// SPDX-License-Identifier: GPL-2.0
/*
 * SuperH Pin Function Controller pinmux support.
 *
 * Copyright (C) 2012  Paul Mundt
 */

#define DRV_NAME "sh-pfc"

#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/slab.h>
#include <linux/spinlock.h>

#include "core.h"
#include "../core.h"
#include "../pinconf.h"

struct sh_pfc_pin_config {
        unsigned int mux_mark;
        bool mux_set;
        bool gpio_enabled;
};

struct sh_pfc_pinctrl {
        struct pinctrl_dev *pctl;
        struct pinctrl_desc pctl_desc;

        struct sh_pfc *pfc;

        struct pinctrl_pin_desc *pins;
        struct sh_pfc_pin_config *configs;

        const char *func_prop_name;
        const char *groups_prop_name;
        const char *pins_prop_name;
};

static int sh_pfc_get_groups_count(struct pinctrl_dev *pctldev)
{
        struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

        return pmx->pfc->info->nr_groups;
}

static const char *sh_pfc_get_group_name(struct pinctrl_dev *pctldev,
                                         unsigned selector)
{
        struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

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

static int sh_pfc_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector,
                                 const unsigned **pins, unsigned *num_pins)
{
        struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

        *pins = pmx->pfc->info->groups[selector].pins;
        *num_pins = pmx->pfc->info->groups[selector].nr_pins;

        return 0;
}

static void sh_pfc_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
                                unsigned offset)
{
        seq_puts(s, DRV_NAME);
}

#ifdef CONFIG_OF
static int sh_pfc_map_add_config(struct pinctrl_map *map,
                                 const char *group_or_pin,
                                 enum pinctrl_map_type type,
                                 unsigned long *configs,
                                 unsigned int num_configs)
{
        unsigned long *cfgs;

        cfgs = kmemdup(configs, num_configs * sizeof(*cfgs),
                       GFP_KERNEL);
        if (cfgs == NULL)
                return -ENOMEM;

        map->type = type;
        map->data.configs.group_or_pin = group_or_pin;
        map->data.configs.configs = cfgs;
        map->data.configs.num_configs = num_configs;

        return 0;
}

static int sh_pfc_dt_subnode_to_map(struct pinctrl_dev *pctldev,
                                    struct device_node *np,
                                    struct pinctrl_map **map,
                                    unsigned int *num_maps, unsigned int *index)
{
        struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
        struct device *dev = pmx->pfc->dev;
        struct pinctrl_map *maps = *map;
        unsigned int nmaps = *num_maps;
        unsigned int idx = *index;
        unsigned int num_configs;
        const char *function = NULL;
        unsigned long *configs;
        struct property *prop;
        unsigned int num_groups;
        unsigned int num_pins;
        const char *group;
        const char *pin;
        int ret;

        /* Support both the old Renesas-specific properties and the new standard
         * properties. Mixing old and new properties isn't allowed, neither
         * inside a subnode nor across subnodes.
         */
        if (!pmx->func_prop_name) {
                if (of_find_property(np, "groups", NULL) ||
                    of_find_property(np, "pins", NULL)) {
                        pmx->func_prop_name = "function";
                        pmx->groups_prop_name = "groups";
                        pmx->pins_prop_name = "pins";
                } else {
                        pmx->func_prop_name = "renesas,function";
                        pmx->groups_prop_name = "renesas,groups";
                        pmx->pins_prop_name = "renesas,pins";
                }
        }

        /* Parse the function and configuration properties. At least a function
         * or one configuration must be specified.
         */
        ret = of_property_read_string(np, pmx->func_prop_name, &function);
        if (ret < 0 && ret != -EINVAL) {
                dev_err(dev, "Invalid function in DT\n");
                return ret;
        }

        ret = pinconf_generic_parse_dt_config(np, NULL, &configs, &num_configs);
        if (ret < 0)
                return ret;

        if (!function && num_configs == 0) {
                dev_err(dev,
                        "DT node must contain at least a function or config\n");
                ret = -ENODEV;
                goto done;
        }

        /* Count the number of pins and groups and reallocate mappings. */
        ret = of_property_count_strings(np, pmx->pins_prop_name);
        if (ret == -EINVAL) {
                num_pins = 0;
        } else if (ret < 0) {
                dev_err(dev, "Invalid pins list in DT\n");
                goto done;
        } else {
                num_pins = ret;
        }

        ret = of_property_count_strings(np, pmx->groups_prop_name);
        if (ret == -EINVAL) {
                num_groups = 0;
        } else if (ret < 0) {
                dev_err(dev, "Invalid pin groups list in DT\n");
                goto done;
        } else {
                num_groups = ret;
        }

        if (!num_pins && !num_groups) {
                dev_err(dev, "No pin or group provided in DT node\n");
                ret = -ENODEV;
                goto done;
        }

        if (function)
                nmaps += num_groups;
        if (configs)
                nmaps += num_pins + num_groups;

        maps = krealloc(maps, sizeof(*maps) * nmaps, GFP_KERNEL);
        if (maps == NULL) {
                ret = -ENOMEM;
                goto done;
        }

        *map = maps;
        *num_maps = nmaps;

        /* Iterate over pins and groups and create the mappings. */
        of_property_for_each_string(np, pmx->groups_prop_name, prop, group) {
                if (function) {
                        maps[idx].type = PIN_MAP_TYPE_MUX_GROUP;
                        maps[idx].data.mux.group = group;
                        maps[idx].data.mux.function = function;
                        idx++;
                }

                if (configs) {
                        ret = sh_pfc_map_add_config(&maps[idx], group,
                                                    PIN_MAP_TYPE_CONFIGS_GROUP,
                                                    configs, num_configs);
                        if (ret < 0)
                                goto done;

                        idx++;
                }
        }

        if (!configs) {
                ret = 0;
                goto done;
        }

        of_property_for_each_string(np, pmx->pins_prop_name, prop, pin) {
                ret = sh_pfc_map_add_config(&maps[idx], pin,
                                            PIN_MAP_TYPE_CONFIGS_PIN,
                                            configs, num_configs);
                if (ret < 0)
                        goto done;

                idx++;
        }

done:
        *index = idx;
        kfree(configs);
        return ret;
}

static void sh_pfc_dt_free_map(struct pinctrl_dev *pctldev,
                               struct pinctrl_map *map, unsigned num_maps)
{
        unsigned int i;

        if (map == NULL)
                return;

        for (i = 0; i < num_maps; ++i) {
                if (map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP ||
                    map[i].type == PIN_MAP_TYPE_CONFIGS_PIN)
                        kfree(map[i].data.configs.configs);
        }

        kfree(map);
}

static int sh_pfc_dt_node_to_map(struct pinctrl_dev *pctldev,
                                 struct device_node *np,
                                 struct pinctrl_map **map, unsigned *num_maps)
{
        struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
        struct device *dev = pmx->pfc->dev;
        struct device_node *child;
        unsigned int index;
        int ret;

        *map = NULL;
        *num_maps = 0;
        index = 0;

        for_each_child_of_node(np, child) {
                ret = sh_pfc_dt_subnode_to_map(pctldev, child, map, num_maps,
                                               &index);
                if (ret < 0) {
                        of_node_put(child);
                        goto done;
                }
        }

        /* If no mapping has been found in child nodes try the config node. */
        if (*num_maps == 0) {
                ret = sh_pfc_dt_subnode_to_map(pctldev, np, map, num_maps,
                                               &index);
                if (ret < 0)
                        goto done;
        }

        if (*num_maps)
                return 0;

        dev_err(dev, "no mapping found in node %pOF\n", np);
        ret = -EINVAL;

done:
        if (ret < 0)
                sh_pfc_dt_free_map(pctldev, *map, *num_maps);

        return ret;
}
#endif /* CONFIG_OF */

static const struct pinctrl_ops sh_pfc_pinctrl_ops = {
        .get_groups_count       = sh_pfc_get_groups_count,
        .get_group_name         = sh_pfc_get_group_name,
        .get_group_pins         = sh_pfc_get_group_pins,
        .pin_dbg_show           = sh_pfc_pin_dbg_show,
#ifdef CONFIG_OF
        .dt_node_to_map         = sh_pfc_dt_node_to_map,
        .dt_free_map            = sh_pfc_dt_free_map,
#endif
};

static int sh_pfc_get_functions_count(struct pinctrl_dev *pctldev)
{
        struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

        return pmx->pfc->info->nr_functions;
}

static const char *sh_pfc_get_function_name(struct pinctrl_dev *pctldev,
                                            unsigned selector)
{
        struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

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

static int sh_pfc_get_function_groups(struct pinctrl_dev *pctldev,
                                      unsigned selector,
                                      const char * const **groups,
                                      unsigned * const num_groups)
{
        struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);

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

        return 0;
}

static int sh_pfc_func_set_mux(struct pinctrl_dev *pctldev, unsigned selector,
                               unsigned group)
{
        struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
        struct sh_pfc *pfc = pmx->pfc;
        const struct sh_pfc_pin_group *grp = &pfc->info->groups[group];
        unsigned long flags;
        unsigned int i;
        int ret = 0;

        dev_dbg(pctldev->dev, "Configuring pin group %s\n", grp->name);

        spin_lock_irqsave(&pfc->lock, flags);

        for (i = 0; i < grp->nr_pins; ++i) {
                int idx = sh_pfc_get_pin_index(pfc, grp->pins[i]);
                struct sh_pfc_pin_config *cfg = &pmx->configs[idx];

                /*
                 * This driver cannot manage both gpio and mux when the gpio
                 * pin is already enabled. So, this function fails.
                 */
                if (cfg->gpio_enabled) {
                        ret = -EBUSY;
                        goto done;
                }

                ret = sh_pfc_config_mux(pfc, grp->mux[i], PINMUX_TYPE_FUNCTION);
                if (ret < 0)
                        goto done;
        }

        /* All group pins are configured, mark the pins as mux_set */
        for (i = 0; i < grp->nr_pins; ++i) {
                int idx = sh_pfc_get_pin_index(pfc, grp->pins[i]);
                struct sh_pfc_pin_config *cfg = &pmx->configs[idx];

                cfg->mux_set = true;
                cfg->mux_mark = grp->mux[i];
        }

done:
        spin_unlock_irqrestore(&pfc->lock, flags);
        return ret;
}

static int sh_pfc_gpio_request_enable(struct pinctrl_dev *pctldev,
                                      struct pinctrl_gpio_range *range,
                                      unsigned offset)
{
        struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
        struct sh_pfc *pfc = pmx->pfc;
        int idx = sh_pfc_get_pin_index(pfc, offset);
        struct sh_pfc_pin_config *cfg = &pmx->configs[idx];
        unsigned long flags;
        int ret;

        spin_lock_irqsave(&pfc->lock, flags);

        if (!pfc->gpio) {
                /* If GPIOs are handled externally the pin mux type need to be
                 * set to GPIO here.
                 */
                const struct sh_pfc_pin *pin = &pfc->info->pins[idx];

                ret = sh_pfc_config_mux(pfc, pin->enum_id, PINMUX_TYPE_GPIO);
                if (ret < 0)
                        goto done;
        }

        cfg->gpio_enabled = true;

        ret = 0;

done:
        spin_unlock_irqrestore(&pfc->lock, flags);

        return ret;
}

static void sh_pfc_gpio_disable_free(struct pinctrl_dev *pctldev,
                                     struct pinctrl_gpio_range *range,
                                     unsigned offset)
{
        struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
        struct sh_pfc *pfc = pmx->pfc;
        int idx = sh_pfc_get_pin_index(pfc, offset);
        struct sh_pfc_pin_config *cfg = &pmx->configs[idx];
        unsigned long flags;

        spin_lock_irqsave(&pfc->lock, flags);
        cfg->gpio_enabled = false;
        /* If mux is already set, this configures it here */
        if (cfg->mux_set)
                sh_pfc_config_mux(pfc, cfg->mux_mark, PINMUX_TYPE_FUNCTION);
        spin_unlock_irqrestore(&pfc->lock, flags);
}

static int sh_pfc_gpio_set_direction(struct pinctrl_dev *pctldev,
                                     struct pinctrl_gpio_range *range,
                                     unsigned offset, bool input)
{
        struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
        struct sh_pfc *pfc = pmx->pfc;
        int new_type = input ? PINMUX_TYPE_INPUT : PINMUX_TYPE_OUTPUT;
        int idx = sh_pfc_get_pin_index(pfc, offset);
        const struct sh_pfc_pin *pin = &pfc->info->pins[idx];
        unsigned long flags;
        unsigned int dir;
        int ret;

        /* Check if the requested direction is supported by the pin. Not all SoC
         * provide pin config data, so perform the check conditionally.
         */
        if (pin->configs) {
                dir = input ? SH_PFC_PIN_CFG_INPUT : SH_PFC_PIN_CFG_OUTPUT;
                if (!(pin->configs & dir))
                        return -EINVAL;
        }

        spin_lock_irqsave(&pfc->lock, flags);

        ret = sh_pfc_config_mux(pfc, pin->enum_id, new_type);
        if (ret < 0)
                goto done;

done:
        spin_unlock_irqrestore(&pfc->lock, flags);
        return ret;
}

static const struct pinmux_ops sh_pfc_pinmux_ops = {
        .get_functions_count    = sh_pfc_get_functions_count,
        .get_function_name      = sh_pfc_get_function_name,
        .get_function_groups    = sh_pfc_get_function_groups,
        .set_mux                = sh_pfc_func_set_mux,
        .gpio_request_enable    = sh_pfc_gpio_request_enable,
        .gpio_disable_free      = sh_pfc_gpio_disable_free,
        .gpio_set_direction     = sh_pfc_gpio_set_direction,
};

static u32 sh_pfc_pinconf_find_drive_strength_reg(struct sh_pfc *pfc,
                unsigned int pin, unsigned int *offset, unsigned int *size)
{
        const struct pinmux_drive_reg_field *field;
        const struct pinmux_drive_reg *reg;
        unsigned int i;

        for (reg = pfc->info->drive_regs; reg->reg; ++reg) {
                for (i = 0; i < ARRAY_SIZE(reg->fields); ++i) {
                        field = &reg->fields[i];

                        if (field->size && field->pin == pin) {
                                *offset = field->offset;
                                *size = field->size;

                                return reg->reg;
                        }
                }
        }

        return 0;
}

static int sh_pfc_pinconf_get_drive_strength(struct sh_pfc *pfc,
                                             unsigned int pin)
{
        unsigned long flags;
        unsigned int offset;
        unsigned int size;
        u32 reg;
        u32 val;

        reg = sh_pfc_pinconf_find_drive_strength_reg(pfc, pin, &offset, &size);
        if (!reg)
                return -EINVAL;

        spin_lock_irqsave(&pfc->lock, flags);
        val = sh_pfc_read(pfc, reg);
        spin_unlock_irqrestore(&pfc->lock, flags);

        val = (val >> offset) & GENMASK(size - 1, 0);

        /* Convert the value to mA based on a full drive strength value of 24mA.
         * We can make the full value configurable later if needed.
         */
        return (val + 1) * (size == 2 ? 6 : 3);
}

static int sh_pfc_pinconf_set_drive_strength(struct sh_pfc *pfc,
                                             unsigned int pin, u16 strength)
{
        unsigned long flags;
        unsigned int offset;
        unsigned int size;
        unsigned int step;
        u32 reg;
        u32 val;

        reg = sh_pfc_pinconf_find_drive_strength_reg(pfc, pin, &offset, &size);
        if (!reg)
                return -EINVAL;

        step = size == 2 ? 6 : 3;

        if (strength < step || strength > 24)
                return -EINVAL;

        /* Convert the value from mA based on a full drive strength value of
         * 24mA. We can make the full value configurable later if needed.
         */
        strength = strength / step - 1;

        spin_lock_irqsave(&pfc->lock, flags);

        val = sh_pfc_read(pfc, reg);
        val &= ~GENMASK(offset + size - 1, offset);
        val |= strength << offset;

        sh_pfc_write(pfc, reg, val);

        spin_unlock_irqrestore(&pfc->lock, flags);

        return 0;
}

/* Check whether the requested parameter is supported for a pin. */
static bool sh_pfc_pinconf_validate(struct sh_pfc *pfc, unsigned int _pin,
                                    enum pin_config_param param)
{
        int idx = sh_pfc_get_pin_index(pfc, _pin);
        const struct sh_pfc_pin *pin = &pfc->info->pins[idx];

        switch (param) {
        case PIN_CONFIG_BIAS_DISABLE:
                return pin->configs & SH_PFC_PIN_CFG_PULL_UP_DOWN;

        case PIN_CONFIG_BIAS_PULL_UP:
                return pin->configs & SH_PFC_PIN_CFG_PULL_UP;

        case PIN_CONFIG_BIAS_PULL_DOWN:
                return pin->configs & SH_PFC_PIN_CFG_PULL_DOWN;

        case PIN_CONFIG_DRIVE_STRENGTH:
                return pin->configs & SH_PFC_PIN_CFG_DRIVE_STRENGTH;

        case PIN_CONFIG_POWER_SOURCE:
                return pin->configs & SH_PFC_PIN_CFG_IO_VOLTAGE;

        default:
                return false;
        }
}

static int sh_pfc_pinconf_get(struct pinctrl_dev *pctldev, unsigned _pin,
                              unsigned long *config)
{
        struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
        struct sh_pfc *pfc = pmx->pfc;
        enum pin_config_param param = pinconf_to_config_param(*config);
        unsigned long flags;
        unsigned int arg;

        if (!sh_pfc_pinconf_validate(pfc, _pin, param))
                return -ENOTSUPP;

        switch (param) {
        case PIN_CONFIG_BIAS_DISABLE:
        case PIN_CONFIG_BIAS_PULL_UP:
        case PIN_CONFIG_BIAS_PULL_DOWN: {
                unsigned int bias;

                if (!pfc->info->ops || !pfc->info->ops->get_bias)
                        return -ENOTSUPP;

                spin_lock_irqsave(&pfc->lock, flags);
                bias = pfc->info->ops->get_bias(pfc, _pin);
                spin_unlock_irqrestore(&pfc->lock, flags);

                if (bias != param)
                        return -EINVAL;

                arg = 0;
                break;
        }

        case PIN_CONFIG_DRIVE_STRENGTH: {
                int ret;

                ret = sh_pfc_pinconf_get_drive_strength(pfc, _pin);
                if (ret < 0)
                        return ret;

                arg = ret;
                break;
        }

        case PIN_CONFIG_POWER_SOURCE: {
                u32 pocctrl, val;
                int bit;

                if (!pfc->info->ops || !pfc->info->ops->pin_to_pocctrl)
                        return -ENOTSUPP;

                bit = pfc->info->ops->pin_to_pocctrl(pfc, _pin, &pocctrl);
                if (WARN(bit < 0, "invalid pin %#x", _pin))
                        return bit;

                spin_lock_irqsave(&pfc->lock, flags);
                val = sh_pfc_read(pfc, pocctrl);
                spin_unlock_irqrestore(&pfc->lock, flags);

                arg = (val & BIT(bit)) ? 3300 : 1800;
                break;
        }

        default:
                return -ENOTSUPP;
        }

        *config = pinconf_to_config_packed(param, arg);
        return 0;
}

static int sh_pfc_pinconf_set(struct pinctrl_dev *pctldev, unsigned _pin,
                              unsigned long *configs, unsigned num_configs)
{
        struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
        struct sh_pfc *pfc = pmx->pfc;
        enum pin_config_param param;
        unsigned long flags;
        unsigned int i;

        for (i = 0; i < num_configs; i++) {
                param = pinconf_to_config_param(configs[i]);

                if (!sh_pfc_pinconf_validate(pfc, _pin, param))
                        return -ENOTSUPP;

                switch (param) {
                case PIN_CONFIG_BIAS_PULL_UP:
                case PIN_CONFIG_BIAS_PULL_DOWN:
                case PIN_CONFIG_BIAS_DISABLE:
                        if (!pfc->info->ops || !pfc->info->ops->set_bias)
                                return -ENOTSUPP;

                        spin_lock_irqsave(&pfc->lock, flags);
                        pfc->info->ops->set_bias(pfc, _pin, param);
                        spin_unlock_irqrestore(&pfc->lock, flags);

                        break;

                case PIN_CONFIG_DRIVE_STRENGTH: {
                        unsigned int arg =
                                pinconf_to_config_argument(configs[i]);
                        int ret;

                        ret = sh_pfc_pinconf_set_drive_strength(pfc, _pin, arg);
                        if (ret < 0)
                                return ret;

                        break;
                }

                case PIN_CONFIG_POWER_SOURCE: {
                        unsigned int mV = pinconf_to_config_argument(configs[i]);
                        u32 pocctrl, val;
                        int bit;

                        if (!pfc->info->ops || !pfc->info->ops->pin_to_pocctrl)
                                return -ENOTSUPP;

                        bit = pfc->info->ops->pin_to_pocctrl(pfc, _pin, &pocctrl);
                        if (WARN(bit < 0, "invalid pin %#x", _pin))
                                return bit;

                        if (mV != 1800 && mV != 3300)
                                return -EINVAL;

                        spin_lock_irqsave(&pfc->lock, flags);
                        val = sh_pfc_read(pfc, pocctrl);
                        if (mV == 3300)
                                val |= BIT(bit);
                        else
                                val &= ~BIT(bit);
                        sh_pfc_write(pfc, pocctrl, val);
                        spin_unlock_irqrestore(&pfc->lock, flags);

                        break;
                }

                default:
                        return -ENOTSUPP;
                }
        } /* for each config */

        return 0;
}

static int sh_pfc_pinconf_group_set(struct pinctrl_dev *pctldev, unsigned group,
                                    unsigned long *configs,
                                    unsigned num_configs)
{
        struct sh_pfc_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
        const unsigned int *pins;
        unsigned int num_pins;
        unsigned int i, ret;

        pins = pmx->pfc->info->groups[group].pins;
        num_pins = pmx->pfc->info->groups[group].nr_pins;

        for (i = 0; i < num_pins; ++i) {
                ret = sh_pfc_pinconf_set(pctldev, pins[i], configs, num_configs);
                if (ret)
                        return ret;
        }

        return 0;
}

static const struct pinconf_ops sh_pfc_pinconf_ops = {
        .is_generic                     = true,
        .pin_config_get                 = sh_pfc_pinconf_get,
        .pin_config_set                 = sh_pfc_pinconf_set,
        .pin_config_group_set           = sh_pfc_pinconf_group_set,
        .pin_config_config_dbg_show     = pinconf_generic_dump_config,
};

/* PFC ranges -> pinctrl pin descs */
static int sh_pfc_map_pins(struct sh_pfc *pfc, struct sh_pfc_pinctrl *pmx)
{
        unsigned int i;

        /* Allocate and initialize the pins and configs arrays. */
        pmx->pins = devm_kcalloc(pfc->dev,
                                 pfc->info->nr_pins, sizeof(*pmx->pins),
                                 GFP_KERNEL);
        if (unlikely(!pmx->pins))
                return -ENOMEM;

        pmx->configs = devm_kcalloc(pfc->dev,
                                    pfc->info->nr_pins, sizeof(*pmx->configs),
                                    GFP_KERNEL);
        if (unlikely(!pmx->configs))
                return -ENOMEM;

        for (i = 0; i < pfc->info->nr_pins; ++i) {
                const struct sh_pfc_pin *info = &pfc->info->pins[i];
                struct pinctrl_pin_desc *pin = &pmx->pins[i];

                /* If the pin number is equal to -1 all pins are considered */
                pin->number = info->pin != (u16)-1 ? info->pin : i;
                pin->name = info->name;
        }

        return 0;
}

int sh_pfc_register_pinctrl(struct sh_pfc *pfc)
{
        struct sh_pfc_pinctrl *pmx;
        int ret;

        pmx = devm_kzalloc(pfc->dev, sizeof(*pmx), GFP_KERNEL);
        if (unlikely(!pmx))
                return -ENOMEM;

        pmx->pfc = pfc;

        ret = sh_pfc_map_pins(pfc, pmx);
        if (ret < 0)
                return ret;

        pmx->pctl_desc.name = DRV_NAME;
        pmx->pctl_desc.owner = THIS_MODULE;
        pmx->pctl_desc.pctlops = &sh_pfc_pinctrl_ops;
        pmx->pctl_desc.pmxops = &sh_pfc_pinmux_ops;
        pmx->pctl_desc.confops = &sh_pfc_pinconf_ops;
        pmx->pctl_desc.pins = pmx->pins;
        pmx->pctl_desc.npins = pfc->info->nr_pins;

        ret = devm_pinctrl_register_and_init(pfc->dev, &pmx->pctl_desc, pmx,
                                             &pmx->pctl);
        if (ret) {
                dev_err(pfc->dev, "could not register: %i\n", ret);

                return ret;
        }

        return pinctrl_enable(pmx->pctl);
}