diff options
Diffstat (limited to 'drivers/pinctrl/bcm/pinctrl-iproc-gpio.c')
| -rw-r--r-- | drivers/pinctrl/bcm/pinctrl-iproc-gpio.c | 758 |
1 files changed, 758 insertions, 0 deletions
diff --git a/drivers/pinctrl/bcm/pinctrl-iproc-gpio.c b/drivers/pinctrl/bcm/pinctrl-iproc-gpio.c new file mode 100644 index 000000000000..314591a4609b --- /dev/null +++ b/drivers/pinctrl/bcm/pinctrl-iproc-gpio.c @@ -0,0 +1,758 @@ +/* + * Copyright (C) 2014-2015 Broadcom Corporation + * + * 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 version 2. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * This file contains the Broadcom Iproc GPIO driver that supports 3 + * GPIO controllers on Iproc including the ASIU GPIO controller, the + * chipCommonG GPIO controller, and the always-on GPIO controller. Basic + * PINCONF such as bias pull up/down, and drive strength are also supported + * in this driver. + * + * It provides the functionality where pins from the GPIO can be + * individually muxed to GPIO function, if individual pad + * configuration is supported, through the interaction with respective + * SoCs IOMUX controller. + */ + +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/gpio.h> +#include <linux/ioport.h> +#include <linux/of_device.h> +#include <linux/of_irq.h> +#include <linux/pinctrl/pinctrl.h> +#include <linux/pinctrl/pinconf.h> +#include <linux/pinctrl/pinconf-generic.h> + +#include "../pinctrl-utils.h" + +#define IPROC_GPIO_DATA_IN_OFFSET 0x00 +#define IPROC_GPIO_DATA_OUT_OFFSET 0x04 +#define IPROC_GPIO_OUT_EN_OFFSET 0x08 +#define IPROC_GPIO_INT_TYPE_OFFSET 0x0c +#define IPROC_GPIO_INT_DE_OFFSET 0x10 +#define IPROC_GPIO_INT_EDGE_OFFSET 0x14 +#define IPROC_GPIO_INT_MSK_OFFSET 0x18 +#define IPROC_GPIO_INT_STAT_OFFSET 0x1c +#define IPROC_GPIO_INT_MSTAT_OFFSET 0x20 +#define IPROC_GPIO_INT_CLR_OFFSET 0x24 +#define IPROC_GPIO_PAD_RES_OFFSET 0x34 +#define IPROC_GPIO_RES_EN_OFFSET 0x38 + +/* drive strength control for ASIU GPIO */ +#define IPROC_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58 + +/* drive strength control for CCM/CRMU (AON) GPIO */ +#define IPROC_GPIO_DRV0_CTRL_OFFSET 0x00 + +#define GPIO_BANK_SIZE 0x200 +#define NGPIOS_PER_BANK 32 +#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK) + +#define IPROC_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg)) +#define IPROC_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK) + +#define GPIO_DRV_STRENGTH_BIT_SHIFT 20 +#define GPIO_DRV_STRENGTH_BITS 3 +#define GPIO_DRV_STRENGTH_BIT_MASK ((1 << GPIO_DRV_STRENGTH_BITS) - 1) + +/* + * Iproc GPIO core + * + * @dev: pointer to device + * @base: I/O register base for Iproc GPIO controller + * @io_ctrl: I/O register base for certain type of Iproc GPIO controller that + * has the PINCONF support implemented outside of the GPIO block + * @lock: lock to protect access to I/O registers + * @gc: GPIO chip + * @num_banks: number of GPIO banks, each bank supports up to 32 GPIOs + * @pinmux_is_supported: flag to indicate this GPIO controller contains pins + * that can be individually muxed to GPIO + * @pctl: pointer to pinctrl_dev + * @pctldesc: pinctrl descriptor + */ +struct iproc_gpio { + struct device *dev; + + void __iomem *base; + void __iomem *io_ctrl; + + spinlock_t lock; + + struct gpio_chip gc; + unsigned num_banks; + + bool pinmux_is_supported; + + struct pinctrl_dev *pctl; + struct pinctrl_desc pctldesc; +}; + +static inline struct iproc_gpio *to_iproc_gpio(struct gpio_chip *gc) +{ + return container_of(gc, struct iproc_gpio, gc); +} + +/* + * Mapping from PINCONF pins to GPIO pins is 1-to-1 + */ +static inline unsigned iproc_pin_to_gpio(unsigned pin) +{ + return pin; +} + +/** + * iproc_set_bit - set or clear one bit (corresponding to the GPIO pin) in a + * Iproc GPIO register + * + * @iproc_gpio: Iproc GPIO device + * @reg: register offset + * @gpio: GPIO pin + * @set: set or clear + */ +static inline void iproc_set_bit(struct iproc_gpio *chip, unsigned int reg, + unsigned gpio, bool set) +{ + unsigned int offset = IPROC_GPIO_REG(gpio, reg); + unsigned int shift = IPROC_GPIO_SHIFT(gpio); + u32 val; + + val = readl(chip->base + offset); + if (set) + val |= BIT(shift); + else + val &= ~BIT(shift); + writel(val, chip->base + offset); +} + +static inline bool iproc_get_bit(struct iproc_gpio *chip, unsigned int reg, + unsigned gpio) +{ + unsigned int offset = IPROC_GPIO_REG(gpio, reg); + unsigned int shift = IPROC_GPIO_SHIFT(gpio); + + return !!(readl(chip->base + offset) & BIT(shift)); +} + +static void iproc_gpio_irq_handler(struct irq_desc *desc) +{ + struct gpio_chip *gc = irq_desc_get_handler_data(desc); + struct iproc_gpio *chip = to_iproc_gpio(gc); + struct irq_chip *irq_chip = irq_desc_get_chip(desc); + int i, bit; + + chained_irq_enter(irq_chip, desc); + + /* go through the entire GPIO banks and handle all interrupts */ + for (i = 0; i < chip->num_banks; i++) { + unsigned long val = readl(chip->base + (i * GPIO_BANK_SIZE) + + IPROC_GPIO_INT_MSTAT_OFFSET); + + for_each_set_bit(bit, &val, NGPIOS_PER_BANK) { + unsigned pin = NGPIOS_PER_BANK * i + bit; + int child_irq = irq_find_mapping(gc->irqdomain, pin); + + /* + * Clear the interrupt before invoking the + * handler, so we do not leave any window + */ + writel(BIT(bit), chip->base + (i * GPIO_BANK_SIZE) + + IPROC_GPIO_INT_CLR_OFFSET); + + generic_handle_irq(child_irq); + } + } + + chained_irq_exit(irq_chip, desc); +} + + +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 = to_iproc_gpio(gc); + unsigned gpio = d->hwirq; + unsigned int offset = IPROC_GPIO_REG(gpio, + IPROC_GPIO_INT_CLR_OFFSET); + unsigned int shift = IPROC_GPIO_SHIFT(gpio); + u32 val = BIT(shift); + + writel(val, chip->base + offset); +} + +/** + * iproc_gpio_irq_set_mask - mask/unmask a GPIO interrupt + * + * @d: IRQ chip data + * @unmask: mask/unmask GPIO interrupt + */ +static void iproc_gpio_irq_set_mask(struct irq_data *d, bool unmask) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + struct iproc_gpio *chip = to_iproc_gpio(gc); + unsigned gpio = d->hwirq; + + iproc_set_bit(chip, IPROC_GPIO_INT_MSK_OFFSET, gpio, unmask); +} + +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 = to_iproc_gpio(gc); + unsigned long flags; + + spin_lock_irqsave(&chip->lock, flags); + iproc_gpio_irq_set_mask(d, false); + 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 = to_iproc_gpio(gc); + unsigned long flags; + + spin_lock_irqsave(&chip->lock, flags); + iproc_gpio_irq_set_mask(d, true); + spin_unlock_irqrestore(&chip->lock, flags); +} + +static int iproc_gpio_irq_set_type(struct irq_data *d, unsigned int type) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + struct iproc_gpio *chip = to_iproc_gpio(gc); + unsigned gpio = d->hwirq; + bool level_triggered = false; + bool dual_edge = false; + bool rising_or_high = false; + unsigned long flags; + + switch (type & IRQ_TYPE_SENSE_MASK) { + case IRQ_TYPE_EDGE_RISING: + rising_or_high = true; + break; + + case IRQ_TYPE_EDGE_FALLING: + break; + + case IRQ_TYPE_EDGE_BOTH: + dual_edge = true; + break; + + case IRQ_TYPE_LEVEL_HIGH: + level_triggered = true; + rising_or_high = true; + break; + + case IRQ_TYPE_LEVEL_LOW: + level_triggered = true; + break; + + default: + dev_err(chip->dev, "invalid GPIO IRQ type 0x%x\n", + type); + return -EINVAL; + } + + spin_lock_irqsave(&chip->lock, flags); + iproc_set_bit(chip, IPROC_GPIO_INT_TYPE_OFFSET, gpio, + level_triggered); + iproc_set_bit(chip, IPROC_GPIO_INT_DE_OFFSET, gpio, dual_edge); + iproc_set_bit(chip, IPROC_GPIO_INT_EDGE_OFFSET, gpio, + rising_or_high); + spin_unlock_irqrestore(&chip->lock, flags); + + dev_dbg(chip->dev, + "gpio:%u level_triggered:%d dual_edge:%d rising_or_high:%d\n", + gpio, level_triggered, dual_edge, rising_or_high); + + return 0; +} + +static struct irq_chip iproc_gpio_irq_chip = { + .name = "bcm-iproc-gpio", + .irq_ack = iproc_gpio_irq_ack, + .irq_mask = iproc_gpio_irq_mask, + .irq_unmask = iproc_gpio_irq_unmask, + .irq_set_type = iproc_gpio_irq_set_type, +}; + +/* + * Request the Iproc IOMUX pinmux controller to mux individual pins to GPIO + */ +static int iproc_gpio_request(struct gpio_chip *gc, unsigned offset) +{ + struct iproc_gpio *chip = to_iproc_gpio(gc); + unsigned gpio = gc->base + offset; + + /* not all Iproc GPIO pins can be muxed individually */ + if (!chip->pinmux_is_supported) + return 0; + + return pinctrl_request_gpio(gpio); +} + +static void iproc_gpio_free(struct gpio_chip *gc, unsigned offset) +{ + struct iproc_gpio *chip = to_iproc_gpio(gc); + unsigned gpio = gc->base + offset; + + if (!chip->pinmux_is_supported) + return; + + pinctrl_free_gpio(gpio); +} + +static int iproc_gpio_direction_input(struct gpio_chip *gc, unsigned gpio) +{ + struct iproc_gpio *chip = to_iproc_gpio(gc); + unsigned long flags; + + spin_lock_irqsave(&chip->lock, flags); + iproc_set_bit(chip, IPROC_GPIO_OUT_EN_OFFSET, gpio, false); + spin_unlock_irqrestore(&chip->lock, flags); + + dev_dbg(chip->dev, "gpio:%u set input\n", gpio); + + return 0; +} + +static int iproc_gpio_direction_output(struct gpio_chip *gc, unsigned gpio, + int val) +{ + struct iproc_gpio *chip = to_iproc_gpio(gc); + unsigned long flags; + + spin_lock_irqsave(&chip->lock, flags); + iproc_set_bit(chip, IPROC_GPIO_OUT_EN_OFFSET, gpio, true); + iproc_set_bit(chip, IPROC_GPIO_DATA_OUT_OFFSET, gpio, !!(val)); + spin_unlock_irqrestore(&chip->lock, flags); + + dev_dbg(chip->dev, "gpio:%u set output, value:%d\n", gpio, val); + + return 0; +} + +static void iproc_gpio_set(struct gpio_chip *gc, unsigned gpio, int val) +{ + struct iproc_gpio *chip = to_iproc_gpio(gc); + unsigned long flags; + + spin_lock_irqsave(&chip->lock, flags); + iproc_set_bit(chip, IPROC_GPIO_DATA_OUT_OFFSET, gpio, !!(val)); + spin_unlock_irqrestore(&chip->lock, flags); + + dev_dbg(chip->dev, "gpio:%u set, value:%d\n", gpio, val); +} + +static int iproc_gpio_get(struct gpio_chip *gc, unsigned gpio) +{ + struct iproc_gpio *chip = to_iproc_gpio(gc); + unsigned int offset = IPROC_GPIO_REG(gpio, + IPROC_GPIO_DATA_IN_OFFSET); + unsigned int shift = IPROC_GPIO_SHIFT(gpio); + + return !!(readl(chip->base + offset) & BIT(shift)); +} + +static int iproc_get_groups_count(struct pinctrl_dev *pctldev) +{ + return 1; +} + +/* + * Only one group: "gpio_grp", since this local pinctrl device only performs + * GPIO specific PINCONF configurations + */ +static const char *iproc_get_group_name(struct pinctrl_dev *pctldev, + unsigned selector) +{ + return "gpio_grp"; +} + +static const struct pinctrl_ops iproc_pctrl_ops = { + .get_groups_count = iproc_get_groups_count, + .get_group_name = iproc_get_group_name, + .dt_node_to_map = pinconf_generic_dt_node_to_map_pin, + .dt_free_map = pinctrl_utils_dt_free_map, +}; + +static int iproc_gpio_set_pull(struct iproc_gpio *chip, unsigned gpio, + bool disable, bool pull_up) +{ + unsigned long flags; + + spin_lock_irqsave(&chip->lock, flags); + + if (disable) { + iproc_set_bit(chip, IPROC_GPIO_RES_EN_OFFSET, gpio, false); + } else { + iproc_set_bit(chip, IPROC_GPIO_PAD_RES_OFFSET, gpio, + pull_up); + iproc_set_bit(chip, IPROC_GPIO_RES_EN_OFFSET, gpio, true); + } + + spin_unlock_irqrestore(&chip->lock, flags); + + dev_dbg(chip->dev, "gpio:%u set pullup:%d\n", gpio, pull_up); + + return 0; +} + +static void iproc_gpio_get_pull(struct iproc_gpio *chip, unsigned gpio, + bool *disable, bool *pull_up) +{ + unsigned long flags; + + spin_lock_irqsave(&chip->lock, flags); + *disable = !iproc_get_bit(chip, IPROC_GPIO_RES_EN_OFFSET, gpio); + *pull_up = iproc_get_bit(chip, IPROC_GPIO_PAD_RES_OFFSET, gpio); + spin_unlock_irqrestore(&chip->lock, flags); +} + +static int iproc_gpio_set_strength(struct iproc_gpio *chip, unsigned gpio, + unsigned strength) +{ + void __iomem *base; + unsigned int i, offset, shift; + u32 val; + unsigned long flags; + + /* make sure drive strength is supported */ + if (strength < 2 || strength > 16 || (strength % 2)) + return -ENOTSUPP; + + if (chip->io_ctrl) { + base = chip->io_ctrl; + offset = IPROC_GPIO_DRV0_CTRL_OFFSET; + } else { + base = chip->base; + offset = IPROC_GPIO_REG(gpio, + IPROC_GPIO_ASIU_DRV0_CTRL_OFFSET); + } + + shift = IPROC_GPIO_SHIFT(gpio); + + dev_dbg(chip->dev, "gpio:%u set drive strength:%d mA\n", gpio, + strength); + + spin_lock_irqsave(&chip->lock, flags); + strength = (strength / 2) - 1; + for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) { + val = readl(base + offset); + val &= ~BIT(shift); + val |= ((strength >> i) & 0x1) << shift; + writel(val, base + offset); + offset += 4; + } + spin_unlock_irqrestore(&chip->lock, flags); + + return 0; +} + +static int iproc_gpio_get_strength(struct iproc_gpio *chip, unsigned gpio, + u16 *strength) +{ + void __iomem *base; + unsigned int i, offset, shift; + u32 val; + unsigned long flags; + + if (chip->io_ctrl) { + base = chip->io_ctrl; + offset = IPROC_GPIO_DRV0_CTRL_OFFSET; + } else { + base = chip->base; + offset = IPROC_GPIO_REG(gpio, + IPROC_GPIO_ASIU_DRV0_CTRL_OFFSET); + } + + shift = IPROC_GPIO_SHIFT(gpio); + + spin_lock_irqsave(&chip->lock, flags); + *strength = 0; + for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) { + val = readl(base + offset) & BIT(shift); + val >>= shift; + *strength += (val << i); + offset += 4; + } + + /* convert to mA */ + *strength = (*strength + 1) * 2; + spin_unlock_irqrestore(&chip->lock, flags); + + return 0; +} + +static int iproc_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin, + unsigned long *config) +{ + struct iproc_gpio *chip = pinctrl_dev_get_drvdata(pctldev); + enum pin_config_param param = pinconf_to_config_param(*config); + unsigned gpio = iproc_pin_to_gpio(pin); + u16 arg; + bool disable, pull_up; + int ret; + + switch (param) { + case PIN_CONFIG_BIAS_DISABLE: + iproc_gpio_get_pull(chip, gpio, &disable, &pull_up); + if (disable) + return 0; + else + return -EINVAL; + + case PIN_CONFIG_BIAS_PULL_UP: + iproc_gpio_get_pull(chip, gpio, &disable, &pull_up); + if (!disable && pull_up) + return 0; + else + return -EINVAL; + + case PIN_CONFIG_BIAS_PULL_DOWN: + iproc_gpio_get_pull(chip, gpio, &disable, &pull_up); + if (!disable && !pull_up) + return 0; + else + return -EINVAL; + + case PIN_CONFIG_DRIVE_STRENGTH: + ret = iproc_gpio_get_strength(chip, gpio, &arg); + if (ret) + return ret; + *config = pinconf_to_config_packed(param, arg); + + return 0; + + default: + return -ENOTSUPP; + } + + return -ENOTSUPP; +} + +static int iproc_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin, + unsigned long *configs, unsigned num_configs) +{ + struct iproc_gpio *chip = pinctrl_dev_get_drvdata(pctldev); + enum pin_config_param param; + u16 arg; + unsigned i, gpio = iproc_pin_to_gpio(pin); + int ret = -ENOTSUPP; + + for (i = 0; i < num_configs; i++) { + param = pinconf_to_config_param(configs[i]); + arg = pinconf_to_config_argument(configs[i]); + + switch (param) { + case PIN_CONFIG_BIAS_DISABLE: + ret = iproc_gpio_set_pull(chip, gpio, true, false); + if (ret < 0) + goto out; + break; + + case PIN_CONFIG_BIAS_PULL_UP: + ret = iproc_gpio_set_pull(chip, gpio, false, true); + if (ret < 0) + goto out; + break; + + case PIN_CONFIG_BIAS_PULL_DOWN: + ret = iproc_gpio_set_pull(chip, gpio, false, false); + if (ret < 0) + goto out; + break; + + case PIN_CONFIG_DRIVE_STRENGTH: + ret = iproc_gpio_set_strength(chip, gpio, arg); + if (ret < 0) + goto out; + break; + + default: + dev_err(chip->dev, "invalid configuration\n"); + return -ENOTSUPP; + } + } /* for each config */ + +out: + return ret; +} + +static const struct pinconf_ops iproc_pconf_ops = { + .is_generic = true, + .pin_config_get = iproc_pin_config_get, + .pin_config_set = iproc_pin_config_set, +}; + +/* + * Iproc GPIO controller supports some PINCONF related configurations such as + * pull up, pull down, and drive strength, when the pin is configured to GPIO + * + * Here a local pinctrl device is created with simple 1-to-1 pin mapping to the + * local GPIO pins + */ +static int iproc_gpio_register_pinconf(struct iproc_gpio *chip) +{ + struct pinctrl_desc *pctldesc = &chip->pctldesc; + struct pinctrl_pin_desc *pins; + struct gpio_chip *gc = &chip->gc; + int i; + + pins = devm_kcalloc(chip->dev, gc->ngpio, sizeof(*pins), GFP_KERNEL); + if (!pins) + return -ENOMEM; + + for (i = 0; i < gc->ngpio; i++) { + pins[i].number = i; + pins[i].name = devm_kasprintf(chip->dev, GFP_KERNEL, + "gpio-%d", i); + if (!pins[i].name) + return -ENOMEM; + } + + pctldesc->name = dev_name(chip->dev); + pctldesc->pctlops = &iproc_pctrl_ops; + pctldesc->pins = pins; + pctldesc->npins = gc->ngpio; + pctldesc->confops = &iproc_pconf_ops; + + chip->pctl = pinctrl_register(pctldesc, chip->dev, chip); + if (IS_ERR(chip->pctl)) { + dev_err(chip->dev, "unable to register pinctrl device\n"); + return PTR_ERR(chip->pctl); + } + + return 0; +} + +static void iproc_gpio_unregister_pinconf(struct iproc_gpio *chip) +{ + pinctrl_unregister(chip->pctl); +} + +static const struct of_device_id iproc_gpio_of_match[] = { + { .compatible = "brcm,cygnus-ccm-gpio" }, + { .compatible = "brcm,cygnus-asiu-gpio" }, + { .compatible = "brcm,cygnus-crmu-gpio" }, + { .compatible = "brcm,iproc-gpio" }, + { } +}; + +static int iproc_gpio_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct resource *res; + struct iproc_gpio *chip; + struct gpio_chip *gc; + u32 ngpios; + int irq, ret; + + chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + chip->dev = dev; + platform_set_drvdata(pdev, chip); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + chip->base = devm_ioremap_resource(dev, res); + if (IS_ERR(chip->base)) { + dev_err(dev, "unable to map I/O memory\n"); + return PTR_ERR(chip->base); + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (res) { + chip->io_ctrl = devm_ioremap_resource(dev, res); + if (IS_ERR(chip->io_ctrl)) { + dev_err(dev, "unable to map I/O memory\n"); + return PTR_ERR(chip->io_ctrl); + } + } + + if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) { + dev_err(&pdev->dev, "missing ngpios DT property\n"); + return -ENODEV; + } + + spin_lock_init(&chip->lock); + + gc = &chip->gc; + gc->base = -1; + gc->ngpio = ngpios; + chip->num_banks = (ngpios + NGPIOS_PER_BANK - 1) / NGPIOS_PER_BANK; + gc->label = dev_name(dev); + gc->dev = dev; + gc->of_node = dev->of_node; + gc->request = iproc_gpio_request; + gc->free = iproc_gpio_free; + gc->direction_input = iproc_gpio_direction_input; + gc->direction_output = iproc_gpio_direction_output; + gc->set = iproc_gpio_set; + gc->get = iproc_gpio_get; + + chip->pinmux_is_supported = of_property_read_bool(dev->of_node, + "gpio-ranges"); + + ret = gpiochip_add(gc); + if (ret < 0) { + dev_err(dev, "unable to add GPIO chip\n"); + return ret; + } + + ret = iproc_gpio_register_pinconf(chip); + if (ret) { + dev_err(dev, "unable to register pinconf\n"); + goto err_rm_gpiochip; + } + + /* optional GPIO interrupt support */ + irq = platform_get_irq(pdev, 0); + if (irq) { + ret = gpiochip_irqchip_add(gc, &iproc_gpio_irq_chip, 0, + handle_simple_irq, IRQ_TYPE_NONE); + if (ret) { + dev_err(dev, "no GPIO irqchip\n"); + goto err_unregister_pinconf; + } + + gpiochip_set_chained_irqchip(gc, &iproc_gpio_irq_chip, irq, + iproc_gpio_irq_handler); + } + + return 0; + +err_unregister_pinconf: + iproc_gpio_unregister_pinconf(chip); + +err_rm_gpiochip: + gpiochip_remove(gc); + + return ret; +} + +static struct platform_driver iproc_gpio_driver = { + .driver = { + .name = "iproc-gpio", + .of_match_table = iproc_gpio_of_match, + }, + .probe = iproc_gpio_probe, +}; + +static int __init iproc_gpio_init(void) +{ + return platform_driver_probe(&iproc_gpio_driver, iproc_gpio_probe); +} +arch_initcall_sync(iproc_gpio_init); |