdtdec.h>
	12	#include <malloc.h>
ab693e9c	13	#include <asm/io.h>
365d6070	14	#include <asm/gpio.h>
b8809e60 SG	15	#include <dm/device-internal.h>
	16
	17	DECLARE_GLOBAL_DATA_PTR;
ab693e9c	18
f6ae1ca0	19	#define S5P_GPIO_GET_PIN(x) (x % GPIO_PER_BANK)
8475c869	20
3a233dbf SG	21	#define CON_MASK(val) (0xf << ((val) << 2))
	22	#define CON_SFR(gpio, cfg) ((cfg) << ((gpio) << 2))
	23	#define CON_SFR_UNSHIFT(val, gpio) ((val) >> ((gpio) << 2))
ab693e9c	24
3a233dbf SG	25	#define DAT_MASK(gpio) (0x1 << (gpio))
3a233dbf SG	26	#define DAT_SET(gpio) (0x1 << (gpio))
ab693e9c	27
3a233dbf SG	28	#define PULL_MASK(gpio) (0x3 << ((gpio) << 1))
3a233dbf SG	29	#define PULL_MODE(gpio, pull) ((pull) << ((gpio) << 1))
ab693e9c	30
3a233dbf SG	31	#define DRV_MASK(gpio) (0x3 << ((gpio) << 1))
	32	#define DRV_SET(gpio, mode) ((mode) << ((gpio) << 1))
	33	#define RATE_MASK(gpio) (0x1 << (gpio + 16))
	34	#define RATE_SET(gpio) (0x1 << (gpio + 16))
ab693e9c	35
b8809e60 SG	36	/* Platform data for each bank */
	37	struct exynos_gpio_platdata {
	38	struct s5p_gpio_bank *bank;
	39	const char bank_name; / Name of port, e.g. 'gpa0" */
	40	};
	41
	42	/* Information about each bank at run-time */
	43	struct exynos_bank_info {
b8809e60 SG	44	struct s5p_gpio_bank *bank;
	45	};
	46
	47	static struct s5p_gpio_bank *s5p_gpio_get_bank(unsigned int gpio)
f6ae1ca0	48	{
b8809e60 SG	49	const struct gpio_info *data;
	50	unsigned int upto;
	51	int i, count;
f6ae1ca0	52
b8809e60 SG	53	data = get_gpio_data();
	54	count = get_bank_num();
	55	upto = 0;
	56
	57	for (i = 0; i < count; i++) {
	58	debug("i=%d, upto=%d\n", i, upto);
	59	if (gpio < data->max_gpio) {
	60	struct s5p_gpio_bank *bank;
	61	bank = (struct s5p_gpio_bank *)data->reg_addr;
	62	bank += (gpio - upto) / GPIO_PER_BANK;
	63	debug("gpio=%d, bank=%p\n", gpio, bank);
	64	return bank;
f6ae1ca0	65	}
f6ae1ca0	66
b8809e60 SG	67	upto = data->max_gpio;
	68	data++;
	69	}
	70
	71	return NULL;
f6ae1ca0 AS	72	}
	73
	74	static void s5p_gpio_cfg_pin(struct s5p_gpio_bank *bank, int gpio, int cfg)
ab693e9c MK	75	{
	76	unsigned int value;
	77
	78	value = readl(&bank->con);
	79	value &= ~CON_MASK(gpio);
	80	value \|= CON_SFR(gpio, cfg);
	81	writel(value, &bank->con);
	82	}
	83
f6ae1ca0	84	static void s5p_gpio_set_value(struct s5p_gpio_bank *bank, int gpio, int en)
ab693e9c MK	85	{
	86	unsigned int value;
	87
	88	value = readl(&bank->dat);
	89	value &= ~DAT_MASK(gpio);
	90	if (en)
	91	value \|= DAT_SET(gpio);
	92	writel(value, &bank->dat);
	93	}
	94
b8809e60 SG	95	#ifdef CONFIG_SPL_BUILD
	96	/* Common GPIO API - SPL does not support driver model yet */
	97	int gpio_set_value(unsigned gpio, int value)
f6ae1ca0	98	{
b8809e60 SG	99	s5p_gpio_set_value(s5p_gpio_get_bank(gpio),
b8809e60 SG	100	s5p_gpio_get_pin(gpio), value);
f6ae1ca0	101
b8809e60 SG	102	return 0;
	103	}
	104	#else
	105	static int s5p_gpio_get_cfg_pin(struct s5p_gpio_bank *bank, int gpio)
f6ae1ca0	106	{
b8809e60 SG	107	unsigned int value;
	108
	109	value = readl(&bank->con);
	110	value &= CON_MASK(gpio);
	111	return CON_SFR_UNSHIFT(value, gpio);
f6ae1ca0 AS	112	}
	113
	114	static unsigned int s5p_gpio_get_value(struct s5p_gpio_bank *bank, int gpio)
ab693e9c MK	115	{
	116	unsigned int value;
	117
	118	value = readl(&bank->dat);
	119	return !!(value & DAT_MASK(gpio));
	120	}
b8809e60	121	#endif /* CONFIG_SPL_BUILD */
ab693e9c	122
f6ae1ca0	123	static void s5p_gpio_set_pull(struct s5p_gpio_bank *bank, int gpio, int mode)
ab693e9c MK	124	{
	125	unsigned int value;
	126
	127	value = readl(&bank->pull);
	128	value &= ~PULL_MASK(gpio);
	129
	130	switch (mode) {
f6ae1ca0 AS	131	case S5P_GPIO_PULL_DOWN:
f6ae1ca0 AS	132	case S5P_GPIO_PULL_UP:
ab693e9c MK	133	value \|= PULL_MODE(gpio, mode);
	134	break;
	135	default:
ffb4b025	136	break;
ab693e9c MK	137	}
	138
	139	writel(value, &bank->pull);
	140	}
	141
f6ae1ca0	142	static void s5p_gpio_set_drv(struct s5p_gpio_bank *bank, int gpio, int mode)
ab693e9c MK	143	{
	144	unsigned int value;
	145
	146	value = readl(&bank->drv);
	147	value &= ~DRV_MASK(gpio);
	148
	149	switch (mode) {
f6ae1ca0 AS	150	case S5P_GPIO_DRV_1X:
	151	case S5P_GPIO_DRV_2X:
	152	case S5P_GPIO_DRV_3X:
	153	case S5P_GPIO_DRV_4X:
ab693e9c MK	154	value \|= DRV_SET(gpio, mode);
	155	break;
	156	default:
	157	return;
	158	}
	159
	160	writel(value, &bank->drv);
	161	}
	162
f6ae1ca0	163	static void s5p_gpio_set_rate(struct s5p_gpio_bank *bank, int gpio, int mode)
ab693e9c MK	164	{
	165	unsigned int value;
	166
	167	value = readl(&bank->drv);
	168	value &= ~RATE_MASK(gpio);
	169
	170	switch (mode) {
f6ae1ca0 AS	171	case S5P_GPIO_DRV_FAST:
f6ae1ca0 AS	172	case S5P_GPIO_DRV_SLOW:
ab693e9c MK	173	value \|= RATE_SET(gpio);
	174	break;
	175	default:
	176	return;
	177	}
	178
	179	writel(value, &bank->drv);
	180	}
9f15bc0c	181
b8809e60	182	int s5p_gpio_get_pin(unsigned gpio)
9f15bc0c	183	{
b8809e60 SG	184	return S5P_GPIO_GET_PIN(gpio);
b8809e60 SG	185	}
f6ae1ca0	186
b8809e60 SG	187	/* Driver model interface */
b8809e60 SG	188	#ifndef CONFIG_SPL_BUILD
b8809e60 SG	189	/* set GPIO pin 'gpio' as an input */
b8809e60 SG	190	static int exynos_gpio_direction_input(struct udevice *dev, unsigned offset)
9f15bc0c	191	{
b8809e60	192	struct exynos_bank_info *state = dev_get_priv(dev);
b8809e60 SG	193
	194	/* Configure GPIO direction as input. */
	195	s5p_gpio_cfg_pin(state->bank, offset, S5P_GPIO_INPUT);
365d6070	196
9f15bc0c ŁM	197	return 0;
	198	}
	199
b8809e60 SG	200	/* set GPIO pin 'gpio' as an output, with polarity 'value' */
	201	static int exynos_gpio_direction_output(struct udevice *dev, unsigned offset,
	202	int value)
9f15bc0c	203	{
b8809e60	204	struct exynos_bank_info *state = dev_get_priv(dev);
b8809e60 SG	205
	206	/* Configure GPIO output value. */
	207	s5p_gpio_set_value(state->bank, offset, value);
	208
	209	/* Configure GPIO direction as output. */
	210	s5p_gpio_cfg_pin(state->bank, offset, S5P_GPIO_OUTPUT);
	211
9f15bc0c ŁM	212	return 0;
	213	}
	214
b8809e60 SG	215	/* read GPIO IN value of pin 'gpio' */
b8809e60 SG	216	static int exynos_gpio_get_value(struct udevice *dev, unsigned offset)
9f15bc0c	217	{
b8809e60	218	struct exynos_bank_info *state = dev_get_priv(dev);
b8809e60 SG	219
b8809e60 SG	220	return s5p_gpio_get_value(state->bank, offset);
9f15bc0c ŁM	221	}
9f15bc0c ŁM	222
b8809e60 SG	223	/* write GPIO OUT value to pin 'gpio' */
	224	static int exynos_gpio_set_value(struct udevice *dev, unsigned offset,
	225	int value)
9f15bc0c	226	{
b8809e60	227	struct exynos_bank_info *state = dev_get_priv(dev);
b8809e60 SG	228
	229	s5p_gpio_set_value(state->bank, offset, value);
	230
365d6070	231	return 0;
9f15bc0c	232	}
b8809e60	233	#endif /* nCONFIG_SPL_BUILD */
f6ae1ca0	234
b8809e60 SG	235	/*
	236	* There is no common GPIO API for pull, drv, pin, rate (yet). These
	237	* functions are kept here to preserve function ordering for review.
	238	*/
f6ae1ca0 AS	239	void gpio_set_pull(int gpio, int mode)
	240	{
	241	s5p_gpio_set_pull(s5p_gpio_get_bank(gpio),
	242	s5p_gpio_get_pin(gpio), mode);
	243	}
	244
	245	void gpio_set_drv(int gpio, int mode)
	246	{
	247	s5p_gpio_set_drv(s5p_gpio_get_bank(gpio),
	248	s5p_gpio_get_pin(gpio), mode);
	249	}
	250
	251	void gpio_cfg_pin(int gpio, int cfg)
	252	{
	253	s5p_gpio_cfg_pin(s5p_gpio_get_bank(gpio),
	254	s5p_gpio_get_pin(gpio), cfg);
	255	}
	256
	257	void gpio_set_rate(int gpio, int mode)
	258	{
	259	s5p_gpio_set_rate(s5p_gpio_get_bank(gpio),
	260	s5p_gpio_get_pin(gpio), mode);
	261	}
b8809e60 SG	262
	263	#ifndef CONFIG_SPL_BUILD
	264	static int exynos_gpio_get_function(struct udevice *dev, unsigned offset)
	265	{
	266	struct exynos_bank_info *state = dev_get_priv(dev);
	267	int cfg;
	268
b8809e60 SG	269	cfg = s5p_gpio_get_cfg_pin(state->bank, offset);
	270	if (cfg == S5P_GPIO_OUTPUT)
	271	return GPIOF_OUTPUT;
	272	else if (cfg == S5P_GPIO_INPUT)
	273	return GPIOF_INPUT;
	274	else
	275	return GPIOF_FUNC;
	276	}
	277
	278	static const struct dm_gpio_ops gpio_exynos_ops = {
b8809e60 SG	279	.direction_input = exynos_gpio_direction_input,
	280	.direction_output = exynos_gpio_direction_output,
	281	.get_value = exynos_gpio_get_value,
	282	.set_value = exynos_gpio_set_value,
	283	.get_function = exynos_gpio_get_function,
b8809e60 SG	284	};
	285
	286	static int gpio_exynos_probe(struct udevice *dev)
	287	{
e564f054	288	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
b8809e60 SG	289	struct exynos_bank_info *priv = dev->priv;
	290	struct exynos_gpio_platdata *plat = dev->platdata;
	291
	292	/* Only child devices have ports */
	293	if (!plat)
	294	return 0;
	295
	296	priv->bank = plat->bank;
	297
	298	uc_priv->gpio_count = GPIO_PER_BANK;
	299	uc_priv->bank_name = plat->bank_name;
	300
	301	return 0;
	302	}
	303
	304	/**
	305	* We have a top-level GPIO device with no actual GPIOs. It has a child
	306	* device for each Exynos GPIO bank.
	307	*/
	308	static int gpio_exynos_bind(struct udevice *parent)
	309	{
	310	struct exynos_gpio_platdata *plat = parent->platdata;
	311	struct s5p_gpio_bank bank, base;
	312	const void *blob = gd->fdt_blob;
	313	int node;
	314
	315	/* If this is a child device, there is nothing to do here */
	316	if (plat)
	317	return 0;
	318
a821c4af	319	base = (struct s5p_gpio_bank *)devfdt_get_addr(parent);
e160f7d4	320	for (node = fdt_first_subnode(blob, dev_of_offset(parent)), bank = base;
b8809e60 SG	321	node > 0;
	322	node = fdt_next_subnode(blob, node), bank++) {
	323	struct exynos_gpio_platdata *plat;
	324	struct udevice *dev;
	325	fdt_addr_t reg;
	326	int ret;
	327
	328	if (!fdtdec_get_bool(blob, node, "gpio-controller"))
	329	continue;
	330	plat = calloc(1, sizeof(*plat));
	331	if (!plat)
	332	return -ENOMEM;
b8809e60	333
6f183e86	334	plat->bank_name = fdt_get_name(blob, node, NULL);
b8809e60	335	ret = device_bind(parent, parent->driver,
6f183e86	336	plat->bank_name, plat, -1, &dev);
b8809e60 SG	337	if (ret)
b8809e60 SG	338	return ret;
6f183e86	339
e160f7d4	340	dev_set_of_offset(dev, node);
6f183e86	341
a821c4af	342	reg = devfdt_get_addr(dev);
6f183e86 PM	343	if (reg != FDT_ADDR_T_NONE)
	344	bank = (struct s5p_gpio_bank *)((ulong)base + reg);
	345
	346	plat->bank = bank;
	347
	348	debug("dev at %p: %s\n", bank, plat->bank_name);
b8809e60 SG	349	}
	350
	351	return 0;
	352	}
	353
	354	static const struct udevice_id exynos_gpio_ids[] = {
	355	{ .compatible = "samsung,s5pc100-pinctrl" },
	356	{ .compatible = "samsung,s5pc110-pinctrl" },
	357	{ .compatible = "samsung,exynos4210-pinctrl" },
	358	{ .compatible = "samsung,exynos4x12-pinctrl" },
	359	{ .compatible = "samsung,exynos5250-pinctrl" },
	360	{ .compatible = "samsung,exynos5420-pinctrl" },
	361	{ }
	362	};
	363
	364	U_BOOT_DRIVER(gpio_exynos) = {
	365	.name = "gpio_exynos",
	366	.id = UCLASS_GPIO,
	367	.of_match = exynos_gpio_ids,
	368	.bind = gpio_exynos_bind,
	369	.probe = gpio_exynos_probe,
	370	.priv_auto_alloc_size = sizeof(struct exynos_bank_info),
	371	.ops = &gpio_exynos_ops,
	372	};
	373	#endif