X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fpinctrl%2Fmvebu%2Fpinctrl-mvebu.c;fp=kernel%2Fdrivers%2Fpinctrl%2Fmvebu%2Fpinctrl-mvebu.c;h=f3b426cdaf8f16116c591a317ba98486824d40eb;hb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;hp=0000000000000000000000000000000000000000;hpb=98260f3884f4a202f9ca5eabed40b1354c489b29;p=kvmfornfv.git

diff --git a/kernel/drivers/pinctrl/mvebu/pinctrl-mvebu.c b/kernel/drivers/pinctrl/mvebu/pinctrl-mvebu.c
new file mode 100644
index 000000000..f3b426cda
--- /dev/null
+++ b/kernel/drivers/pinctrl/mvebu/pinctrl-mvebu.c
@@ -0,0 +1,728 @@
+/*
+ * Marvell MVEBU pinctrl core driver
+ *
+ * Authors: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
+ *          Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+ *
+ * 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/platform_device.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/pinctrl/machine.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+
+#include "pinctrl-mvebu.h"
+
+#define MPPS_PER_REG	8
+#define MPP_BITS	4
+#define MPP_MASK	0xf
+
+struct mvebu_pinctrl_function {
+	const char *name;
+	const char **groups;
+	unsigned num_groups;
+};
+
+struct mvebu_pinctrl_group {
+	const char *name;
+	struct mvebu_mpp_ctrl *ctrl;
+	struct mvebu_mpp_ctrl_setting *settings;
+	unsigned num_settings;
+	unsigned gid;
+	unsigned *pins;
+	unsigned npins;
+};
+
+struct mvebu_pinctrl {
+	struct device *dev;
+	struct pinctrl_dev *pctldev;
+	struct pinctrl_desc desc;
+	struct mvebu_pinctrl_group *groups;
+	unsigned num_groups;
+	struct mvebu_pinctrl_function *functions;
+	unsigned num_functions;
+	u8 variant;
+};
+
+static struct mvebu_pinctrl_group *mvebu_pinctrl_find_group_by_pid(
+	struct mvebu_pinctrl *pctl, unsigned pid)
+{
+	unsigned n;
+	for (n = 0; n < pctl->num_groups; n++) {
+		if (pid >= pctl->groups[n].pins[0] &&
+		    pid < pctl->groups[n].pins[0] +
+			pctl->groups[n].npins)
+			return &pctl->groups[n];
+	}
+	return NULL;
+}
+
+static struct mvebu_pinctrl_group *mvebu_pinctrl_find_group_by_name(
+	struct mvebu_pinctrl *pctl, const char *name)
+{
+	unsigned n;
+	for (n = 0; n < pctl->num_groups; n++) {
+		if (strcmp(name, pctl->groups[n].name) == 0)
+			return &pctl->groups[n];
+	}
+	return NULL;
+}
+
+static struct mvebu_mpp_ctrl_setting *mvebu_pinctrl_find_setting_by_val(
+	struct mvebu_pinctrl *pctl, struct mvebu_pinctrl_group *grp,
+	unsigned long config)
+{
+	unsigned n;
+	for (n = 0; n < grp->num_settings; n++) {
+		if (config == grp->settings[n].val) {
+			if (!pctl->variant || (pctl->variant &
+					       grp->settings[n].variant))
+				return &grp->settings[n];
+		}
+	}
+	return NULL;
+}
+
+static struct mvebu_mpp_ctrl_setting *mvebu_pinctrl_find_setting_by_name(
+	struct mvebu_pinctrl *pctl, struct mvebu_pinctrl_group *grp,
+	const char *name)
+{
+	unsigned n;
+	for (n = 0; n < grp->num_settings; n++) {
+		if (strcmp(name, grp->settings[n].name) == 0) {
+			if (!pctl->variant || (pctl->variant &
+					       grp->settings[n].variant))
+				return &grp->settings[n];
+		}
+	}
+	return NULL;
+}
+
+static struct mvebu_mpp_ctrl_setting *mvebu_pinctrl_find_gpio_setting(
+	struct mvebu_pinctrl *pctl, struct mvebu_pinctrl_group *grp)
+{
+	unsigned n;
+	for (n = 0; n < grp->num_settings; n++) {
+		if (grp->settings[n].flags &
+			(MVEBU_SETTING_GPO | MVEBU_SETTING_GPI)) {
+			if (!pctl->variant || (pctl->variant &
+						grp->settings[n].variant))
+				return &grp->settings[n];
+		}
+	}
+	return NULL;
+}
+
+static struct mvebu_pinctrl_function *mvebu_pinctrl_find_function_by_name(
+	struct mvebu_pinctrl *pctl, const char *name)
+{
+	unsigned n;
+	for (n = 0; n < pctl->num_functions; n++) {
+		if (strcmp(name, pctl->functions[n].name) == 0)
+			return &pctl->functions[n];
+	}
+	return NULL;
+}
+
+static int mvebu_pinconf_group_get(struct pinctrl_dev *pctldev,
+				unsigned gid, unsigned long *config)
+{
+	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
+	struct mvebu_pinctrl_group *grp = &pctl->groups[gid];
+
+	if (!grp->ctrl)
+		return -EINVAL;
+
+	return grp->ctrl->mpp_get(grp->pins[0], config);
+}
+
+static int mvebu_pinconf_group_set(struct pinctrl_dev *pctldev,
+				unsigned gid, unsigned long *configs,
+				unsigned num_configs)
+{
+	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
+	struct mvebu_pinctrl_group *grp = &pctl->groups[gid];
+	int i, ret;
+
+	if (!grp->ctrl)
+		return -EINVAL;
+
+	for (i = 0; i < num_configs; i++) {
+		ret = grp->ctrl->mpp_set(grp->pins[0], configs[i]);
+		if (ret)
+			return ret;
+	} /* for each config */
+
+	return 0;
+}
+
+static void mvebu_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
+					struct seq_file *s, unsigned gid)
+{
+	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
+	struct mvebu_pinctrl_group *grp = &pctl->groups[gid];
+	struct mvebu_mpp_ctrl_setting *curr;
+	unsigned long config;
+	unsigned n;
+
+	if (mvebu_pinconf_group_get(pctldev, gid, &config))
+		return;
+
+	curr = mvebu_pinctrl_find_setting_by_val(pctl, grp, config);
+
+	if (curr) {
+		seq_printf(s, "current: %s", curr->name);
+		if (curr->subname)
+			seq_printf(s, "(%s)", curr->subname);
+		if (curr->flags & (MVEBU_SETTING_GPO | MVEBU_SETTING_GPI)) {
+			seq_printf(s, "(");
+			if (curr->flags & MVEBU_SETTING_GPI)
+				seq_printf(s, "i");
+			if (curr->flags & MVEBU_SETTING_GPO)
+				seq_printf(s, "o");
+			seq_printf(s, ")");
+		}
+	} else
+		seq_printf(s, "current: UNKNOWN");
+
+	if (grp->num_settings > 1) {
+		seq_printf(s, ", available = [");
+		for (n = 0; n < grp->num_settings; n++) {
+			if (curr == &grp->settings[n])
+				continue;
+
+			/* skip unsupported settings for this variant */
+			if (pctl->variant &&
+			    !(pctl->variant & grp->settings[n].variant))
+				continue;
+
+			seq_printf(s, " %s", grp->settings[n].name);
+			if (grp->settings[n].subname)
+				seq_printf(s, "(%s)", grp->settings[n].subname);
+			if (grp->settings[n].flags &
+				(MVEBU_SETTING_GPO | MVEBU_SETTING_GPI)) {
+				seq_printf(s, "(");
+				if (grp->settings[n].flags & MVEBU_SETTING_GPI)
+					seq_printf(s, "i");
+				if (grp->settings[n].flags & MVEBU_SETTING_GPO)
+					seq_printf(s, "o");
+				seq_printf(s, ")");
+			}
+		}
+		seq_printf(s, " ]");
+	}
+	return;
+}
+
+static const struct pinconf_ops mvebu_pinconf_ops = {
+	.pin_config_group_get = mvebu_pinconf_group_get,
+	.pin_config_group_set = mvebu_pinconf_group_set,
+	.pin_config_group_dbg_show = mvebu_pinconf_group_dbg_show,
+};
+
+static int mvebu_pinmux_get_funcs_count(struct pinctrl_dev *pctldev)
+{
+	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
+
+	return pctl->num_functions;
+}
+
+static const char *mvebu_pinmux_get_func_name(struct pinctrl_dev *pctldev,
+					unsigned fid)
+{
+	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
+
+	return pctl->functions[fid].name;
+}
+
+static int mvebu_pinmux_get_groups(struct pinctrl_dev *pctldev, unsigned fid,
+				const char * const **groups,
+				unsigned * const num_groups)
+{
+	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
+
+	*groups = pctl->functions[fid].groups;
+	*num_groups = pctl->functions[fid].num_groups;
+	return 0;
+}
+
+static int mvebu_pinmux_set(struct pinctrl_dev *pctldev, unsigned fid,
+			    unsigned gid)
+{
+	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
+	struct mvebu_pinctrl_function *func = &pctl->functions[fid];
+	struct mvebu_pinctrl_group *grp = &pctl->groups[gid];
+	struct mvebu_mpp_ctrl_setting *setting;
+	int ret;
+	unsigned long config;
+
+	setting = mvebu_pinctrl_find_setting_by_name(pctl, grp,
+						     func->name);
+	if (!setting) {
+		dev_err(pctl->dev,
+			"unable to find setting %s in group %s\n",
+			func->name, func->groups[gid]);
+		return -EINVAL;
+	}
+
+	config = setting->val;
+	ret = mvebu_pinconf_group_set(pctldev, grp->gid, &config, 1);
+	if (ret) {
+		dev_err(pctl->dev, "cannot set group %s to %s\n",
+			func->groups[gid], func->name);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int mvebu_pinmux_gpio_request_enable(struct pinctrl_dev *pctldev,
+			struct pinctrl_gpio_range *range, unsigned offset)
+{
+	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
+	struct mvebu_pinctrl_group *grp;
+	struct mvebu_mpp_ctrl_setting *setting;
+	unsigned long config;
+
+	grp = mvebu_pinctrl_find_group_by_pid(pctl, offset);
+	if (!grp)
+		return -EINVAL;
+
+	if (grp->ctrl->mpp_gpio_req)
+		return grp->ctrl->mpp_gpio_req(offset);
+
+	setting = mvebu_pinctrl_find_gpio_setting(pctl, grp);
+	if (!setting)
+		return -ENOTSUPP;
+
+	config = setting->val;
+
+	return mvebu_pinconf_group_set(pctldev, grp->gid, &config, 1);
+}
+
+static int mvebu_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev,
+	   struct pinctrl_gpio_range *range, unsigned offset, bool input)
+{
+	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
+	struct mvebu_pinctrl_group *grp;
+	struct mvebu_mpp_ctrl_setting *setting;
+
+	grp = mvebu_pinctrl_find_group_by_pid(pctl, offset);
+	if (!grp)
+		return -EINVAL;
+
+	if (grp->ctrl->mpp_gpio_dir)
+		return grp->ctrl->mpp_gpio_dir(offset, input);
+
+	setting = mvebu_pinctrl_find_gpio_setting(pctl, grp);
+	if (!setting)
+		return -ENOTSUPP;
+
+	if ((input && (setting->flags & MVEBU_SETTING_GPI)) ||
+	    (!input && (setting->flags & MVEBU_SETTING_GPO)))
+		return 0;
+
+	return -ENOTSUPP;
+}
+
+static const struct pinmux_ops mvebu_pinmux_ops = {
+	.get_functions_count = mvebu_pinmux_get_funcs_count,
+	.get_function_name = mvebu_pinmux_get_func_name,
+	.get_function_groups = mvebu_pinmux_get_groups,
+	.gpio_request_enable = mvebu_pinmux_gpio_request_enable,
+	.gpio_set_direction = mvebu_pinmux_gpio_set_direction,
+	.set_mux = mvebu_pinmux_set,
+};
+
+static int mvebu_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
+	return pctl->num_groups;
+}
+
+static const char *mvebu_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
+						unsigned gid)
+{
+	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
+	return pctl->groups[gid].name;
+}
+
+static int mvebu_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
+					unsigned gid, const unsigned **pins,
+					unsigned *num_pins)
+{
+	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
+	*pins = pctl->groups[gid].pins;
+	*num_pins = pctl->groups[gid].npins;
+	return 0;
+}
+
+static int mvebu_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
+					struct device_node *np,
+					struct pinctrl_map **map,
+					unsigned *num_maps)
+{
+	struct mvebu_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
+	struct property *prop;
+	const char *function;
+	const char *group;
+	int ret, nmaps, n;
+
+	*map = NULL;
+	*num_maps = 0;
+
+	ret = of_property_read_string(np, "marvell,function", &function);
+	if (ret) {
+		dev_err(pctl->dev,
+			"missing marvell,function in node %s\n", np->name);
+		return 0;
+	}
+
+	nmaps = of_property_count_strings(np, "marvell,pins");
+	if (nmaps < 0) {
+		dev_err(pctl->dev,
+			"missing marvell,pins in node %s\n", np->name);
+		return 0;
+	}
+
+	*map = kmalloc(nmaps * sizeof(struct pinctrl_map), GFP_KERNEL);
+	if (*map == NULL) {
+		dev_err(pctl->dev,
+			"cannot allocate pinctrl_map memory for %s\n",
+			np->name);
+		return -ENOMEM;
+	}
+
+	n = 0;
+	of_property_for_each_string(np, "marvell,pins", prop, group) {
+		struct mvebu_pinctrl_group *grp =
+			mvebu_pinctrl_find_group_by_name(pctl, group);
+
+		if (!grp) {
+			dev_err(pctl->dev, "unknown pin %s", group);
+			continue;
+		}
+
+		if (!mvebu_pinctrl_find_setting_by_name(pctl, grp, function)) {
+			dev_err(pctl->dev, "unsupported function %s on pin %s",
+				function, group);
+			continue;
+		}
+
+		(*map)[n].type = PIN_MAP_TYPE_MUX_GROUP;
+		(*map)[n].data.mux.group = group;
+		(*map)[n].data.mux.function = function;
+		n++;
+	}
+
+	*num_maps = nmaps;
+
+	return 0;
+}
+
+static void mvebu_pinctrl_dt_free_map(struct pinctrl_dev *pctldev,
+				struct pinctrl_map *map, unsigned num_maps)
+{
+	kfree(map);
+}
+
+static const struct pinctrl_ops mvebu_pinctrl_ops = {
+	.get_groups_count = mvebu_pinctrl_get_groups_count,
+	.get_group_name = mvebu_pinctrl_get_group_name,
+	.get_group_pins = mvebu_pinctrl_get_group_pins,
+	.dt_node_to_map = mvebu_pinctrl_dt_node_to_map,
+	.dt_free_map = mvebu_pinctrl_dt_free_map,
+};
+
+static int _add_function(struct mvebu_pinctrl_function *funcs, int *funcsize,
+			const char *name)
+{
+	if (*funcsize <= 0)
+		return -EOVERFLOW;
+
+	while (funcs->num_groups) {
+		/* function already there */
+		if (strcmp(funcs->name, name) == 0) {
+			funcs->num_groups++;
+			return -EEXIST;
+		}
+		funcs++;
+	}
+
+	/* append new unique function */
+	funcs->name = name;
+	funcs->num_groups = 1;
+	(*funcsize)--;
+
+	return 0;
+}
+
+static int mvebu_pinctrl_build_functions(struct platform_device *pdev,
+					 struct mvebu_pinctrl *pctl)
+{
+	struct mvebu_pinctrl_function *funcs;
+	int num = 0, funcsize = pctl->desc.npins;
+	int n, s;
+
+	/* we allocate functions for number of pins and hope
+	 * there are fewer unique functions than pins available */
+	funcs = devm_kzalloc(&pdev->dev, funcsize *
+			     sizeof(struct mvebu_pinctrl_function), GFP_KERNEL);
+	if (!funcs)
+		return -ENOMEM;
+
+	for (n = 0; n < pctl->num_groups; n++) {
+		struct mvebu_pinctrl_group *grp = &pctl->groups[n];
+		for (s = 0; s < grp->num_settings; s++) {
+			int ret;
+
+			/* skip unsupported settings on this variant */
+			if (pctl->variant &&
+			    !(pctl->variant & grp->settings[s].variant))
+				continue;
+
+			/* check for unique functions and count groups */
+			ret = _add_function(funcs, &funcsize,
+					    grp->settings[s].name);
+			if (ret == -EOVERFLOW)
+				dev_err(&pdev->dev,
+					"More functions than pins(%d)\n",
+					pctl->desc.npins);
+			if (ret < 0)
+				continue;
+
+			num++;
+		}
+	}
+
+	pctl->num_functions = num;
+	pctl->functions = funcs;
+
+	for (n = 0; n < pctl->num_groups; n++) {
+		struct mvebu_pinctrl_group *grp = &pctl->groups[n];
+		for (s = 0; s < grp->num_settings; s++) {
+			struct mvebu_pinctrl_function *f;
+			const char **groups;
+
+			/* skip unsupported settings on this variant */
+			if (pctl->variant &&
+			    !(pctl->variant & grp->settings[s].variant))
+				continue;
+
+			f = mvebu_pinctrl_find_function_by_name(pctl,
+							grp->settings[s].name);
+
+			/* allocate group name array if not done already */
+			if (!f->groups) {
+				f->groups = devm_kzalloc(&pdev->dev,
+						 f->num_groups * sizeof(char *),
+						 GFP_KERNEL);
+				if (!f->groups)
+					return -ENOMEM;
+			}
+
+			/* find next free group name and assign current name */
+			groups = f->groups;
+			while (*groups)
+				groups++;
+			*groups = grp->name;
+		}
+	}
+
+	return 0;
+}
+
+int mvebu_pinctrl_probe(struct platform_device *pdev)
+{
+	struct mvebu_pinctrl_soc_info *soc = dev_get_platdata(&pdev->dev);
+	struct mvebu_pinctrl *pctl;
+	struct pinctrl_pin_desc *pdesc;
+	unsigned gid, n, k;
+	unsigned size, noname = 0;
+	char *noname_buf;
+	void *p;
+	int ret;
+
+	if (!soc || !soc->controls || !soc->modes) {
+		dev_err(&pdev->dev, "wrong pinctrl soc info\n");
+		return -EINVAL;
+	}
+
+	pctl = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_pinctrl),
+			GFP_KERNEL);
+	if (!pctl) {
+		dev_err(&pdev->dev, "unable to alloc driver\n");
+		return -ENOMEM;
+	}
+
+	pctl->desc.name = dev_name(&pdev->dev);
+	pctl->desc.owner = THIS_MODULE;
+	pctl->desc.pctlops = &mvebu_pinctrl_ops;
+	pctl->desc.pmxops = &mvebu_pinmux_ops;
+	pctl->desc.confops = &mvebu_pinconf_ops;
+	pctl->variant = soc->variant;
+	pctl->dev = &pdev->dev;
+	platform_set_drvdata(pdev, pctl);
+
+	/* count controls and create names for mvebu generic
+	   register controls; also does sanity checks */
+	pctl->num_groups = 0;
+	pctl->desc.npins = 0;
+	for (n = 0; n < soc->ncontrols; n++) {
+		struct mvebu_mpp_ctrl *ctrl = &soc->controls[n];
+
+		pctl->desc.npins += ctrl->npins;
+		/* initialize control's pins[] array */
+		for (k = 0; k < ctrl->npins; k++)
+			ctrl->pins[k] = ctrl->pid + k;
+
+		/*
+		 * We allow to pass controls with NULL name that we treat
+		 * as a range of one-pin groups with generic mvebu register
+		 * controls.
+		 */
+		if (!ctrl->name) {
+			pctl->num_groups += ctrl->npins;
+			noname += ctrl->npins;
+		} else {
+			pctl->num_groups += 1;
+		}
+	}
+
+	pdesc = devm_kzalloc(&pdev->dev, pctl->desc.npins *
+			     sizeof(struct pinctrl_pin_desc), GFP_KERNEL);
+	if (!pdesc) {
+		dev_err(&pdev->dev, "failed to alloc pinctrl pins\n");
+		return -ENOMEM;
+	}
+
+	for (n = 0; n < pctl->desc.npins; n++)
+		pdesc[n].number = n;
+	pctl->desc.pins = pdesc;
+
+	/*
+	 * allocate groups and name buffers for unnamed groups.
+	 */
+	size = pctl->num_groups * sizeof(*pctl->groups) + noname * 8;
+	p = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
+	if (!p) {
+		dev_err(&pdev->dev, "failed to alloc group data\n");
+		return -ENOMEM;
+	}
+	pctl->groups = p;
+	noname_buf = p + pctl->num_groups * sizeof(*pctl->groups);
+
+	/* assign mpp controls to groups */
+	gid = 0;
+	for (n = 0; n < soc->ncontrols; n++) {
+		struct mvebu_mpp_ctrl *ctrl = &soc->controls[n];
+		pctl->groups[gid].gid = gid;
+		pctl->groups[gid].ctrl = ctrl;
+		pctl->groups[gid].name = ctrl->name;
+		pctl->groups[gid].pins = ctrl->pins;
+		pctl->groups[gid].npins = ctrl->npins;
+
+		/*
+		 * We treat unnamed controls as a range of one-pin groups
+		 * with generic mvebu register controls. Use one group for
+		 * each in this range and assign a default group name.
+		 */
+		if (!ctrl->name) {
+			pctl->groups[gid].name = noname_buf;
+			pctl->groups[gid].npins = 1;
+			sprintf(noname_buf, "mpp%d", ctrl->pid+0);
+			noname_buf += 8;
+
+			for (k = 1; k < ctrl->npins; k++) {
+				gid++;
+				pctl->groups[gid].gid = gid;
+				pctl->groups[gid].ctrl = ctrl;
+				pctl->groups[gid].name = noname_buf;
+				pctl->groups[gid].pins = &ctrl->pins[k];
+				pctl->groups[gid].npins = 1;
+				sprintf(noname_buf, "mpp%d", ctrl->pid+k);
+				noname_buf += 8;
+			}
+		}
+		gid++;
+	}
+
+	/* assign mpp modes to groups */
+	for (n = 0; n < soc->nmodes; n++) {
+		struct mvebu_mpp_mode *mode = &soc->modes[n];
+		struct mvebu_pinctrl_group *grp =
+			mvebu_pinctrl_find_group_by_pid(pctl, mode->pid);
+		unsigned num_settings;
+
+		if (!grp) {
+			dev_warn(&pdev->dev, "unknown pinctrl group %d\n",
+				mode->pid);
+			continue;
+		}
+
+		for (num_settings = 0; ;) {
+			struct mvebu_mpp_ctrl_setting *set =
+				&mode->settings[num_settings];
+
+			if (!set->name)
+				break;
+			num_settings++;
+
+			/* skip unsupported settings for this variant */
+			if (pctl->variant && !(pctl->variant & set->variant))
+				continue;
+
+			/* find gpio/gpo/gpi settings */
+			if (strcmp(set->name, "gpio") == 0)
+				set->flags = MVEBU_SETTING_GPI |
+					MVEBU_SETTING_GPO;
+			else if (strcmp(set->name, "gpo") == 0)
+				set->flags = MVEBU_SETTING_GPO;
+			else if (strcmp(set->name, "gpi") == 0)
+				set->flags = MVEBU_SETTING_GPI;
+		}
+
+		grp->settings = mode->settings;
+		grp->num_settings = num_settings;
+	}
+
+	ret = mvebu_pinctrl_build_functions(pdev, pctl);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to build functions\n");
+		return ret;
+	}
+
+	pctl->pctldev = pinctrl_register(&pctl->desc, &pdev->dev, pctl);
+	if (!pctl->pctldev) {
+		dev_err(&pdev->dev, "unable to register pinctrl driver\n");
+		return -EINVAL;
+	}
+
+	dev_info(&pdev->dev, "registered pinctrl driver\n");
+
+	/* register gpio ranges */
+	for (n = 0; n < soc->ngpioranges; n++)
+		pinctrl_add_gpio_range(pctl->pctldev, &soc->gpioranges[n]);
+
+	return 0;
+}
+
+int mvebu_pinctrl_remove(struct platform_device *pdev)
+{
+	struct mvebu_pinctrl *pctl = platform_get_drvdata(pdev);
+	pinctrl_unregister(pctl->pctldev);
+	return 0;
+}