/*
   * Pinctrl driver for Rockchip SoCs
   *
   * Copyright (c) 2013 MundoReader S.L.
   * Author: Heiko Stuebner <heiko@sntech.de>
   *
   * With some ideas taken from pinctrl-samsung:
   * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   *		http://www.samsung.com
   * Copyright (c) 2012 Linaro Ltd
   *		http://www.linaro.org
   *
   * and pinctrl-at91:
   * Copyright (C) 2011-2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as published
   * by the Free Software Foundation.
   *
   * 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.
   */
  
  #include <linux/module.h>
  #include <linux/platform_device.h>
  #include <linux/io.h>
  #include <linux/bitops.h>
  #include <linux/gpio.h>
  #include <linux/of_address.h>
  #include <linux/of_irq.h>
  #include <linux/pinctrl/machine.h>
  #include <linux/pinctrl/pinconf.h>
  #include <linux/pinctrl/pinctrl.h>
  #include <linux/pinctrl/pinmux.h>
  #include <linux/pinctrl/pinconf-generic.h>
  #include <linux/irqchip/chained_irq.h>
  #include <linux/clk.h>
  #include <dt-bindings/pinctrl/rockchip.h>
  
  #include "core.h"
  #include "pinconf.h"
  
  /* GPIO control registers */
  #define GPIO_SWPORT_DR		0x00
  #define GPIO_SWPORT_DDR		0x04
  #define GPIO_INTEN		0x30
  #define GPIO_INTMASK		0x34
  #define GPIO_INTTYPE_LEVEL	0x38
  #define GPIO_INT_POLARITY	0x3c
  #define GPIO_INT_STATUS		0x40
  #define GPIO_INT_RAWSTATUS	0x44
  #define GPIO_DEBOUNCE		0x48
  #define GPIO_PORTS_EOI		0x4c
  #define GPIO_EXT_PORT		0x50
  #define GPIO_LS_SYNC		0x60
  
  enum rockchip_pinctrl_type {
  	RK2928,
  	RK3066B,
  	RK3188,
  };
  
  enum rockchip_pin_bank_type {
  	COMMON_BANK,
  	RK3188_BANK0,
  };
  
  /**
   * @reg_base: register base of the gpio bank
   * @reg_pull: optional separate register for additional pull settings
   * @clk: clock of the gpio bank
   * @irq: interrupt of the gpio bank
   * @pin_base: first pin number
   * @nr_pins: number of pins in this bank
   * @name: name of the bank
   * @bank_num: number of the bank, to account for holes
   * @valid: are all necessary informations present
   * @of_node: dt node of this bank
   * @drvdata: common pinctrl basedata
   * @domain: irqdomain of the gpio bank
   * @gpio_chip: gpiolib chip
   * @grange: gpio range
   * @slock: spinlock for the gpio bank
   */
  struct rockchip_pin_bank {
  	void __iomem			*reg_base;
  	void __iomem			*reg_pull;
  	struct clk			*clk;
  	int				irq;
  	u32				pin_base;
  	u8				nr_pins;
  	char				*name;
  	u8				bank_num;
  	enum rockchip_pin_bank_type	bank_type;
  	bool				valid;
  	struct device_node		*of_node;
  	struct rockchip_pinctrl		*drvdata;
  	struct irq_domain		*domain;
  	struct gpio_chip		gpio_chip;
  	struct pinctrl_gpio_range	grange;
  	spinlock_t			slock;
  	u32				toggle_edge_mode;
  };
  
  #define PIN_BANK(id, pins, label)			\
  	{						\
  		.bank_num	= id,			\
  		.nr_pins	= pins,			\
  		.name		= label,		\
  	}
  
  /**
   */
  struct rockchip_pin_ctrl {
  	struct rockchip_pin_bank	*pin_banks;
  	u32				nr_banks;
  	u32				nr_pins;
  	char				*label;
  	enum rockchip_pinctrl_type	type;
  	int				mux_offset;
  	void	(*pull_calc_reg)(struct rockchip_pin_bank *bank, int pin_num,
  				 void __iomem **reg, u8 *bit);
  };
  
  struct rockchip_pin_config {
  	unsigned int		func;
  	unsigned long		*configs;
  	unsigned int		nconfigs;
  };
  
  /**
   * struct rockchip_pin_group: represent group of pins of a pinmux function.
   * @name: name of the pin group, used to lookup the group.
   * @pins: the pins included in this group.
   * @npins: number of pins included in this group.
   * @func: the mux function number to be programmed when selected.
   * @configs: the config values to be set for each pin
   * @nconfigs: number of configs for each pin
   */
  struct rockchip_pin_group {
  	const char			*name;
  	unsigned int			npins;
  	unsigned int			*pins;
  	struct rockchip_pin_config	*data;
  };
  
  /**
   * struct rockchip_pmx_func: represent a pin function.
   * @name: name of the pin function, used to lookup the function.
   * @groups: one or more names of pin groups that provide this function.
   * @num_groups: number of groups included in @groups.
   */
  struct rockchip_pmx_func {
  	const char		*name;
  	const char		**groups;
  	u8			ngroups;
  };
  
  struct rockchip_pinctrl {
  	void __iomem			*reg_base;
  	void __iomem			*reg_pull;
  	struct device			*dev;
  	struct rockchip_pin_ctrl	*ctrl;
  	struct pinctrl_desc		pctl;
  	struct pinctrl_dev		*pctl_dev;
  	struct rockchip_pin_group	*groups;
  	unsigned int			ngroups;
  	struct rockchip_pmx_func	*functions;
  	unsigned int			nfunctions;
  };
  
  static inline struct rockchip_pin_bank *gc_to_pin_bank(struct gpio_chip *gc)
  {
  	return container_of(gc, struct rockchip_pin_bank, gpio_chip);
  }
  
  static const inline struct rockchip_pin_group *pinctrl_name_to_group(
  					const struct rockchip_pinctrl *info,
  					const char *name)
  {
  	int i;
  
  	for (i = 0; i < info->ngroups; i++) {
  		if (!strcmp(info->groups[i].name, name))
  			return &info->groups[i];
  	}
  
  	return NULL;
  }
  
  /*
   * given a pin number that is local to a pin controller, find out the pin bank
   * and the register base of the pin bank.
   */
  static struct rockchip_pin_bank *pin_to_bank(struct rockchip_pinctrl *info,
  								unsigned pin)
  {
  	struct rockchip_pin_bank *b = info->ctrl->pin_banks;
  
  	while (pin >= (b->pin_base + b->nr_pins))
  		b++;
  
  	return b;
  }
  
  static struct rockchip_pin_bank *bank_num_to_bank(
  					struct rockchip_pinctrl *info,
  					unsigned num)
  {
  	struct rockchip_pin_bank *b = info->ctrl->pin_banks;
  	int i;
  
  	for (i = 0; i < info->ctrl->nr_banks; i++, b++) {
  		if (b->bank_num == num)
  			return b;
  	}
  
  	return ERR_PTR(-EINVAL);
  }
  
  /*
   * Pinctrl_ops handling
   */
  
  static int rockchip_get_groups_count(struct pinctrl_dev *pctldev)
  {
  	struct rockchip_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
  
  	return info->ngroups;
  }
  
  static const char *rockchip_get_group_name(struct pinctrl_dev *pctldev,
  							unsigned selector)
  {
  	struct rockchip_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
  
  	return info->groups[selector].name;
  }
  
  static int rockchip_get_group_pins(struct pinctrl_dev *pctldev,
  				      unsigned selector, const unsigned **pins,
  				      unsigned *npins)
  {
  	struct rockchip_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
  
  	if (selector >= info->ngroups)
  		return -EINVAL;
  
  	*pins = info->groups[selector].pins;
  	*npins = info->groups[selector].npins;
  
  	return 0;
  }
  
  static int rockchip_dt_node_to_map(struct pinctrl_dev *pctldev,
  				 struct device_node *np,
  				 struct pinctrl_map **map, unsigned *num_maps)
  {
  	struct rockchip_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
  	const struct rockchip_pin_group *grp;
  	struct pinctrl_map *new_map;
  	struct device_node *parent;
  	int map_num = 1;
  	int i;
  
  	/*
  	 * first find the group of this node and check if we need to create
  	 * config maps for pins
  	 */
  	grp = pinctrl_name_to_group(info, np->name);
  	if (!grp) {
  		dev_err(info->dev, "unable to find group for node %s
  ",
  			np->name);
  		return -EINVAL;
  	}
  
  	map_num += grp->npins;
  	new_map = devm_kzalloc(pctldev->dev, sizeof(*new_map) * map_num,
  								GFP_KERNEL);
  	if (!new_map)
  		return -ENOMEM;
  
  	*map = new_map;
  	*num_maps = map_num;
  
  	/* create mux map */
  	parent = of_get_parent(np);
  	if (!parent) {
  		devm_kfree(pctldev->dev, new_map);
  		return -EINVAL;
  	}
  	new_map[0].type = PIN_MAP_TYPE_MUX_GROUP;
  	new_map[0].data.mux.function = parent->name;
  	new_map[0].data.mux.group = np->name;
  	of_node_put(parent);
  
  	/* create config map */
  	new_map++;
  	for (i = 0; i < grp->npins; i++) {
  		new_map[i].type = PIN_MAP_TYPE_CONFIGS_PIN;
  		new_map[i].data.configs.group_or_pin =
  				pin_get_name(pctldev, grp->pins[i]);
  		new_map[i].data.configs.configs = grp->data[i].configs;
  		new_map[i].data.configs.num_configs = grp->data[i].nconfigs;
  	}
  
  	dev_dbg(pctldev->dev, "maps: function %s group %s num %d
  ",
  		(*map)->data.mux.function, (*map)->data.mux.group, map_num);
  
  	return 0;
  }
  
  static void rockchip_dt_free_map(struct pinctrl_dev *pctldev,
  				    struct pinctrl_map *map, unsigned num_maps)
  {
  }
  
  static const struct pinctrl_ops rockchip_pctrl_ops = {
  	.get_groups_count	= rockchip_get_groups_count,
  	.get_group_name		= rockchip_get_group_name,
  	.get_group_pins		= rockchip_get_group_pins,
  	.dt_node_to_map		= rockchip_dt_node_to_map,
  	.dt_free_map		= rockchip_dt_free_map,
  };
  
  /*
   * Hardware access
   */
  
  /*
   * Set a new mux function for a pin.
   *
   * The register is divided into the upper and lower 16 bit. When changing
   * a value, the previous register value is not read and changed. Instead
   * it seems the changed bits are marked in the upper 16 bit, while the
   * changed value gets set in the same offset in the lower 16 bit.
   * All pin settings seem to be 2 bit wide in both the upper and lower
   * parts.
   * @bank: pin bank to change
   * @pin: pin to change
   * @mux: new mux function to set
   */
  static void rockchip_set_mux(struct rockchip_pin_bank *bank, int pin, int mux)
  {
  	struct rockchip_pinctrl *info = bank->drvdata;
  	void __iomem *reg = info->reg_base + info->ctrl->mux_offset;
  	unsigned long flags;
  	u8 bit;
  	u32 data;
  
  	dev_dbg(info->dev, "setting mux of GPIO%d-%d to %d
  ",
  						bank->bank_num, pin, mux);
  
  	/* get basic quadrupel of mux registers and the correct reg inside */
  	reg += bank->bank_num * 0x10;
  	reg += (pin / 8) * 4;
  	bit = (pin % 8) * 2;
  
  	spin_lock_irqsave(&bank->slock, flags);
  
  	data = (3 << (bit + 16));
  	data |= (mux & 3) << bit;
  	writel(data, reg);
  
  	spin_unlock_irqrestore(&bank->slock, flags);
  }
  
  #define RK2928_PULL_OFFSET		0x118
  #define RK2928_PULL_PINS_PER_REG	16
  #define RK2928_PULL_BANK_STRIDE		8
  
  static void rk2928_calc_pull_reg_and_bit(struct rockchip_pin_bank *bank,
  				    int pin_num, void __iomem **reg, u8 *bit)
  {
  	struct rockchip_pinctrl *info = bank->drvdata;
  
  	*reg = info->reg_base + RK2928_PULL_OFFSET;
  	*reg += bank->bank_num * RK2928_PULL_BANK_STRIDE;
  	*reg += (pin_num / RK2928_PULL_PINS_PER_REG) * 4;
  
  	*bit = pin_num % RK2928_PULL_PINS_PER_REG;
  };
  
  #define RK3188_PULL_BITS_PER_PIN	2
  #define RK3188_PULL_PINS_PER_REG	8
  #define RK3188_PULL_BANK_STRIDE		16
  
  static void rk3188_calc_pull_reg_and_bit(struct rockchip_pin_bank *bank,
  				    int pin_num, void __iomem **reg, u8 *bit)
  {
  	struct rockchip_pinctrl *info = bank->drvdata;
  
  	/* The first 12 pins of the first bank are located elsewhere */
  	if (bank->bank_type == RK3188_BANK0 && pin_num < 12) {
  		*reg = bank->reg_pull +
  				((pin_num / RK3188_PULL_PINS_PER_REG) * 4);
  		*bit = pin_num % RK3188_PULL_PINS_PER_REG;
  		*bit *= RK3188_PULL_BITS_PER_PIN;
  	} else {
  		*reg = info->reg_pull - 4;
  		*reg += bank->bank_num * RK3188_PULL_BANK_STRIDE;
  		*reg += ((pin_num / RK3188_PULL_PINS_PER_REG) * 4);
  
  		/*
  		 * The bits in these registers have an inverse ordering
  		 * with the lowest pin being in bits 15:14 and the highest
  		 * pin in bits 1:0
  		 */
  		*bit = 7 - (pin_num % RK3188_PULL_PINS_PER_REG);
  		*bit *= RK3188_PULL_BITS_PER_PIN;
  	}
  }
  
  static int rockchip_get_pull(struct rockchip_pin_bank *bank, int pin_num)
  {
  	struct rockchip_pinctrl *info = bank->drvdata;
  	struct rockchip_pin_ctrl *ctrl = info->ctrl;
  	void __iomem *reg;
  	u8 bit;
  	u32 data;
  
  	/* rk3066b does support any pulls */
  	if (ctrl->type == RK3066B)
  		return PIN_CONFIG_BIAS_DISABLE;
  
  	ctrl->pull_calc_reg(bank, pin_num, &reg, &bit);
  
  	switch (ctrl->type) {
  	case RK2928:
  		return !(readl_relaxed(reg) & BIT(bit))
  				? PIN_CONFIG_BIAS_PULL_PIN_DEFAULT
  				: PIN_CONFIG_BIAS_DISABLE;
  	case RK3188:
  		data = readl_relaxed(reg) >> bit;
  		data &= (1 << RK3188_PULL_BITS_PER_PIN) - 1;
  
  		switch (data) {
  		case 0:
  			return PIN_CONFIG_BIAS_DISABLE;
  		case 1:
  			return PIN_CONFIG_BIAS_PULL_UP;
  		case 2:
  			return PIN_CONFIG_BIAS_PULL_DOWN;
  		case 3:
  			return PIN_CONFIG_BIAS_BUS_HOLD;
  		}
  
  		dev_err(info->dev, "unknown pull setting
  ");
  		return -EIO;
  	default:
  		dev_err(info->dev, "unsupported pinctrl type
  ");
  		return -EINVAL;
  	};
  }
  
  static int rockchip_set_pull(struct rockchip_pin_bank *bank,
  					int pin_num, int pull)
  {
  	struct rockchip_pinctrl *info = bank->drvdata;
  	struct rockchip_pin_ctrl *ctrl = info->ctrl;
  	void __iomem *reg;
  	unsigned long flags;
  	u8 bit;
  	u32 data;
  
  	dev_dbg(info->dev, "setting pull of GPIO%d-%d to %d
  ",
  		 bank->bank_num, pin_num, pull);
  
  	/* rk3066b does support any pulls */
  	if (ctrl->type == RK3066B)
  		return pull ? -EINVAL : 0;
  
  	ctrl->pull_calc_reg(bank, pin_num, &reg, &bit);
  
  	switch (ctrl->type) {
  	case RK2928:
  		spin_lock_irqsave(&bank->slock, flags);
  
  		data = BIT(bit + 16);
  		if (pull == PIN_CONFIG_BIAS_DISABLE)
  			data |= BIT(bit);
  		writel(data, reg);
  
  		spin_unlock_irqrestore(&bank->slock, flags);
  		break;
  	case RK3188:
  		spin_lock_irqsave(&bank->slock, flags);
  
  		/* enable the write to the equivalent lower bits */
  		data = ((1 << RK3188_PULL_BITS_PER_PIN) - 1) << (bit + 16);
  
  		switch (pull) {
  		case PIN_CONFIG_BIAS_DISABLE:
  			break;
  		case PIN_CONFIG_BIAS_PULL_UP:
  			data |= (1 << bit);
  			break;
  		case PIN_CONFIG_BIAS_PULL_DOWN:
  			data |= (2 << bit);
  			break;
  		case PIN_CONFIG_BIAS_BUS_HOLD:
  			data |= (3 << bit);
  			break;
  		default:
  			spin_unlock_irqrestore(&bank->slock, flags);
  			dev_err(info->dev, "unsupported pull setting %d
  ",
  				pull);
  			return -EINVAL;
  		}
  
  		writel(data, reg);
  
  		spin_unlock_irqrestore(&bank->slock, flags);
  		break;
  	default:
  		dev_err(info->dev, "unsupported pinctrl type
  ");
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  /*
   * Pinmux_ops handling
   */
  
  static int rockchip_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
  {
  	struct rockchip_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
  
  	return info->nfunctions;
  }
  
  static const char *rockchip_pmx_get_func_name(struct pinctrl_dev *pctldev,
  					  unsigned selector)
  {
  	struct rockchip_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
  
  	return info->functions[selector].name;
  }
  
  static int rockchip_pmx_get_groups(struct pinctrl_dev *pctldev,
  				unsigned selector, const char * const **groups,
  				unsigned * const num_groups)
  {
  	struct rockchip_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
  
  	*groups = info->functions[selector].groups;
  	*num_groups = info->functions[selector].ngroups;
  
  	return 0;
  }
  
  static int rockchip_pmx_enable(struct pinctrl_dev *pctldev, unsigned selector,
  							    unsigned group)
  {
  	struct rockchip_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
  	const unsigned int *pins = info->groups[group].pins;
  	const struct rockchip_pin_config *data = info->groups[group].data;
  	struct rockchip_pin_bank *bank;
  	int cnt;
  
  	dev_dbg(info->dev, "enable function %s group %s
  ",
  		info->functions[selector].name, info->groups[group].name);
  
  	/*
  	 * for each pin in the pin group selected, program the correspoding pin
  	 * pin function number in the config register.
  	 */
  	for (cnt = 0; cnt < info->groups[group].npins; cnt++) {
  		bank = pin_to_bank(info, pins[cnt]);
  		rockchip_set_mux(bank, pins[cnt] - bank->pin_base,
  				 data[cnt].func);
  	}
  
  	return 0;
  }
  
  static void rockchip_pmx_disable(struct pinctrl_dev *pctldev,
  					unsigned selector, unsigned group)
  {
  	struct rockchip_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
  	const unsigned int *pins = info->groups[group].pins;
  	struct rockchip_pin_bank *bank;
  	int cnt;
  
  	dev_dbg(info->dev, "disable function %s group %s
  ",
  		info->functions[selector].name, info->groups[group].name);
  
  	for (cnt = 0; cnt < info->groups[group].npins; cnt++) {
  		bank = pin_to_bank(info, pins[cnt]);
  		rockchip_set_mux(bank, pins[cnt] - bank->pin_base, 0);
  	}
  }
  
  /*
   * The calls to gpio_direction_output() and gpio_direction_input()
   * leads to this function call (via the pinctrl_gpio_direction_{input|output}()
   * function called from the gpiolib interface).
   */
  static int rockchip_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
  					      struct pinctrl_gpio_range *range,
  					      unsigned offset, bool input)
  {
  	struct rockchip_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
  	struct rockchip_pin_bank *bank;
  	struct gpio_chip *chip;
  	int pin;
  	u32 data;
  
  	chip = range->gc;
  	bank = gc_to_pin_bank(chip);
  	pin = offset - chip->base;
  
  	dev_dbg(info->dev, "gpio_direction for pin %u as %s-%d to %s
  ",
  		 offset, range->name, pin, input ? "input" : "output");
  
  	rockchip_set_mux(bank, pin, RK_FUNC_GPIO);
  
  	data = readl_relaxed(bank->reg_base + GPIO_SWPORT_DDR);
  	/* set bit to 1 for output, 0 for input */
  	if (!input)
  		data |= BIT(pin);
  	else
  		data &= ~BIT(pin);
  	writel_relaxed(data, bank->reg_base + GPIO_SWPORT_DDR);
  
  	return 0;
  }
  
  static const struct pinmux_ops rockchip_pmx_ops = {
  	.get_functions_count	= rockchip_pmx_get_funcs_count,
  	.get_function_name	= rockchip_pmx_get_func_name,
  	.get_function_groups	= rockchip_pmx_get_groups,
  	.enable			= rockchip_pmx_enable,
  	.disable		= rockchip_pmx_disable,
  	.gpio_set_direction	= rockchip_pmx_gpio_set_direction,
  };
  
  /*
   * Pinconf_ops handling
   */
  
  static bool rockchip_pinconf_pull_valid(struct rockchip_pin_ctrl *ctrl,
  					enum pin_config_param pull)
  {
  	switch (ctrl->type) {
  	case RK2928:
  		return (pull == PIN_CONFIG_BIAS_PULL_PIN_DEFAULT ||
  					pull == PIN_CONFIG_BIAS_DISABLE);
  	case RK3066B:
  		return pull ? false : true;
  	case RK3188:
  		return (pull != PIN_CONFIG_BIAS_PULL_PIN_DEFAULT);
  	}
  
  	return false;
  }
  
  /* set the pin config settings for a specified pin */
  static int rockchip_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
  				unsigned long *configs, unsigned num_configs)
  {
  	struct rockchip_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
  	struct rockchip_pin_bank *bank = pin_to_bank(info, pin);
  	enum pin_config_param param;
  	u16 arg;
  	int i;
  	int rc;
  
  	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:
  			rc =  rockchip_set_pull(bank, pin - bank->pin_base,
  				param);
  			if (rc)
  				return rc;
  			break;
  		case PIN_CONFIG_BIAS_PULL_UP:
  		case PIN_CONFIG_BIAS_PULL_DOWN:
  		case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
  		case PIN_CONFIG_BIAS_BUS_HOLD:
  			if (!rockchip_pinconf_pull_valid(info->ctrl, param))
  				return -ENOTSUPP;
  
  			if (!arg)
  				return -EINVAL;
  
  			rc = rockchip_set_pull(bank, pin - bank->pin_base,
  				param);
  			if (rc)
  				return rc;
  			break;
  		default:
  			return -ENOTSUPP;
  			break;
  		}
  	} /* for each config */
  
  	return 0;
  }
  
  /* get the pin config settings for a specified pin */
  static int rockchip_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
  							unsigned long *config)
  {
  	struct rockchip_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
  	struct rockchip_pin_bank *bank = pin_to_bank(info, pin);
  	enum pin_config_param param = pinconf_to_config_param(*config);
  
  	switch (param) {
  	case PIN_CONFIG_BIAS_DISABLE:
  		if (rockchip_get_pull(bank, pin - bank->pin_base) != param)
  			return -EINVAL;
  
  		*config = 0;
  		break;
  	case PIN_CONFIG_BIAS_PULL_UP:
  	case PIN_CONFIG_BIAS_PULL_DOWN:
  	case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
  	case PIN_CONFIG_BIAS_BUS_HOLD:
  		if (!rockchip_pinconf_pull_valid(info->ctrl, param))
  			return -ENOTSUPP;
  
  		if (rockchip_get_pull(bank, pin - bank->pin_base) != param)
  			return -EINVAL;
  
  		*config = 1;
  		break;
  	default:
  		return -ENOTSUPP;
  		break;
  	}
  
  	return 0;
  }
  
  static const struct pinconf_ops rockchip_pinconf_ops = {
  	.pin_config_get			= rockchip_pinconf_get,
  	.pin_config_set			= rockchip_pinconf_set,
  };
  
  static const struct of_device_id rockchip_bank_match[] = {
  	{ .compatible = "rockchip,gpio-bank" },
  	{ .compatible = "rockchip,rk3188-gpio-bank0" },
  	{},
  };
  
  static void rockchip_pinctrl_child_count(struct rockchip_pinctrl *info,
  						struct device_node *np)
  {
  	struct device_node *child;
  
  	for_each_child_of_node(np, child) {
  		if (of_match_node(rockchip_bank_match, child))
  			continue;
  
  		info->nfunctions++;
  		info->ngroups += of_get_child_count(child);
  	}
  }
  
  static int rockchip_pinctrl_parse_groups(struct device_node *np,
  					      struct rockchip_pin_group *grp,
  					      struct rockchip_pinctrl *info,
  					      u32 index)
  {
  	struct rockchip_pin_bank *bank;
  	int size;
  	const __be32 *list;
  	int num;
  	int i, j;
  	int ret;
  
  	dev_dbg(info->dev, "group(%d): %s
  ", index, np->name);
  
  	/* Initialise group */
  	grp->name = np->name;
  
  	/*
  	 * the binding format is rockchip,pins = <bank pin mux CONFIG>,
  	 * do sanity check and calculate pins number
  	 */
  	list = of_get_property(np, "rockchip,pins", &size);
  	/* we do not check return since it's safe node passed down */
  	size /= sizeof(*list);
  	if (!size || size % 4) {
  		dev_err(info->dev, "wrong pins number or pins and configs should be by 4
  ");
  		return -EINVAL;
  	}
  
  	grp->npins = size / 4;
  
  	grp->pins = devm_kzalloc(info->dev, grp->npins * sizeof(unsigned int),
  						GFP_KERNEL);
  	grp->data = devm_kzalloc(info->dev, grp->npins *
  					  sizeof(struct rockchip_pin_config),
  					GFP_KERNEL);
  	if (!grp->pins || !grp->data)
  		return -ENOMEM;
  
  	for (i = 0, j = 0; i < size; i += 4, j++) {
  		const __be32 *phandle;
  		struct device_node *np_config;
  
  		num = be32_to_cpu(*list++);
  		bank = bank_num_to_bank(info, num);
  		if (IS_ERR(bank))
  			return PTR_ERR(bank);
  
  		grp->pins[j] = bank->pin_base + be32_to_cpu(*list++);
  		grp->data[j].func = be32_to_cpu(*list++);
  
  		phandle = list++;
  		if (!phandle)
  			return -EINVAL;
  
  		np_config = of_find_node_by_phandle(be32_to_cpup(phandle));
  		ret = pinconf_generic_parse_dt_config(np_config,
  				&grp->data[j].configs, &grp->data[j].nconfigs);
  		if (ret)
  			return ret;
  	}
  
  	return 0;
  }
  
  static int rockchip_pinctrl_parse_functions(struct device_node *np,
  						struct rockchip_pinctrl *info,
  						u32 index)
  {
  	struct device_node *child;
  	struct rockchip_pmx_func *func;
  	struct rockchip_pin_group *grp;
  	int ret;
  	static u32 grp_index;
  	u32 i = 0;
  
  	dev_dbg(info->dev, "parse function(%d): %s
  ", index, np->name);
  
  	func = &info->functions[index];
  
  	/* Initialise function */
  	func->name = np->name;
  	func->ngroups = of_get_child_count(np);
  	if (func->ngroups <= 0)
  		return 0;
  
  	func->groups = devm_kzalloc(info->dev,
  			func->ngroups * sizeof(char *), GFP_KERNEL);
  	if (!func->groups)
  		return -ENOMEM;
  
  	for_each_child_of_node(np, child) {
  		func->groups[i] = child->name;
  		grp = &info->groups[grp_index++];
  		ret = rockchip_pinctrl_parse_groups(child, grp, info, i++);
  		if (ret)
  			return ret;
  	}
  
  	return 0;
  }
  
  static int rockchip_pinctrl_parse_dt(struct platform_device *pdev,
  					      struct rockchip_pinctrl *info)
  {
  	struct device *dev = &pdev->dev;
  	struct device_node *np = dev->of_node;
  	struct device_node *child;
  	int ret;
  	int i;
  
  	rockchip_pinctrl_child_count(info, np);
  
  	dev_dbg(&pdev->dev, "nfunctions = %d
  ", info->nfunctions);
  	dev_dbg(&pdev->dev, "ngroups = %d
  ", info->ngroups);
  
  	info->functions = devm_kzalloc(dev, info->nfunctions *
  					      sizeof(struct rockchip_pmx_func),
  					      GFP_KERNEL);
  	if (!info->functions) {
  		dev_err(dev, "failed to allocate memory for function list
  ");
  		return -EINVAL;
  	}
  
  	info->groups = devm_kzalloc(dev, info->ngroups *
  					    sizeof(struct rockchip_pin_group),
  					    GFP_KERNEL);
  	if (!info->groups) {
  		dev_err(dev, "failed allocate memory for ping group list
  ");
  		return -EINVAL;
  	}
  
  	i = 0;
  
  	for_each_child_of_node(np, child) {
  		if (of_match_node(rockchip_bank_match, child))
  			continue;
  
  		ret = rockchip_pinctrl_parse_functions(child, info, i++);
  		if (ret) {
  			dev_err(&pdev->dev, "failed to parse function
  ");
  			return ret;
  		}
  	}
  
  	return 0;
  }
  
  static int rockchip_pinctrl_register(struct platform_device *pdev,
  					struct rockchip_pinctrl *info)
  {
  	struct pinctrl_desc *ctrldesc = &info->pctl;
  	struct pinctrl_pin_desc *pindesc, *pdesc;
  	struct rockchip_pin_bank *pin_bank;
  	int pin, bank, ret;
  	int k;
  
  	ctrldesc->name = "rockchip-pinctrl";
  	ctrldesc->owner = THIS_MODULE;
  	ctrldesc->pctlops = &rockchip_pctrl_ops;
  	ctrldesc->pmxops = &rockchip_pmx_ops;
  	ctrldesc->confops = &rockchip_pinconf_ops;
  
  	pindesc = devm_kzalloc(&pdev->dev, sizeof(*pindesc) *
  			info->ctrl->nr_pins, GFP_KERNEL);
  	if (!pindesc) {
  		dev_err(&pdev->dev, "mem alloc for pin descriptors failed
  ");
  		return -ENOMEM;
  	}
  	ctrldesc->pins = pindesc;
  	ctrldesc->npins = info->ctrl->nr_pins;
  
  	pdesc = pindesc;
  	for (bank = 0 , k = 0; bank < info->ctrl->nr_banks; bank++) {
  		pin_bank = &info->ctrl->pin_banks[bank];
  		for (pin = 0; pin < pin_bank->nr_pins; pin++, k++) {
  			pdesc->number = k;
  			pdesc->name = kasprintf(GFP_KERNEL, "%s-%d",
  						pin_bank->name, pin);
  			pdesc++;
  		}
  	}
  
  	info->pctl_dev = pinctrl_register(ctrldesc, &pdev->dev, info);
  	if (!info->pctl_dev) {
  		dev_err(&pdev->dev, "could not register pinctrl driver
  ");
  		return -EINVAL;
  	}
  
  	for (bank = 0; bank < info->ctrl->nr_banks; ++bank) {
  		pin_bank = &info->ctrl->pin_banks[bank];
  		pin_bank->grange.name = pin_bank->name;
  		pin_bank->grange.id = bank;
  		pin_bank->grange.pin_base = pin_bank->pin_base;
  		pin_bank->grange.base = pin_bank->gpio_chip.base;
  		pin_bank->grange.npins = pin_bank->gpio_chip.ngpio;
  		pin_bank->grange.gc = &pin_bank->gpio_chip;
  		pinctrl_add_gpio_range(info->pctl_dev, &pin_bank->grange);
  	}
  
  	ret = rockchip_pinctrl_parse_dt(pdev, info);
  	if (ret) {
  		pinctrl_unregister(info->pctl_dev);
  		return ret;
  	}
  
  	return 0;
  }
  
  /*
   * GPIO handling
   */
  
  static int rockchip_gpio_request(struct gpio_chip *chip, unsigned offset)
  {
  	return pinctrl_request_gpio(chip->base + offset);
  }
  
  static void rockchip_gpio_free(struct gpio_chip *chip, unsigned offset)
  {
  	pinctrl_free_gpio(chip->base + offset);
  }
  
  static void rockchip_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
  {
  	struct rockchip_pin_bank *bank = gc_to_pin_bank(gc);
  	void __iomem *reg = bank->reg_base + GPIO_SWPORT_DR;
  	unsigned long flags;
  	u32 data;
  
  	spin_lock_irqsave(&bank->slock, flags);
  
  	data = readl(reg);
  	data &= ~BIT(offset);
  	if (value)
  		data |= BIT(offset);
  	writel(data, reg);
  
  	spin_unlock_irqrestore(&bank->slock, flags);
  }
  
  /*
   * Returns the level of the pin for input direction and setting of the DR
   * register for output gpios.
   */
  static int rockchip_gpio_get(struct gpio_chip *gc, unsigned offset)
  {
  	struct rockchip_pin_bank *bank = gc_to_pin_bank(gc);
  	u32 data;
  
  	data = readl(bank->reg_base + GPIO_EXT_PORT);
  	data >>= offset;
  	data &= 1;
  	return data;
  }
  
  /*
   * gpiolib gpio_direction_input callback function. The setting of the pin
   * mux function as 'gpio input' will be handled by the pinctrl susbsystem
   * interface.
   */
  static int rockchip_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
  {
  	return pinctrl_gpio_direction_input(gc->base + offset);
  }
  
  /*
   * gpiolib gpio_direction_output callback function. The setting of the pin
   * mux function as 'gpio output' will be handled by the pinctrl susbsystem
   * interface.
   */
  static int rockchip_gpio_direction_output(struct gpio_chip *gc,
  					  unsigned offset, int value)
  {
  	rockchip_gpio_set(gc, offset, value);
  	return pinctrl_gpio_direction_output(gc->base + offset);
  }
  
  /*
   * gpiolib gpio_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 offset)
  {
  	struct rockchip_pin_bank *bank = gc_to_pin_bank(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 = rockchip_gpio_request,
  	.free = rockchip_gpio_free,
  	.set = rockchip_gpio_set,
  	.get = rockchip_gpio_get,
  	.direction_input = rockchip_gpio_direction_input,
  	.direction_output = rockchip_gpio_direction_output,
  	.to_irq = rockchip_gpio_to_irq,
  	.owner = THIS_MODULE,
  };
  
  /*
   * Interrupt handling
   */
  
  static void rockchip_irq_demux(unsigned int irq, struct irq_desc *desc)
  {
  	struct irq_chip *chip = irq_get_chip(irq);
  	struct rockchip_pin_bank *bank = irq_get_handler_data(irq);
  	u32 polarity = 0, data = 0;
  	u32 pend;
  	bool edge_changed = false;
  
  	dev_dbg(bank->drvdata->dev, "got irq for bank %s
  ", bank->name);
  
  	chained_irq_enter(chip, desc);
  
  	pend = readl_relaxed(bank->reg_base + GPIO_INT_STATUS);
  
  	if (bank->toggle_edge_mode) {
  		polarity = readl_relaxed(bank->reg_base +
  					 GPIO_INT_POLARITY);
  		data = readl_relaxed(bank->reg_base + GPIO_EXT_PORT);
  	}
  
  	while (pend) {
  		unsigned int virq;
  
  		irq = __ffs(pend);
  		pend &= ~BIT(irq);
  		virq = irq_linear_revmap(bank->domain, irq);
  
  		if (!virq) {
  			dev_err(bank->drvdata->dev, "unmapped irq %d
  ", irq);
  			continue;
  		}
  
  		dev_dbg(bank->drvdata->dev, "handling irq %d
  ", irq);
  
  		/*
  		 * Triggering IRQ on both rising and falling edge
  		 * needs manual intervention.
  		 */
  		if (bank->toggle_edge_mode & BIT(irq)) {
  			if (data & BIT(irq))
  				polarity &= ~BIT(irq);
  			else
  				polarity |= BIT(irq);
  
  			edge_changed = true;
  		}
  
  		generic_handle_irq(virq);
  	}
  
  	if (bank->toggle_edge_mode && edge_changed) {
  		/* Interrupt params should only be set with ints disabled */
  		data = readl_relaxed(bank->reg_base + GPIO_INTEN);
  		writel_relaxed(0, bank->reg_base + GPIO_INTEN);
  		writel(polarity, bank->reg_base + GPIO_INT_POLARITY);
  		writel(data, bank->reg_base + GPIO_INTEN);
  	}
  
  	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;
  
  	/* make sure the pin is configured as gpio input */
  	rockchip_set_mux(bank, d->hwirq, RK_FUNC_GPIO);
  	data = readl_relaxed(bank->reg_base + GPIO_SWPORT_DDR);
  	data &= ~mask;
  	writel_relaxed(data, bank->reg_base + GPIO_SWPORT_DDR);
  
  	if (type & IRQ_TYPE_EDGE_BOTH)
  		__irq_set_handler_locked(d->irq, handle_edge_irq);
  	else
  		__irq_set_handler_locked(d->irq, handle_level_irq);
  
  	irq_gc_lock(gc);
  
  	level = readl_relaxed(gc->reg_base + GPIO_INTTYPE_LEVEL);
  	polarity = readl_relaxed(gc->reg_base + GPIO_INT_POLARITY);
  
  	switch (type) {
  	case IRQ_TYPE_EDGE_BOTH:
  		bank->toggle_edge_mode |= mask;
  		level |= mask;
  
  		/*
  		 * Determine gpio state. If 1 next interrupt should be falling
  		 * otherwise rising.
  		 */
  		data = readl(bank->reg_base + GPIO_EXT_PORT);
  		if (data & mask)
  			polarity &= ~mask;
  		else
  			polarity |= mask;
  		break;
  	case IRQ_TYPE_EDGE_RISING:
  		bank->toggle_edge_mode &= ~mask;
  		level |= mask;
  		polarity |= mask;
  		break;
  	case IRQ_TYPE_EDGE_FALLING:
  		bank->toggle_edge_mode &= ~mask;
  		level |= mask;
  		polarity &= ~mask;
  		break;
  	case IRQ_TYPE_LEVEL_HIGH:
  		bank->toggle_edge_mode &= ~mask;
  		level &= ~mask;
  		polarity |= mask;
  		break;
  	case IRQ_TYPE_LEVEL_LOW:
  		bank->toggle_edge_mode &= ~mask;
  		level &= ~mask;
  		polarity &= ~mask;
  		break;
  	default:
  		irq_gc_unlock(gc);
  		return -EINVAL;
  	}
  
  	writel_relaxed(level, gc->reg_base + GPIO_INTTYPE_LEVEL);
  	writel_relaxed(polarity, gc->reg_base + GPIO_INT_POLARITY);
  
  	irq_gc_unlock(gc);
  
  	return 0;
  }
  
  static int rockchip_interrupts_register(struct platform_device *pdev,
  						struct rockchip_pinctrl *info)
  {
  	struct rockchip_pin_ctrl *ctrl = info->ctrl;
  	struct rockchip_pin_bank *bank = ctrl->pin_banks;
  	unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
  	struct irq_chip_generic *gc;
  	int ret;
  	int i;
  
  	for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
  		if (!bank->valid) {
  			dev_warn(&pdev->dev, "bank %s is not valid
  ",
  				 bank->name);
  			continue;
  		}
  
  		bank->domain = irq_domain_add_linear(bank->of_node, 32,
  						&irq_generic_chip_ops, NULL);
  		if (!bank->domain) {
  			dev_warn(&pdev->dev, "could not initialize irq domain for bank %s
  ",
  				 bank->name);
  			continue;
  		}
  
  		ret = irq_alloc_domain_generic_chips(bank->domain, 32, 1,
  					 "rockchip_gpio_irq", handle_level_irq,
  					 clr, 0, IRQ_GC_INIT_MASK_CACHE);
  		if (ret) {
  			dev_err(&pdev->dev, "could not alloc generic chips for bank %s
  ",
  				bank->name);
  			irq_domain_remove(bank->domain);
  			continue;
  		}
  
  		gc = irq_get_domain_generic_chip(bank->domain, 0);
  		gc->reg_base = bank->reg_base;
  		gc->private = bank;
  		gc->chip_types[0].regs.mask = GPIO_INTEN;
  		gc->chip_types[0].regs.ack = GPIO_PORTS_EOI;
  		gc->chip_types[0].chip.irq_ack = irq_gc_ack_set_bit;
  		gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit;
  		gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit;
  		gc->chip_types[0].chip.irq_set_wake = irq_gc_set_wake;
  		gc->chip_types[0].chip.irq_set_type = rockchip_irq_set_type;
  
  		irq_set_handler_data(bank->irq, bank);
  		irq_set_chained_handler(bank->irq, rockchip_irq_demux);
  	}
  
  	return 0;
  }
  
  static int rockchip_gpiolib_register(struct platform_device *pdev,
  						struct rockchip_pinctrl *info)
  {
  	struct rockchip_pin_ctrl *ctrl = info->ctrl;
  	struct rockchip_pin_bank *bank = ctrl->pin_banks;
  	struct gpio_chip *gc;
  	int ret;
  	int i;
  
  	for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
  		if (!bank->valid) {
  			dev_warn(&pdev->dev, "bank %s is not valid
  ",
  				 bank->name);
  			continue;
  		}
  
  		bank->gpio_chip = rockchip_gpiolib_chip;
  
  		gc = &bank->gpio_chip;
  		gc->base = bank->pin_base;
  		gc->ngpio = bank->nr_pins;
  		gc->dev = &pdev->dev;
  		gc->of_node = bank->of_node;
  		gc->label = bank->name;
  
  		ret = gpiochip_add(gc);
  		if (ret) {
  			dev_err(&pdev->dev, "failed to register gpio_chip %s, error code: %d
  ",
  							gc->label, ret);
  			goto fail;
  		}
  	}
  
  	rockchip_interrupts_register(pdev, info);
  
  	return 0;
  
  fail:
  	for (--i, --bank; i >= 0; --i, --bank) {
  		if (!bank->valid)
  			continue;
  
  		if (gpiochip_remove(&bank->gpio_chip))
  			dev_err(&pdev->dev, "gpio chip %s remove failed
  ",
  							bank->gpio_chip.label);
  	}
  	return ret;
  }
  
  static int rockchip_gpiolib_unregister(struct platform_device *pdev,
  						struct rockchip_pinctrl *info)
  {
  	struct rockchip_pin_ctrl *ctrl = info->ctrl;
  	struct rockchip_pin_bank *bank = ctrl->pin_banks;
  	int ret = 0;
  	int i;
  
  	for (i = 0; !ret && i < ctrl->nr_banks; ++i, ++bank) {
  		if (!bank->valid)
  			continue;
  
  		ret = gpiochip_remove(&bank->gpio_chip);
  	}
  
  	if (ret)
  		dev_err(&pdev->dev, "gpio chip remove failed
  ");
  
  	return ret;
  }
  
  static int rockchip_get_bank_data(struct rockchip_pin_bank *bank,
  				  struct device *dev)
  {
  	struct resource res;
  
  	if (of_address_to_resource(bank->of_node, 0, &res)) {
  		dev_err(dev, "cannot find IO resource for bank
  ");
  		return -ENOENT;
  	}
  
  	bank->reg_base = devm_ioremap_resource(dev, &res);
  	if (IS_ERR(bank->reg_base))
  		return PTR_ERR(bank->reg_base);
  
  	/*
  	 * special case, where parts of the pull setting-registers are
  	 * part of the PMU register space
  	 */
  	if (of_device_is_compatible(bank->of_node,
  				    "rockchip,rk3188-gpio-bank0")) {
  		bank->bank_type = RK3188_BANK0;
  
  		if (of_address_to_resource(bank->of_node, 1, &res)) {
  			dev_err(dev, "cannot find IO resource for bank
  ");
  			return -ENOENT;
  		}
  
  		bank->reg_pull = devm_ioremap_resource(dev, &res);
  		if (IS_ERR(bank->reg_pull))
  			return PTR_ERR(bank->reg_pull);
  	} else {
  		bank->bank_type = COMMON_BANK;
  	}
  
  	bank->irq = irq_of_parse_and_map(bank->of_node, 0);
  
  	bank->clk = of_clk_get(bank->of_node, 0);
  	if (IS_ERR(bank->clk))
  		return PTR_ERR(bank->clk);
  
  	return clk_prepare_enable(bank->clk);
  }
  
  static const struct of_device_id rockchip_pinctrl_dt_match[];
  
  /* retrieve the soc specific data */
  static struct rockchip_pin_ctrl *rockchip_pinctrl_get_soc_data(
  						struct rockchip_pinctrl *d,
  						struct platform_device *pdev)
  {
  	const struct of_device_id *match;
  	struct device_node *node = pdev->dev.of_node;
  	struct device_node *np;
  	struct rockchip_pin_ctrl *ctrl;
  	struct rockchip_pin_bank *bank;
  	int i;
  
  	match = of_match_node(rockchip_pinctrl_dt_match, node);
  	ctrl = (struct rockchip_pin_ctrl *)match->data;
  
  	for_each_child_of_node(node, np) {
  		if (!of_find_property(np, "gpio-controller", NULL))
  			continue;
  
  		bank = ctrl->pin_banks;
  		for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
  			if (!strcmp(bank->name, np->name)) {
  				bank->of_node = np;
  
  				if (!rockchip_get_bank_data(bank, &pdev->dev))
  					bank->valid = true;
  
  				break;
  			}
  		}
  	}
  
  	bank = ctrl->pin_banks;
  	for (i = 0; i < ctrl->nr_banks; ++i, ++bank) {
  		spin_lock_init(&bank->slock);
  		bank->drvdata = d;
  		bank->pin_base = ctrl->nr_pins;
  		ctrl->nr_pins += bank->nr_pins;
  	}
  
  	return ctrl;
  }
  
  static int rockchip_pinctrl_probe(struct platform_device *pdev)
  {
  	struct rockchip_pinctrl *info;
  	struct device *dev = &pdev->dev;
  	struct rockchip_pin_ctrl *ctrl;
  	struct resource *res;
  	int ret;
  
  	if (!dev->of_node) {
  		dev_err(dev, "device tree node not found
  ");
  		return -ENODEV;
  	}
  
  	info = devm_kzalloc(dev, sizeof(struct rockchip_pinctrl), GFP_KERNEL);
  	if (!info)
  		return -ENOMEM;
  
  	ctrl = rockchip_pinctrl_get_soc_data(info, pdev);
  	if (!ctrl) {
  		dev_err(dev, "driver data not available
  ");
  		return -EINVAL;
  	}
  	info->ctrl = ctrl;
  	info->dev = dev;
  
  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  	info->reg_base = devm_ioremap_resource(&pdev->dev, res);
  	if (IS_ERR(info->reg_base))
  		return PTR_ERR(info->reg_base);
  
  	/* The RK3188 has its pull registers in a separate place */
  	if (ctrl->type == RK3188) {
  		res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
  		info->reg_pull = devm_ioremap_resource(&pdev->dev, res);
  		if (IS_ERR(info->reg_pull))
  			return PTR_ERR(info->reg_pull);
  	}
  
  	ret = rockchip_gpiolib_register(pdev, info);
  	if (ret)
  		return ret;
  
  	ret = rockchip_pinctrl_register(pdev, info);
  	if (ret) {
  		rockchip_gpiolib_unregister(pdev, info);
  		return ret;
  	}
  
  	platform_set_drvdata(pdev, info);
  
  	return 0;
  }
  
  static struct rockchip_pin_bank rk2928_pin_banks[] = {
  	PIN_BANK(0, 32, "gpio0"),
  	PIN_BANK(1, 32, "gpio1"),
  	PIN_BANK(2, 32, "gpio2"),
  	PIN_BANK(3, 32, "gpio3"),
  };
  
  static struct rockchip_pin_ctrl rk2928_pin_ctrl = {
  		.pin_banks		= rk2928_pin_banks,
  		.nr_banks		= ARRAY_SIZE(rk2928_pin_banks),
  		.label			= "RK2928-GPIO",
  		.type			= RK2928,
  		.mux_offset		= 0xa8,
  		.pull_calc_reg		= rk2928_calc_pull_reg_and_bit,
  };
  
  static struct rockchip_pin_bank rk3066a_pin_banks[] = {
  	PIN_BANK(0, 32, "gpio0"),
  	PIN_BANK(1, 32, "gpio1"),
  	PIN_BANK(2, 32, "gpio2"),
  	PIN_BANK(3, 32, "gpio3"),
  	PIN_BANK(4, 32, "gpio4"),
  	PIN_BANK(6, 16, "gpio6"),
  };
  
  static struct rockchip_pin_ctrl rk3066a_pin_ctrl = {
  		.pin_banks		= rk3066a_pin_banks,
  		.nr_banks		= ARRAY_SIZE(rk3066a_pin_banks),
  		.label			= "RK3066a-GPIO",
  		.type			= RK2928,
  		.mux_offset		= 0xa8,
  		.pull_calc_reg		= rk2928_calc_pull_reg_and_bit,
  };
  
  static struct rockchip_pin_bank rk3066b_pin_banks[] = {
  	PIN_BANK(0, 32, "gpio0"),
  	PIN_BANK(1, 32, "gpio1"),
  	PIN_BANK(2, 32, "gpio2"),
  	PIN_BANK(3, 32, "gpio3"),
  };
  
  static struct rockchip_pin_ctrl rk3066b_pin_ctrl = {
  		.pin_banks	= rk3066b_pin_banks,
  		.nr_banks	= ARRAY_SIZE(rk3066b_pin_banks),
  		.label		= "RK3066b-GPIO",
  		.type		= RK3066B,
  		.mux_offset	= 0x60,
  };
  
  static struct rockchip_pin_bank rk3188_pin_banks[] = {
  	PIN_BANK(0, 32, "gpio0"),
  	PIN_BANK(1, 32, "gpio1"),
  	PIN_BANK(2, 32, "gpio2"),
  	PIN_BANK(3, 32, "gpio3"),
  };
  
  static struct rockchip_pin_ctrl rk3188_pin_ctrl = {
  		.pin_banks		= rk3188_pin_banks,
  		.nr_banks		= ARRAY_SIZE(rk3188_pin_banks),
  		.label			= "RK3188-GPIO",
  		.type			= RK3188,
  		.mux_offset		= 0x68,
  		.pull_calc_reg		= rk3188_calc_pull_reg_and_bit,
  };
  
  static const struct of_device_id rockchip_pinctrl_dt_match[] = {
  	{ .compatible = "rockchip,rk2928-pinctrl",
  		.data = (void *)&rk2928_pin_ctrl },
  	{ .compatible = "rockchip,rk3066a-pinctrl",
  		.data = (void *)&rk3066a_pin_ctrl },
  	{ .compatible = "rockchip,rk3066b-pinctrl",
  		.data = (void *)&rk3066b_pin_ctrl },
  	{ .compatible = "rockchip,rk3188-pinctrl",
  		.data = (void *)&rk3188_pin_ctrl },
  	{},
  };
  MODULE_DEVICE_TABLE(of, rockchip_pinctrl_dt_match);
  
  static struct platform_driver rockchip_pinctrl_driver = {
  	.probe		= rockchip_pinctrl_probe,
  	.driver = {
  		.name	= "rockchip-pinctrl",
  		.owner	= THIS_MODULE,
  		.of_match_table = rockchip_pinctrl_dt_match,
  	},
  };
  
  static int __init rockchip_pinctrl_drv_register(void)
  {
  	return platform_driver_register(&rockchip_pinctrl_driver);
  }
  postcore_initcall(rockchip_pinctrl_drv_register);
  
  MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");
  MODULE_DESCRIPTION("Rockchip pinctrl driver");
  MODULE_LICENSE("GPL v2");