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1// SPDX-License-Identifier: GPL-2.0-only2// Copyright (C) 2014-2017 Broadcom3 4/*5 * This file contains the Broadcom Northstar Plus (NSP) GPIO driver that6 * supports the chipCommonA GPIO controller. Basic PINCONF such as bias,7 * pull up/down, slew and drive strength are also supported in this driver.8 *9 * Pins from the chipCommonA  GPIO can be individually muxed to GPIO function,10 * through the interaction with the NSP IOMUX controller.11 */12 13#include <linux/gpio/driver.h>14#include <linux/interrupt.h>15#include <linux/io.h>16#include <linux/ioport.h>17#include <linux/kernel.h>18#include <linux/of.h>19#include <linux/pinctrl/pinconf.h>20#include <linux/pinctrl/pinconf-generic.h>21#include <linux/pinctrl/pinctrl.h>22#include <linux/platform_device.h>23#include <linux/slab.h>24 25#include "../pinctrl-utils.h"26 27#define NSP_CHIP_A_INT_STATUS		0x0028#define NSP_CHIP_A_INT_MASK		0x0429#define NSP_GPIO_DATA_IN		0x4030#define NSP_GPIO_DATA_OUT		0x4431#define NSP_GPIO_OUT_EN			0x4832#define NSP_GPIO_INT_POLARITY		0x5033#define NSP_GPIO_INT_MASK		0x5434#define NSP_GPIO_EVENT			0x5835#define NSP_GPIO_EVENT_INT_MASK		0x5c36#define NSP_GPIO_EVENT_INT_POLARITY	0x6437#define NSP_CHIP_A_GPIO_INT_BIT		0x0138 39/* I/O parameters offset for chipcommon A GPIO */40#define NSP_GPIO_DRV_CTRL		0x0041#define NSP_GPIO_HYSTERESIS_EN		0x1042#define NSP_GPIO_SLEW_RATE_EN		0x1443#define NSP_PULL_UP_EN			0x1844#define NSP_PULL_DOWN_EN		0x1c45#define GPIO_DRV_STRENGTH_BITS		0x0346 47/*48 * nsp GPIO core49 *50 * @dev: pointer to device51 * @base: I/O register base for nsp GPIO controller52 * @io_ctrl: I/O register base for PINCONF support outside the GPIO block53 * @gc: GPIO chip54 * @pctl: pointer to pinctrl_dev55 * @pctldesc: pinctrl descriptor56 * @lock: lock to protect access to I/O registers57 */58struct nsp_gpio {59	struct device *dev;60	void __iomem *base;61	void __iomem *io_ctrl;62	struct gpio_chip gc;63	struct pinctrl_dev *pctl;64	struct pinctrl_desc pctldesc;65	raw_spinlock_t lock;66};67 68enum base_type {69	REG,70	IO_CTRL71};72 73/*74 * Mapping from PINCONF pins to GPIO pins is 1-to-175 */76static inline unsigned nsp_pin_to_gpio(unsigned pin)77{78	return pin;79}80 81/*82 *  nsp_set_bit - set or clear one bit (corresponding to the GPIO pin) in a83 *  nsp GPIO register84 *85 *  @nsp_gpio: nsp GPIO device86 *  @base_type: reg base to modify87 *  @reg: register offset88 *  @gpio: GPIO pin89 *  @set: set or clear90 */91static inline void nsp_set_bit(struct nsp_gpio *chip, enum base_type address,92			       unsigned int reg, unsigned gpio, bool set)93{94	u32 val;95	void __iomem *base_address;96 97	if (address == IO_CTRL)98		base_address = chip->io_ctrl;99	else100		base_address = chip->base;101 102	val = readl(base_address + reg);103	if (set)104		val |= BIT(gpio);105	else106		val &= ~BIT(gpio);107 108	writel(val, base_address + reg);109}110 111/*112 *  nsp_get_bit - get one bit (corresponding to the GPIO pin) in a113 *  nsp GPIO register114 */115static inline bool nsp_get_bit(struct nsp_gpio *chip, enum base_type address,116			       unsigned int reg, unsigned gpio)117{118	if (address == IO_CTRL)119		return !!(readl(chip->io_ctrl + reg) & BIT(gpio));120	else121		return !!(readl(chip->base + reg) & BIT(gpio));122}123 124static irqreturn_t nsp_gpio_irq_handler(int irq, void *data)125{126	struct gpio_chip *gc = (struct gpio_chip *)data;127	struct nsp_gpio *chip = gpiochip_get_data(gc);128	int bit;129	unsigned long int_bits = 0;130	u32 int_status;131 132	/* go through the entire GPIOs and handle all interrupts */133	int_status = readl(chip->base + NSP_CHIP_A_INT_STATUS);134	if (int_status & NSP_CHIP_A_GPIO_INT_BIT) {135		unsigned int event, level;136 137		/* Get level and edge interrupts */138		event = readl(chip->base + NSP_GPIO_EVENT_INT_MASK) &139			      readl(chip->base + NSP_GPIO_EVENT);140		level = readl(chip->base + NSP_GPIO_DATA_IN) ^141			      readl(chip->base + NSP_GPIO_INT_POLARITY);142		level &= readl(chip->base + NSP_GPIO_INT_MASK);143		int_bits = level | event;144 145		for_each_set_bit(bit, &int_bits, gc->ngpio)146			generic_handle_domain_irq(gc->irq.domain, bit);147	}148 149	return  int_bits ? IRQ_HANDLED : IRQ_NONE;150}151 152static void nsp_gpio_irq_ack(struct irq_data *d)153{154	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);155	struct nsp_gpio *chip = gpiochip_get_data(gc);156	unsigned gpio = d->hwirq;157	u32 val = BIT(gpio);158	u32 trigger_type;159 160	trigger_type = irq_get_trigger_type(d->irq);161	if (trigger_type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))162		writel(val, chip->base + NSP_GPIO_EVENT);163}164 165/*166 *  nsp_gpio_irq_set_mask - mask/unmask a GPIO interrupt167 *168 *  @d: IRQ chip data169 *  @unmask: mask/unmask GPIO interrupt170 */171static void nsp_gpio_irq_set_mask(struct irq_data *d, bool unmask)172{173	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);174	struct nsp_gpio *chip = gpiochip_get_data(gc);175	unsigned gpio = d->hwirq;176	u32 trigger_type;177 178	trigger_type = irq_get_trigger_type(d->irq);179	if (trigger_type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))180		nsp_set_bit(chip, REG, NSP_GPIO_EVENT_INT_MASK, gpio, unmask);181	else182		nsp_set_bit(chip, REG, NSP_GPIO_INT_MASK, gpio, unmask);183}184 185static void nsp_gpio_irq_mask(struct irq_data *d)186{187	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);188	struct nsp_gpio *chip = gpiochip_get_data(gc);189	unsigned long flags;190 191	raw_spin_lock_irqsave(&chip->lock, flags);192	nsp_gpio_irq_set_mask(d, false);193	raw_spin_unlock_irqrestore(&chip->lock, flags);194	gpiochip_disable_irq(gc, irqd_to_hwirq(d));195}196 197static void nsp_gpio_irq_unmask(struct irq_data *d)198{199	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);200	struct nsp_gpio *chip = gpiochip_get_data(gc);201	unsigned long flags;202 203	gpiochip_enable_irq(gc, irqd_to_hwirq(d));204	raw_spin_lock_irqsave(&chip->lock, flags);205	nsp_gpio_irq_set_mask(d, true);206	raw_spin_unlock_irqrestore(&chip->lock, flags);207}208 209static int nsp_gpio_irq_set_type(struct irq_data *d, unsigned int type)210{211	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);212	struct nsp_gpio *chip = gpiochip_get_data(gc);213	unsigned gpio = d->hwirq;214	bool level_low;215	bool falling;216	unsigned long flags;217 218	raw_spin_lock_irqsave(&chip->lock, flags);219	falling = nsp_get_bit(chip, REG, NSP_GPIO_EVENT_INT_POLARITY, gpio);220	level_low = nsp_get_bit(chip, REG, NSP_GPIO_INT_POLARITY, gpio);221 222	switch (type & IRQ_TYPE_SENSE_MASK) {223	case IRQ_TYPE_EDGE_RISING:224		falling = false;225		break;226 227	case IRQ_TYPE_EDGE_FALLING:228		falling = true;229		break;230 231	case IRQ_TYPE_LEVEL_HIGH:232		level_low = false;233		break;234 235	case IRQ_TYPE_LEVEL_LOW:236		level_low = true;237		break;238 239	default:240		dev_err(chip->dev, "invalid GPIO IRQ type 0x%x\n",241			type);242		raw_spin_unlock_irqrestore(&chip->lock, flags);243		return -EINVAL;244	}245 246	nsp_set_bit(chip, REG, NSP_GPIO_EVENT_INT_POLARITY, gpio, falling);247	nsp_set_bit(chip, REG, NSP_GPIO_INT_POLARITY, gpio, level_low);248 249	if (type & IRQ_TYPE_EDGE_BOTH)250		irq_set_handler_locked(d, handle_edge_irq);251	else252		irq_set_handler_locked(d, handle_level_irq);253 254	raw_spin_unlock_irqrestore(&chip->lock, flags);255 256	dev_dbg(chip->dev, "gpio:%u level_low:%s falling:%s\n", gpio,257		level_low ? "true" : "false", falling ? "true" : "false");258	return 0;259}260 261static const struct irq_chip nsp_gpio_irq_chip = {262	.name = "gpio-a",263	.irq_ack = nsp_gpio_irq_ack,264	.irq_mask = nsp_gpio_irq_mask,265	.irq_unmask = nsp_gpio_irq_unmask,266	.irq_set_type = nsp_gpio_irq_set_type,267	.flags = IRQCHIP_IMMUTABLE,268	GPIOCHIP_IRQ_RESOURCE_HELPERS,269};270 271static int nsp_gpio_direction_input(struct gpio_chip *gc, unsigned gpio)272{273	struct nsp_gpio *chip = gpiochip_get_data(gc);274	unsigned long flags;275 276	raw_spin_lock_irqsave(&chip->lock, flags);277	nsp_set_bit(chip, REG, NSP_GPIO_OUT_EN, gpio, false);278	raw_spin_unlock_irqrestore(&chip->lock, flags);279 280	dev_dbg(chip->dev, "gpio:%u set input\n", gpio);281	return 0;282}283 284static int nsp_gpio_direction_output(struct gpio_chip *gc, unsigned gpio,285				     int val)286{287	struct nsp_gpio *chip = gpiochip_get_data(gc);288	unsigned long flags;289 290	raw_spin_lock_irqsave(&chip->lock, flags);291	nsp_set_bit(chip, REG, NSP_GPIO_OUT_EN, gpio, true);292	nsp_set_bit(chip, REG, NSP_GPIO_DATA_OUT, gpio, !!(val));293	raw_spin_unlock_irqrestore(&chip->lock, flags);294 295	dev_dbg(chip->dev, "gpio:%u set output, value:%d\n", gpio, val);296	return 0;297}298 299static int nsp_gpio_get_direction(struct gpio_chip *gc, unsigned gpio)300{301	struct nsp_gpio *chip = gpiochip_get_data(gc);302	unsigned long flags;303	int val;304 305	raw_spin_lock_irqsave(&chip->lock, flags);306	val = nsp_get_bit(chip, REG, NSP_GPIO_OUT_EN, gpio);307	raw_spin_unlock_irqrestore(&chip->lock, flags);308 309	return !val;310}311 312static void nsp_gpio_set(struct gpio_chip *gc, unsigned gpio, int val)313{314	struct nsp_gpio *chip = gpiochip_get_data(gc);315	unsigned long flags;316 317	raw_spin_lock_irqsave(&chip->lock, flags);318	nsp_set_bit(chip, REG, NSP_GPIO_DATA_OUT, gpio, !!(val));319	raw_spin_unlock_irqrestore(&chip->lock, flags);320 321	dev_dbg(chip->dev, "gpio:%u set, value:%d\n", gpio, val);322}323 324static int nsp_gpio_get(struct gpio_chip *gc, unsigned gpio)325{326	struct nsp_gpio *chip = gpiochip_get_data(gc);327 328	return !!(readl(chip->base + NSP_GPIO_DATA_IN) & BIT(gpio));329}330 331static int nsp_get_groups_count(struct pinctrl_dev *pctldev)332{333	return 1;334}335 336/*337 * Only one group: "gpio_grp", since this local pinctrl device only performs338 * GPIO specific PINCONF configurations339 */340static const char *nsp_get_group_name(struct pinctrl_dev *pctldev,341				      unsigned selector)342{343	return "gpio_grp";344}345 346static const struct pinctrl_ops nsp_pctrl_ops = {347	.get_groups_count = nsp_get_groups_count,348	.get_group_name = nsp_get_group_name,349	.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,350	.dt_free_map = pinctrl_utils_free_map,351};352 353static int nsp_gpio_set_slew(struct nsp_gpio *chip, unsigned gpio, u32 slew)354{355	if (slew)356		nsp_set_bit(chip, IO_CTRL, NSP_GPIO_SLEW_RATE_EN, gpio, true);357	else358		nsp_set_bit(chip, IO_CTRL, NSP_GPIO_SLEW_RATE_EN, gpio, false);359 360	return 0;361}362 363static int nsp_gpio_set_pull(struct nsp_gpio *chip, unsigned gpio,364			     bool pull_up, bool pull_down)365{366	unsigned long flags;367 368	raw_spin_lock_irqsave(&chip->lock, flags);369	nsp_set_bit(chip, IO_CTRL, NSP_PULL_DOWN_EN, gpio, pull_down);370	nsp_set_bit(chip, IO_CTRL, NSP_PULL_UP_EN, gpio, pull_up);371	raw_spin_unlock_irqrestore(&chip->lock, flags);372 373	dev_dbg(chip->dev, "gpio:%u set pullup:%d pulldown: %d\n",374		gpio, pull_up, pull_down);375	return 0;376}377 378static void nsp_gpio_get_pull(struct nsp_gpio *chip, unsigned gpio,379			      bool *pull_up, bool *pull_down)380{381	unsigned long flags;382 383	raw_spin_lock_irqsave(&chip->lock, flags);384	*pull_up = nsp_get_bit(chip, IO_CTRL, NSP_PULL_UP_EN, gpio);385	*pull_down = nsp_get_bit(chip, IO_CTRL, NSP_PULL_DOWN_EN, gpio);386	raw_spin_unlock_irqrestore(&chip->lock, flags);387}388 389static int nsp_gpio_set_strength(struct nsp_gpio *chip, unsigned gpio,390				 u32 strength)391{392	u32 offset, shift, i;393	u32 val;394	unsigned long flags;395 396	/* make sure drive strength is supported */397	if (strength < 2 || strength > 16 || (strength % 2))398		return -ENOTSUPP;399 400	shift = gpio;401	offset = NSP_GPIO_DRV_CTRL;402	dev_dbg(chip->dev, "gpio:%u set drive strength:%d mA\n", gpio,403		strength);404	raw_spin_lock_irqsave(&chip->lock, flags);405	strength = (strength / 2) - 1;406	for (i = GPIO_DRV_STRENGTH_BITS; i > 0; i--) {407		val = readl(chip->io_ctrl + offset);408		val &= ~BIT(shift);409		val |= ((strength >> (i-1)) & 0x1) << shift;410		writel(val, chip->io_ctrl + offset);411		offset += 4;412	}413	raw_spin_unlock_irqrestore(&chip->lock, flags);414 415	return 0;416}417 418static int nsp_gpio_get_strength(struct nsp_gpio *chip, unsigned gpio,419				 u16 *strength)420{421	unsigned int offset, shift;422	u32 val;423	unsigned long flags;424	int i;425 426	offset = NSP_GPIO_DRV_CTRL;427	shift = gpio;428 429	raw_spin_lock_irqsave(&chip->lock, flags);430	*strength = 0;431	for (i = (GPIO_DRV_STRENGTH_BITS - 1); i >= 0; i--) {432		val = readl(chip->io_ctrl + offset) & BIT(shift);433		val >>= shift;434		*strength += (val << i);435		offset += 4;436	}437 438	/* convert to mA */439	*strength = (*strength + 1) * 2;440	raw_spin_unlock_irqrestore(&chip->lock, flags);441 442	return 0;443}444 445static int nsp_pin_config_group_get(struct pinctrl_dev *pctldev,446				    unsigned selector,447			     unsigned long *config)448{449	return 0;450}451 452static int nsp_pin_config_group_set(struct pinctrl_dev *pctldev,453				    unsigned selector,454			     unsigned long *configs, unsigned num_configs)455{456	return 0;457}458 459static int nsp_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin,460			      unsigned long *config)461{462	struct nsp_gpio *chip = pinctrl_dev_get_drvdata(pctldev);463	enum pin_config_param param = pinconf_to_config_param(*config);464	unsigned int gpio;465	u16 arg = 0;466	bool pull_up, pull_down;467	int ret;468 469	gpio = nsp_pin_to_gpio(pin);470	switch (param) {471	case PIN_CONFIG_BIAS_DISABLE:472		nsp_gpio_get_pull(chip, gpio, &pull_up, &pull_down);473		if ((pull_up == false) && (pull_down == false))474			return 0;475		else476			return -EINVAL;477 478	case PIN_CONFIG_BIAS_PULL_UP:479		nsp_gpio_get_pull(chip, gpio, &pull_up, &pull_down);480		if (pull_up)481			return 0;482		else483			return -EINVAL;484 485	case PIN_CONFIG_BIAS_PULL_DOWN:486		nsp_gpio_get_pull(chip, gpio, &pull_up, &pull_down);487		if (pull_down)488			return 0;489		else490			return -EINVAL;491 492	case PIN_CONFIG_DRIVE_STRENGTH:493		ret = nsp_gpio_get_strength(chip, gpio, &arg);494		if (ret)495			return ret;496		*config = pinconf_to_config_packed(param, arg);497		return 0;498 499	default:500		return -ENOTSUPP;501	}502}503 504static int nsp_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin,505			      unsigned long *configs, unsigned num_configs)506{507	struct nsp_gpio *chip = pinctrl_dev_get_drvdata(pctldev);508	enum pin_config_param param;509	u32 arg;510	unsigned int i, gpio;511	int ret = -ENOTSUPP;512 513	gpio = nsp_pin_to_gpio(pin);514	for (i = 0; i < num_configs; i++) {515		param = pinconf_to_config_param(configs[i]);516		arg = pinconf_to_config_argument(configs[i]);517 518		switch (param) {519		case PIN_CONFIG_BIAS_DISABLE:520			ret = nsp_gpio_set_pull(chip, gpio, false, false);521			if (ret < 0)522				goto out;523			break;524 525		case PIN_CONFIG_BIAS_PULL_UP:526			ret = nsp_gpio_set_pull(chip, gpio, true, false);527			if (ret < 0)528				goto out;529			break;530 531		case PIN_CONFIG_BIAS_PULL_DOWN:532			ret = nsp_gpio_set_pull(chip, gpio, false, true);533			if (ret < 0)534				goto out;535			break;536 537		case PIN_CONFIG_DRIVE_STRENGTH:538			ret = nsp_gpio_set_strength(chip, gpio, arg);539			if (ret < 0)540				goto out;541			break;542 543		case PIN_CONFIG_SLEW_RATE:544			ret = nsp_gpio_set_slew(chip, gpio, arg);545			if (ret < 0)546				goto out;547			break;548 549		default:550			dev_err(chip->dev, "invalid configuration\n");551			return -ENOTSUPP;552		}553	}554 555out:556	return ret;557}558 559static const struct pinconf_ops nsp_pconf_ops = {560	.is_generic = true,561	.pin_config_get = nsp_pin_config_get,562	.pin_config_set = nsp_pin_config_set,563	.pin_config_group_get = nsp_pin_config_group_get,564	.pin_config_group_set = nsp_pin_config_group_set,565};566 567/*568 * NSP GPIO controller supports some PINCONF related configurations such as569 * pull up, pull down, slew and drive strength, when the pin is configured570 * to GPIO.571 *572 * Here a local pinctrl device is created with simple 1-to-1 pin mapping to the573 * local GPIO pins574 */575static int nsp_gpio_register_pinconf(struct nsp_gpio *chip)576{577	struct pinctrl_desc *pctldesc = &chip->pctldesc;578	struct pinctrl_pin_desc *pins;579	struct gpio_chip *gc = &chip->gc;580	int i;581 582	pins = devm_kcalloc(chip->dev, gc->ngpio, sizeof(*pins), GFP_KERNEL);583	if (!pins)584		return -ENOMEM;585	for (i = 0; i < gc->ngpio; i++) {586		pins[i].number = i;587		pins[i].name = devm_kasprintf(chip->dev, GFP_KERNEL,588					      "gpio-%d", i);589		if (!pins[i].name)590			return -ENOMEM;591	}592	pctldesc->name = dev_name(chip->dev);593	pctldesc->pctlops = &nsp_pctrl_ops;594	pctldesc->pins = pins;595	pctldesc->npins = gc->ngpio;596	pctldesc->confops = &nsp_pconf_ops;597 598	chip->pctl = devm_pinctrl_register(chip->dev, pctldesc, chip);599	if (IS_ERR(chip->pctl)) {600		dev_err(chip->dev, "unable to register pinctrl device\n");601		return PTR_ERR(chip->pctl);602	}603 604	return 0;605}606 607static const struct of_device_id nsp_gpio_of_match[] = {608	{.compatible = "brcm,nsp-gpio-a",},609	{}610};611 612static int nsp_gpio_probe(struct platform_device *pdev)613{614	struct device *dev = &pdev->dev;615	struct nsp_gpio *chip;616	struct gpio_chip *gc;617	u32 val;618	int irq, ret;619 620	if (of_property_read_u32(pdev->dev.of_node, "ngpios", &val)) {621		dev_err(&pdev->dev, "Missing ngpios OF property\n");622		return -ENODEV;623	}624 625	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);626	if (!chip)627		return -ENOMEM;628 629	chip->dev = dev;630	platform_set_drvdata(pdev, chip);631 632	chip->base = devm_platform_ioremap_resource(pdev, 0);633	if (IS_ERR(chip->base)) {634		dev_err(dev, "unable to map I/O memory\n");635		return PTR_ERR(chip->base);636	}637 638	chip->io_ctrl = devm_platform_ioremap_resource(pdev, 1);639	if (IS_ERR(chip->io_ctrl)) {640		dev_err(dev, "unable to map I/O memory\n");641		return PTR_ERR(chip->io_ctrl);642	}643 644	raw_spin_lock_init(&chip->lock);645	gc = &chip->gc;646	gc->base = -1;647	gc->can_sleep = false;648	gc->ngpio = val;649	gc->label = dev_name(dev);650	gc->parent = dev;651	gc->request = gpiochip_generic_request;652	gc->free = gpiochip_generic_free;653	gc->direction_input = nsp_gpio_direction_input;654	gc->direction_output = nsp_gpio_direction_output;655	gc->get_direction = nsp_gpio_get_direction;656	gc->set = nsp_gpio_set;657	gc->get = nsp_gpio_get;658 659	/* optional GPIO interrupt support */660	irq = platform_get_irq(pdev, 0);661	if (irq > 0) {662		struct gpio_irq_chip *girq;663 664		val = readl(chip->base + NSP_CHIP_A_INT_MASK);665		val = val | NSP_CHIP_A_GPIO_INT_BIT;666		writel(val, (chip->base + NSP_CHIP_A_INT_MASK));667 668		/* Install ISR for this GPIO controller. */669		ret = devm_request_irq(dev, irq, nsp_gpio_irq_handler,670				       IRQF_SHARED, "gpio-a", &chip->gc);671		if (ret) {672			dev_err(&pdev->dev, "Unable to request IRQ%d: %d\n",673				irq, ret);674			return ret;675		}676 677		girq = &chip->gc.irq;678		gpio_irq_chip_set_chip(girq, &nsp_gpio_irq_chip);679		/* This will let us handle the parent IRQ in the driver */680		girq->parent_handler = NULL;681		girq->num_parents = 0;682		girq->parents = NULL;683		girq->default_type = IRQ_TYPE_NONE;684		girq->handler = handle_bad_irq;685	}686 687	ret = devm_gpiochip_add_data(dev, gc, chip);688	if (ret < 0)689		return dev_err_probe(dev, ret, "unable to add GPIO chip\n");690 691	ret = nsp_gpio_register_pinconf(chip);692	if (ret) {693		dev_err(dev, "unable to register pinconf\n");694		return ret;695	}696 697	return 0;698}699 700static struct platform_driver nsp_gpio_driver = {701	.driver = {702		.name = "nsp-gpio-a",703		.of_match_table = nsp_gpio_of_match,704	},705	.probe = nsp_gpio_probe,706};707 708static int __init nsp_gpio_init(void)709{710	return platform_driver_register(&nsp_gpio_driver);711}712arch_initcall_sync(nsp_gpio_init);713