pinctrl-single.c

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/*
 * Generic device tree based pinctrl driver for one register per pin
 * type pinmux controllers
 *
 * Copyright (C) 2012 Texas Instruments, Inc.
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2. This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/list.h>

#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_address.h>

#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>

#include "core.h"

#define DRIVER_NAME         "pinctrl-single"
#define PCS_MUX_PINS_NAME       "pinctrl-single,pins"
#define PCS_MUX_BITS_NAME       "pinctrl-single,bits"
#define PCS_REG_NAME_LEN        ((sizeof(unsigned long) * 2) + 1)
#define PCS_OFF_DISABLED        ~0U

struct pcs_pingroup {
    struct device_node *np;
    const char *name;
    int *gpins;
    int ngpins;
    struct list_head node;
};

struct pcs_func_vals {
    void __iomem *reg;
    unsigned val;
    unsigned mask;
};

struct pcs_function {
    const char *name;
    struct pcs_func_vals *vals;
    unsigned nvals;
    const char **pgnames;
    int npgnames;
    struct list_head node;
};

struct pcs_data {
    struct pinctrl_pin_desc *pa;
    int cur;
};

struct pcs_name {
    char name[PCS_REG_NAME_LEN];
};

struct pcs_device {
    struct resource *res;
    void __iomem *base;
    unsigned size;
    struct device *dev;
    struct pinctrl_dev *pctl;
    struct mutex mutex;
    unsigned width;
    unsigned fmask;
    unsigned fshift;
    unsigned foff;
    unsigned fmax;
    bool bits_per_mux;
    struct pcs_name *names;
    struct pcs_data pins;
    struct radix_tree_root pgtree;
    struct radix_tree_root ftree;
    struct list_head pingroups;
    struct list_head functions;
    unsigned ngroups;
    unsigned nfuncs;
    struct pinctrl_desc desc;
    unsigned (*read)(void __iomem *reg);
    void (*write)(unsigned val, void __iomem *reg);
};

/*
 * REVISIT: Reads and writes could eventually use regmap or something
 * generic. But at least on omaps, some mux registers are performance
 * critical as they may need to be remuxed every time before and after
 * idle. Adding tests for register access width for every read and
 * write like regmap is doing is not desired, and caching the registers
 * does not help in this case.
 */

static unsigned __maybe_unused pcs_readb(void __iomem *reg)
{
    return readb(reg);
}

static unsigned __maybe_unused pcs_readw(void __iomem *reg)
{
    return readw(reg);
}

static unsigned __maybe_unused pcs_readl(void __iomem *reg)
{
    return readl(reg);
}

static void __maybe_unused pcs_writeb(unsigned val, void __iomem *reg)
{
    writeb(val, reg);
}

static void __maybe_unused pcs_writew(unsigned val, void __iomem *reg)
{
    writew(val, reg);
}

static void __maybe_unused pcs_writel(unsigned val, void __iomem *reg)
{
    writel(val, reg);
}

static int pcs_get_groups_count(struct pinctrl_dev *pctldev)
{
    struct pcs_device *pcs;

    pcs = pinctrl_dev_get_drvdata(pctldev);

    return pcs->ngroups;
}

static const char *pcs_get_group_name(struct pinctrl_dev *pctldev,
                    unsigned gselector)
{
    struct pcs_device *pcs;
    struct pcs_pingroup *group;

    pcs = pinctrl_dev_get_drvdata(pctldev);
    group = radix_tree_lookup(&pcs->pgtree, gselector);
    if (!group) {
        dev_err(pcs->dev, "%s could not find pingroup%i\n",
            __func__, gselector);
        return NULL;
    }

    return group->name;
}

static int pcs_get_group_pins(struct pinctrl_dev *pctldev,
                    unsigned gselector,
                    const unsigned **pins,
                    unsigned *npins)
{
    struct pcs_device *pcs;
    struct pcs_pingroup *group;

    pcs = pinctrl_dev_get_drvdata(pctldev);
    group = radix_tree_lookup(&pcs->pgtree, gselector);
    if (!group) {
        dev_err(pcs->dev, "%s could not find pingroup%i\n",
            __func__, gselector);
        return -EINVAL;
    }

    *pins = group->gpins;
    *npins = group->ngpins;

    return 0;
}

static void pcs_pin_dbg_show(struct pinctrl_dev *pctldev,
                    struct seq_file *s,
                    unsigned offset)
{
    struct pcs_device *pcs;
    unsigned val;

    pcs = pinctrl_dev_get_drvdata(pctldev);

    val = pcs->read(pcs->base + offset);
    val &= pcs->fmask;

    seq_printf(s, "%08x %s " , val, DRIVER_NAME);
}

static void pcs_dt_free_map(struct pinctrl_dev *pctldev,
                struct pinctrl_map *map, unsigned num_maps)
{
    struct pcs_device *pcs;

    pcs = pinctrl_dev_get_drvdata(pctldev);
    devm_kfree(pcs->dev, map);
}

static int pcs_dt_node_to_map(struct pinctrl_dev *pctldev,
                struct device_node *np_config,
                struct pinctrl_map **map, unsigned *num_maps);

static struct pinctrl_ops pcs_pinctrl_ops = {
    .get_groups_count = pcs_get_groups_count,
    .get_group_name = pcs_get_group_name,
    .get_group_pins = pcs_get_group_pins,
    .pin_dbg_show = pcs_pin_dbg_show,
    .dt_node_to_map = pcs_dt_node_to_map,
    .dt_free_map = pcs_dt_free_map,
};

static int pcs_get_functions_count(struct pinctrl_dev *pctldev)
{
    struct pcs_device *pcs;

    pcs = pinctrl_dev_get_drvdata(pctldev);

    return pcs->nfuncs;
}

static const char *pcs_get_function_name(struct pinctrl_dev *pctldev,
                        unsigned fselector)
{
    struct pcs_device *pcs;
    struct pcs_function *func;

    pcs = pinctrl_dev_get_drvdata(pctldev);
    func = radix_tree_lookup(&pcs->ftree, fselector);
    if (!func) {
        dev_err(pcs->dev, "%s could not find function%i\n",
            __func__, fselector);
        return NULL;
    }

    return func->name;
}

static int pcs_get_function_groups(struct pinctrl_dev *pctldev,
                    unsigned fselector,
                    const char * const **groups,
                    unsigned * const ngroups)
{
    struct pcs_device *pcs;
    struct pcs_function *func;

    pcs = pinctrl_dev_get_drvdata(pctldev);
    func = radix_tree_lookup(&pcs->ftree, fselector);
    if (!func) {
        dev_err(pcs->dev, "%s could not find function%i\n",
            __func__, fselector);
        return -EINVAL;
    }
    *groups = func->pgnames;
    *ngroups = func->npgnames;

    return 0;
}

static int pcs_enable(struct pinctrl_dev *pctldev, unsigned fselector,
    unsigned group)
{
    struct pcs_device *pcs;
    struct pcs_function *func;
    int i;

    pcs = pinctrl_dev_get_drvdata(pctldev);
    func = radix_tree_lookup(&pcs->ftree, fselector);
    if (!func)
        return -EINVAL;

    dev_dbg(pcs->dev, "enabling %s function%i\n",
        func->name, fselector);

    for (i = 0; i < func->nvals; i++) {
        struct pcs_func_vals *vals;
        unsigned val, mask;

        vals = &func->vals[i];
        val = pcs->read(vals->reg);
        if (!vals->mask)
            mask = pcs->fmask;
        else
            mask = pcs->fmask & vals->mask;

        val &= ~mask;
        val |= (vals->val & mask);
        pcs->write(val, vals->reg);
    }

    return 0;
}

static void pcs_disable(struct pinctrl_dev *pctldev, unsigned fselector,
                    unsigned group)
{
    struct pcs_device *pcs;
    struct pcs_function *func;
    int i;

    pcs = pinctrl_dev_get_drvdata(pctldev);
    func = radix_tree_lookup(&pcs->ftree, fselector);
    if (!func) {
        dev_err(pcs->dev, "%s could not find function%i\n",
            __func__, fselector);
        return;
    }

    /*
     * Ignore disable if function-off is not specified. Some hardware
     * does not have clearly defined disable function. For pin specific
     * off modes, you can use alternate named states as described in
     * pinctrl-bindings.txt.
     */
    if (pcs->foff == PCS_OFF_DISABLED) {
        dev_dbg(pcs->dev, "ignoring disable for %s function%i\n",
            func->name, fselector);
        return;
    }

    dev_dbg(pcs->dev, "disabling function%i %s\n",
        fselector, func->name);

    for (i = 0; i < func->nvals; i++) {
        struct pcs_func_vals *vals;
        unsigned val;

        vals = &func->vals[i];
        val = pcs->read(vals->reg);
        val &= ~pcs->fmask;
        val |= pcs->foff << pcs->fshift;
        pcs->write(val, vals->reg);
    }
}

static int pcs_request_gpio(struct pinctrl_dev *pctldev,
            struct pinctrl_gpio_range *range, unsigned offset)
{
    return -ENOTSUPP;
}

static struct pinmux_ops pcs_pinmux_ops = {
    .get_functions_count = pcs_get_functions_count,
    .get_function_name = pcs_get_function_name,
    .get_function_groups = pcs_get_function_groups,
    .enable = pcs_enable,
    .disable = pcs_disable,
    .gpio_request_enable = pcs_request_gpio,
};

static int pcs_pinconf_get(struct pinctrl_dev *pctldev,
                unsigned pin, unsigned long *config)
{
    return -ENOTSUPP;
}

static int pcs_pinconf_set(struct pinctrl_dev *pctldev,
                unsigned pin, unsigned long config)
{
    return -ENOTSUPP;
}

static int pcs_pinconf_group_get(struct pinctrl_dev *pctldev,
                unsigned group, unsigned long *config)
{
    return -ENOTSUPP;
}

static int pcs_pinconf_group_set(struct pinctrl_dev *pctldev,
                unsigned group, unsigned long config)
{
    return -ENOTSUPP;
}

static void pcs_pinconf_dbg_show(struct pinctrl_dev *pctldev,
                struct seq_file *s, unsigned offset)
{
}

static void pcs_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
                struct seq_file *s, unsigned selector)
{
}

static struct pinconf_ops pcs_pinconf_ops = {
    .pin_config_get = pcs_pinconf_get,
    .pin_config_set = pcs_pinconf_set,
    .pin_config_group_get = pcs_pinconf_group_get,
    .pin_config_group_set = pcs_pinconf_group_set,
    .pin_config_dbg_show = pcs_pinconf_dbg_show,
    .pin_config_group_dbg_show = pcs_pinconf_group_dbg_show,
};

static int __devinit pcs_add_pin(struct pcs_device *pcs, unsigned offset)
{
    struct pinctrl_pin_desc *pin;
    struct pcs_name *pn;
    int i;

    i = pcs->pins.cur;
    if (i >= pcs->desc.npins) {
        dev_err(pcs->dev, "too many pins, max %i\n",
            pcs->desc.npins);
        return -ENOMEM;
    }

    pin = &pcs->pins.pa[i];
    pn = &pcs->names[i];
    sprintf(pn->name, "%lx",
        (unsigned long)pcs->res->start + offset);
    pin->name = pn->name;
    pin->number = i;
    pcs->pins.cur++;

    return i;
}

static int __devinit pcs_allocate_pin_table(struct pcs_device *pcs)
{
    int mux_bytes, nr_pins, i;

    mux_bytes = pcs->width / BITS_PER_BYTE;
    nr_pins = pcs->size / mux_bytes;

    dev_dbg(pcs->dev, "allocating %i pins\n", nr_pins);
    pcs->pins.pa = devm_kzalloc(pcs->dev,
                sizeof(*pcs->pins.pa) * nr_pins,
                GFP_KERNEL);
    if (!pcs->pins.pa)
        return -ENOMEM;

    pcs->names = devm_kzalloc(pcs->dev,
                sizeof(struct pcs_name) * nr_pins,
                GFP_KERNEL);
    if (!pcs->names)
        return -ENOMEM;

    pcs->desc.pins = pcs->pins.pa;
    pcs->desc.npins = nr_pins;

    for (i = 0; i < pcs->desc.npins; i++) {
        unsigned offset;
        int res;

        offset = i * mux_bytes;
        res = pcs_add_pin(pcs, offset);
        if (res < 0) {
            dev_err(pcs->dev, "error adding pins: %i\n", res);
            return res;
        }
    }

    return 0;
}

static struct pcs_function *pcs_add_function(struct pcs_device *pcs,
                    struct device_node *np,
                    const char *name,
                    struct pcs_func_vals *vals,
                    unsigned nvals,
                    const char **pgnames,
                    unsigned npgnames)
{
    struct pcs_function *function;

    function = devm_kzalloc(pcs->dev, sizeof(*function), GFP_KERNEL);
    if (!function)
        return NULL;

    function->name = name;
    function->vals = vals;
    function->nvals = nvals;
    function->pgnames = pgnames;
    function->npgnames = npgnames;

    mutex_lock(&pcs->mutex);
    list_add_tail(&function->node, &pcs->functions);
    radix_tree_insert(&pcs->ftree, pcs->nfuncs, function);
    pcs->nfuncs++;
    mutex_unlock(&pcs->mutex);

    return function;
}

static void pcs_remove_function(struct pcs_device *pcs,
                struct pcs_function *function)
{
    int i;

    mutex_lock(&pcs->mutex);
    for (i = 0; i < pcs->nfuncs; i++) {
        struct pcs_function *found;

        found = radix_tree_lookup(&pcs->ftree, i);
        if (found == function)
            radix_tree_delete(&pcs->ftree, i);
    }
    list_del(&function->node);
    mutex_unlock(&pcs->mutex);
}

static int pcs_add_pingroup(struct pcs_device *pcs,
                    struct device_node *np,
                    const char *name,
                    int *gpins,
                    int ngpins)
{
    struct pcs_pingroup *pingroup;

    pingroup = devm_kzalloc(pcs->dev, sizeof(*pingroup), GFP_KERNEL);
    if (!pingroup)
        return -ENOMEM;

    pingroup->name = name;
    pingroup->np = np;
    pingroup->gpins = gpins;
    pingroup->ngpins = ngpins;

    mutex_lock(&pcs->mutex);
    list_add_tail(&pingroup->node, &pcs->pingroups);
    radix_tree_insert(&pcs->pgtree, pcs->ngroups, pingroup);
    pcs->ngroups++;
    mutex_unlock(&pcs->mutex);

    return 0;
}

static int pcs_get_pin_by_offset(struct pcs_device *pcs, unsigned offset)
{
    unsigned index;

    if (offset >= pcs->size) {
        dev_err(pcs->dev, "mux offset out of range: 0x%x (0x%x)\n",
            offset, pcs->size);
        return -EINVAL;
    }

    index = offset / (pcs->width / BITS_PER_BYTE);

    return index;
}

static int pcs_parse_one_pinctrl_entry(struct pcs_device *pcs,
                        struct device_node *np,
                        struct pinctrl_map **map,
                        const char **pgnames)
{
    struct pcs_func_vals *vals;
    const __be32 *mux;
    int size, params, rows, *pins, index = 0, found = 0, res = -ENOMEM;
    struct pcs_function *function;

    if (pcs->bits_per_mux) {
        params = 3;
        mux = of_get_property(np, PCS_MUX_BITS_NAME, &size);
    } else {
        params = 2;
        mux = of_get_property(np, PCS_MUX_PINS_NAME, &size);
    }

    if (!mux) {
        dev_err(pcs->dev, "no valid property for %s\n", np->name);
        return -EINVAL;
    }

    if (size < (sizeof(*mux) * params)) {
        dev_err(pcs->dev, "bad data for %s\n", np->name);
        return -EINVAL;
    }

    size /= sizeof(*mux);   /* Number of elements in array */
    rows = size / params;

    vals = devm_kzalloc(pcs->dev, sizeof(*vals) * rows, GFP_KERNEL);
    if (!vals)
        return -ENOMEM;

    pins = devm_kzalloc(pcs->dev, sizeof(*pins) * rows, GFP_KERNEL);
    if (!pins)
        goto free_vals;

    while (index < size) {
        unsigned offset, val;
        int pin;

        offset = be32_to_cpup(mux + index++);
        val = be32_to_cpup(mux + index++);
        vals[found].reg = pcs->base + offset;
        vals[found].val = val;
        if (params == 3) {
            val = be32_to_cpup(mux + index++);
            vals[found].mask = val;
        }

        pin = pcs_get_pin_by_offset(pcs, offset);
        if (pin < 0) {
            dev_err(pcs->dev,
                "could not add functions for %s %ux\n",
                np->name, offset);
            break;
        }
        pins[found++] = pin;
    }

    pgnames[0] = np->name;
    function = pcs_add_function(pcs, np, np->name, vals, found, pgnames, 1);
    if (!function)
        goto free_pins;

    res = pcs_add_pingroup(pcs, np, np->name, pins, found);
    if (res < 0)
        goto free_function;

    (*map)->type = PIN_MAP_TYPE_MUX_GROUP;
    (*map)->data.mux.group = np->name;
    (*map)->data.mux.function = np->name;

    return 0;

free_function:
    pcs_remove_function(pcs, function);

free_pins:
    devm_kfree(pcs->dev, pins);

free_vals:
    devm_kfree(pcs->dev, vals);

    return res;
}
static int pcs_dt_node_to_map(struct pinctrl_dev *pctldev,
                struct device_node *np_config,
                struct pinctrl_map **map, unsigned *num_maps)
{
    struct pcs_device *pcs;
    const char **pgnames;
    int ret;

    pcs = pinctrl_dev_get_drvdata(pctldev);

    *map = devm_kzalloc(pcs->dev, sizeof(**map), GFP_KERNEL);
    if (!map)
        return -ENOMEM;

    *num_maps = 0;

    pgnames = devm_kzalloc(pcs->dev, sizeof(*pgnames), GFP_KERNEL);
    if (!pgnames) {
        ret = -ENOMEM;
        goto free_map;
    }

    ret = pcs_parse_one_pinctrl_entry(pcs, np_config, map, pgnames);
    if (ret < 0) {
        dev_err(pcs->dev, "no pins entries for %s\n",
            np_config->name);
        goto free_pgnames;
    }
    *num_maps = 1;

    return 0;

free_pgnames:
    devm_kfree(pcs->dev, pgnames);
free_map:
    devm_kfree(pcs->dev, *map);

    return ret;
}

static void pcs_free_funcs(struct pcs_device *pcs)
{
    struct list_head *pos, *tmp;
    int i;

    mutex_lock(&pcs->mutex);
    for (i = 0; i < pcs->nfuncs; i++) {
        struct pcs_function *func;

        func = radix_tree_lookup(&pcs->ftree, i);
        if (!func)
            continue;
        radix_tree_delete(&pcs->ftree, i);
    }
    list_for_each_safe(pos, tmp, &pcs->functions) {
        struct pcs_function *function;

        function = list_entry(pos, struct pcs_function, node);
        list_del(&function->node);
    }
    mutex_unlock(&pcs->mutex);
}

static void pcs_free_pingroups(struct pcs_device *pcs)
{
    struct list_head *pos, *tmp;
    int i;

    mutex_lock(&pcs->mutex);
    for (i = 0; i < pcs->ngroups; i++) {
        struct pcs_pingroup *pingroup;

        pingroup = radix_tree_lookup(&pcs->pgtree, i);
        if (!pingroup)
            continue;
        radix_tree_delete(&pcs->pgtree, i);
    }
    list_for_each_safe(pos, tmp, &pcs->pingroups) {
        struct pcs_pingroup *pingroup;

        pingroup = list_entry(pos, struct pcs_pingroup, node);
        list_del(&pingroup->node);
    }
    mutex_unlock(&pcs->mutex);
}

static void pcs_free_resources(struct pcs_device *pcs)
{
    if (pcs->pctl)
        pinctrl_unregister(pcs->pctl);

    pcs_free_funcs(pcs);
    pcs_free_pingroups(pcs);
}

#define PCS_GET_PROP_U32(name, reg, err)                \
    do {                                \
        ret = of_property_read_u32(np, name, reg);      \
        if (ret) {                      \
            dev_err(pcs->dev, err);             \
            return ret;                 \
        }                           \
    } while (0);

static struct of_device_id pcs_of_match[];

static int __devinit pcs_probe(struct platform_device *pdev)
{
    struct device_node *np = pdev->dev.of_node;
    const struct of_device_id *match;
    struct resource *res;
    struct pcs_device *pcs;
    int ret;

    match = of_match_device(pcs_of_match, &pdev->dev);
    if (!match)
        return -EINVAL;

    pcs = devm_kzalloc(&pdev->dev, sizeof(*pcs), GFP_KERNEL);
    if (!pcs) {
        dev_err(&pdev->dev, "could not allocate\n");
        return -ENOMEM;
    }
    pcs->dev = &pdev->dev;
    mutex_init(&pcs->mutex);
    INIT_LIST_HEAD(&pcs->pingroups);
    INIT_LIST_HEAD(&pcs->functions);

    PCS_GET_PROP_U32("pinctrl-single,register-width", &pcs->width,
             "register width not specified\n");

    PCS_GET_PROP_U32("pinctrl-single,function-mask", &pcs->fmask,
             "function register mask not specified\n");
    pcs->fshift = ffs(pcs->fmask) - 1;
    pcs->fmax = pcs->fmask >> pcs->fshift;

    ret = of_property_read_u32(np, "pinctrl-single,function-off",
                    &pcs->foff);
    if (ret)
        pcs->foff = PCS_OFF_DISABLED;

    pcs->bits_per_mux = of_property_read_bool(np,
                          "pinctrl-single,bit-per-mux");

    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    if (!res) {
        dev_err(pcs->dev, "could not get resource\n");
        return -ENODEV;
    }

    pcs->res = devm_request_mem_region(pcs->dev, res->start,
            resource_size(res), DRIVER_NAME);
    if (!pcs->res) {
        dev_err(pcs->dev, "could not get mem_region\n");
        return -EBUSY;
    }

    pcs->size = resource_size(pcs->res);
    pcs->base = devm_ioremap(pcs->dev, pcs->res->start, pcs->size);
    if (!pcs->base) {
        dev_err(pcs->dev, "could not ioremap\n");
        return -ENODEV;
    }

    INIT_RADIX_TREE(&pcs->pgtree, GFP_KERNEL);
    INIT_RADIX_TREE(&pcs->ftree, GFP_KERNEL);
    platform_set_drvdata(pdev, pcs);

    switch (pcs->width) {
    case 8:
        pcs->read = pcs_readb;
        pcs->write = pcs_writeb;
        break;
    case 16:
        pcs->read = pcs_readw;
        pcs->write = pcs_writew;
        break;
    case 32:
        pcs->read = pcs_readl;
        pcs->write = pcs_writel;
        break;
    default:
        break;
    }

    pcs->desc.name = DRIVER_NAME;
    pcs->desc.pctlops = &pcs_pinctrl_ops;
    pcs->desc.pmxops = &pcs_pinmux_ops;
    pcs->desc.confops = &pcs_pinconf_ops;
    pcs->desc.owner = THIS_MODULE;

    ret = pcs_allocate_pin_table(pcs);
    if (ret < 0)
        goto free;

    pcs->pctl = pinctrl_register(&pcs->desc, pcs->dev, pcs);
    if (!pcs->pctl) {
        dev_err(pcs->dev, "could not register single pinctrl driver\n");
        ret = -EINVAL;
        goto free;
    }

    dev_info(pcs->dev, "%i pins at pa %p size %u\n",
         pcs->desc.npins, pcs->base, pcs->size);

    return 0;

free:
    pcs_free_resources(pcs);

    return ret;
}

static int __devexit pcs_remove(struct platform_device *pdev)
{
    struct pcs_device *pcs = platform_get_drvdata(pdev);

    if (!pcs)
        return 0;

    pcs_free_resources(pcs);

    return 0;
}

static struct of_device_id pcs_of_match[] __devinitdata = {
    { .compatible = DRIVER_NAME, },
    { },
};
MODULE_DEVICE_TABLE(of, pcs_of_match);

static struct platform_driver pcs_driver = {
    .probe      = pcs_probe,
    .remove     = __devexit_p(pcs_remove),
    .driver = {
        .owner      = THIS_MODULE,
        .name       = DRIVER_NAME,
        .of_match_table = pcs_of_match,
    },
};

module_platform_driver(pcs_driver);

MODULE_AUTHOR("Tony Lindgren <[email protected]>");
MODULE_DESCRIPTION("One-register-per-pin type device tree based pinctrl driver");
MODULE_LICENSE("GPL v2");