[PATCH 2/6] pinctrl: armada-37xx: Add pin controller support for Armada 37xx

[Gregory CLEMENT <gregory.clement@free-electrons.com>]

The Armada 37xx SoC come with 2 pin controllers: one on the south
bridge (managing 28 pins) and one on the north bridge (managing 36 pins).

At the hardware level the controller configure the pins by group and not
pin by pin. This constraint is reflected in the design of the driver:
only the group related functions are implemented.

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
---
 arch/arm64/Kconfig.platforms                |   2 +
 drivers/pinctrl/Makefile                    |   2 +-
 drivers/pinctrl/mvebu/Kconfig               |   7 +
 drivers/pinctrl/mvebu/Makefile              |   3 +-
 drivers/pinctrl/mvebu/pinctrl-armada-37xx.c | 590 ++++++++++++++++++++++++++++
 5 files changed, 602 insertions(+), 2 deletions(-)
 create mode 100644 drivers/pinctrl/mvebu/pinctrl-armada-37xx.c

diff --git a/arch/arm64/Kconfig.platforms b/arch/arm64/Kconfig.platforms
index 715ef1256838..0786e3e0f5c6 100644
--- a/arch/arm64/Kconfig.platforms
+++ b/arch/arm64/Kconfig.platforms
@@ -105,6 +105,8 @@ config ARCH_MVEBU
 	select ARMADA_37XX_CLK
 	select MVEBU_ODMI
 	select MVEBU_PIC
+	select PINCTRL
+	select PINCTRL_ARMADA_37XX
 	help
 	  This enables support for Marvell EBU familly, including:
 	   - Armada 3700 SoC Family
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index 25d50a86981d..b89659b5bfa9 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -44,7 +44,7 @@ obj-y				+= bcm/
 obj-$(CONFIG_PINCTRL_BERLIN)	+= berlin/
 obj-y				+= freescale/
 obj-$(CONFIG_X86)		+= intel/
-obj-$(CONFIG_PINCTRL_MVEBU)	+= mvebu/
+obj-y				+= mvebu/
 obj-y				+= nomadik/
 obj-$(CONFIG_PINCTRL_PXA)	+= pxa/
 obj-$(CONFIG_ARCH_QCOM)		+= qcom/
diff --git a/drivers/pinctrl/mvebu/Kconfig b/drivers/pinctrl/mvebu/Kconfig
index 170602407c0d..98fcf1290acd 100644
--- a/drivers/pinctrl/mvebu/Kconfig
+++ b/drivers/pinctrl/mvebu/Kconfig
@@ -39,3 +39,10 @@ config PINCTRL_ORION
 	select PINCTRL_MVEBU
 
 endif
+
+config PINCTRL_ARMADA_37XX
+       bool
+       select PINMUX
+       select PINCONF
+       select GENERIC_PINCONF
+
diff --git a/drivers/pinctrl/mvebu/Makefile b/drivers/pinctrl/mvebu/Makefile
index 18270cd5ea43..60c245a60f39 100644
--- a/drivers/pinctrl/mvebu/Makefile
+++ b/drivers/pinctrl/mvebu/Makefile
@@ -1,4 +1,4 @@
-obj-y				+= pinctrl-mvebu.o
+obj-$(CONFIG_PINCTRL_MVEBU)	+= pinctrl-mvebu.o
 obj-$(CONFIG_PINCTRL_DOVE)	+= pinctrl-dove.o
 obj-$(CONFIG_PINCTRL_KIRKWOOD)	+= pinctrl-kirkwood.o
 obj-$(CONFIG_PINCTRL_ARMADA_370) += pinctrl-armada-370.o
@@ -6,4 +6,5 @@ obj-$(CONFIG_PINCTRL_ARMADA_375) += pinctrl-armada-375.o
 obj-$(CONFIG_PINCTRL_ARMADA_38X) += pinctrl-armada-38x.o
 obj-$(CONFIG_PINCTRL_ARMADA_39X) += pinctrl-armada-39x.o
 obj-$(CONFIG_PINCTRL_ARMADA_XP)  += pinctrl-armada-xp.o
+obj-$(CONFIG_PINCTRL_ARMADA_37XX)  += pinctrl-armada-37xx.o
 obj-$(CONFIG_PINCTRL_ORION)  += pinctrl-orion.o
diff --git a/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c b/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c
new file mode 100644
index 000000000000..021bfe793af3
--- /dev/null
+++ b/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c
@@ -0,0 +1,590 @@
+/*
+ * Marvell 37xx SoC pinctrl driver
+ *
+ * Copyright (C) 2016 Marvell
+ *
+ * Gregory CLEMENT <gregory.clement@free-electrons.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2 or later. This program is licensed "as is"
+ * without any warranty of any kind, whether express or implied.
+ */
+
+#include <linux/mfd/syscon.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#include "../pinctrl-utils.h"
+
+#define OUTPUT_EN	0x0
+#define OUTPUT_CTL	0x20
+#define SELECTION	0x30
+
+static int global_pin;
+
+#define NB_FUNCS 2
+#define GPIO_PER_REG	32
+
+struct armada_37xx_pin_group {
+	const char	*name;
+	unsigned int	start_pin;
+	unsigned int	npins;
+	u32		reg_mask;
+	unsigned int	extra_pin;
+	unsigned int	extra_npins;
+	const char	*funcs[NB_FUNCS];
+	unsigned int	*pins;
+};
+
+struct armada_37xx_pin_data {
+	u8				nr_pins;
+	char				*name;
+	struct armada_37xx_pin_group	*groups;
+	int				ngroups;
+};
+
+struct armada_37xx_pmx_func {
+	const char		*name;
+	const char		**groups;
+	unsigned int		ngroups;
+};
+
+struct armada_37xx_pinctrl {
+	struct regmap			*regmap;
+	struct armada_37xx_pin_data	*data;
+	struct device			*dev;
+	struct pinctrl_desc		pctl;
+	struct pinctrl_dev		*pctl_dev;
+	struct armada_37xx_pin_group	*groups;
+	unsigned int			ngroups;
+	struct armada_37xx_pmx_func	*funcs;
+	unsigned int			nfuncs;
+};
+
+#define PIN_GRP(_name, _start, _nr, _mask, _func1, _func2)	\
+	{					\
+		.name = _name,			\
+		.start_pin = _start,		\
+		.npins = _nr,			\
+		.reg_mask = _mask,		\
+		.funcs = {_func1, _func2}	\
+	}
+
+#define PIN_GRP_GPIO(_name, _start, _nr, _mask, _func1)	\
+	{					\
+		.name = _name,			\
+		.start_pin = _start,		\
+		.npins = _nr,			\
+		.reg_mask = _mask,		\
+		.funcs = {_func1, "gpio"}	\
+	}
+
+#define PIN_GRP_EXTRA(_name, _start, _nr, _mask, _start2, _nr2, _f1, _f2) \
+	{						\
+		.name = _name,				\
+		.start_pin = _start,			\
+		.npins = _nr,				\
+		.reg_mask = _mask,			\
+		.extra_pin = _start2,			\
+		.extra_npins = _nr2,			\
+		.funcs = {_f1, _f2}			\
+	}
+
+static struct armada_37xx_pin_group armada_37xx_nb_groups[] = {
+	PIN_GRP_GPIO("jtag", 20, 5, BIT(0), "jtag"),
+	PIN_GRP_GPIO("sdio0", 8, 3, BIT(1), "sdio"),
+	PIN_GRP_GPIO("emmc_nb", 27, 9, BIT(2), "emmc"),
+	PIN_GRP_GPIO("pwm0", 11, 1, BIT(3), "pwm"),
+	PIN_GRP_GPIO("pwm1", 12, 1, BIT(4), "pwm"),
+	PIN_GRP_GPIO("pwm2", 13, 1, BIT(5), "pwm"),
+	PIN_GRP_GPIO("pwm3", 14, 1, BIT(6), "pwm"),
+	PIN_GRP_GPIO("pmic1", 17, 1, BIT(7), "pmic"),
+	PIN_GRP_GPIO("pmic0", 16, 1, BIT(8), "pmic"),
+	PIN_GRP_GPIO("i2c2", 2, 2, BIT(9), "i2c"),
+	PIN_GRP_GPIO("i2c1", 0, 2, BIT(10), "i2c"),
+	PIN_GRP_GPIO("spi_cs1", 17, 1, BIT(12), "spi"),
+	PIN_GRP_GPIO("spi_cs2", 18, 1, BIT(13), "spi"),
+	PIN_GRP_GPIO("spi_cs3", 19, 1, BIT(14), "spi"),
+	PIN_GRP_GPIO("onewire", 4, 1, BIT(16), "onewire"),
+	PIN_GRP_GPIO("uart1", 25, 2, BIT(17), "uart"),
+	PIN_GRP_GPIO("spi_quad", 15, 2, BIT(18), "spi"),
+	PIN_GRP_EXTRA("uart_2", 9, 2, BIT(19), 18, 2, "gpio", "uart"),
+};
+
+static struct armada_37xx_pin_group armada_37xx_sb_groups[] = {
+	PIN_GRP_GPIO("usb32_drvvbus0", 0, 1, BIT(0), "drvbus"),
+	PIN_GRP_GPIO("usb2_drvvbus1", 1, 1, BIT(1), "drvbus"),
+	PIN_GRP_GPIO("sdio_sb", 24, 5, BIT(2), "sdio"),
+	PIN_GRP_EXTRA("rgmii", 6, 14, BIT(3), 23, 1, "mii", "gpio"),
+	PIN_GRP_GPIO("pcie1", 3, 2, BIT(4), "pcie"),
+	PIN_GRP_GPIO("ptp", 20, 3, BIT(5), "ptp"),
+	PIN_GRP("ptp_clk", 21, 1, BIT(6), "ptp", "mii"),
+	PIN_GRP("ptp_trig", 22, 1, BIT(7), "ptp", "mii"),
+	PIN_GRP("mii_col", 23, 1, BIT(8), "mii", "mii_err"),
+};
+
+struct armada_37xx_pin_data armada_37xx_pin_nb = {
+	.nr_pins = 36,
+	.name = "GPIO1",
+	.groups = armada_37xx_nb_groups,
+	.ngroups = ARRAY_SIZE(armada_37xx_nb_groups),
+};
+
+struct armada_37xx_pin_data armada_37xx_pin_sb = {
+	.nr_pins = 29,
+	.name = "GPIO2",
+	.groups = armada_37xx_sb_groups,
+	.ngroups = ARRAY_SIZE(armada_37xx_sb_groups),
+};
+
+static int armada_37xx_get_func_reg(struct armada_37xx_pin_group *grp,
+				    const char *func)
+{
+	int f;
+
+	for (f = 0; f < NB_FUNCS; f++)
+		if (!strcmp(grp->funcs[f], func))
+			return f;
+
+	return -ENOTSUPP;
+}
+
+static struct armada_37xx_pin_group *armada_37xx_find_next_grp_by_pin(
+	struct armada_37xx_pinctrl *info, int pin, int *grp)
+{
+	while (*grp < info->ngroups) {
+		struct armada_37xx_pin_group *group = &info->groups[*grp];
+		int j;
+
+		*grp = *grp + 1;
+		for (j = 0; j < (group->npins + group->extra_npins); j++)
+			if (group->pins[j] == pin)
+				return group;
+	}
+	return NULL;
+}
+
+static int armada_37xx_pin_config_group_get(struct pinctrl_dev *pctldev,
+			    unsigned int selector, unsigned long *config)
+{
+	return -ENOTSUPP;
+}
+
+static int armada_37xx_pin_config_group_set(struct pinctrl_dev *pctldev,
+			    unsigned int selector, unsigned long *configs,
+			    unsigned int num_configs)
+{
+	return -ENOTSUPP;
+}
+
+static struct pinconf_ops armada_37xx_pinconf_ops = {
+	.is_generic = true,
+	.pin_config_group_get = armada_37xx_pin_config_group_get,
+	.pin_config_group_set = armada_37xx_pin_config_group_set,
+};
+
+static int armada_37xx_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+
+	return info->ngroups;
+}
+
+static const char *armada_37xx_get_group_name(struct pinctrl_dev *pctldev,
+					      unsigned int group)
+{
+	struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+
+	return info->groups[group].name;
+}
+
+static int armada_37xx_get_group_pins(struct pinctrl_dev *pctldev,
+				      unsigned int selector,
+				      const unsigned int **pins,
+				      unsigned int *npins)
+{
+	struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+
+	if (selector >= info->ngroups)
+		return -EINVAL;
+
+	*pins = info->groups[selector].pins;
+	*npins = info->groups[selector].npins;
+
+	return 0;
+}
+
+static const struct pinctrl_ops armada_37xx_pctrl_ops = {
+	.get_groups_count	= armada_37xx_get_groups_count,
+	.get_group_name		= armada_37xx_get_group_name,
+	.get_group_pins		= armada_37xx_get_group_pins,
+	.dt_node_to_map		= pinconf_generic_dt_node_to_map_group,
+	.dt_free_map		= pinctrl_utils_free_map,
+};
+
+/*
+ * Pinmux_ops handling
+ */
+
+static int armada_37xx_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
+{
+	struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+
+	return info->nfuncs;
+}
+
+static const char *armada_37xx_pmx_get_func_name(struct pinctrl_dev *pctldev,
+						 unsigned int selector)
+{
+	struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+
+	return info->funcs[selector].name;
+}
+
+static int armada_37xx_pmx_get_groups(struct pinctrl_dev *pctldev,
+				      unsigned int selector,
+				      const char * const **groups,
+				      unsigned int * const num_groups)
+{
+	struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+
+	*groups = info->funcs[selector].groups;
+	*num_groups = info->funcs[selector].ngroups;
+
+	return 0;
+}
+
+static int armada_37xx_pmx_set_by_name(struct pinctrl_dev *pctldev,
+				       const char *name,
+				       struct armada_37xx_pin_group *grp)
+{
+	struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+	unsigned int reg = SELECTION;
+	unsigned int mask = grp->reg_mask;
+	int ret, val;
+
+	dev_dbg(info->dev, "enable function %s group %s\n",
+		name, grp->name);
+
+	ret = armada_37xx_get_func_reg(grp, name);
+
+	if (ret < 0)
+		return ret;
+
+	val = ret ? mask : 0;
+
+	regmap_update_bits(info->regmap, reg, mask, val);
+
+	return 0;
+}
+
+static int armada_37xx_pmx_set(struct pinctrl_dev *pctldev,
+			       unsigned int selector,
+			       unsigned int group)
+{
+
+	struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+	struct armada_37xx_pin_group *grp = &info->groups[group];
+	const char *name = info->funcs[selector].name;
+
+	return armada_37xx_pmx_set_by_name(pctldev, name, grp);
+}
+
+static int armada_37xx_pmx_direction_input(struct armada_37xx_pinctrl *info,
+					   unsigned int offset)
+{
+	unsigned int reg = OUTPUT_EN;
+	unsigned int mask;
+
+	if (offset >= GPIO_PER_REG) {
+		offset -= GPIO_PER_REG;
+		reg += sizeof(u32);
+	}
+	mask = BIT(offset);
+
+	return regmap_update_bits(info->regmap, reg, mask, 0);
+}
+
+
+
+static int armada_37xx_pmx_direction_output(struct armada_37xx_pinctrl *info,
+					    unsigned int offset, int value)
+{
+	unsigned int reg = OUTPUT_EN;
+	unsigned int mask;
+
+	if (offset >= GPIO_PER_REG) {
+		offset -= GPIO_PER_REG;
+		reg += sizeof(u32);
+	}
+	mask = BIT(offset);
+
+	return regmap_update_bits(info->regmap, reg, mask, mask);
+}
+
+static int armada_37xx_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
+					      struct pinctrl_gpio_range *range,
+					      unsigned int offset, bool input)
+{
+	struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+
+	dev_dbg(info->dev, "gpio_direction for pin %u as %s-%d to %s\n",
+		offset, range->name, offset, input ? "input" : "output");
+
+	if (input)
+		armada_37xx_pmx_direction_input(info, offset);
+	else
+		armada_37xx_pmx_direction_output(info, offset, 0);
+
+	return 0;
+}
+
+static int armada_37xx_gpio_request_enable(struct pinctrl_dev *pctldev,
+					   struct pinctrl_gpio_range *range,
+					   unsigned int offset)
+{
+	struct armada_37xx_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+	struct armada_37xx_pin_group *group;
+	int grp = 0;
+
+	dev_dbg(info->dev, "requesting gpio %d\n", offset);
+
+	while ((group = armada_37xx_find_next_grp_by_pin(info, offset, &grp)))
+		armada_37xx_pmx_set_by_name(pctldev, "gpio", group);
+
+	return 0;
+}
+
+static const struct pinmux_ops armada_37xx_pmx_ops = {
+	.get_functions_count	= armada_37xx_pmx_get_funcs_count,
+	.get_function_name	= armada_37xx_pmx_get_func_name,
+	.get_function_groups	= armada_37xx_pmx_get_groups,
+	.set_mux		= armada_37xx_pmx_set,
+	.gpio_request_enable	= armada_37xx_gpio_request_enable,
+	.gpio_set_direction	= armada_37xx_pmx_gpio_set_direction,
+};
+
+static int _add_function(struct armada_37xx_pmx_func *funcs, int *funcsize,
+			 const char *name)
+{
+	int i = 0;
+
+	if (*funcsize <= 0)
+		return -EOVERFLOW;
+
+	while (funcs->ngroups) {
+		/* function already there */
+		if (strcmp(funcs->name, name) == 0) {
+			funcs->ngroups++;
+
+			return -EEXIST;
+		}
+		funcs++;
+		i++;
+	}
+
+	/* append new unique function */
+	funcs->name = name;
+	funcs->ngroups = 1;
+	(*funcsize)--;
+
+	return 0;
+}
+
+static int armada_37xx_fill_group(struct armada_37xx_pinctrl *info, int base)
+{
+	int n, num = 0, funcsize = info->data->nr_pins;
+
+	for (n = 0; n < info->ngroups; n++) {
+		struct armada_37xx_pin_group *grp = &info->groups[n];
+		int i, j, f;
+
+		grp->pins = devm_kzalloc(info->dev,
+					 (grp->npins + grp->extra_npins) *
+					 sizeof(*grp->pins), GFP_KERNEL);
+		if (!grp->pins)
+			return -ENOMEM;
+
+		for (i = 0; i < grp->npins; i++)
+			grp->pins[i] = grp->start_pin + base + i;
+
+		for (j = 0; j < grp->extra_npins; j++)
+			grp->pins[i+j] = grp->extra_pin + base + j;
+
+		for (f = 0; f < NB_FUNCS; f++) {
+			int ret;
+			/* check for unique functions and count groups */
+			ret = _add_function(info->funcs, &funcsize,
+					    grp->funcs[f]);
+			if (ret == -EOVERFLOW)
+				dev_err(info->dev,
+					"More functions than pins(%d)\n",
+					info->data->nr_pins);
+			if (ret < 0)
+				continue;
+			num++;
+		}
+	}
+
+	info->nfuncs = num;
+
+	return 0;
+}
+
+static int armada_37xx_fill_func(struct armada_37xx_pinctrl *info)
+{
+	struct armada_37xx_pmx_func *funcs = info->funcs;
+	int n;
+
+	for (n = 0; n < info->nfuncs; n++) {
+		const char *name = funcs[n].name;
+		const char **groups;
+		int g;
+
+		funcs[n].groups = devm_kzalloc(info->dev, funcs[n].ngroups *
+					       sizeof(*(funcs[n].groups)),
+					       GFP_KERNEL);
+		if (!funcs[n].groups)
+			return -ENOMEM;
+
+		groups = funcs[n].groups;
+
+		for (g = 0; g < info->ngroups; g++) {
+			struct armada_37xx_pin_group *gp = &info->groups[g];
+			int f;
+
+			for (f = 0; f < NB_FUNCS; f++) {
+				if (strcmp(gp->funcs[f], name) == 0) {
+					*groups = gp->name;
+					groups++;
+				}
+			}
+		}
+	}
+	return 0;
+}
+
+static int armada_37xx_pinctrl_register(struct platform_device *pdev,
+					struct armada_37xx_pinctrl *info)
+{
+	struct armada_37xx_pin_data *pin_data = info->data;
+	struct pinctrl_desc *ctrldesc = &info->pctl;
+	struct pinctrl_pin_desc *pindesc, *pdesc;
+	int base_pin = global_pin;
+	int pin, ret;
+
+	info->groups = pin_data->groups;
+	info->ngroups = pin_data->ngroups;
+
+	ctrldesc->name = "armada_37xx-pinctrl";
+	ctrldesc->owner = THIS_MODULE;
+	ctrldesc->pctlops = &armada_37xx_pctrl_ops;
+	ctrldesc->pmxops = &armada_37xx_pmx_ops;
+	ctrldesc->confops = &armada_37xx_pinconf_ops;
+
+	pindesc = devm_kzalloc(&pdev->dev, sizeof(*pindesc) *
+			       pin_data->nr_pins, GFP_KERNEL);
+	if (!pindesc)
+		return -ENOMEM;
+
+	ctrldesc->pins = pindesc;
+	ctrldesc->npins = pin_data->nr_pins;
+
+	pdesc = pindesc;
+	for (pin = 0; pin < pin_data->nr_pins; pin++, global_pin++) {
+		pdesc->number = global_pin;
+		pdesc->name = kasprintf(GFP_KERNEL, "%s-%d",
+					pin_data->name, pin);
+		pdesc++;
+	}
+
+	/*
+	 * we allocate functions for number of pins and hope there are
+	 * fewer unique functions than pins available
+	 */
+	info->funcs = devm_kzalloc(&pdev->dev, pin_data->nr_pins *
+			   sizeof(struct armada_37xx_pmx_func), GFP_KERNEL);
+	if (!info->funcs)
+		return -ENOMEM;
+
+
+	ret = armada_37xx_fill_group(info, base_pin);
+	if (ret)
+		return ret;
+
+	ret = armada_37xx_fill_func(info);
+	if (ret)
+		return ret;
+
+	info->pctl_dev = devm_pinctrl_register(&pdev->dev, ctrldesc, info);
+	if (IS_ERR(info->pctl_dev)) {
+		dev_err(&pdev->dev, "could not register pinctrl driver\n");
+		return PTR_ERR(info->pctl_dev);
+	}
+
+	return 0;
+}
+
+static const struct of_device_id armada_37xx_pinctrl_of_match[] = {
+	{
+		.compatible = "marvell,armada3710-sb-pinctrl",
+		.data = (void *)&armada_37xx_pin_sb,
+	},
+	{
+		.compatible = "marvell,armada3710-nb-pinctrl",
+		.data = (void *)&armada_37xx_pin_nb,
+	},
+	{ },
+};
+
+static int armada_37xx_pinctrl_probe(struct platform_device *pdev)
+{
+	const struct of_device_id *match;
+	struct armada_37xx_pinctrl *info;
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct regmap *regmap;
+	int ret;
+
+	info = devm_kzalloc(dev, sizeof(struct armada_37xx_pinctrl),
+			    GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	info->dev = dev;
+
+	regmap = syscon_node_to_regmap(np);
+	if (IS_ERR(regmap)) {
+		dev_err(&pdev->dev, "cannot get regmap\n");
+		return PTR_ERR(regmap);
+	}
+	info->regmap = regmap;
+
+	match = of_match_node(armada_37xx_pinctrl_of_match, np);
+	info->data = (struct armada_37xx_pin_data *)match->data;
+
+	ret = armada_37xx_pinctrl_register(pdev, info);
+	if (ret)
+		return ret;
+
+	platform_set_drvdata(pdev, info);
+
+	return 0;
+}
+
+static struct platform_driver armada_37xx_pinctrl_driver = {
+	.driver = {
+		.name = "armada-37xx-pinctrl",
+		.of_match_table = armada_37xx_pinctrl_of_match,
+	},
+	.probe = armada_37xx_pinctrl_probe,
+};
+
+builtin_platform_driver(armada_37xx_pinctrl_driver);
-- 
2.11.0