pinctrl: UniPhier: add UniPhier pinctrl core support

The core support for the pinctrl drivers for all the UniPhier SoCs.

Changes in v2:
  - drop vogus THIS_MODULE because this file is always built-in
  - drop vogus "include <linux/module.h> because this file is
    always built-in

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 684 insertions, 0 deletions

diff --git a/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c b/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c
new file mode 100644
index 000000000000..918f3b643f1b
--- /dev/null
+++ b/drivers/pinctrl/uniphier/pinctrl-uniphier-core.c
@@ -0,0 +1,684 @@
+/*
+ * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/export.h>
+#include <linux/mfd/syscon.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include "../core.h"
+#include "../pinctrl-utils.h"
+#include "pinctrl-uniphier.h"
+
+struct uniphier_pinctrl_priv {
+	struct pinctrl_dev *pctldev;
+	struct regmap *regmap;
+	struct uniphier_pinctrl_socdata *socdata;
+};
+
+static int uniphier_pctl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev);
+
+	return priv->socdata->groups_count;
+}
+
+static const char *uniphier_pctl_get_group_name(struct pinctrl_dev *pctldev,
+						unsigned selector)
+{
+	struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev);
+
+	return priv->socdata->groups[selector].name;
+}
+
+static int uniphier_pctl_get_group_pins(struct pinctrl_dev *pctldev,
+					unsigned selector,
+					const unsigned **pins,
+					unsigned *num_pins)
+{
+	struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev);
+
+	*pins = priv->socdata->groups[selector].pins;
+	*num_pins = priv->socdata->groups[selector].num_pins;
+
+	return 0;
+}
+
+#ifdef CONFIG_DEBUG_FS
+static void uniphier_pctl_pin_dbg_show(struct pinctrl_dev *pctldev,
+				       struct seq_file *s, unsigned offset)
+{
+	const struct pinctrl_pin_desc *pin = &pctldev->desc->pins[offset];
+	const char *pull_dir, *drv_str;
+
+	switch (uniphier_pin_get_pull_dir(pin->drv_data)) {
+	case UNIPHIER_PIN_PULL_UP:
+		pull_dir = "UP";
+		break;
+	case UNIPHIER_PIN_PULL_DOWN:
+		pull_dir = "DOWN";
+		break;
+	case UNIPHIER_PIN_PULL_NONE:
+		pull_dir = "NONE";
+		break;
+	default:
+		BUG();
+	}
+
+	switch (uniphier_pin_get_drv_str(pin->drv_data)) {
+	case UNIPHIER_PIN_DRV_4_8:
+		drv_str = "4/8(mA)";
+		break;
+	case UNIPHIER_PIN_DRV_8_12_16_20:
+		drv_str = "8/12/16/20(mA)";
+		break;
+	case UNIPHIER_PIN_DRV_FIXED_4:
+		drv_str = "4(mA)";
+		break;
+	case UNIPHIER_PIN_DRV_FIXED_5:
+		drv_str = "5(mA)";
+		break;
+	case UNIPHIER_PIN_DRV_FIXED_8:
+		drv_str = "8(mA)";
+		break;
+	case UNIPHIER_PIN_DRV_NONE:
+		drv_str = "NONE";
+		break;
+	default:
+		BUG();
+	}
+
+	seq_printf(s, " PULL_DIR=%s  DRV_STR=%s", pull_dir, drv_str);
+}
+#endif
+
+static const struct pinctrl_ops uniphier_pctlops = {
+	.get_groups_count = uniphier_pctl_get_groups_count,
+	.get_group_name = uniphier_pctl_get_group_name,
+	.get_group_pins = uniphier_pctl_get_group_pins,
+#ifdef CONFIG_DEBUG_FS
+	.pin_dbg_show = uniphier_pctl_pin_dbg_show,
+#endif
+	.dt_node_to_map = pinconf_generic_dt_node_to_map_all,
+	.dt_free_map = pinctrl_utils_dt_free_map,
+};
+
+static int uniphier_conf_pin_bias_get(struct pinctrl_dev *pctldev,
+				      const struct pinctrl_pin_desc *pin,
+				      enum pin_config_param param)
+{
+	struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev);
+	enum uniphier_pin_pull_dir pull_dir =
+				uniphier_pin_get_pull_dir(pin->drv_data);
+	unsigned int pupdctrl, reg, shift, val;
+	unsigned int expected = 1;
+	int ret;
+
+	switch (param) {
+	case PIN_CONFIG_BIAS_DISABLE:
+		if (pull_dir == UNIPHIER_PIN_PULL_NONE)
+			return 0;
+		if (pull_dir == UNIPHIER_PIN_PULL_UP_FIXED ||
+		    pull_dir == UNIPHIER_PIN_PULL_DOWN_FIXED)
+			return -EINVAL;
+		expected = 0;
+		break;
+	case PIN_CONFIG_BIAS_PULL_UP:
+		if (pull_dir == UNIPHIER_PIN_PULL_UP_FIXED)
+			return 0;
+		if (pull_dir != UNIPHIER_PIN_PULL_UP)
+			return -EINVAL;
+		break;
+	case PIN_CONFIG_BIAS_PULL_DOWN:
+		if (pull_dir == UNIPHIER_PIN_PULL_DOWN_FIXED)
+			return 0;
+		if (pull_dir != UNIPHIER_PIN_PULL_DOWN)
+			return -EINVAL;
+		break;
+	default:
+		BUG();
+	}
+
+	pupdctrl = uniphier_pin_get_pupdctrl(pin->drv_data);
+
+	reg = UNIPHIER_PINCTRL_PUPDCTRL_BASE + pupdctrl / 32 * 4;
+	shift = pupdctrl % 32;
+
+	ret = regmap_read(priv->regmap, reg, &val);
+	if (ret)
+		return ret;
+
+	val = (val >> shift) & 1;
+
+	return (val == expected) ? 0 : -EINVAL;
+}
+
+static int uniphier_conf_pin_drive_get(struct pinctrl_dev *pctldev,
+				       const struct pinctrl_pin_desc *pin,
+				       u16 *strength)
+{
+	struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev);
+	enum uniphier_pin_drv_str drv_str =
+				uniphier_pin_get_drv_str(pin->drv_data);
+	const unsigned int strength_4_8[] = {4, 8};
+	const unsigned int strength_8_12_16_20[] = {8, 12, 16, 20};
+	const unsigned int *supported_strength;
+	unsigned int drvctrl, reg, shift, mask, width, val;
+	int ret;
+
+	switch (drv_str) {
+	case UNIPHIER_PIN_DRV_4_8:
+		supported_strength = strength_4_8;
+		width = 1;
+		break;
+	case UNIPHIER_PIN_DRV_8_12_16_20:
+		supported_strength = strength_8_12_16_20;
+		width = 2;
+		break;
+	case UNIPHIER_PIN_DRV_FIXED_4:
+		*strength = 4;
+		return 0;
+	case UNIPHIER_PIN_DRV_FIXED_5:
+		*strength = 5;
+		return 0;
+	case UNIPHIER_PIN_DRV_FIXED_8:
+		*strength = 8;
+		return 0;
+	default:
+		/* drive strength control is not supported for this pin */
+		return -EINVAL;
+	}
+
+	drvctrl = uniphier_pin_get_drvctrl(pin->drv_data);
+	drvctrl *= width;
+
+	reg = (width == 2) ? UNIPHIER_PINCTRL_DRV2CTRL_BASE :
+			     UNIPHIER_PINCTRL_DRVCTRL_BASE;
+
+	reg += drvctrl / 32 * 4;
+	shift = drvctrl % 32;
+	mask = (1U << width) - 1;
+
+	ret = regmap_read(priv->regmap, reg, &val);
+	if (ret)
+		return ret;
+
+	*strength = supported_strength[(val >> shift) & mask];
+
+	return 0;
+}
+
+static int uniphier_conf_pin_input_enable_get(struct pinctrl_dev *pctldev,
+					const struct pinctrl_pin_desc *pin)
+{
+	struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev);
+	unsigned int iectrl = uniphier_pin_get_iectrl(pin->drv_data);
+	unsigned int val;
+	int ret;
+
+	if (iectrl == UNIPHIER_PIN_IECTRL_NONE)
+		/* This pin is always input-enabled. */
+		return 0;
+
+	ret = regmap_read(priv->regmap, UNIPHIER_PINCTRL_IECTRL, &val);
+	if (ret)
+		return ret;
+
+	return val & BIT(iectrl) ? 0 : -EINVAL;
+}
+
+static int uniphier_conf_pin_config_get(struct pinctrl_dev *pctldev,
+					unsigned pin,
+					unsigned long *configs)
+{
+	const struct pinctrl_pin_desc *pin_desc = &pctldev->desc->pins[pin];
+	enum pin_config_param param = pinconf_to_config_param(*configs);
+	bool has_arg = false;
+	u16 arg;
+	int ret;
+
+	switch (param) {
+	case PIN_CONFIG_BIAS_DISABLE:
+	case PIN_CONFIG_BIAS_PULL_UP:
+	case PIN_CONFIG_BIAS_PULL_DOWN:
+		ret = uniphier_conf_pin_bias_get(pctldev, pin_desc, param);
+		break;
+	case PIN_CONFIG_DRIVE_STRENGTH:
+		ret = uniphier_conf_pin_drive_get(pctldev, pin_desc, &arg);
+		has_arg = true;
+		break;
+	case PIN_CONFIG_INPUT_ENABLE:
+		ret = uniphier_conf_pin_input_enable_get(pctldev, pin_desc);
+		break;
+	default:
+		/* unsupported parameter */
+		ret = -EINVAL;
+		break;
+	}
+
+	if (ret == 0 && has_arg)
+		*configs = pinconf_to_config_packed(param, arg);
+
+	return ret;
+}
+
+static int uniphier_conf_pin_bias_set(struct pinctrl_dev *pctldev,
+				      const struct pinctrl_pin_desc *pin,
+				      enum pin_config_param param,
+				      u16 arg)
+{
+	struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev);
+	enum uniphier_pin_pull_dir pull_dir =
+				uniphier_pin_get_pull_dir(pin->drv_data);
+	unsigned int pupdctrl, reg, shift;
+	unsigned int val = 1;
+
+	switch (param) {
+	case PIN_CONFIG_BIAS_DISABLE:
+		if (pull_dir == UNIPHIER_PIN_PULL_NONE)
+			return 0;
+		if (pull_dir == UNIPHIER_PIN_PULL_UP_FIXED ||
+		    pull_dir == UNIPHIER_PIN_PULL_DOWN_FIXED) {
+			dev_err(pctldev->dev,
+				"can not disable pull register for pin %u (%s)\n",
+				pin->number, pin->name);
+			return -EINVAL;
+		}
+		val = 0;
+		break;
+	case PIN_CONFIG_BIAS_PULL_UP:
+		if (pull_dir == UNIPHIER_PIN_PULL_UP_FIXED && arg != 0)
+			return 0;
+		if (pull_dir != UNIPHIER_PIN_PULL_UP) {
+			dev_err(pctldev->dev,
+				"pull-up is unsupported for pin %u (%s)\n",
+				pin->number, pin->name);
+			return -EINVAL;
+		}
+		if (arg == 0) {
+			dev_err(pctldev->dev, "pull-up can not be total\n");
+			return -EINVAL;
+		}
+		break;
+	case PIN_CONFIG_BIAS_PULL_DOWN:
+		if (pull_dir == UNIPHIER_PIN_PULL_DOWN_FIXED && arg != 0)
+			return 0;
+		if (pull_dir != UNIPHIER_PIN_PULL_DOWN) {
+			dev_err(pctldev->dev,
+				"pull-down is unsupported for pin %u (%s)\n",
+				pin->number, pin->name);
+			return -EINVAL;
+		}
+		if (arg == 0) {
+			dev_err(pctldev->dev, "pull-down can not be total\n");
+			return -EINVAL;
+		}
+		break;
+	case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
+		if (pull_dir == UNIPHIER_PIN_PULL_NONE) {
+			dev_err(pctldev->dev,
+				"pull-up/down is unsupported for pin %u (%s)\n",
+				pin->number, pin->name);
+			return -EINVAL;
+		}
+
+		if (arg == 0)
+			return 0; /* configuration ingored */
+		break;
+	default:
+		BUG();
+	}
+
+	pupdctrl = uniphier_pin_get_pupdctrl(pin->drv_data);
+
+	reg = UNIPHIER_PINCTRL_PUPDCTRL_BASE + pupdctrl / 32 * 4;
+	shift = pupdctrl % 32;
+
+	return regmap_update_bits(priv->regmap, reg, 1 << shift, val << shift);
+}
+
+static int uniphier_conf_pin_drive_set(struct pinctrl_dev *pctldev,
+				       const struct pinctrl_pin_desc *pin,
+				       u16 strength)
+{
+	struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev);
+	enum uniphier_pin_drv_str drv_str =
+				uniphier_pin_get_drv_str(pin->drv_data);
+	const unsigned int strength_4_8[] = {4, 8, -1};
+	const unsigned int strength_8_12_16_20[] = {8, 12, 16, 20, -1};
+	const unsigned int *supported_strength;
+	unsigned int drvctrl, reg, shift, mask, width, val;
+
+	switch (drv_str) {
+	case UNIPHIER_PIN_DRV_4_8:
+		supported_strength = strength_4_8;
+		width = 1;
+		break;
+	case UNIPHIER_PIN_DRV_8_12_16_20:
+		supported_strength = strength_8_12_16_20;
+		width = 2;
+		break;
+	default:
+		dev_err(pctldev->dev,
+			"cannot change drive strength for pin %u (%s)\n",
+			pin->number, pin->name);
+		return -EINVAL;
+	}
+
+	for (val = 0; supported_strength[val] > 0; val++) {
+		if (supported_strength[val] > strength)
+			break;
+	}
+
+	if (val == 0) {
+		dev_err(pctldev->dev,
+			"unsupported drive strength %u mA for pin %u (%s)\n",
+			strength, pin->number, pin->name);
+		return -EINVAL;
+	}
+
+	val--;
+
+	drvctrl = uniphier_pin_get_drvctrl(pin->drv_data);
+	drvctrl *= width;
+
+	reg = (width == 2) ? UNIPHIER_PINCTRL_DRV2CTRL_BASE :
+			     UNIPHIER_PINCTRL_DRVCTRL_BASE;
+
+	reg += drvctrl / 32 * 4;
+	shift = drvctrl % 32;
+	mask = (1U << width) - 1;
+
+	return regmap_update_bits(priv->regmap, reg,
+				  mask << shift, val << shift);
+}
+
+static int uniphier_conf_pin_input_enable(struct pinctrl_dev *pctldev,
+					  const struct pinctrl_pin_desc *pin,
+					  u16 enable)
+{
+	struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev);
+	unsigned int iectrl = uniphier_pin_get_iectrl(pin->drv_data);
+
+	if (enable == 0) {
+		/*
+		 * Multiple pins share one input enable, so per-pin disabling
+		 * is impossible.
+		 */
+		dev_err(pctldev->dev, "unable to disable input\n");
+		return -EINVAL;
+	}
+
+	if (iectrl == UNIPHIER_PIN_IECTRL_NONE)
+		/* This pin is always input-enabled. nothing to do. */
+		return 0;
+
+	return regmap_update_bits(priv->regmap, UNIPHIER_PINCTRL_IECTRL,
+				  BIT(iectrl), BIT(iectrl));
+}
+
+static int uniphier_conf_pin_config_set(struct pinctrl_dev *pctldev,
+					unsigned pin,
+					unsigned long *configs,
+					unsigned num_configs)
+{
+	const struct pinctrl_pin_desc *pin_desc = &pctldev->desc->pins[pin];
+	int i, ret;
+
+	for (i = 0; i < num_configs; i++) {
+		enum pin_config_param param =
+					pinconf_to_config_param(configs[i]);
+		u16 arg = pinconf_to_config_argument(configs[i]);
+
+		switch (param) {
+		case PIN_CONFIG_BIAS_DISABLE:
+		case PIN_CONFIG_BIAS_PULL_UP:
+		case PIN_CONFIG_BIAS_PULL_DOWN:
+		case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
+			ret = uniphier_conf_pin_bias_set(pctldev, pin_desc,
+							 param, arg);
+			break;
+		case PIN_CONFIG_DRIVE_STRENGTH:
+			ret = uniphier_conf_pin_drive_set(pctldev, pin_desc,
+							  arg);
+			break;
+		case PIN_CONFIG_INPUT_ENABLE:
+			ret = uniphier_conf_pin_input_enable(pctldev,
+							     pin_desc, arg);
+			break;
+		default:
+			dev_err(pctldev->dev,
+				"unsupported configuration parameter %u\n",
+				param);
+			return -EINVAL;
+		}
+
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int uniphier_conf_pin_config_group_set(struct pinctrl_dev *pctldev,
+					      unsigned selector,
+					      unsigned long *configs,
+					      unsigned num_configs)
+{
+	struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev);
+	const unsigned *pins = priv->socdata->groups[selector].pins;
+	unsigned num_pins = priv->socdata->groups[selector].num_pins;
+	int i, ret;
+
+	for (i = 0; i < num_pins; i++) {
+		ret = uniphier_conf_pin_config_set(pctldev, pins[i],
+						   configs, num_configs);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static const struct pinconf_ops uniphier_confops = {
+	.is_generic = true,
+	.pin_config_get = uniphier_conf_pin_config_get,
+	.pin_config_set = uniphier_conf_pin_config_set,
+	.pin_config_group_set = uniphier_conf_pin_config_group_set,
+};
+
+static int uniphier_pmx_get_functions_count(struct pinctrl_dev *pctldev)
+{
+	struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev);
+
+	return priv->socdata->functions_count;
+}
+
+static const char *uniphier_pmx_get_function_name(struct pinctrl_dev *pctldev,
+						  unsigned selector)
+{
+	struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev);
+
+	return priv->socdata->functions[selector].name;
+}
+
+static int uniphier_pmx_get_function_groups(struct pinctrl_dev *pctldev,
+					    unsigned selector,
+					    const char * const **groups,
+					    unsigned *num_groups)
+{
+	struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev);
+
+	*groups = priv->socdata->functions[selector].groups;
+	*num_groups = priv->socdata->functions[selector].num_groups;
+
+	return 0;
+}
+
+static int uniphier_pmx_set_one_mux(struct pinctrl_dev *pctldev, unsigned pin,
+				    unsigned muxval)
+{
+	struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev);
+	unsigned mux_bits = priv->socdata->mux_bits;
+	unsigned reg_stride = priv->socdata->reg_stride;
+	unsigned reg, reg_end, shift, mask;
+	int ret;
+
+	reg = UNIPHIER_PINCTRL_PINMUX_BASE + pin * mux_bits / 32 * reg_stride;
+	reg_end = reg + reg_stride;
+	shift = pin * mux_bits % 32;
+	mask = (1U << mux_bits) - 1;
+
+	/*
+	 * If reg_stride is greater than 4, the MSB of each pinsel shall be
+	 * stored in the offset+4.
+	 */
+	for (; reg < reg_end; reg += 4) {
+		ret = regmap_update_bits(priv->regmap, reg,
+					 mask << shift, muxval << shift);
+		if (ret)
+			return ret;
+		muxval >>= mux_bits;
+	}
+
+	if (priv->socdata->load_pinctrl) {
+		ret = regmap_write(priv->regmap,
+				   UNIPHIER_PINCTRL_LOAD_PINMUX, 1);
+		if (ret)
+			return ret;
+	}
+
+	/* some pins need input-enabling */
+	return uniphier_conf_pin_input_enable(pctldev,
+					      &pctldev->desc->pins[pin], 1);
+}
+
+static int uniphier_pmx_set_mux(struct pinctrl_dev *pctldev,
+				unsigned func_selector,
+				unsigned group_selector)
+{
+	struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev);
+	const struct uniphier_pinctrl_group *grp =
+					&priv->socdata->groups[group_selector];
+	int i;
+	int ret;
+
+	for (i = 0; i < grp->num_pins; i++) {
+		ret = uniphier_pmx_set_one_mux(pctldev, grp->pins[i],
+					       grp->muxvals[i]);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int uniphier_pmx_gpio_request_enable(struct pinctrl_dev *pctldev,
+					    struct pinctrl_gpio_range *range,
+					    unsigned offset)
+{
+	struct uniphier_pinctrl_priv *priv = pinctrl_dev_get_drvdata(pctldev);
+	const struct uniphier_pinctrl_group *groups = priv->socdata->groups;
+	int groups_count = priv->socdata->groups_count;
+	enum uniphier_pinmux_gpio_range_type range_type;
+	int i, j;
+
+	if (strstr(range->name, "irq"))
+		range_type = UNIPHIER_PINMUX_GPIO_RANGE_IRQ;
+	else
+		range_type = UNIPHIER_PINMUX_GPIO_RANGE_PORT;
+
+	for (i = 0; i < groups_count; i++) {
+		if (groups[i].range_type != range_type)
+			continue;
+
+		for (j = 0; j < groups[i].num_pins; j++)
+			if (groups[i].pins[j] == offset)
+				goto found;
+	}
+
+	dev_err(pctldev->dev, "pin %u does not support GPIO\n", offset);
+	return -EINVAL;
+
+found:
+	return uniphier_pmx_set_one_mux(pctldev, offset, groups[i].muxvals[j]);
+}
+
+static const struct pinmux_ops uniphier_pmxops = {
+	.get_functions_count = uniphier_pmx_get_functions_count,
+	.get_function_name = uniphier_pmx_get_function_name,
+	.get_function_groups = uniphier_pmx_get_function_groups,
+	.set_mux = uniphier_pmx_set_mux,
+	.gpio_request_enable = uniphier_pmx_gpio_request_enable,
+	.strict = true,
+};
+
+int uniphier_pinctrl_probe(struct platform_device *pdev,
+			   struct pinctrl_desc *desc,
+			   struct uniphier_pinctrl_socdata *socdata)
+{
+	struct device *dev = &pdev->dev;
+	struct uniphier_pinctrl_priv *priv;
+
+	if (!socdata ||
+	    !socdata->groups ||
+	    !socdata->groups_count ||
+	    !socdata->functions ||
+	    !socdata->functions_count ||
+	    !socdata->mux_bits ||
+	    !socdata->reg_stride) {
+		dev_err(dev, "pinctrl socdata lacks necessary members\n");
+		return -EINVAL;
+	}
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->regmap = syscon_node_to_regmap(dev->of_node);
+	if (IS_ERR(priv->regmap)) {
+		dev_err(dev, "failed to get regmap\n");
+		return PTR_ERR(priv->regmap);
+	}
+
+	priv->socdata = socdata;
+	desc->pctlops = &uniphier_pctlops;
+	desc->pmxops = &uniphier_pmxops;
+	desc->confops = &uniphier_confops;
+
+	priv->pctldev = pinctrl_register(desc, dev, priv);
+	if (IS_ERR(priv->pctldev)) {
+		dev_err(dev, "failed to register UniPhier pinctrl driver\n");
+		return PTR_ERR(priv->pctldev);
+	}
+
+	platform_set_drvdata(pdev, priv);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(uniphier_pinctrl_probe);
+
+int uniphier_pinctrl_remove(struct platform_device *pdev)
+{
+	struct uniphier_pinctrl_priv *priv = platform_get_drvdata(pdev);
+
+	pinctrl_unregister(priv->pctldev);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(uniphier_pinctrl_remove);