/*
 * Core driver for the imx pin controller
 *
 * Copyright (C) 2012 Freescale Semiconductor, Inc.
 * Copyright (C) 2012 Linaro Ltd.
 *
 * Author: Dong Aisheng <dong.aisheng@linaro.org>
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/slab.h>
#include <linux/regmap.h>

#include "../core.h"
#include "pinctrl-imx.h"

/* The bits in CONFIG cell defined in binding doc*/
#define IMX_NO_PAD_CTL  0x80000000      /* no pin config need */
#define IMX_PAD_SION 0x40000000         /* set SION */

/**
 * @dev: a pointer back to containing device
 * @base: the offset to the controller in virtual memory
 */
struct imx_pinctrl {
        struct device *dev;
        struct pinctrl_dev *pctl;
        void __iomem *base;
        void __iomem *input_sel_base;
        const struct imx_pinctrl_soc_info *info;
};

static const inline struct imx_pin_group *imx_pinctrl_find_group_by_name(
                                const struct imx_pinctrl_soc_info *info,
                                const char *name)
{
        const struct imx_pin_group *grp = NULL;
        int i;

        for (i = 0; i < info->ngroups; i++) {
                if (!strcmp(info->groups[i].name, name)) {
                        grp = &info->groups[i];
                        break;
                }
        }

        return grp;
}

static int imx_get_groups_count(struct pinctrl_dev *pctldev)
{
        struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
        const struct imx_pinctrl_soc_info *info = ipctl->info;

        return info->ngroups;
}

static const char *imx_get_group_name(struct pinctrl_dev *pctldev,
                                       unsigned selector)
{
        struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
        const struct imx_pinctrl_soc_info *info = ipctl->info;

        return info->groups[selector].name;
}

static int imx_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector,
                               const unsigned **pins,
                               unsigned *npins)
{
        struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
        const struct imx_pinctrl_soc_info *info = ipctl->info;

        if (selector >= info->ngroups)
                return -EINVAL;

        *pins = info->groups[selector].pin_ids;
        *npins = info->groups[selector].npins;

        return 0;
}

static void imx_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
                   unsigned offset)
{
        seq_printf(s, "%s", dev_name(pctldev->dev));
}

static int imx_dt_node_to_map(struct pinctrl_dev *pctldev,
                        struct device_node *np,
                        struct pinctrl_map **map, unsigned *num_maps)
{
        struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
        const struct imx_pinctrl_soc_info *info = ipctl->info;
        const struct imx_pin_group *grp;
        struct pinctrl_map *new_map;
        struct device_node *parent;
        int map_num = 1;
        int i, j;

        /*
         * first find the group of this node and check if we need create
         * config maps for pins
         */
        grp = imx_pinctrl_find_group_by_name(info, np->name);
        if (!grp) {
                dev_err(info->dev, "unable to find group for node %s\n",
                        np->name);
                return -EINVAL;
        }

        for (i = 0; i < grp->npins; i++) {
                if (!(grp->pins[i].config & IMX_NO_PAD_CTL))
                        map_num++;
        }

        new_map = kmalloc(sizeof(struct pinctrl_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) {
                kfree(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 = j = 0; i < grp->npins; i++) {
                if (!(grp->pins[i].config & IMX_NO_PAD_CTL)) {
                        new_map[j].type = PIN_MAP_TYPE_CONFIGS_PIN;
                        new_map[j].data.configs.group_or_pin =
                                        pin_get_name(pctldev, grp->pins[i].pin);
                        new_map[j].data.configs.configs = &grp->pins[i].config;
                        new_map[j].data.configs.num_configs = 1;
                        j++;
                }
        }

        dev_dbg(pctldev->dev, "maps: function %s group %s num %d\n",
                (*map)->data.mux.function, (*map)->data.mux.group, map_num);

        return 0;
}

static void imx_dt_free_map(struct pinctrl_dev *pctldev,
                                struct pinctrl_map *map, unsigned num_maps)
{
        kfree(map);
}

static const struct pinctrl_ops imx_pctrl_ops = {
        .get_groups_count = imx_get_groups_count,
        .get_group_name = imx_get_group_name,
        .get_group_pins = imx_get_group_pins,
        .pin_dbg_show = imx_pin_dbg_show,
        .dt_node_to_map = imx_dt_node_to_map,
        .dt_free_map = imx_dt_free_map,

};

static int imx_pmx_set(struct pinctrl_dev *pctldev, unsigned selector,
                       unsigned group)
{
        struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
        const struct imx_pinctrl_soc_info *info = ipctl->info;
        const struct imx_pin_reg *pin_reg;
        unsigned int npins, pin_id;
        int i;
        struct imx_pin_group *grp;

        /*
         * Configure the mux mode for each pin in the group for a specific
         * function.
         */
        grp = &info->groups[group];
        npins = grp->npins;

        dev_dbg(ipctl->dev, "enable function %s group %s\n",
                info->functions[selector].name, grp->name);

        for (i = 0; i < npins; i++) {
                struct imx_pin *pin = &grp->pins[i];
                pin_id = pin->pin;
                pin_reg = &info->pin_regs[pin_id];

                if (pin_reg->mux_reg == -1) {
                        dev_err(ipctl->dev, "Pin(%s) does not support mux function\n",
                                info->pins[pin_id].name);
                        return -EINVAL;
                }

                if (info->flags & SHARE_MUX_CONF_REG) {
                        u32 reg;
                        reg = readl(ipctl->base + pin_reg->mux_reg);
                        reg &= ~(0x7 << 20);
                        reg |= (pin->mux_mode << 20);
                        writel(reg, ipctl->base + pin_reg->mux_reg);
                } else {
                        writel(pin->mux_mode, ipctl->base + pin_reg->mux_reg);
                }
                dev_dbg(ipctl->dev, "write: offset 0x%x val 0x%x\n",
                        pin_reg->mux_reg, pin->mux_mode);

                /*
                 * If the select input value begins with 0xff, it's a quirky
                 * select input and the value should be interpreted as below.
                 *     31     23      15      7        0
                 *     | 0xff | shift | width | select |
                 * It's used to work around the problem that the select
                 * input for some pin is not implemented in the select
                 * input register but in some general purpose register.
                 * We encode the select input value, width and shift of
                 * the bit field into input_val cell of pin function ID
                 * in device tree, and then decode them here for setting
                 * up the select input bits in general purpose register.
                 */
                if (pin->input_val >> 24 == 0xff) {
                        u32 val = pin->input_val;
                        u8 select = val & 0xff;
                        u8 width = (val >> 8) & 0xff;
                        u8 shift = (val >> 16) & 0xff;
                        u32 mask = ((1 << width) - 1) << shift;
                        /*
                         * The input_reg[i] here is actually some IOMUXC general
                         * purpose register, not regular select input register.
                         */
                        val = readl(ipctl->base + pin->input_reg);
                        val &= ~mask;
                        val |= select << shift;
                        writel(val, ipctl->base + pin->input_reg);
                } else if (pin->input_reg) {
                        /*
                         * Regular select input register can never be at offset
                         * 0, and we only print register value for regular case.
                         */
                        if (ipctl->input_sel_base)
                                writel(pin->input_val, ipctl->input_sel_base +
                                                pin->input_reg);
                        else
                                writel(pin->input_val, ipctl->base +
                                                pin->input_reg);
                        dev_dbg(ipctl->dev,
                                "==>select_input: offset 0x%x val 0x%x\n",
                                pin->input_reg, pin->input_val);
                }
        }

        return 0;
}

static int imx_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
{
        struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
        const struct imx_pinctrl_soc_info *info = ipctl->info;

        return info->nfunctions;
}

static const char *imx_pmx_get_func_name(struct pinctrl_dev *pctldev,
                                          unsigned selector)
{
        struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
        const struct imx_pinctrl_soc_info *info = ipctl->info;

        return info->functions[selector].name;
}

static int imx_pmx_get_groups(struct pinctrl_dev *pctldev, unsigned selector,
                               const char * const **groups,
                               unsigned * const num_groups)
{
        struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
        const struct imx_pinctrl_soc_info *info = ipctl->info;

        *groups = info->functions[selector].groups;
        *num_groups = info->functions[selector].num_groups;

        return 0;
}

static int imx_pmx_gpio_request_enable(struct pinctrl_dev *pctldev,
                        struct pinctrl_gpio_range *range, unsigned offset)
{
        struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
        const struct imx_pinctrl_soc_info *info = ipctl->info;
        const struct imx_pin_reg *pin_reg;
        struct imx_pin_group *grp;
        struct imx_pin *imx_pin;
        unsigned int pin, group;
        u32 reg;

        /* Currently implementation only for shared mux/conf register */
        if (!(info->flags & SHARE_MUX_CONF_REG))
                return -EINVAL;

        pin_reg = &info->pin_regs[offset];
        if (pin_reg->mux_reg == -1)
                return -EINVAL;

        /* Find the pinctrl config with GPIO mux mode for the requested pin */
        for (group = 0; group < info->ngroups; group++) {
                grp = &info->groups[group];
                for (pin = 0; pin < grp->npins; pin++) {
                        imx_pin = &grp->pins[pin];
                        if (imx_pin->pin == offset && !imx_pin->mux_mode)
                                goto mux_pin;
                }
        }

        return -EINVAL;

mux_pin:
        reg = readl(ipctl->base + pin_reg->mux_reg);
        reg &= ~(0x7 << 20);
        reg |= imx_pin->config;
        writel(reg, ipctl->base + pin_reg->mux_reg);

        return 0;
}

static void imx_pmx_gpio_disable_free(struct pinctrl_dev *pctldev,
                        struct pinctrl_gpio_range *range, unsigned offset)
{
        struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
        const struct imx_pinctrl_soc_info *info = ipctl->info;
        const struct imx_pin_reg *pin_reg;
        u32 reg;

        /*
         * Only Vybrid has the input/output buffer enable flags (IBE/OBE)
         * They are part of the shared mux/conf register.
         */
        if (!(info->flags & SHARE_MUX_CONF_REG))
                return;

        pin_reg = &info->pin_regs[offset];
        if (pin_reg->mux_reg == -1)
                return;

        /* Clear IBE/OBE/PUE to disable the pin (Hi-Z) */
        reg = readl(ipctl->base + pin_reg->mux_reg);
        reg &= ~0x7;
        writel(reg, ipctl->base + pin_reg->mux_reg);
}

static int imx_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
           struct pinctrl_gpio_range *range, unsigned offset, bool input)
{
        struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
        const struct imx_pinctrl_soc_info *info = ipctl->info;
        const struct imx_pin_reg *pin_reg;
        u32 reg;

        /*
         * Only Vybrid has the input/output buffer enable flags (IBE/OBE)
         * They are part of the shared mux/conf register.
         */
        if (!(info->flags & SHARE_MUX_CONF_REG))
                return -EINVAL;

        pin_reg = &info->pin_regs[offset];
        if (pin_reg->mux_reg == -1)
                return -EINVAL;

        /* IBE always enabled allows us to read the value "on the wire" */
        reg = readl(ipctl->base + pin_reg->mux_reg);
        if (input)
                reg &= ~0x2;
        else
                reg |= 0x2;
        writel(reg, ipctl->base + pin_reg->mux_reg);

        return 0;
}

static const struct pinmux_ops imx_pmx_ops = {
        .get_functions_count = imx_pmx_get_funcs_count,
        .get_function_name = imx_pmx_get_func_name,
        .get_function_groups = imx_pmx_get_groups,
        .set_mux = imx_pmx_set,
        .gpio_request_enable = imx_pmx_gpio_request_enable,
        .gpio_disable_free = imx_pmx_gpio_disable_free,
        .gpio_set_direction = imx_pmx_gpio_set_direction,
};

static int imx_pinconf_get(struct pinctrl_dev *pctldev,
                             unsigned pin_id, unsigned long *config)
{
        struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
        const struct imx_pinctrl_soc_info *info = ipctl->info;
        const struct imx_pin_reg *pin_reg = &info->pin_regs[pin_id];

        if (pin_reg->conf_reg == -1) {
                dev_err(info->dev, "Pin(%s) does not support config function\n",
                        info->pins[pin_id].name);
                return -EINVAL;
        }

        *config = readl(ipctl->base + pin_reg->conf_reg);

        if (info->flags & SHARE_MUX_CONF_REG)
                *config &= 0xffff;

        return 0;
}

static int imx_pinconf_set(struct pinctrl_dev *pctldev,
                             unsigned pin_id, unsigned long *configs,
                             unsigned num_configs)
{
        struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
        const struct imx_pinctrl_soc_info *info = ipctl->info;
        const struct imx_pin_reg *pin_reg = &info->pin_regs[pin_id];
        int i;

        if (pin_reg->conf_reg == -1) {
                dev_err(info->dev, "Pin(%s) does not support config function\n",
                        info->pins[pin_id].name);
                return -EINVAL;
        }

        dev_dbg(ipctl->dev, "pinconf set pin %s\n",
                info->pins[pin_id].name);

        for (i = 0; i < num_configs; i++) {
                if (info->flags & SHARE_MUX_CONF_REG) {
                        u32 reg;
                        reg = readl(ipctl->base + pin_reg->conf_reg);
                        reg &= ~0xffff;
                        reg |= configs[i];
                        writel(reg, ipctl->base + pin_reg->conf_reg);
                } else {
                        writel(configs[i], ipctl->base + pin_reg->conf_reg);
                }
                dev_dbg(ipctl->dev, "write: offset 0x%x val 0x%lx\n",
                        pin_reg->conf_reg, configs[i]);
        } /* for each config */

        return 0;
}

static void imx_pinconf_dbg_show(struct pinctrl_dev *pctldev,
                                   struct seq_file *s, unsigned pin_id)
{
        struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
        const struct imx_pinctrl_soc_info *info = ipctl->info;
        const struct imx_pin_reg *pin_reg = &info->pin_regs[pin_id];
        unsigned long config;

        if (!pin_reg || pin_reg->conf_reg == -1) {
                seq_printf(s, "N/A");
                return;
        }

        config = readl(ipctl->base + pin_reg->conf_reg);
        seq_printf(s, "0x%lx", config);
}

static void imx_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
                                         struct seq_file *s, unsigned group)
{
        struct imx_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
        const struct imx_pinctrl_soc_info *info = ipctl->info;
        struct imx_pin_group *grp;
        unsigned long config;
        const char *name;
        int i, ret;

        if (group > info->ngroups)
                return;

        seq_printf(s, "\n");
        grp = &info->groups[group];
        for (i = 0; i < grp->npins; i++) {
                struct imx_pin *pin = &grp->pins[i];
                name = pin_get_name(pctldev, pin->pin);
                ret = imx_pinconf_get(pctldev, pin->pin, &config);
                if (ret)
                        return;
                seq_printf(s, "%s: 0x%lx", name, config);
        }
}

static const struct pinconf_ops imx_pinconf_ops = {
        .pin_config_get = imx_pinconf_get,
        .pin_config_set = imx_pinconf_set,
        .pin_config_dbg_show = imx_pinconf_dbg_show,
        .pin_config_group_dbg_show = imx_pinconf_group_dbg_show,
};

static struct pinctrl_desc imx_pinctrl_desc = {
        .pctlops = &imx_pctrl_ops,
        .pmxops = &imx_pmx_ops,
        .confops = &imx_pinconf_ops,
        .owner = THIS_MODULE,
};

/*
 * Each pin represented in fsl,pins consists of 5 u32 PIN_FUNC_ID and
 * 1 u32 CONFIG, so 24 types in total for each pin.
 */
#define FSL_PIN_SIZE 24
#define SHARE_FSL_PIN_SIZE 20

static int imx_pinctrl_parse_groups(struct device_node *np,
                                    struct imx_pin_group *grp,
                                    struct imx_pinctrl_soc_info *info,
                                    u32 index)
{
        int size, pin_size;
        const __be32 *list;
        int i;
        u32 config;

        dev_dbg(info->dev, "group(%d): %s\n", index, np->name);

        if (info->flags & SHARE_MUX_CONF_REG)
                pin_size = SHARE_FSL_PIN_SIZE;
        else
                pin_size = FSL_PIN_SIZE;
        /* Initialise group */
        grp->name = np->name;

        /*
         * the binding format is fsl,pins = <PIN_FUNC_ID CONFIG ...>,
         * do sanity check and calculate pins number
         */
        list = of_get_property(np, "fsl,pins", &size);
        if (!list) {
                dev_err(info->dev, "no fsl,pins property in node %s\n", np->full_name);
                return -EINVAL;
        }

        /* we do not check return since it's safe node passed down */
        if (!size || size % pin_size) {
                dev_err(info->dev, "Invalid fsl,pins property in node %s\n", np->full_name);
                return -EINVAL;
        }

        grp->npins = size / pin_size;
        grp->pins = devm_kzalloc(info->dev, grp->npins * sizeof(struct imx_pin),
                                GFP_KERNEL);
        grp->pin_ids = devm_kzalloc(info->dev, grp->npins * sizeof(unsigned int),
                                GFP_KERNEL);
        if (!grp->pins || ! grp->pin_ids)
                return -ENOMEM;

        for (i = 0; i < grp->npins; i++) {
                u32 mux_reg = be32_to_cpu(*list++);
                u32 conf_reg;
                unsigned int pin_id;
                struct imx_pin_reg *pin_reg;
                struct imx_pin *pin = &grp->pins[i];

                if (!(info->flags & ZERO_OFFSET_VALID) && !mux_reg)
                        mux_reg = -1;

                if (info->flags & SHARE_MUX_CONF_REG) {
                        conf_reg = mux_reg;
                } else {
                        conf_reg = be32_to_cpu(*list++);
                        if (!conf_reg)
                                conf_reg = -1;
                }

                pin_id = (mux_reg != -1) ? mux_reg / 4 : conf_reg / 4;
                pin_reg = &info->pin_regs[pin_id];
                pin->pin = pin_id;
                grp->pin_ids[i] = pin_id;
                pin_reg->mux_reg = mux_reg;
                pin_reg->conf_reg = conf_reg;
                pin->input_reg = be32_to_cpu(*list++);
                pin->mux_mode = be32_to_cpu(*list++);
                pin->input_val = be32_to_cpu(*list++);

                /* SION bit is in mux register */
                config = be32_to_cpu(*list++);
                if (config & IMX_PAD_SION)
                        pin->mux_mode |= IOMUXC_CONFIG_SION;
                pin->config = config & ~IMX_PAD_SION;

                dev_dbg(info->dev, "%s: 0x%x 0x%08lx", info->pins[pin_id].name,
                                pin->mux_mode, pin->config);
        }

        return 0;
}

static int imx_pinctrl_parse_functions(struct device_node *np,
                                       struct imx_pinctrl_soc_info *info,
                                       u32 index)
{
        struct device_node *child;
        struct imx_pmx_func *func;
        struct imx_pin_group *grp;
        u32 i = 0;

        dev_dbg(info->dev, "parse function(%d): %s\n", index, np->name);

        func = &info->functions[index];

        /* Initialise function */
        func->name = np->name;
        func->num_groups = of_get_child_count(np);
        if (func->num_groups == 0) {
                dev_err(info->dev, "no groups defined in %s\n", np->full_name);
                return -EINVAL;
        }
        func->groups = devm_kzalloc(info->dev,
                        func->num_groups * sizeof(char *), GFP_KERNEL);

        for_each_child_of_node(np, child) {
                func->groups[i] = child->name;
                grp = &info->groups[info->group_index++];
                imx_pinctrl_parse_groups(child, grp, info, i++);
        }

        return 0;
}

/*
 * Check if the DT contains pins in the direct child nodes. This indicates the
 * newer DT format to store pins. This function returns true if the first found
 * fsl,pins property is in a child of np. Otherwise false is returned.
 */
static bool imx_pinctrl_dt_is_flat_functions(struct device_node *np)
{
        struct device_node *function_np;
        struct device_node *pinctrl_np;

        for_each_child_of_node(np, function_np) {
                if (of_property_read_bool(function_np, "fsl,pins"))
                        return true;

                for_each_child_of_node(function_np, pinctrl_np) {
                        if (of_property_read_bool(pinctrl_np, "fsl,pins"))
                                return false;
                }
        }

        return true;
}

static int imx_pinctrl_probe_dt(struct platform_device *pdev,
                                struct imx_pinctrl_soc_info *info)
{
        struct device_node *np = pdev->dev.of_node;
        struct device_node *child;
        u32 nfuncs = 0;
        u32 i = 0;
        bool flat_funcs;

        if (!np)
                return -ENODEV;

        flat_funcs = imx_pinctrl_dt_is_flat_functions(np);
        if (flat_funcs) {
                nfuncs = 1;
        } else {
                nfuncs = of_get_child_count(np);
                if (nfuncs <= 0) {
                        dev_err(&pdev->dev, "no functions defined\n");
                        return -EINVAL;
                }
        }

        info->nfunctions = nfuncs;
        info->functions = devm_kzalloc(&pdev->dev, nfuncs * sizeof(struct imx_pmx_func),
                                        GFP_KERNEL);
        if (!info->functions)
                return -ENOMEM;

        if (flat_funcs) {
                info->ngroups = of_get_child_count(np);
        } else {
                info->ngroups = 0;
                for_each_child_of_node(np, child)
                        info->ngroups += of_get_child_count(child);
        }
        info->groups = devm_kzalloc(&pdev->dev, info->ngroups * sizeof(struct imx_pin_group),
                                        GFP_KERNEL);
        if (!info->groups)
                return -ENOMEM;

        if (flat_funcs) {
                imx_pinctrl_parse_functions(np, info, 0);
        } else {
                for_each_child_of_node(np, child)
                        imx_pinctrl_parse_functions(child, info, i++);
        }

        return 0;
}

int imx_pinctrl_probe(struct platform_device *pdev,
                      struct imx_pinctrl_soc_info *info)
{
        struct regmap_config config = { .name = "gpr" };
        struct device_node *dev_np = pdev->dev.of_node;
        struct device_node *np;
        struct imx_pinctrl *ipctl;
        struct resource *res;
        struct regmap *gpr;
        int ret, i;

        if (!info || !info->pins || !info->npins) {
                dev_err(&pdev->dev, "wrong pinctrl info\n");
                return -EINVAL;
        }
        info->dev = &pdev->dev;

        if (info->gpr_compatible) {
                gpr = syscon_regmap_lookup_by_compatible(info->gpr_compatible);
                if (!IS_ERR(gpr))
                        regmap_attach_dev(&pdev->dev, gpr, &config);
        }

        /* Create state holders etc for this driver */
        ipctl = devm_kzalloc(&pdev->dev, sizeof(*ipctl), GFP_KERNEL);
        if (!ipctl)
                return -ENOMEM;

        info->pin_regs = devm_kmalloc(&pdev->dev, sizeof(*info->pin_regs) *
                                      info->npins, GFP_KERNEL);
        if (!info->pin_regs)
                return -ENOMEM;

        for (i = 0; i < info->npins; i++) {
                info->pin_regs[i].mux_reg = -1;
                info->pin_regs[i].conf_reg = -1;
        }

        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        ipctl->base = devm_ioremap_resource(&pdev->dev, res);
        if (IS_ERR(ipctl->base))
                return PTR_ERR(ipctl->base);

        if (of_property_read_bool(dev_np, "fsl,input-sel")) {
                np = of_parse_phandle(dev_np, "fsl,input-sel", 0);
                if (!np) {
                        dev_err(&pdev->dev, "iomuxc fsl,input-sel property not found\n");
                        return -EINVAL;
                }

                ipctl->input_sel_base = of_iomap(np, 0);
                of_node_put(np);
                if (!ipctl->input_sel_base) {
                        dev_err(&pdev->dev,
                                "iomuxc input select base address not found\n");
                        return -ENOMEM;
                }
        }

        imx_pinctrl_desc.name = dev_name(&pdev->dev);
        imx_pinctrl_desc.pins = info->pins;
        imx_pinctrl_desc.npins = info->npins;

        ret = imx_pinctrl_probe_dt(pdev, info);
        if (ret) {
                dev_err(&pdev->dev, "fail to probe dt properties\n");
                return ret;
        }

        ipctl->info = info;
        ipctl->dev = info->dev;
        platform_set_drvdata(pdev, ipctl);
        ipctl->pctl = pinctrl_register(&imx_pinctrl_desc, &pdev->dev, ipctl);
        if (IS_ERR(ipctl->pctl)) {
                dev_err(&pdev->dev, "could not register IMX pinctrl driver\n");
                return PTR_ERR(ipctl->pctl);
        }

        dev_info(&pdev->dev, "initialized IMX pinctrl driver\n");

        return 0;
}

int imx_pinctrl_remove(struct platform_device *pdev)
{
        struct imx_pinctrl *ipctl = platform_get_drvdata(pdev);

        pinctrl_unregister(ipctl->pctl);

        return 0;
}