// SPDX-License-Identifier: GPL-2.0
/*
 * MediaTek Pinctrl Moore Driver, which implement the generic dt-binding
 * pinctrl-bindings.txt for MediaTek SoC.
 *
 * Copyright (C) 2017-2018 MediaTek Inc.
 * Author: Sean Wang <sean.wang@mediatek.com>
 *
 */

#include <dt-bindings/pinctrl/mt65xx.h>
#include <linux/gpio/driver.h>

#include <linux/pinctrl/consumer.h>

#include "pinctrl-moore.h"

#define PINCTRL_PINCTRL_DEV             KBUILD_MODNAME

/* Custom pinconf parameters */
#define MTK_PIN_CONFIG_TDSEL    (PIN_CONFIG_END + 1)
#define MTK_PIN_CONFIG_RDSEL    (PIN_CONFIG_END + 2)
#define MTK_PIN_CONFIG_PU_ADV   (PIN_CONFIG_END + 3)
#define MTK_PIN_CONFIG_PD_ADV   (PIN_CONFIG_END + 4)

static const struct pinconf_generic_params mtk_custom_bindings[] = {
        {"mediatek,tdsel",      MTK_PIN_CONFIG_TDSEL,           0},
        {"mediatek,rdsel",      MTK_PIN_CONFIG_RDSEL,           0},
        {"mediatek,pull-up-adv", MTK_PIN_CONFIG_PU_ADV,         1},
        {"mediatek,pull-down-adv", MTK_PIN_CONFIG_PD_ADV,       1},
};

#ifdef CONFIG_DEBUG_FS
static const struct pin_config_item mtk_conf_items[] = {
        PCONFDUMP(MTK_PIN_CONFIG_TDSEL, "tdsel", NULL, true),
        PCONFDUMP(MTK_PIN_CONFIG_RDSEL, "rdsel", NULL, true),
        PCONFDUMP(MTK_PIN_CONFIG_PU_ADV, "pu-adv", NULL, true),
        PCONFDUMP(MTK_PIN_CONFIG_PD_ADV, "pd-adv", NULL, true),
};
#endif

static int mtk_pinmux_set_mux(struct pinctrl_dev *pctldev,
                              unsigned int selector, unsigned int group)
{
        struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
        const struct function_desc *func;
        struct group_desc *grp;
        int i, err;

        func = pinmux_generic_get_function(pctldev, selector);
        if (!func)
                return -EINVAL;

        grp = pinctrl_generic_get_group(pctldev, group);
        if (!grp)
                return -EINVAL;

        dev_dbg(pctldev->dev, "enable function %s group %s\n",
                func->func->name, grp->grp.name);

        for (i = 0; i < grp->grp.npins; i++) {
                const struct mtk_pin_desc *desc;
                int *pin_modes = grp->data;
                int pin = grp->grp.pins[i];

                desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin];
                if (!desc->name)
                        return -ENOTSUPP;

                err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_MODE,
                                       pin_modes[i]);

                if (err)
                        return err;
        }

        return 0;
}

static int mtk_pinmux_gpio_request_enable(struct pinctrl_dev *pctldev,
                                          struct pinctrl_gpio_range *range,
                                          unsigned int pin)
{
        struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
        const struct mtk_pin_desc *desc;

        desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin];
        if (!desc->name)
                return -ENOTSUPP;

        return mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_MODE,
                                hw->soc->gpio_m);
}

static int mtk_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev,
                                         struct pinctrl_gpio_range *range,
                                         unsigned int pin, bool input)
{
        struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
        const struct mtk_pin_desc *desc;

        desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin];
        if (!desc->name)
                return -ENOTSUPP;

        /* hardware would take 0 as input direction */
        return mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR, !input);
}

static int mtk_pinconf_get(struct pinctrl_dev *pctldev,
                           unsigned int pin, unsigned long *config)
{
        struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
        u32 param = pinconf_to_config_param(*config);
        int val, val2, err, pullup, reg, ret = 1;
        const struct mtk_pin_desc *desc;

        desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin];
        if (!desc->name)
                return -ENOTSUPP;

        switch (param) {
        case PIN_CONFIG_BIAS_DISABLE:
                if (hw->soc->bias_get_combo) {
                        err = hw->soc->bias_get_combo(hw, desc, &pullup, &ret);
                        if (err)
                                return err;
                        if (ret != MTK_PUPD_SET_R1R0_00 && ret != MTK_DISABLE)
                                return -EINVAL;
                } else if (hw->soc->bias_disable_get) {
                        err = hw->soc->bias_disable_get(hw, desc, &ret);
                        if (err)
                                return err;
                } else {
                        return -ENOTSUPP;
                }
                break;
        case PIN_CONFIG_BIAS_PULL_UP:
                if (hw->soc->bias_get_combo) {
                        err = hw->soc->bias_get_combo(hw, desc, &pullup, &ret);
                        if (err)
                                return err;
                        if (ret == MTK_PUPD_SET_R1R0_00 || ret == MTK_DISABLE)
                                return -EINVAL;
                        if (!pullup)
                                return -EINVAL;
                } else if (hw->soc->bias_get) {
                        err = hw->soc->bias_get(hw, desc, 1, &ret);
                        if (err)
                                return err;
                } else {
                        return -ENOTSUPP;
                }
                break;
        case PIN_CONFIG_BIAS_PULL_DOWN:
                if (hw->soc->bias_get_combo) {
                        err = hw->soc->bias_get_combo(hw, desc, &pullup, &ret);
                        if (err)
                                return err;
                        if (ret == MTK_PUPD_SET_R1R0_00 || ret == MTK_DISABLE)
                                return -EINVAL;
                        if (pullup)
                                return -EINVAL;
                } else if (hw->soc->bias_get) {
                        err = hw->soc->bias_get(hw, desc, 0, &ret);
                        if (err)
                                return err;
                } else {
                        return -ENOTSUPP;
                }
                break;
        case PIN_CONFIG_SLEW_RATE:
                err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_SR, &val);
                if (err)
                        return err;

                if (!val)
                        return -EINVAL;

                break;
        case PIN_CONFIG_INPUT_ENABLE:
        case PIN_CONFIG_OUTPUT_ENABLE:
                err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DIR, &val);
                if (err)
                        return err;

                /* HW takes input mode as zero; output mode as non-zero */
                if ((val && param == PIN_CONFIG_INPUT_ENABLE) ||
                    (!val && param == PIN_CONFIG_OUTPUT_ENABLE))
                        return -EINVAL;

                break;
        case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
                err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DIR, &val);
                if (err)
                        return err;

                err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_SMT, &val2);
                if (err)
                        return err;

                if (val || !val2)
                        return -EINVAL;

                break;
        case PIN_CONFIG_DRIVE_STRENGTH:
                if (hw->soc->drive_get) {
                        err = hw->soc->drive_get(hw, desc, &ret);
                        if (err)
                                return err;
                } else {
                        err = -ENOTSUPP;
                }
                break;
        case MTK_PIN_CONFIG_TDSEL:
        case MTK_PIN_CONFIG_RDSEL:
                reg = (param == MTK_PIN_CONFIG_TDSEL) ?
                       PINCTRL_PIN_REG_TDSEL : PINCTRL_PIN_REG_RDSEL;

                err = mtk_hw_get_value(hw, desc, reg, &val);
                if (err)
                        return err;

                ret = val;

                break;
        case MTK_PIN_CONFIG_PU_ADV:
        case MTK_PIN_CONFIG_PD_ADV:
                if (hw->soc->adv_pull_get) {
                        bool pullup;

                        pullup = param == MTK_PIN_CONFIG_PU_ADV;
                        err = hw->soc->adv_pull_get(hw, desc, pullup, &ret);
                        if (err)
                                return err;
                } else {
                        return -ENOTSUPP;
                }
                break;
        default:
                return -ENOTSUPP;
        }

        *config = pinconf_to_config_packed(param, ret);

        return 0;
}

static int mtk_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
                           unsigned long *configs, unsigned int num_configs)
{
        struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
        const struct mtk_pin_desc *desc;
        u32 reg, param, arg;
        int cfg, err = 0;

        desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin];
        if (!desc->name)
                return -ENOTSUPP;

        for (cfg = 0; cfg < num_configs; cfg++) {
                param = pinconf_to_config_param(configs[cfg]);
                arg = pinconf_to_config_argument(configs[cfg]);

                switch (param) {
                case PIN_CONFIG_BIAS_DISABLE:
                        if (hw->soc->bias_set_combo) {
                                err = hw->soc->bias_set_combo(hw, desc, 0, MTK_DISABLE);
                                if (err)
                                        return err;
                        } else if (hw->soc->bias_disable_set) {
                                err = hw->soc->bias_disable_set(hw, desc);
                                if (err)
                                        return err;
                        } else {
                                return -ENOTSUPP;
                        }
                        break;
                case PIN_CONFIG_BIAS_PULL_UP:
                        if (hw->soc->bias_set_combo) {
                                err = hw->soc->bias_set_combo(hw, desc, 1, arg);
                                if (err)
                                        return err;
                        } else if (hw->soc->bias_set) {
                                err = hw->soc->bias_set(hw, desc, 1);
                                if (err)
                                        return err;
                        } else {
                                return -ENOTSUPP;
                        }
                        break;
                case PIN_CONFIG_BIAS_PULL_DOWN:
                        if (hw->soc->bias_set_combo) {
                                err = hw->soc->bias_set_combo(hw, desc, 0, arg);
                                if (err)
                                        return err;
                        } else if (hw->soc->bias_set) {
                                err = hw->soc->bias_set(hw, desc, 0);
                                if (err)
                                        return err;
                        } else {
                                return -ENOTSUPP;
                        }
                        break;
                case PIN_CONFIG_OUTPUT_ENABLE:
                        err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SMT,
                                               MTK_DISABLE);
                        if (err)
                                goto err;

                        err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR,
                                               MTK_OUTPUT);
                        if (err)
                                goto err;
                        break;
                case PIN_CONFIG_INPUT_ENABLE:

                        if (hw->soc->ies_present) {
                                mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_IES,
                                                 MTK_ENABLE);
                        }

                        err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR,
                                               MTK_INPUT);
                        if (err)
                                goto err;
                        break;
                case PIN_CONFIG_SLEW_RATE:
                        err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SR,
                                               arg);
                        if (err)
                                goto err;

                        break;
                case PIN_CONFIG_LEVEL:
                        err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR,
                                               MTK_OUTPUT);
                        if (err)
                                goto err;

                        err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DO,
                                               arg);
                        if (err)
                                goto err;
                        break;
                case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
                        /* arg = 1: Input mode & SMT enable ;
                         * arg = 0: Output mode & SMT disable
                         */
                        arg = arg ? 2 : 1;
                        err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR,
                                               arg & 1);
                        if (err)
                                goto err;

                        err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SMT,
                                               !!(arg & 2));
                        if (err)
                                goto err;
                        break;
                case PIN_CONFIG_DRIVE_STRENGTH:
                        if (hw->soc->drive_set) {
                                err = hw->soc->drive_set(hw, desc, arg);
                                if (err)
                                        return err;
                        } else {
                                err = -ENOTSUPP;
                        }
                        break;
                case MTK_PIN_CONFIG_TDSEL:
                case MTK_PIN_CONFIG_RDSEL:
                        reg = (param == MTK_PIN_CONFIG_TDSEL) ?
                               PINCTRL_PIN_REG_TDSEL : PINCTRL_PIN_REG_RDSEL;

                        err = mtk_hw_set_value(hw, desc, reg, arg);
                        if (err)
                                goto err;
                        break;
                case MTK_PIN_CONFIG_PU_ADV:
                case MTK_PIN_CONFIG_PD_ADV:
                        if (hw->soc->adv_pull_set) {
                                bool pullup;

                                pullup = param == MTK_PIN_CONFIG_PU_ADV;
                                err = hw->soc->adv_pull_set(hw, desc, pullup,
                                                            arg);
                                if (err)
                                        return err;
                        } else {
                                return -ENOTSUPP;
                        }
                        break;
                default:
                        err = -ENOTSUPP;
                }
        }
err:
        return err;
}

static int mtk_pinconf_group_get(struct pinctrl_dev *pctldev,
                                 unsigned int group, unsigned long *config)
{
        const unsigned int *pins;
        unsigned int i, npins;
        unsigned long old = 0;
        int ret;

        ret = pinctrl_generic_get_group_pins(pctldev, group, &pins, &npins);
        if (ret)
                return ret;

        for (i = 0; i < npins; i++) {
                if (mtk_pinconf_get(pctldev, pins[i], config))
                        return -ENOTSUPP;

                /* configs do not match between two pins */
                if (i && old != *config)
                        return -ENOTSUPP;

                old = *config;
        }

        return 0;
}

static int mtk_pinconf_group_set(struct pinctrl_dev *pctldev,
                                 unsigned int group, unsigned long *configs,
                                 unsigned int num_configs)
{
        const unsigned int *pins;
        unsigned int i, npins;
        int ret;

        ret = pinctrl_generic_get_group_pins(pctldev, group, &pins, &npins);
        if (ret)
                return ret;

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

        return 0;
}

static const struct pinctrl_ops mtk_pctlops = {
        .get_groups_count = pinctrl_generic_get_group_count,
        .get_group_name = pinctrl_generic_get_group_name,
        .get_group_pins = pinctrl_generic_get_group_pins,
        .dt_node_to_map = pinconf_generic_dt_node_to_map_all,
        .dt_free_map = pinconf_generic_dt_free_map,
};

static const struct pinmux_ops mtk_pmxops = {
        .get_functions_count = pinmux_generic_get_function_count,
        .get_function_name = pinmux_generic_get_function_name,
        .get_function_groups = pinmux_generic_get_function_groups,
        .set_mux = mtk_pinmux_set_mux,
        .gpio_request_enable = mtk_pinmux_gpio_request_enable,
        .gpio_set_direction = mtk_pinmux_gpio_set_direction,
        .strict = true,
};

static const struct pinconf_ops mtk_confops = {
        .is_generic = true,
        .pin_config_get = mtk_pinconf_get,
        .pin_config_set = mtk_pinconf_set,
        .pin_config_group_get = mtk_pinconf_group_get,
        .pin_config_group_set = mtk_pinconf_group_set,
        .pin_config_config_dbg_show = pinconf_generic_dump_config,
};

static struct pinctrl_desc mtk_desc = {
        .name = PINCTRL_PINCTRL_DEV,
        .pctlops = &mtk_pctlops,
        .pmxops = &mtk_pmxops,
        .confops = &mtk_confops,
        .owner = THIS_MODULE,
};

static int mtk_gpio_get(struct gpio_chip *chip, unsigned int gpio)
{
        struct mtk_pinctrl *hw = gpiochip_get_data(chip);
        const struct mtk_pin_desc *desc;
        int value, err;

        desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio];
        if (!desc->name)
                return -ENOTSUPP;

        err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DI, &value);
        if (err)
                return err;

        return !!value;
}

static int mtk_gpio_set(struct gpio_chip *chip, unsigned int gpio, int value)
{
        struct mtk_pinctrl *hw = gpiochip_get_data(chip);
        const struct mtk_pin_desc *desc;

        desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio];
        if (!desc->name)
                return -ENOTSUPP;

        return mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DO, !!value);
}

static int mtk_gpio_direction_output(struct gpio_chip *chip, unsigned int gpio,
                                     int value)
{
        int ret;

        ret = mtk_gpio_set(chip, gpio, value);
        if (ret)
                return ret;

        return pinctrl_gpio_direction_output(chip, gpio);
}

static int mtk_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
{
        struct mtk_pinctrl *hw = gpiochip_get_data(chip);
        const struct mtk_pin_desc *desc;
        int ret, dir;

        desc = (const struct mtk_pin_desc *)&hw->soc->pins[offset];
        if (!desc->name)
                return -ENOTSUPP;

        ret = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DIR, &dir);
        if (ret)
                return ret;

        return dir ? GPIO_LINE_DIRECTION_OUT : GPIO_LINE_DIRECTION_IN;
}

static int mtk_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
{
        struct mtk_pinctrl *hw = gpiochip_get_data(chip);
        const struct mtk_pin_desc *desc;

        if (!hw->eint)
                return -ENOTSUPP;

        desc = (const struct mtk_pin_desc *)&hw->soc->pins[offset];

        if (desc->eint.eint_n == (u16)EINT_NA)
                return -ENOTSUPP;

        return mtk_eint_find_irq(hw->eint, desc->eint.eint_n);
}

static int mtk_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
                               unsigned long config)
{
        struct mtk_pinctrl *hw = gpiochip_get_data(chip);
        const struct mtk_pin_desc *desc;
        u32 debounce;

        desc = (const struct mtk_pin_desc *)&hw->soc->pins[offset];
        if (!desc->name)
                return -ENOTSUPP;

        if (!hw->eint ||
            pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE ||
            desc->eint.eint_n == (u16)EINT_NA)
                return -ENOTSUPP;

        debounce = pinconf_to_config_argument(config);

        return mtk_eint_set_debounce(hw->eint, desc->eint.eint_n, debounce);
}

static int mtk_build_gpiochip(struct mtk_pinctrl *hw)
{
        struct gpio_chip *chip = &hw->chip;
        int ret;

        chip->label             = PINCTRL_PINCTRL_DEV;
        chip->parent            = hw->dev;
        chip->request           = gpiochip_generic_request;
        chip->free              = gpiochip_generic_free;
        chip->get_direction     = mtk_gpio_get_direction;
        chip->direction_input   = pinctrl_gpio_direction_input;
        chip->direction_output  = mtk_gpio_direction_output;
        chip->get               = mtk_gpio_get;
        chip->set               = mtk_gpio_set;
        chip->to_irq            = mtk_gpio_to_irq;
        chip->set_config        = mtk_gpio_set_config;
        chip->base              = -1;
        chip->ngpio             = hw->soc->npins;

        ret = gpiochip_add_data(chip, hw);
        if (ret < 0)
                return ret;

        /* Just for backward compatible for these old pinctrl nodes without
         * "gpio-ranges" property. Otherwise, called directly from a
         * DeviceTree-supported pinctrl driver is DEPRECATED.
         * Please see Section 2.1 of
         * Documentation/devicetree/bindings/gpio/gpio.txt on how to
         * bind pinctrl and gpio drivers via the "gpio-ranges" property.
         */
        if (!of_property_present(hw->dev->of_node, "gpio-ranges")) {
                ret = gpiochip_add_pin_range(chip, dev_name(hw->dev), 0, 0,
                                             chip->ngpio);
                if (ret < 0) {
                        gpiochip_remove(chip);
                        return ret;
                }
        }

        return 0;
}

static int mtk_build_groups(struct mtk_pinctrl *hw)
{
        int err, i;

        for (i = 0; i < hw->soc->ngrps; i++) {
                const struct group_desc *group = hw->soc->grps + i;
                const struct pingroup *grp = &group->grp;

                err = pinctrl_generic_add_group(hw->pctrl, grp->name, grp->pins, grp->npins,
                                                group->data);
                if (err < 0) {
                        dev_err(hw->dev, "Failed to register group %s\n", grp->name);
                        return err;
                }
        }

        return 0;
}

static int mtk_build_functions(struct mtk_pinctrl *hw)
{
        int i, err;

        for (i = 0; i < hw->soc->nfuncs ; i++) {
                const struct pinfunction *func = hw->soc->funcs + i;

                err = pinmux_generic_add_pinfunction(hw->pctrl, func, NULL);
                if (err < 0) {
                        dev_err(hw->dev, "Failed to register function %s\n",
                                func->name);
                        return err;
                }
        }

        return 0;
}

int mtk_moore_pinctrl_probe(struct platform_device *pdev,
                            const struct mtk_pin_soc *soc)
{
        struct device *dev = &pdev->dev;
        struct pinctrl_pin_desc *pins;
        struct mtk_pinctrl *hw;
        int err, i;

        hw = devm_kzalloc(&pdev->dev, sizeof(*hw), GFP_KERNEL);
        if (!hw)
                return -ENOMEM;

        hw->soc = soc;
        hw->dev = &pdev->dev;

        if (!hw->soc->nbase_names)
                return dev_err_probe(dev, -EINVAL,
                        "SoC should be assigned at least one register base\n");

        hw->base = devm_kmalloc_array(&pdev->dev, hw->soc->nbase_names,
                                      sizeof(*hw->base), GFP_KERNEL);
        if (!hw->base)
                return -ENOMEM;

        for (i = 0; i < hw->soc->nbase_names; i++) {
                hw->base[i] = devm_platform_ioremap_resource_byname(pdev,
                                                hw->soc->base_names[i]);
                if (IS_ERR(hw->base[i]))
                        return PTR_ERR(hw->base[i]);
        }

        hw->nbase = hw->soc->nbase_names;

        spin_lock_init(&hw->lock);

        /* Copy from internal struct mtk_pin_desc to register to the core */
        pins = devm_kmalloc_array(&pdev->dev, hw->soc->npins, sizeof(*pins),
                                  GFP_KERNEL);
        if (!pins)
                return -ENOMEM;

        for (i = 0; i < hw->soc->npins; i++) {
                pins[i].number = hw->soc->pins[i].number;
                pins[i].name = hw->soc->pins[i].name;
        }

        /* Setup pins descriptions per SoC types */
        mtk_desc.pins = (const struct pinctrl_pin_desc *)pins;
        mtk_desc.npins = hw->soc->npins;
        mtk_desc.num_custom_params = ARRAY_SIZE(mtk_custom_bindings);
        mtk_desc.custom_params = mtk_custom_bindings;
#ifdef CONFIG_DEBUG_FS
        mtk_desc.custom_conf_items = mtk_conf_items;
#endif

        err = devm_pinctrl_register_and_init(&pdev->dev, &mtk_desc, hw,
                                             &hw->pctrl);
        if (err)
                return err;

        /* Setup groups descriptions per SoC types */
        err = mtk_build_groups(hw);
        if (err)
                return dev_err_probe(dev, err, "Failed to build groups\n");

        /* Setup functions descriptions per SoC types */
        err = mtk_build_functions(hw);
        if (err)
                return dev_err_probe(dev, err, "Failed to build functions\n");

        /* For able to make pinctrl_claim_hogs, we must not enable pinctrl
         * until all groups and functions are being added one.
         */
        err = pinctrl_enable(hw->pctrl);
        if (err)
                return err;

        err = mtk_build_eint(hw, pdev);
        if (err)
                dev_warn(&pdev->dev,
                         "Failed to add EINT, but pinctrl still can work\n");

        /* Build gpiochip should be after pinctrl_enable is done */
        err = mtk_build_gpiochip(hw);
        if (err)
                return dev_err_probe(dev, err, "Failed to add gpio_chip\n");

        platform_set_drvdata(pdev, hw);

        return 0;
}