// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2013 MundoReader S.L.
* Author: Heiko Stuebner <heiko@sntech.de>
*
* Copyright (c) 2021 Rockchip Electronics Co. Ltd.
*/
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/gpio/driver.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include "../pinctrl/core.h"
#include "../pinctrl/pinctrl-rockchip.h"
#define GPIO_TYPE_V1 (0) /* GPIO Version ID reserved */
#define GPIO_TYPE_V2 (0x01000C2B) /* GPIO Version ID 0x01000C2B */
#define GPIO_TYPE_V2_1 (0x0101157C) /* GPIO Version ID 0x0101157C */
static const struct rockchip_gpio_regs gpio_regs_v1 = {
.port_dr = 0x00,
.port_ddr = 0x04,
.int_en = 0x30,
.int_mask = 0x34,
.int_type = 0x38,
.int_polarity = 0x3c,
.int_status = 0x40,
.int_rawstatus = 0x44,
.debounce = 0x48,
.port_eoi = 0x4c,
.ext_port = 0x50,
};
static const struct rockchip_gpio_regs gpio_regs_v2 = {
.port_dr = 0x00,
.port_ddr = 0x08,
.int_en = 0x10,
.int_mask = 0x18,
.int_type = 0x20,
.int_polarity = 0x28,
.int_bothedge = 0x30,
.int_status = 0x50,
.int_rawstatus = 0x58,
.debounce = 0x38,
.dbclk_div_en = 0x40,
.dbclk_div_con = 0x48,
.port_eoi = 0x60,
.ext_port = 0x70,
.version_id = 0x78,
};
static inline void gpio_writel_v2(u32 val, void __iomem *reg)
{
writel((val & 0xffff) | 0xffff0000, reg);
writel((val >> 16) | 0xffff0000, reg + 0x4);
}
static inline u32 gpio_readl_v2(void __iomem *reg)
{
return readl(reg + 0x4) << 16 | readl(reg);
}
static inline void rockchip_gpio_writel(struct rockchip_pin_bank *bank,
u32 value, unsigned int offset)
{
void __iomem *reg = bank->reg_base + offset;
if (bank->gpio_type == GPIO_TYPE_V2)
gpio_writel_v2(value, reg);
else
writel(value, reg);
}
static inline u32 rockchip_gpio_readl(struct rockchip_pin_bank *bank,
unsigned int offset)
{
void __iomem *reg = bank->reg_base + offset;
u32 value;
if (bank->gpio_type == GPIO_TYPE_V2)
value = gpio_readl_v2(reg);
else
value = readl(reg);
return value;
}
static inline void rockchip_gpio_writel_bit(struct rockchip_pin_bank *bank,
u32 bit, u32 value,
unsigned int offset)
{
void __iomem *reg = bank->reg_base + offset;
u32 data;
if (bank->gpio_type == GPIO_TYPE_V2) {
if (value)
data = BIT(bit % 16) | BIT(bit % 16 + 16);
else
data = BIT(bit % 16 + 16);
writel(data, bit >= 16 ? reg + 0x4 : reg);
} else {
data = readl(reg);
data &= ~BIT(bit);
if (value)
data |= BIT(bit);
writel(data, reg);
}
}
static inline u32 rockchip_gpio_readl_bit(struct rockchip_pin_bank *bank,
u32 bit, unsigned int offset)
{
void __iomem *reg = bank->reg_base + offset;
u32 data;
if (bank->gpio_type == GPIO_TYPE_V2) {
data = readl(bit >= 16 ? reg + 0x4 : reg);
data >>= bit % 16;
} else {
data = readl(reg);
data >>= bit;
}
return data & (0x1);
}
static int rockchip_gpio_get_direction(struct gpio_chip *chip,
unsigned int offset)
{
struct rockchip_pin_bank *bank = gpiochip_get_data(chip);
u32 data;
data = rockchip_gpio_readl_bit(bank, offset, bank->gpio_regs->port_ddr);
if (data)
return GPIO_LINE_DIRECTION_OUT;
return GPIO_LINE_DIRECTION_IN;
}
static int rockchip_gpio_set_direction(struct gpio_chip *chip,
unsigned int offset, bool input)
{
struct rockchip_pin_bank *bank = gpiochip_get_data(chip);
unsigned long flags;
u32 data = input ? 0 : 1;
if (input)
pinctrl_gpio_direction_input(bank->pin_base + offset);
else
pinctrl_gpio_direction_output(bank->pin_base + offset);
raw_spin_lock_irqsave(&bank->slock, flags);
rockchip_gpio_writel_bit(bank, offset, data, bank->gpio_regs->port_ddr);
raw_spin_unlock_irqrestore(&bank->slock, flags);
return 0;
}
static void rockchip_gpio_set(struct gpio_chip *gc, unsigned int offset,
int value)
{
struct rockchip_pin_bank *bank = gpiochip_get_data(gc);
unsigned long flags;
raw_spin_lock_irqsave(&bank->slock, flags);
rockchip_gpio_writel_bit(bank, offset, value, bank->gpio_regs->port_dr);
raw_spin_unlock_irqrestore(&bank->slock, flags);
}
static int rockchip_gpio_get(struct gpio_chip *gc, unsigned int offset)
{
struct rockchip_pin_bank *bank = gpiochip_get_data(gc);
u32 data;
data = readl(bank->reg_base + bank->gpio_regs->ext_port);
data >>= offset;
data &= 1;
return data;
}
static int rockchip_gpio_set_debounce(struct gpio_chip *gc,
unsigned int offset,
unsigned int debounce)
{
struct rockchip_pin_bank *bank = gpiochip_get_data(gc);
const struct rockchip_gpio_regs *reg = bank->gpio_regs;
unsigned long flags, div_reg, freq, max_debounce;
bool div_debounce_support;
unsigned int cur_div_reg;
u64 div;
if (bank->gpio_type == GPIO_TYPE_V2 && !IS_ERR(bank->db_clk)) {
div_debounce_support = true;
freq = clk_get_rate(bank->db_clk);
max_debounce = (GENMASK(23, 0) + 1) * 2 * 1000000 / freq;
if (debounce > max_debounce)
return -EINVAL;
div = debounce * freq;
div_reg = DIV_ROUND_CLOSEST_ULL(div, 2 * USEC_PER_SEC) - 1;
} else {
div_debounce_support = false;
}
raw_spin_lock_irqsave(&bank->slock, flags);
/* Only the v1 needs to configure div_en and div_con for dbclk */
if (debounce) {
if (div_debounce_support) {
/* Configure the max debounce from consumers */
cur_div_reg = readl(bank->reg_base +
reg->dbclk_div_con);
if (cur_div_reg < div_reg)
writel(div_reg, bank->reg_base +
reg->dbclk_div_con);
rockchip_gpio_writel_bit(bank, offset, 1,
reg->dbclk_div_en);
}
rockchip_gpio_writel_bit(bank, offset, 1, reg->debounce);
} else {
if (div_debounce_support)
rockchip_gpio_writel_bit(bank, offset, 0,
reg->dbclk_div_en);
rockchip_gpio_writel_bit(bank, offset, 0, reg->debounce);
}
raw_spin_unlock_irqrestore(&bank->slock, flags);
/* Enable or disable dbclk at last */
if (div_debounce_support) {
if (debounce)
clk_prepare_enable(bank->db_clk);
else
clk_disable_unprepare(bank->db_clk);
}
return 0;
}
static int rockchip_gpio_direction_input(struct gpio_chip *gc,
unsigned int offset)
{
return rockchip_gpio_set_direction(gc, offset, true);
}
static int rockchip_gpio_direction_output(struct gpio_chip *gc,
unsigned int offset, int value)
{
rockchip_gpio_set(gc, offset, value);
return rockchip_gpio_set_direction(gc, offset, false);
}
/*
* gpiolib set_config callback function. The setting of the pin
* mux function as 'gpio output' will be handled by the pinctrl subsystem
* interface.
*/
static int rockchip_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
unsigned long config)
{
enum pin_config_param param = pinconf_to_config_param(config);
switch (param) {
case PIN_CONFIG_INPUT_DEBOUNCE:
rockchip_gpio_set_debounce(gc, offset, true);
/*
* Rockchip's gpio could only support up to one period
* of the debounce clock(pclk), which is far away from
* satisftying the requirement, as pclk is usually near
* 100MHz shared by all peripherals. So the fact is it
* has crippled debounce capability could only be useful
* to prevent any spurious glitches from waking up the system
* if the gpio is conguired as wakeup interrupt source. Let's
* still return -ENOTSUPP as before, to make sure the caller
* of gpiod_set_debounce won't change its behaviour.
*/
return -ENOTSUPP;
default:
return -ENOTSUPP;
}
}
/*
* gpiod_to_irq() callback function. Creates a mapping between a GPIO pin
* and a virtual IRQ, if not already present.
*/
static int rockchip_gpio_to_irq(struct gpio_chip *gc, unsigned int offset)
{
struct rockchip_pin_bank *bank = gpiochip_get_data(gc);
unsigned int virq;
if (!bank->domain)
return -ENXIO;
virq = irq_create_mapping(bank->domain, offset);
return (virq) ? : -ENXIO;
}
static const struct gpio_chip rockchip_gpiolib_chip = {
.request = gpiochip_generic_request,
.free = gpiochip_generic_free,
.set = rockchip_gpio_set,
.get = rockchip_gpio_get,
.get_direction = rockchip_gpio_get_direction,
.direction_input = rockchip_gpio_direction_input,
.direction_output = rockchip_gpio_direction_output,
.set_config = rockchip_gpio_set_config,
.to_irq = rockchip_gpio_to_irq,
.owner = THIS_MODULE,
};
static void rockchip_irq_demux(struct irq_desc *desc)
{
struct irq_chip *chip = irq_desc_get_chip(desc);
struct rockchip_pin_bank *bank = irq_desc_get_handler_data(desc);
unsigned long pending;
unsigned int irq;
dev_dbg(bank->dev, "got irq for bank %s\n", bank->name);
chained_irq_enter(chip, desc);
pending = readl_relaxed(bank->reg_base + bank->gpio_regs->int_status);
for_each_set_bit(irq, &pending, 32) {
dev_dbg(bank->dev, "handling irq %d\n", irq);
/*
* Triggering IRQ on both rising and falling edge
* needs manual intervention.
*/
if (bank->toggle_edge_mode & BIT(irq)) {
u32 data, data_old, polarity;
unsigned long flags;
data = readl_relaxed(bank->reg_base +
bank->gpio_regs->ext_port);
do {
raw_spin_lock_irqsave(&bank->slock, flags);
polarity = readl_relaxed(bank->reg_base +
bank->gpio_regs->int_polarity);
if (data & BIT(irq))
polarity &= ~BIT(irq);
else
polarity |= BIT(irq);
writel(polarity,
bank->reg_base +
bank->gpio_regs->int_polarity);
raw_spin_unlock_irqrestore(&bank->slock, flags);
data_old = data;
data = readl_relaxed(bank->reg_base +
bank->gpio_regs->ext_port);
} while ((data & BIT(irq)) != (data_old & BIT(irq)));
}
generic_handle_domain_irq(bank->domain, irq);
}
chained_irq_exit(chip, desc);
}
static int rockchip_irq_set_type(struct irq_data *d, unsigned int type)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct rockchip_pin_bank *bank = gc->private;
u32 mask = BIT(d->hwirq);
u32 polarity;
u32 level;
u32 data;
unsigned long flags;
int ret = 0;
raw_spin_lock_irqsave(&bank->slock, flags);
rockchip_gpio_writel_bit(bank, d->hwirq, 0,
bank->gpio_regs->port_ddr);
raw_spin_unlock_irqrestore(&bank->slock, flags);
if (type & IRQ_TYPE_EDGE_BOTH)
irq_set_handler_locked(d, handle_edge_irq);
else
irq_set_handler_locked(d, handle_level_irq);
raw_spin_lock_irqsave(&bank->slock, flags);
level = rockchip_gpio_readl(bank, bank->gpio_regs->int_type);
polarity = rockchip_gpio_readl(bank, bank->gpio_regs->int_polarity);
if (type == IRQ_TYPE_EDGE_BOTH) {
if (bank->gpio_type == GPIO_TYPE_V2) {
rockchip_gpio_writel_bit(bank, d->hwirq, 1,
bank->gpio_regs->int_bothedge);
goto out;
} else {
bank->toggle_edge_mode |= mask;
level &= ~mask;
/*
* Determine gpio state. If 1 next interrupt should be
* low otherwise high.
*/
data = readl(bank->reg_base + bank->gpio_regs->ext_port);
if (data & mask)
polarity &= ~mask;
else
polarity |= mask;
}
} else {
if (bank->gpio_type == GPIO_TYPE_V2) {
rockchip_gpio_writel_bit(bank, d->hwirq, 0,
bank->gpio_regs->int_bothedge);
} else {
bank->toggle_edge_mode &= ~mask;
}
switch (type) {
case IRQ_TYPE_EDGE_RISING:
level |= mask;
polarity |= mask;
break;
case IRQ_TYPE_EDGE_FALLING:
level |= mask;
polarity &= ~mask;
break;
case IRQ_TYPE_LEVEL_HIGH:
level &= ~mask;
polarity |= mask;
break;
case IRQ_TYPE_LEVEL_LOW:
level &= ~mask;
polarity &= ~mask;
break;
default:
ret = -EINVAL;
goto out;
}
}
rockchip_gpio_writel(bank, level, bank->gpio_regs->int_type);
rockchip_gpio_writel(bank, polarity, bank->gpio_regs->int_polarity);
out:
raw_spin_unlock_irqrestore(&bank->slock, flags);
return ret;
}
static int rockchip_irq_reqres(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct rockchip_pin_bank *bank = gc->private;
return gpiochip_reqres_irq(&bank->gpio_chip, d->hwirq);
}
static void rockchip_irq_relres(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct rockchip_pin_bank *bank = gc->private;
gpiochip_relres_irq(&bank->gpio_chip, d->hwirq);
}
static void rockchip_irq_suspend(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct rockchip_pin_bank *bank = gc->private;
bank->saved_masks = irq_reg_readl(gc, bank->gpio_regs->int_mask);
irq_reg_writel(gc, ~gc->wake_active, bank->gpio_regs->int_mask);
}
static void rockchip_irq_resume(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct rockchip_pin_bank *bank = gc->private;
irq_reg_writel(gc, bank->saved_masks, bank->gpio_regs->int_mask);
}
static void rockchip_irq_enable(struct irq_data *d)
{
irq_gc_mask_clr_bit(d);
}
static void rockchip_irq_disable(struct irq_data *d)
{
irq_gc_mask_set_bit(d);
}
static int rockchip_interrupts_register(struct rockchip_pin_bank *bank)
{
unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
struct irq_chip_generic *gc;
int ret;
bank->domain = irq_domain_add_linear(bank->of_node, 32,
&irq_generic_chip_ops, NULL);
if (!bank->domain) {
dev_warn(bank->dev, "could not init irq domain for bank %s\n",
bank->name);
return -EINVAL;
}
ret = irq_alloc_domain_generic_chips(bank->domain, 32, 1,
"rockchip_gpio_irq",
handle_level_irq,
clr, 0, 0);
if (ret) {
dev_err(bank->dev, "could not alloc generic chips for bank %s\n",
bank->name);
irq_domain_remove(bank->domain);
return -EINVAL;
}
gc = irq_get_domain_generic_chip(bank->domain, 0);
if (bank->gpio_type == GPIO_TYPE_V2) {
gc->reg_writel = gpio_writel_v2;
gc->reg_readl = gpio_readl_v2;
}
gc->reg_base = bank->reg_base;
gc->private = bank;
gc->chip_types[0].regs.mask = bank->gpio_regs->int_mask;
gc->chip_types[0].regs.ack = bank->gpio_regs->port_eoi;
gc->chip_types[0].chip.irq_ack = irq_gc_ack_set_bit;
gc->chip_types[0].chip.irq_mask = irq_gc_mask_set_bit;
gc->chip_types[0].chip.irq_unmask = irq_gc_mask_clr_bit;
gc->chip_types[0].chip.irq_enable = rockchip_irq_enable;
gc->chip_types[0].chip.irq_disable = rockchip_irq_disable;
gc->chip_types[0].chip.irq_set_wake = irq_gc_set_wake;
gc->chip_types[0].chip.irq_suspend = rockchip_irq_suspend;
gc->chip_types[0].chip.irq_resume = rockchip_irq_resume;
gc->chip_types[0].chip.irq_set_type = rockchip_irq_set_type;
gc->chip_types[0].chip.irq_request_resources = rockchip_irq_reqres;
gc->chip_types[0].chip.irq_release_resources = rockchip_irq_relres;
gc->wake_enabled = IRQ_MSK(bank->nr_pins);
/*
* Linux assumes that all interrupts start out disabled/masked.
* Our driver only uses the concept of masked and always keeps
* things enabled, so for us that's all masked and all enabled.
*/
rockchip_gpio_writel(bank, 0xffffffff, bank->gpio_regs->int_mask);
rockchip_gpio_writel(bank, 0xffffffff, bank->gpio_regs->port_eoi);
rockchip_gpio_writel(bank, 0xffffffff, bank->gpio_regs->int_en);
gc->mask_cache = 0xffffffff;
irq_set_chained_handler_and_data(bank->irq,
rockchip_irq_demux, bank);
return 0;
}
static int rockchip_gpiolib_register(struct rockchip_pin_bank *bank)
{
struct gpio_chip *gc;
int ret;
bank->gpio_chip = rockchip_gpiolib_chip;
gc = &bank->gpio_chip;
gc->base = bank->pin_base;
gc->ngpio = bank->nr_pins;
gc->label = bank->name;
gc->parent = bank->dev;
ret = gpiochip_add_data(gc, bank);
if (ret) {
dev_err(bank->dev, "failed to add gpiochip %s, %d\n",
gc->label, ret);
return ret;
}
/*
* For DeviceTree-supported systems, the gpio core checks the
* pinctrl's device node for the "gpio-ranges" property.
* If it is present, it takes care of adding the pin ranges
* for the driver. In this case the driver can skip ahead.
*
* In order to remain compatible with older, existing DeviceTree
* files which don't set the "gpio-ranges" property or systems that
* utilize ACPI the driver has to call gpiochip_add_pin_range().
*/
if (!of_property_read_bool(bank->of_node, "gpio-ranges")) {
struct device_node *pctlnp = of_get_parent(bank->of_node);
struct pinctrl_dev *pctldev = NULL;
if (!pctlnp)
return -ENODATA;
pctldev = of_pinctrl_get(pctlnp);
of_node_put(pctlnp);
if (!pctldev)
return -ENODEV;
ret = gpiochip_add_pin_range(gc, dev_name(pctldev->dev), 0,
gc->base, gc->ngpio);
if (ret) {
dev_err(bank->dev, "Failed to add pin range\n");
goto fail;
}
}
ret = rockchip_interrupts_register(bank);
if (ret) {
dev_err(bank->dev, "failed to register interrupt, %d\n", ret);
goto fail;
}
return 0;
fail:
gpiochip_remove(&bank->gpio_chip);
return ret;
}
static int rockchip_get_bank_data(struct rockchip_pin_bank *bank)
{
struct resource res;
int id = 0;
if (of_address_to_resource(bank->of_node, 0, &res)) {
dev_err(bank->dev, "cannot find IO resource for bank\n");
return -ENOENT;
}
bank->reg_base = devm_ioremap_resource(bank->dev, &res);
if (IS_ERR(bank->reg_base))
return PTR_ERR(bank->reg_base);
bank->irq = irq_of_parse_and_map(bank->of_node, 0);
if (!bank->irq)
return -EINVAL;
bank->clk = of_clk_get(bank->of_node, 0);
if (IS_ERR(bank->clk))
return PTR_ERR(bank->clk);
clk_prepare_enable(bank->clk);
id = readl(bank->reg_base + gpio_regs_v2.version_id);
/* If not gpio v2, that is default to v1. */
if (id == GPIO_TYPE_V2 || id == GPIO_TYPE_V2_1) {
bank->gpio_regs = &gpio_regs_v2;
bank->gpio_type = GPIO_TYPE_V2;
bank->db_clk = of_clk_get(bank->of_node, 1);
if (IS_ERR(bank->db_clk)) {
dev_err(bank->dev, "cannot find debounce clk\n");
clk_disable_unprepare(bank->clk);
return -EINVAL;
}
} else {
bank->gpio_regs = &gpio_regs_v1;
bank->gpio_type = GPIO_TYPE_V1;
}
return 0;
}
static struct rockchip_pin_bank *
rockchip_gpio_find_bank(struct pinctrl_dev *pctldev, int id)
{
struct rockchip_pinctrl *info;
struct rockchip_pin_bank *bank;
int i, found = 0;
info = pinctrl_dev_get_drvdata(pctldev);
bank = info->ctrl->pin_banks;
for (i = 0; i < info->ctrl->nr_banks; i++, bank++) {
if (bank->bank_num == id) {
found = 1;
break;
}
}
return found ? bank : NULL;
}
static int rockchip_gpio_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct device_node *pctlnp = of_get_parent(np);
struct pinctrl_dev *pctldev = NULL;
struct rockchip_pin_bank *bank = NULL;
struct rockchip_pin_deferred *cfg;
static int gpio;
int id, ret;
if (!np || !pctlnp)
return -ENODEV;
pctldev = of_pinctrl_get(pctlnp);
if (!pctldev)
return -EPROBE_DEFER;
id = of_alias_get_id(np, "gpio");
if (id < 0)
id = gpio++;
bank = rockchip_gpio_find_bank(pctldev, id);
if (!bank)
return -EINVAL;
bank->dev = dev;
bank->of_node = np;
raw_spin_lock_init(&bank->slock);
ret = rockchip_get_bank_data(bank);
if (ret)
return ret;
/*
* Prevent clashes with a deferred output setting
* being added right at this moment.
*/
mutex_lock(&bank->deferred_lock);
ret = rockchip_gpiolib_register(bank);
if (ret) {
clk_disable_unprepare(bank->clk);
mutex_unlock(&bank->deferred_lock);
return ret;
}
while (!list_empty(&bank->deferred_pins)) {
cfg = list_first_entry(&bank->deferred_pins,
struct rockchip_pin_deferred, head);
list_del(&cfg->head);
switch (cfg->param) {
case PIN_CONFIG_OUTPUT:
ret = rockchip_gpio_direction_output(&bank->gpio_chip, cfg->pin, cfg->arg);
if (ret)
dev_warn(dev, "setting output pin %u to %u failed\n", cfg->pin,
cfg->arg);
break;
case PIN_CONFIG_INPUT_ENABLE:
ret = rockchip_gpio_direction_input(&bank->gpio_chip, cfg->pin);
if (ret)
dev_warn(dev, "setting input pin %u failed\n", cfg->pin);
break;
default:
dev_warn(dev, "unknown deferred config param %d\n", cfg->param);
break;
}
kfree(cfg);
}
mutex_unlock(&bank->deferred_lock);
platform_set_drvdata(pdev, bank);
dev_info(dev, "probed %pOF\n", np);
return 0;
}
static int rockchip_gpio_remove(struct platform_device *pdev)
{
struct rockchip_pin_bank *bank = platform_get_drvdata(pdev);
clk_disable_unprepare(bank->clk);
gpiochip_remove(&bank->gpio_chip);
return 0;
}
static const struct of_device_id rockchip_gpio_match[] = {
{ .compatible = "rockchip,gpio-bank", },
{ .compatible = "rockchip,rk3188-gpio-bank0" },
{ },
};
static struct platform_driver rockchip_gpio_driver = {
.probe = rockchip_gpio_probe,
.remove = rockchip_gpio_remove,
.driver = {
.name = "rockchip-gpio",
.of_match_table = rockchip_gpio_match,
},
};
static int __init rockchip_gpio_init(void)
{
return platform_driver_register(&rockchip_gpio_driver);
}
postcore_initcall(rockchip_gpio_init);
static void __exit rockchip_gpio_exit(void)
{
platform_driver_unregister(&rockchip_gpio_driver);
}
module_exit(rockchip_gpio_exit);
MODULE_DESCRIPTION("Rockchip gpio driver");
MODULE_ALIAS("platform:rockchip-gpio");
MODULE_LICENSE("GPL v2");
MODULE_DEVICE_TABLE(of, rockchip_gpio_match);
