drivers/pinctrl/spear/pinctrl-spear.c - kernel/msm-4.9 - Gitiles

 /*
  * Driver for the ST Microelectronics SPEAr pinmux
  *
  * Copyright (C) 2012 ST Microelectronics
  * Viresh Kumar <viresh.linux@gmail.com>
  *
  * Inspired from:
  * - U300 Pinctl drivers
  * - Tegra Pinctl drivers
  *
  * 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/err.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_gpio.h>
 #include <linux/pinctrl/machine.h>
 #include <linux/pinctrl/pinctrl.h>
 #include <linux/pinctrl/pinmux.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>

 #include "pinctrl-spear.h"

 #define DRIVER_NAME "spear-pinmux"

 static void muxregs_endisable(struct spear_pmx *pmx,
 		struct spear_muxreg *muxregs, u8 count, bool enable)
 {
 	struct spear_muxreg *muxreg;
 	u32 val, temp, j;

 	for (j = 0; j < count; j++) {
 		muxreg = &muxregs[j];

 		val = pmx_readl(pmx, muxreg->reg);
 		val &= ~muxreg->mask;

 		if (enable)
 			temp = muxreg->val;
 		else
 			temp = ~muxreg->val;

 		val |= muxreg->mask & temp;
 		pmx_writel(pmx, val, muxreg->reg);
 	}
 }

 static int set_mode(struct spear_pmx *pmx, int mode)
 {
 	struct spear_pmx_mode *pmx_mode = NULL;
 	int i;
 	u32 val;

 	if (!pmx->machdata->pmx_modes || !pmx->machdata->npmx_modes)
 		return -EINVAL;

 	for (i = 0; i < pmx->machdata->npmx_modes; i++) {
 		if (pmx->machdata->pmx_modes[i]->mode == (1 << mode)) {
 			pmx_mode = pmx->machdata->pmx_modes[i];
 			break;
 		}
 	}

 	if (!pmx_mode)
 		return -EINVAL;

 	val = pmx_readl(pmx, pmx_mode->reg);
 	val &= ~pmx_mode->mask;
 	val |= pmx_mode->val;
 	pmx_writel(pmx, val, pmx_mode->reg);

 	pmx->machdata->mode = pmx_mode->mode;
 	dev_info(pmx->dev, "Configured Mode: %s with id: %x\n\n",
 			pmx_mode->name ? pmx_mode->name : "no_name",
 			pmx_mode->reg);

 	return 0;
 }

 void pmx_init_gpio_pingroup_addr(struct spear_gpio_pingroup *gpio_pingroup,
 				 unsigned count, u16 reg)
 {
 	int i, j;

 	for (i = 0; i < count; i++)
 		for (j = 0; j < gpio_pingroup[i].nmuxregs; j++)
 			gpio_pingroup[i].muxregs[j].reg = reg;
 }

 void pmx_init_addr(struct spear_pinctrl_machdata *machdata, u16 reg)
 {
 	struct spear_pingroup *pgroup;
 	struct spear_modemux *modemux;
 	int i, j, group;

 	for (group = 0; group < machdata->ngroups; group++) {
 		pgroup = machdata->groups[group];

 		for (i = 0; i < pgroup->nmodemuxs; i++) {
 			modemux = &pgroup->modemuxs[i];

 			for (j = 0; j < modemux->nmuxregs; j++)
 				if (modemux->muxregs[j].reg == 0xFFFF)
 					modemux->muxregs[j].reg = reg;
 		}
 	}
 }

 static int spear_pinctrl_get_groups_cnt(struct pinctrl_dev *pctldev)
 {
 	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

 	return pmx->machdata->ngroups;
 }

 static const char *spear_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
 		unsigned group)
 {
 	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

 	return pmx->machdata->groups[group]->name;
 }

 static int spear_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
 		unsigned group, const unsigned **pins, unsigned *num_pins)
 {
 	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

 	*pins = pmx->machdata->groups[group]->pins;
 	*num_pins = pmx->machdata->groups[group]->npins;

 	return 0;
 }

 static void spear_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
 		struct seq_file *s, unsigned offset)
 {
 	seq_printf(s, " " DRIVER_NAME);
 }

 static int spear_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
 					struct device_node *np_config,
 					struct pinctrl_map **map,
 					unsigned *num_maps)
 {
 	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
 	struct device_node *np;
 	struct property *prop;
 	const char *function, *group;
 	int ret, index = 0, count = 0;

 	/* calculate number of maps required */
 	for_each_child_of_node(np_config, np) {
 		ret = of_property_read_string(np, "st,function", &function);
 		if (ret < 0)
 			return ret;

 		ret = of_property_count_strings(np, "st,pins");
 		if (ret < 0)
 			return ret;

 		count += ret;
 	}

 	if (!count) {
 		dev_err(pmx->dev, "No child nodes passed via DT\n");
 		return -ENODEV;
 	}

 	*map = kzalloc(sizeof(**map) * count, GFP_KERNEL);
 	if (!*map)
 		return -ENOMEM;

 	for_each_child_of_node(np_config, np) {
 		of_property_read_string(np, "st,function", &function);
 		of_property_for_each_string(np, "st,pins", prop, group) {
 			(*map)[index].type = PIN_MAP_TYPE_MUX_GROUP;
 			(*map)[index].data.mux.group = group;
 			(*map)[index].data.mux.function = function;
 			index++;
 		}
 	}

 	*num_maps = count;

 	return 0;
 }

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

 static const struct pinctrl_ops spear_pinctrl_ops = {
 	.get_groups_count = spear_pinctrl_get_groups_cnt,
 	.get_group_name = spear_pinctrl_get_group_name,
 	.get_group_pins = spear_pinctrl_get_group_pins,
 	.pin_dbg_show = spear_pinctrl_pin_dbg_show,
 	.dt_node_to_map = spear_pinctrl_dt_node_to_map,
 	.dt_free_map = spear_pinctrl_dt_free_map,
 };

 static int spear_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev)
 {
 	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

 	return pmx->machdata->nfunctions;
 }

 static const char *spear_pinctrl_get_func_name(struct pinctrl_dev *pctldev,
 		unsigned function)
 {
 	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

 	return pmx->machdata->functions[function]->name;
 }

 static int spear_pinctrl_get_func_groups(struct pinctrl_dev *pctldev,
 		unsigned function, const char *const **groups,
 		unsigned * const ngroups)
 {
 	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

 	*groups = pmx->machdata->functions[function]->groups;
 	*ngroups = pmx->machdata->functions[function]->ngroups;

 	return 0;
 }

 static int spear_pinctrl_endisable(struct pinctrl_dev *pctldev,
 		unsigned function, unsigned group, bool enable)
 {
 	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
 	const struct spear_pingroup *pgroup;
 	const struct spear_modemux *modemux;
 	int i;
 	bool found = false;

 	pgroup = pmx->machdata->groups[group];

 	for (i = 0; i < pgroup->nmodemuxs; i++) {
 		modemux = &pgroup->modemuxs[i];

 		/* SoC have any modes */
 		if (pmx->machdata->modes_supported) {
 			if (!(pmx->machdata->mode & modemux->modes))
 				continue;
 		}

 		found = true;
 		muxregs_endisable(pmx, modemux->muxregs, modemux->nmuxregs,
 				enable);
 	}

 	if (!found) {
 		dev_err(pmx->dev, "pinmux group: %s not supported\n",
 				pgroup->name);
 		return -ENODEV;
 	}

 	return 0;
 }

 static int spear_pinctrl_enable(struct pinctrl_dev *pctldev, unsigned function,
 		unsigned group)
 {
 	return spear_pinctrl_endisable(pctldev, function, group, true);
 }

 /* gpio with pinmux */
 static struct spear_gpio_pingroup *get_gpio_pingroup(struct spear_pmx *pmx,
 		unsigned pin)
 {
 	struct spear_gpio_pingroup *gpio_pingroup;
 	int i, j;

 	if (!pmx->machdata->gpio_pingroups)
 		return NULL;

 	for (i = 0; i < pmx->machdata->ngpio_pingroups; i++) {
 		gpio_pingroup = &pmx->machdata->gpio_pingroups[i];

 		for (j = 0; j < gpio_pingroup->npins; j++) {
 			if (gpio_pingroup->pins[j] == pin)
 				return gpio_pingroup;
 		}
 	}

 	return NULL;
 }

 static int gpio_request_endisable(struct pinctrl_dev *pctldev,
 		struct pinctrl_gpio_range *range, unsigned offset, bool enable)
 {
 	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
 	struct spear_pinctrl_machdata *machdata = pmx->machdata;
 	struct spear_gpio_pingroup *gpio_pingroup;

 	/*
 	 * Some SoC have configuration options applicable to group of pins,
 	 * rather than a single pin.
 	 */
 	gpio_pingroup = get_gpio_pingroup(pmx, offset);
 	if (gpio_pingroup)
 		muxregs_endisable(pmx, gpio_pingroup->muxregs,
 				gpio_pingroup->nmuxregs, enable);

 	/*
 	 * SoC may need some extra configurations, or configurations for single
 	 * pin
 	 */
 	if (machdata->gpio_request_endisable)
 		machdata->gpio_request_endisable(pmx, offset, enable);

 	return 0;
 }

 static int gpio_request_enable(struct pinctrl_dev *pctldev,
 		struct pinctrl_gpio_range *range, unsigned offset)
 {
 	return gpio_request_endisable(pctldev, range, offset, true);
 }

 static void gpio_disable_free(struct pinctrl_dev *pctldev,
 		struct pinctrl_gpio_range *range, unsigned offset)
 {
 	gpio_request_endisable(pctldev, range, offset, false);
 }

 static const struct pinmux_ops spear_pinmux_ops = {
 	.get_functions_count = spear_pinctrl_get_funcs_count,
 	.get_function_name = spear_pinctrl_get_func_name,
 	.get_function_groups = spear_pinctrl_get_func_groups,
 	.enable = spear_pinctrl_enable,
 	.gpio_request_enable = gpio_request_enable,
 	.gpio_disable_free = gpio_disable_free,
 };

 static struct pinctrl_desc spear_pinctrl_desc = {
 	.name = DRIVER_NAME,
 	.pctlops = &spear_pinctrl_ops,
 	.pmxops = &spear_pinmux_ops,
 	.owner = THIS_MODULE,
 };

 int spear_pinctrl_probe(struct platform_device *pdev,
 			struct spear_pinctrl_machdata *machdata)
 {
 	struct device_node *np = pdev->dev.of_node;
 	struct resource *res;
 	struct spear_pmx *pmx;

 	if (!machdata)
 		return -ENODEV;

 	pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
 	if (!pmx) {
 		dev_err(&pdev->dev, "Can't alloc spear_pmx\n");
 		return -ENOMEM;
 	}

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

 	pmx->dev = &pdev->dev;
 	pmx->machdata = machdata;

 	/* configure mode, if supported by SoC */
 	if (machdata->modes_supported) {
 		int mode = 0;

 		if (of_property_read_u32(np, "st,pinmux-mode", &mode)) {
 			dev_err(&pdev->dev, "OF: pinmux mode not passed\n");
 			return -EINVAL;
 		}

 		if (set_mode(pmx, mode)) {
 			dev_err(&pdev->dev, "OF: Couldn't configure mode: %x\n",
 					mode);
 			return -EINVAL;
 		}
 	}

 	platform_set_drvdata(pdev, pmx);

 	spear_pinctrl_desc.pins = machdata->pins;
 	spear_pinctrl_desc.npins = machdata->npins;

 	pmx->pctl = pinctrl_register(&spear_pinctrl_desc, &pdev->dev, pmx);
 	if (!pmx->pctl) {
 		dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
 		return -ENODEV;
 	}

 	return 0;
 }

 int spear_pinctrl_remove(struct platform_device *pdev)
 {
 	struct spear_pmx *pmx = platform_get_drvdata(pdev);

 	pinctrl_unregister(pmx->pctl);

 	return 0;
 }
	/*
	* Driver for the ST Microelectronics SPEAr pinmux
	*
	* Copyright (C) 2012 ST Microelectronics
	* Viresh Kumar <viresh.linux@gmail.com>
	*
	* Inspired from:
	* - U300 Pinctl drivers
	* - Tegra Pinctl drivers
	*
	* 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/err.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/of_address.h>
	#include <linux/of_gpio.h>
	#include <linux/pinctrl/machine.h>
	#include <linux/pinctrl/pinctrl.h>
	#include <linux/pinctrl/pinmux.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>

	#include "pinctrl-spear.h"

	#define DRIVER_NAME "spear-pinmux"

	static void muxregs_endisable(struct spear_pmx *pmx,
	struct spear_muxreg *muxregs, u8 count, bool enable)
	{
	struct spear_muxreg *muxreg;
	u32 val, temp, j;

	for (j = 0; j < count; j++) {
	muxreg = &muxregs[j];

	val = pmx_readl(pmx, muxreg->reg);
	val &= ~muxreg->mask;

	if (enable)
	temp = muxreg->val;
	else
	temp = ~muxreg->val;

	val \|= muxreg->mask & temp;
	pmx_writel(pmx, val, muxreg->reg);
	}
	}

	static int set_mode(struct spear_pmx *pmx, int mode)
	{
	struct spear_pmx_mode *pmx_mode = NULL;
	int i;
	u32 val;

	if (!pmx->machdata->pmx_modes \|\| !pmx->machdata->npmx_modes)
	return -EINVAL;

	for (i = 0; i < pmx->machdata->npmx_modes; i++) {
	if (pmx->machdata->pmx_modes[i]->mode == (1 << mode)) {
	pmx_mode = pmx->machdata->pmx_modes[i];
	break;
	}
	}

	if (!pmx_mode)
	return -EINVAL;

	val = pmx_readl(pmx, pmx_mode->reg);
	val &= ~pmx_mode->mask;
	val \|= pmx_mode->val;
	pmx_writel(pmx, val, pmx_mode->reg);

	pmx->machdata->mode = pmx_mode->mode;
	dev_info(pmx->dev, "Configured Mode: %s with id: %x\n\n",
	pmx_mode->name ? pmx_mode->name : "no_name",
	pmx_mode->reg);

	return 0;
	}

	void pmx_init_gpio_pingroup_addr(struct spear_gpio_pingroup *gpio_pingroup,
	unsigned count, u16 reg)
	{
	int i, j;

	for (i = 0; i < count; i++)
	for (j = 0; j < gpio_pingroup[i].nmuxregs; j++)
	gpio_pingroup[i].muxregs[j].reg = reg;
	}

	void pmx_init_addr(struct spear_pinctrl_machdata *machdata, u16 reg)
	{
	struct spear_pingroup *pgroup;
	struct spear_modemux *modemux;
	int i, j, group;

	for (group = 0; group < machdata->ngroups; group++) {
	pgroup = machdata->groups[group];

	for (i = 0; i < pgroup->nmodemuxs; i++) {
	modemux = &pgroup->modemuxs[i];

	for (j = 0; j < modemux->nmuxregs; j++)
	if (modemux->muxregs[j].reg == 0xFFFF)
	modemux->muxregs[j].reg = reg;
	}
	}
	}

	static int spear_pinctrl_get_groups_cnt(struct pinctrl_dev *pctldev)
	{
	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

	return pmx->machdata->ngroups;
	}

	static const char spear_pinctrl_get_group_name(struct pinctrl_dev pctldev,
	unsigned group)
	{
	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

	return pmx->machdata->groups[group]->name;
	}

	static int spear_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
	unsigned group, const unsigned *pins, unsigned num_pins)
	{
	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

	*pins = pmx->machdata->groups[group]->pins;
	*num_pins = pmx->machdata->groups[group]->npins;

	return 0;
	}

	static void spear_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
	struct seq_file *s, unsigned offset)
	{
	seq_printf(s, " " DRIVER_NAME);
	}

	static int spear_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
	struct device_node *np_config,
	struct pinctrl_map **map,
	unsigned *num_maps)
	{
	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
	struct device_node *np;
	struct property *prop;
	const char function, group;
	int ret, index = 0, count = 0;

	/* calculate number of maps required */
	for_each_child_of_node(np_config, np) {
	ret = of_property_read_string(np, "st,function", &function);
	if (ret < 0)
	return ret;

	ret = of_property_count_strings(np, "st,pins");
	if (ret < 0)
	return ret;

	count += ret;
	}

	if (!count) {
	dev_err(pmx->dev, "No child nodes passed via DT\n");
	return -ENODEV;
	}

	map = kzalloc(sizeof(map) count, GFP_KERNEL);
	if (!*map)
	return -ENOMEM;

	for_each_child_of_node(np_config, np) {
	of_property_read_string(np, "st,function", &function);
	of_property_for_each_string(np, "st,pins", prop, group) {
	(*map)[index].type = PIN_MAP_TYPE_MUX_GROUP;
	(*map)[index].data.mux.group = group;
	(*map)[index].data.mux.function = function;
	index++;
	}
	}

	*num_maps = count;

	return 0;
	}

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

	static const struct pinctrl_ops spear_pinctrl_ops = {
	.get_groups_count = spear_pinctrl_get_groups_cnt,
	.get_group_name = spear_pinctrl_get_group_name,
	.get_group_pins = spear_pinctrl_get_group_pins,
	.pin_dbg_show = spear_pinctrl_pin_dbg_show,
	.dt_node_to_map = spear_pinctrl_dt_node_to_map,
	.dt_free_map = spear_pinctrl_dt_free_map,
	};

	static int spear_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev)
	{
	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

	return pmx->machdata->nfunctions;
	}

	static const char spear_pinctrl_get_func_name(struct pinctrl_dev pctldev,
	unsigned function)
	{
	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

	return pmx->machdata->functions[function]->name;
	}

	static int spear_pinctrl_get_func_groups(struct pinctrl_dev *pctldev,
	unsigned function, const char const *groups,
	unsigned * const ngroups)
	{
	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);

	*groups = pmx->machdata->functions[function]->groups;
	*ngroups = pmx->machdata->functions[function]->ngroups;

	return 0;
	}

	static int spear_pinctrl_endisable(struct pinctrl_dev *pctldev,
	unsigned function, unsigned group, bool enable)
	{
	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
	const struct spear_pingroup *pgroup;
	const struct spear_modemux *modemux;
	int i;
	bool found = false;

	pgroup = pmx->machdata->groups[group];

	for (i = 0; i < pgroup->nmodemuxs; i++) {
	modemux = &pgroup->modemuxs[i];

	/* SoC have any modes */
	if (pmx->machdata->modes_supported) {
	if (!(pmx->machdata->mode & modemux->modes))
	continue;
	}

	found = true;
	muxregs_endisable(pmx, modemux->muxregs, modemux->nmuxregs,
	enable);
	}

	if (!found) {
	dev_err(pmx->dev, "pinmux group: %s not supported\n",
	pgroup->name);
	return -ENODEV;
	}

	return 0;
	}

	static int spear_pinctrl_enable(struct pinctrl_dev *pctldev, unsigned function,
	unsigned group)
	{
	return spear_pinctrl_endisable(pctldev, function, group, true);
	}

	/* gpio with pinmux */
	static struct spear_gpio_pingroup get_gpio_pingroup(struct spear_pmx pmx,
	unsigned pin)
	{
	struct spear_gpio_pingroup *gpio_pingroup;
	int i, j;

	if (!pmx->machdata->gpio_pingroups)
	return NULL;

	for (i = 0; i < pmx->machdata->ngpio_pingroups; i++) {
	gpio_pingroup = &pmx->machdata->gpio_pingroups[i];

	for (j = 0; j < gpio_pingroup->npins; j++) {
	if (gpio_pingroup->pins[j] == pin)
	return gpio_pingroup;
	}
	}

	return NULL;
	}

	static int gpio_request_endisable(struct pinctrl_dev *pctldev,
	struct pinctrl_gpio_range *range, unsigned offset, bool enable)
	{
	struct spear_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
	struct spear_pinctrl_machdata *machdata = pmx->machdata;
	struct spear_gpio_pingroup *gpio_pingroup;

	/*
	* Some SoC have configuration options applicable to group of pins,
	* rather than a single pin.
	*/
	gpio_pingroup = get_gpio_pingroup(pmx, offset);
	if (gpio_pingroup)
	muxregs_endisable(pmx, gpio_pingroup->muxregs,
	gpio_pingroup->nmuxregs, enable);

	/*
	* SoC may need some extra configurations, or configurations for single
	* pin
	*/
	if (machdata->gpio_request_endisable)
	machdata->gpio_request_endisable(pmx, offset, enable);

	return 0;
	}

	static int gpio_request_enable(struct pinctrl_dev *pctldev,
	struct pinctrl_gpio_range *range, unsigned offset)
	{
	return gpio_request_endisable(pctldev, range, offset, true);
	}

	static void gpio_disable_free(struct pinctrl_dev *pctldev,
	struct pinctrl_gpio_range *range, unsigned offset)
	{
	gpio_request_endisable(pctldev, range, offset, false);
	}

	static const struct pinmux_ops spear_pinmux_ops = {
	.get_functions_count = spear_pinctrl_get_funcs_count,
	.get_function_name = spear_pinctrl_get_func_name,
	.get_function_groups = spear_pinctrl_get_func_groups,
	.enable = spear_pinctrl_enable,
	.gpio_request_enable = gpio_request_enable,
	.gpio_disable_free = gpio_disable_free,
	};

	static struct pinctrl_desc spear_pinctrl_desc = {
	.name = DRIVER_NAME,
	.pctlops = &spear_pinctrl_ops,
	.pmxops = &spear_pinmux_ops,
	.owner = THIS_MODULE,
	};

	int spear_pinctrl_probe(struct platform_device *pdev,
	struct spear_pinctrl_machdata *machdata)
	{
	struct device_node *np = pdev->dev.of_node;
	struct resource *res;
	struct spear_pmx *pmx;

	if (!machdata)
	return -ENODEV;

	pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
	if (!pmx) {
	dev_err(&pdev->dev, "Can't alloc spear_pmx\n");
	return -ENOMEM;
	}

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

	pmx->dev = &pdev->dev;
	pmx->machdata = machdata;

	/* configure mode, if supported by SoC */
	if (machdata->modes_supported) {
	int mode = 0;

	if (of_property_read_u32(np, "st,pinmux-mode", &mode)) {
	dev_err(&pdev->dev, "OF: pinmux mode not passed\n");
	return -EINVAL;
	}

	if (set_mode(pmx, mode)) {
	dev_err(&pdev->dev, "OF: Couldn't configure mode: %x\n",
	mode);
	return -EINVAL;
	}
	}

	platform_set_drvdata(pdev, pmx);

	spear_pinctrl_desc.pins = machdata->pins;
	spear_pinctrl_desc.npins = machdata->npins;

	pmx->pctl = pinctrl_register(&spear_pinctrl_desc, &pdev->dev, pmx);
	if (!pmx->pctl) {
	dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
	return -ENODEV;
	}

	return 0;
	}

	int spear_pinctrl_remove(struct platform_device *pdev)
	{
	struct spear_pmx *pmx = platform_get_drvdata(pdev);

	pinctrl_unregister(pmx->pctl);

	return 0;
	}