Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1266 insertions, 0 deletions

diff --git a/drivers/pinctrl/pinctrl-sx150x.c b/drivers/pinctrl/pinctrl-sx150x.c
new file mode 100644
index 000000000..484a3b9e8
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-sx150x.c
@@ -0,0 +1,1266 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2016, BayLibre, SAS. All rights reserved.
+ * Author: Neil Armstrong <narmstrong@baylibre.com>
+ *
+ * Copyright (c) 2010, Code Aurora Forum. All rights reserved.
+ *
+ * Driver for Semtech SX150X I2C GPIO Expanders
+ * The handling of the 4-bit chips (SX1501/SX1504/SX1507) is untested.
+ *
+ * Author: Gregory Bean <gbean@codeaurora.org>
+ */
+
+#include <linux/regmap.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/gpio/driver.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf-generic.h>
+
+#include "core.h"
+#include "pinconf.h"
+#include "pinctrl-utils.h"
+
+/* The chip models of sx150x */
+enum {
+	SX150X_123 = 0,
+	SX150X_456,
+	SX150X_789,
+};
+enum {
+	SX150X_789_REG_MISC_AUTOCLEAR_OFF = 1 << 0,
+	SX150X_MAX_REGISTER = 0xad,
+	SX150X_IRQ_TYPE_EDGE_RISING = 0x1,
+	SX150X_IRQ_TYPE_EDGE_FALLING = 0x2,
+	SX150X_789_RESET_KEY1 = 0x12,
+	SX150X_789_RESET_KEY2 = 0x34,
+};
+
+struct sx150x_123_pri {
+	u8 reg_pld_mode;
+	u8 reg_pld_table0;
+	u8 reg_pld_table1;
+	u8 reg_pld_table2;
+	u8 reg_pld_table3;
+	u8 reg_pld_table4;
+	u8 reg_advanced;
+};
+
+struct sx150x_456_pri {
+	u8 reg_pld_mode;
+	u8 reg_pld_table0;
+	u8 reg_pld_table1;
+	u8 reg_pld_table2;
+	u8 reg_pld_table3;
+	u8 reg_pld_table4;
+	u8 reg_advanced;
+};
+
+struct sx150x_789_pri {
+	u8 reg_drain;
+	u8 reg_polarity;
+	u8 reg_clock;
+	u8 reg_misc;
+	u8 reg_reset;
+	u8 ngpios;
+};
+
+struct sx150x_device_data {
+	u8 model;
+	u8 reg_pullup;
+	u8 reg_pulldn;
+	u8 reg_dir;
+	u8 reg_data;
+	u8 reg_irq_mask;
+	u8 reg_irq_src;
+	u8 reg_sense;
+	u8 ngpios;
+	union {
+		struct sx150x_123_pri x123;
+		struct sx150x_456_pri x456;
+		struct sx150x_789_pri x789;
+	} pri;
+	const struct pinctrl_pin_desc *pins;
+	unsigned int npins;
+};
+
+struct sx150x_pinctrl {
+	struct device *dev;
+	struct i2c_client *client;
+	struct pinctrl_dev *pctldev;
+	struct pinctrl_desc pinctrl_desc;
+	struct gpio_chip gpio;
+	struct irq_chip irq_chip;
+	struct regmap *regmap;
+	struct {
+		u32 sense;
+		u32 masked;
+	} irq;
+	struct mutex lock;
+	const struct sx150x_device_data *data;
+};
+
+static const struct pinctrl_pin_desc sx150x_4_pins[] = {
+	PINCTRL_PIN(0, "gpio0"),
+	PINCTRL_PIN(1, "gpio1"),
+	PINCTRL_PIN(2, "gpio2"),
+	PINCTRL_PIN(3, "gpio3"),
+	PINCTRL_PIN(4, "oscio"),
+};
+
+static const struct pinctrl_pin_desc sx150x_8_pins[] = {
+	PINCTRL_PIN(0, "gpio0"),
+	PINCTRL_PIN(1, "gpio1"),
+	PINCTRL_PIN(2, "gpio2"),
+	PINCTRL_PIN(3, "gpio3"),
+	PINCTRL_PIN(4, "gpio4"),
+	PINCTRL_PIN(5, "gpio5"),
+	PINCTRL_PIN(6, "gpio6"),
+	PINCTRL_PIN(7, "gpio7"),
+	PINCTRL_PIN(8, "oscio"),
+};
+
+static const struct pinctrl_pin_desc sx150x_16_pins[] = {
+	PINCTRL_PIN(0, "gpio0"),
+	PINCTRL_PIN(1, "gpio1"),
+	PINCTRL_PIN(2, "gpio2"),
+	PINCTRL_PIN(3, "gpio3"),
+	PINCTRL_PIN(4, "gpio4"),
+	PINCTRL_PIN(5, "gpio5"),
+	PINCTRL_PIN(6, "gpio6"),
+	PINCTRL_PIN(7, "gpio7"),
+	PINCTRL_PIN(8, "gpio8"),
+	PINCTRL_PIN(9, "gpio9"),
+	PINCTRL_PIN(10, "gpio10"),
+	PINCTRL_PIN(11, "gpio11"),
+	PINCTRL_PIN(12, "gpio12"),
+	PINCTRL_PIN(13, "gpio13"),
+	PINCTRL_PIN(14, "gpio14"),
+	PINCTRL_PIN(15, "gpio15"),
+	PINCTRL_PIN(16, "oscio"),
+};
+
+static const struct sx150x_device_data sx1501q_device_data = {
+	.model = SX150X_123,
+	.reg_pullup	= 0x02,
+	.reg_pulldn	= 0x03,
+	.reg_dir	= 0x01,
+	.reg_data	= 0x00,
+	.reg_irq_mask	= 0x05,
+	.reg_irq_src	= 0x08,
+	.reg_sense	= 0x07,
+	.pri.x123 = {
+		.reg_pld_mode	= 0x10,
+		.reg_pld_table0	= 0x11,
+		.reg_pld_table2	= 0x13,
+		.reg_advanced	= 0xad,
+	},
+	.ngpios	= 4,
+	.pins = sx150x_4_pins,
+	.npins = 4, /* oscio not available */
+};
+
+static const struct sx150x_device_data sx1502q_device_data = {
+	.model = SX150X_123,
+	.reg_pullup	= 0x02,
+	.reg_pulldn	= 0x03,
+	.reg_dir	= 0x01,
+	.reg_data	= 0x00,
+	.reg_irq_mask	= 0x05,
+	.reg_irq_src	= 0x08,
+	.reg_sense	= 0x06,
+	.pri.x123 = {
+		.reg_pld_mode	= 0x10,
+		.reg_pld_table0	= 0x11,
+		.reg_pld_table1	= 0x12,
+		.reg_pld_table2	= 0x13,
+		.reg_pld_table3	= 0x14,
+		.reg_pld_table4	= 0x15,
+		.reg_advanced	= 0xad,
+	},
+	.ngpios	= 8,
+	.pins = sx150x_8_pins,
+	.npins = 8, /* oscio not available */
+};
+
+static const struct sx150x_device_data sx1503q_device_data = {
+	.model = SX150X_123,
+	.reg_pullup	= 0x04,
+	.reg_pulldn	= 0x06,
+	.reg_dir	= 0x02,
+	.reg_data	= 0x00,
+	.reg_irq_mask	= 0x08,
+	.reg_irq_src	= 0x0e,
+	.reg_sense	= 0x0a,
+	.pri.x123 = {
+		.reg_pld_mode	= 0x20,
+		.reg_pld_table0	= 0x22,
+		.reg_pld_table1	= 0x24,
+		.reg_pld_table2	= 0x26,
+		.reg_pld_table3	= 0x28,
+		.reg_pld_table4	= 0x2a,
+		.reg_advanced	= 0xad,
+	},
+	.ngpios	= 16,
+	.pins = sx150x_16_pins,
+	.npins  = 16, /* oscio not available */
+};
+
+static const struct sx150x_device_data sx1504q_device_data = {
+	.model = SX150X_456,
+	.reg_pullup	= 0x02,
+	.reg_pulldn	= 0x03,
+	.reg_dir	= 0x01,
+	.reg_data	= 0x00,
+	.reg_irq_mask	= 0x05,
+	.reg_irq_src	= 0x08,
+	.reg_sense	= 0x07,
+	.pri.x456 = {
+		.reg_pld_mode	= 0x10,
+		.reg_pld_table0	= 0x11,
+		.reg_pld_table2	= 0x13,
+	},
+	.ngpios	= 4,
+	.pins = sx150x_4_pins,
+	.npins = 4, /* oscio not available */
+};
+
+static const struct sx150x_device_data sx1505q_device_data = {
+	.model = SX150X_456,
+	.reg_pullup	= 0x02,
+	.reg_pulldn	= 0x03,
+	.reg_dir	= 0x01,
+	.reg_data	= 0x00,
+	.reg_irq_mask	= 0x05,
+	.reg_irq_src	= 0x08,
+	.reg_sense	= 0x06,
+	.pri.x456 = {
+		.reg_pld_mode	= 0x10,
+		.reg_pld_table0	= 0x11,
+		.reg_pld_table1	= 0x12,
+		.reg_pld_table2	= 0x13,
+		.reg_pld_table3	= 0x14,
+		.reg_pld_table4	= 0x15,
+	},
+	.ngpios	= 8,
+	.pins = sx150x_8_pins,
+	.npins = 8, /* oscio not available */
+};
+
+static const struct sx150x_device_data sx1506q_device_data = {
+	.model = SX150X_456,
+	.reg_pullup	= 0x04,
+	.reg_pulldn	= 0x06,
+	.reg_dir	= 0x02,
+	.reg_data	= 0x00,
+	.reg_irq_mask	= 0x08,
+	.reg_irq_src	= 0x0e,
+	.reg_sense	= 0x0a,
+	.pri.x456 = {
+		.reg_pld_mode	= 0x20,
+		.reg_pld_table0	= 0x22,
+		.reg_pld_table1	= 0x24,
+		.reg_pld_table2	= 0x26,
+		.reg_pld_table3	= 0x28,
+		.reg_pld_table4	= 0x2a,
+		.reg_advanced	= 0xad,
+	},
+	.ngpios	= 16,
+	.pins = sx150x_16_pins,
+	.npins = 16, /* oscio not available */
+};
+
+static const struct sx150x_device_data sx1507q_device_data = {
+	.model = SX150X_789,
+	.reg_pullup	= 0x03,
+	.reg_pulldn	= 0x04,
+	.reg_dir	= 0x07,
+	.reg_data	= 0x08,
+	.reg_irq_mask	= 0x09,
+	.reg_irq_src	= 0x0b,
+	.reg_sense	= 0x0a,
+	.pri.x789 = {
+		.reg_drain	= 0x05,
+		.reg_polarity	= 0x06,
+		.reg_clock	= 0x0d,
+		.reg_misc	= 0x0e,
+		.reg_reset	= 0x7d,
+	},
+	.ngpios = 4,
+	.pins = sx150x_4_pins,
+	.npins = ARRAY_SIZE(sx150x_4_pins),
+};
+
+static const struct sx150x_device_data sx1508q_device_data = {
+	.model = SX150X_789,
+	.reg_pullup	= 0x03,
+	.reg_pulldn	= 0x04,
+	.reg_dir	= 0x07,
+	.reg_data	= 0x08,
+	.reg_irq_mask	= 0x09,
+	.reg_irq_src	= 0x0c,
+	.reg_sense	= 0x0a,
+	.pri.x789 = {
+		.reg_drain	= 0x05,
+		.reg_polarity	= 0x06,
+		.reg_clock	= 0x0f,
+		.reg_misc	= 0x10,
+		.reg_reset	= 0x7d,
+	},
+	.ngpios = 8,
+	.pins = sx150x_8_pins,
+	.npins = ARRAY_SIZE(sx150x_8_pins),
+};
+
+static const struct sx150x_device_data sx1509q_device_data = {
+	.model = SX150X_789,
+	.reg_pullup	= 0x06,
+	.reg_pulldn	= 0x08,
+	.reg_dir	= 0x0e,
+	.reg_data	= 0x10,
+	.reg_irq_mask	= 0x12,
+	.reg_irq_src	= 0x18,
+	.reg_sense	= 0x14,
+	.pri.x789 = {
+		.reg_drain	= 0x0a,
+		.reg_polarity	= 0x0c,
+		.reg_clock	= 0x1e,
+		.reg_misc	= 0x1f,
+		.reg_reset	= 0x7d,
+	},
+	.ngpios	= 16,
+	.pins = sx150x_16_pins,
+	.npins = ARRAY_SIZE(sx150x_16_pins),
+};
+
+static int sx150x_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	return 0;
+}
+
+static const char *sx150x_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
+						unsigned int group)
+{
+	return NULL;
+}
+
+static int sx150x_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
+					unsigned int group,
+					const unsigned int **pins,
+					unsigned int *num_pins)
+{
+	return -ENOTSUPP;
+}
+
+static const struct pinctrl_ops sx150x_pinctrl_ops = {
+	.get_groups_count = sx150x_pinctrl_get_groups_count,
+	.get_group_name = sx150x_pinctrl_get_group_name,
+	.get_group_pins = sx150x_pinctrl_get_group_pins,
+#ifdef CONFIG_OF
+	.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
+	.dt_free_map = pinctrl_utils_free_map,
+#endif
+};
+
+static bool sx150x_pin_is_oscio(struct sx150x_pinctrl *pctl, unsigned int pin)
+{
+	if (pin >= pctl->data->npins)
+		return false;
+
+	/* OSCIO pin is only present in 789 devices */
+	if (pctl->data->model != SX150X_789)
+		return false;
+
+	return !strcmp(pctl->data->pins[pin].name, "oscio");
+}
+
+static int sx150x_gpio_get_direction(struct gpio_chip *chip,
+				      unsigned int offset)
+{
+	struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
+	unsigned int value;
+	int ret;
+
+	if (sx150x_pin_is_oscio(pctl, offset))
+		return GPIO_LINE_DIRECTION_OUT;
+
+	ret = regmap_read(pctl->regmap, pctl->data->reg_dir, &value);
+	if (ret < 0)
+		return ret;
+
+	if (value & BIT(offset))
+		return GPIO_LINE_DIRECTION_IN;
+
+	return GPIO_LINE_DIRECTION_OUT;
+}
+
+static int sx150x_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+	struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
+	unsigned int value;
+	int ret;
+
+	if (sx150x_pin_is_oscio(pctl, offset))
+		return -EINVAL;
+
+	ret = regmap_read(pctl->regmap, pctl->data->reg_data, &value);
+	if (ret < 0)
+		return ret;
+
+	return !!(value & BIT(offset));
+}
+
+static int __sx150x_gpio_set(struct sx150x_pinctrl *pctl, unsigned int offset,
+			     int value)
+{
+	return regmap_write_bits(pctl->regmap, pctl->data->reg_data,
+				 BIT(offset), value ? BIT(offset) : 0);
+}
+
+static int sx150x_gpio_oscio_set(struct sx150x_pinctrl *pctl,
+				 int value)
+{
+	return regmap_write(pctl->regmap,
+			    pctl->data->pri.x789.reg_clock,
+			    (value ? 0x1f : 0x10));
+}
+
+static void sx150x_gpio_set(struct gpio_chip *chip, unsigned int offset,
+			    int value)
+{
+	struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
+
+	if (sx150x_pin_is_oscio(pctl, offset))
+		sx150x_gpio_oscio_set(pctl, value);
+	else
+		__sx150x_gpio_set(pctl, offset, value);
+}
+
+static void sx150x_gpio_set_multiple(struct gpio_chip *chip,
+				     unsigned long *mask,
+				     unsigned long *bits)
+{
+	struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
+
+	regmap_write_bits(pctl->regmap, pctl->data->reg_data, *mask, *bits);
+}
+
+static int sx150x_gpio_direction_input(struct gpio_chip *chip,
+				       unsigned int offset)
+{
+	struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
+
+	if (sx150x_pin_is_oscio(pctl, offset))
+		return -EINVAL;
+
+	return regmap_write_bits(pctl->regmap,
+				 pctl->data->reg_dir,
+				 BIT(offset), BIT(offset));
+}
+
+static int sx150x_gpio_direction_output(struct gpio_chip *chip,
+					unsigned int offset, int value)
+{
+	struct sx150x_pinctrl *pctl = gpiochip_get_data(chip);
+	int ret;
+
+	if (sx150x_pin_is_oscio(pctl, offset))
+		return sx150x_gpio_oscio_set(pctl, value);
+
+	ret = __sx150x_gpio_set(pctl, offset, value);
+	if (ret < 0)
+		return ret;
+
+	return regmap_write_bits(pctl->regmap,
+				 pctl->data->reg_dir,
+				 BIT(offset), 0);
+}
+
+static void sx150x_irq_mask(struct irq_data *d)
+{
+	struct sx150x_pinctrl *pctl =
+			gpiochip_get_data(irq_data_get_irq_chip_data(d));
+	unsigned int n = d->hwirq;
+
+	pctl->irq.masked |= BIT(n);
+}
+
+static void sx150x_irq_unmask(struct irq_data *d)
+{
+	struct sx150x_pinctrl *pctl =
+			gpiochip_get_data(irq_data_get_irq_chip_data(d));
+	unsigned int n = d->hwirq;
+
+	pctl->irq.masked &= ~BIT(n);
+}
+
+static void sx150x_irq_set_sense(struct sx150x_pinctrl *pctl,
+				 unsigned int line, unsigned int sense)
+{
+	/*
+	 * Every interrupt line is represented by two bits shifted
+	 * proportionally to the line number
+	 */
+	const unsigned int n = line * 2;
+	const unsigned int mask = ~((SX150X_IRQ_TYPE_EDGE_RISING |
+				     SX150X_IRQ_TYPE_EDGE_FALLING) << n);
+
+	pctl->irq.sense &= mask;
+	pctl->irq.sense |= sense << n;
+}
+
+static int sx150x_irq_set_type(struct irq_data *d, unsigned int flow_type)
+{
+	struct sx150x_pinctrl *pctl =
+			gpiochip_get_data(irq_data_get_irq_chip_data(d));
+	unsigned int n, val = 0;
+
+	if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
+		return -EINVAL;
+
+	n = d->hwirq;
+
+	if (flow_type & IRQ_TYPE_EDGE_RISING)
+		val |= SX150X_IRQ_TYPE_EDGE_RISING;
+	if (flow_type & IRQ_TYPE_EDGE_FALLING)
+		val |= SX150X_IRQ_TYPE_EDGE_FALLING;
+
+	sx150x_irq_set_sense(pctl, n, val);
+	return 0;
+}
+
+static irqreturn_t sx150x_irq_thread_fn(int irq, void *dev_id)
+{
+	struct sx150x_pinctrl *pctl = (struct sx150x_pinctrl *)dev_id;
+	unsigned long n, status;
+	unsigned int val;
+	int err;
+
+	err = regmap_read(pctl->regmap, pctl->data->reg_irq_src, &val);
+	if (err < 0)
+		return IRQ_NONE;
+
+	err = regmap_write(pctl->regmap, pctl->data->reg_irq_src, val);
+	if (err < 0)
+		return IRQ_NONE;
+
+	status = val;
+	for_each_set_bit(n, &status, pctl->data->ngpios)
+		handle_nested_irq(irq_find_mapping(pctl->gpio.irq.domain, n));
+
+	return IRQ_HANDLED;
+}
+
+static void sx150x_irq_bus_lock(struct irq_data *d)
+{
+	struct sx150x_pinctrl *pctl =
+			gpiochip_get_data(irq_data_get_irq_chip_data(d));
+
+	mutex_lock(&pctl->lock);
+}
+
+static void sx150x_irq_bus_sync_unlock(struct irq_data *d)
+{
+	struct sx150x_pinctrl *pctl =
+			gpiochip_get_data(irq_data_get_irq_chip_data(d));
+
+	regmap_write(pctl->regmap, pctl->data->reg_irq_mask, pctl->irq.masked);
+	regmap_write(pctl->regmap, pctl->data->reg_sense, pctl->irq.sense);
+	mutex_unlock(&pctl->lock);
+}
+
+static int sx150x_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
+			      unsigned long *config)
+{
+	struct sx150x_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
+	unsigned int param = pinconf_to_config_param(*config);
+	int ret;
+	u32 arg;
+	unsigned int data;
+
+	if (sx150x_pin_is_oscio(pctl, pin)) {
+		switch (param) {
+		case PIN_CONFIG_DRIVE_PUSH_PULL:
+		case PIN_CONFIG_OUTPUT:
+			ret = regmap_read(pctl->regmap,
+					  pctl->data->pri.x789.reg_clock,
+					  &data);
+			if (ret < 0)
+				return ret;
+
+			if (param == PIN_CONFIG_DRIVE_PUSH_PULL)
+				arg = (data & 0x1f) ? 1 : 0;
+			else {
+				if ((data & 0x1f) == 0x1f)
+					arg = 1;
+				else if ((data & 0x1f) == 0x10)
+					arg = 0;
+				else
+					return -EINVAL;
+			}
+
+			break;
+		default:
+			return -ENOTSUPP;
+		}
+
+		goto out;
+	}
+
+	switch (param) {
+	case PIN_CONFIG_BIAS_PULL_DOWN:
+		ret = regmap_read(pctl->regmap,
+				  pctl->data->reg_pulldn,
+				  &data);
+		data &= BIT(pin);
+
+		if (ret < 0)
+			return ret;
+
+		if (!ret)
+			return -EINVAL;
+
+		arg = 1;
+		break;
+
+	case PIN_CONFIG_BIAS_PULL_UP:
+		ret = regmap_read(pctl->regmap,
+				  pctl->data->reg_pullup,
+				  &data);
+		data &= BIT(pin);
+
+		if (ret < 0)
+			return ret;
+
+		if (!ret)
+			return -EINVAL;
+
+		arg = 1;
+		break;
+
+	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+		if (pctl->data->model != SX150X_789)
+			return -ENOTSUPP;
+
+		ret = regmap_read(pctl->regmap,
+				  pctl->data->pri.x789.reg_drain,
+				  &data);
+		data &= BIT(pin);
+
+		if (ret < 0)
+			return ret;
+
+		if (!data)
+			return -EINVAL;
+
+		arg = 1;
+		break;
+
+	case PIN_CONFIG_DRIVE_PUSH_PULL:
+		if (pctl->data->model != SX150X_789)
+			arg = true;
+		else {
+			ret = regmap_read(pctl->regmap,
+					  pctl->data->pri.x789.reg_drain,
+					  &data);
+			data &= BIT(pin);
+
+			if (ret < 0)
+				return ret;
+
+			if (data)
+				return -EINVAL;
+
+			arg = 1;
+		}
+		break;
+
+	case PIN_CONFIG_OUTPUT:
+		ret = sx150x_gpio_get_direction(&pctl->gpio, pin);
+		if (ret < 0)
+			return ret;
+
+		if (ret == GPIO_LINE_DIRECTION_IN)
+			return -EINVAL;
+
+		ret = sx150x_gpio_get(&pctl->gpio, pin);
+		if (ret < 0)
+			return ret;
+
+		arg = ret;
+		break;
+
+	default:
+		return -ENOTSUPP;
+	}
+
+out:
+	*config = pinconf_to_config_packed(param, arg);
+
+	return 0;
+}
+
+static int sx150x_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
+			      unsigned long *configs, unsigned int num_configs)
+{
+	struct sx150x_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
+	enum pin_config_param param;
+	u32 arg;
+	int i;
+	int ret;
+
+	for (i = 0; i < num_configs; i++) {
+		param = pinconf_to_config_param(configs[i]);
+		arg = pinconf_to_config_argument(configs[i]);
+
+		if (sx150x_pin_is_oscio(pctl, pin)) {
+			if (param == PIN_CONFIG_OUTPUT) {
+				ret = sx150x_gpio_direction_output(&pctl->gpio,
+								   pin, arg);
+				if (ret < 0)
+					return ret;
+
+				continue;
+			} else
+				return -ENOTSUPP;
+		}
+
+		switch (param) {
+		case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
+		case PIN_CONFIG_BIAS_DISABLE:
+			ret = regmap_write_bits(pctl->regmap,
+						pctl->data->reg_pulldn,
+						BIT(pin), 0);
+			if (ret < 0)
+				return ret;
+
+			ret = regmap_write_bits(pctl->regmap,
+						pctl->data->reg_pullup,
+						BIT(pin), 0);
+			if (ret < 0)
+				return ret;
+
+			break;
+
+		case PIN_CONFIG_BIAS_PULL_UP:
+			ret = regmap_write_bits(pctl->regmap,
+						pctl->data->reg_pullup,
+						BIT(pin), BIT(pin));
+			if (ret < 0)
+				return ret;
+
+			break;
+
+		case PIN_CONFIG_BIAS_PULL_DOWN:
+			ret = regmap_write_bits(pctl->regmap,
+						pctl->data->reg_pulldn,
+						BIT(pin), BIT(pin));
+			if (ret < 0)
+				return ret;
+
+			break;
+
+		case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+			if (pctl->data->model != SX150X_789 ||
+			    sx150x_pin_is_oscio(pctl, pin))
+				return -ENOTSUPP;
+
+			ret = regmap_write_bits(pctl->regmap,
+						pctl->data->pri.x789.reg_drain,
+						BIT(pin), BIT(pin));
+			if (ret < 0)
+				return ret;
+
+			break;
+
+		case PIN_CONFIG_DRIVE_PUSH_PULL:
+			if (pctl->data->model != SX150X_789 ||
+			    sx150x_pin_is_oscio(pctl, pin))
+				return 0;
+
+			ret = regmap_write_bits(pctl->regmap,
+						pctl->data->pri.x789.reg_drain,
+						BIT(pin), 0);
+			if (ret < 0)
+				return ret;
+
+			break;
+
+		case PIN_CONFIG_OUTPUT:
+			ret = sx150x_gpio_direction_output(&pctl->gpio,
+							   pin, arg);
+			if (ret < 0)
+				return ret;
+
+			break;
+
+		default:
+			return -ENOTSUPP;
+		}
+	} /* for each config */
+
+	return 0;
+}
+
+static const struct pinconf_ops sx150x_pinconf_ops = {
+	.pin_config_get = sx150x_pinconf_get,
+	.pin_config_set = sx150x_pinconf_set,
+	.is_generic = true,
+};
+
+static const struct i2c_device_id sx150x_id[] = {
+	{"sx1501q", (kernel_ulong_t) &sx1501q_device_data },
+	{"sx1502q", (kernel_ulong_t) &sx1502q_device_data },
+	{"sx1503q", (kernel_ulong_t) &sx1503q_device_data },
+	{"sx1504q", (kernel_ulong_t) &sx1504q_device_data },
+	{"sx1505q", (kernel_ulong_t) &sx1505q_device_data },
+	{"sx1506q", (kernel_ulong_t) &sx1506q_device_data },
+	{"sx1507q", (kernel_ulong_t) &sx1507q_device_data },
+	{"sx1508q", (kernel_ulong_t) &sx1508q_device_data },
+	{"sx1509q", (kernel_ulong_t) &sx1509q_device_data },
+	{}
+};
+
+static const struct of_device_id sx150x_of_match[] = {
+	{ .compatible = "semtech,sx1501q", .data = &sx1501q_device_data },
+	{ .compatible = "semtech,sx1502q", .data = &sx1502q_device_data },
+	{ .compatible = "semtech,sx1503q", .data = &sx1503q_device_data },
+	{ .compatible = "semtech,sx1504q", .data = &sx1504q_device_data },
+	{ .compatible = "semtech,sx1505q", .data = &sx1505q_device_data },
+	{ .compatible = "semtech,sx1506q", .data = &sx1506q_device_data },
+	{ .compatible = "semtech,sx1507q", .data = &sx1507q_device_data },
+	{ .compatible = "semtech,sx1508q", .data = &sx1508q_device_data },
+	{ .compatible = "semtech,sx1509q", .data = &sx1509q_device_data },
+	{},
+};
+
+static int sx150x_reset(struct sx150x_pinctrl *pctl)
+{
+	int err;
+
+	err = i2c_smbus_write_byte_data(pctl->client,
+					pctl->data->pri.x789.reg_reset,
+					SX150X_789_RESET_KEY1);
+	if (err < 0)
+		return err;
+
+	err = i2c_smbus_write_byte_data(pctl->client,
+					pctl->data->pri.x789.reg_reset,
+					SX150X_789_RESET_KEY2);
+	return err;
+}
+
+static int sx150x_init_misc(struct sx150x_pinctrl *pctl)
+{
+	u8 reg, value;
+
+	switch (pctl->data->model) {
+	case SX150X_789:
+		reg   = pctl->data->pri.x789.reg_misc;
+		value = SX150X_789_REG_MISC_AUTOCLEAR_OFF;
+		break;
+	case SX150X_456:
+		reg   = pctl->data->pri.x456.reg_advanced;
+		value = 0x00;
+
+		/*
+		 * Only SX1506 has RegAdvanced, SX1504/5 are expected
+		 * to initialize this offset to zero
+		 */
+		if (!reg)
+			return 0;
+		break;
+	case SX150X_123:
+		reg   = pctl->data->pri.x123.reg_advanced;
+		value = 0x00;
+		break;
+	default:
+		WARN(1, "Unknown chip model %d\n", pctl->data->model);
+		return -EINVAL;
+	}
+
+	return regmap_write(pctl->regmap, reg, value);
+}
+
+static int sx150x_init_hw(struct sx150x_pinctrl *pctl)
+{
+	const u8 reg[] = {
+		[SX150X_789] = pctl->data->pri.x789.reg_polarity,
+		[SX150X_456] = pctl->data->pri.x456.reg_pld_mode,
+		[SX150X_123] = pctl->data->pri.x123.reg_pld_mode,
+	};
+	int err;
+
+	if (pctl->data->model == SX150X_789 &&
+	    of_property_read_bool(pctl->dev->of_node, "semtech,probe-reset")) {
+		err = sx150x_reset(pctl);
+		if (err < 0)
+			return err;
+	}
+
+	err = sx150x_init_misc(pctl);
+	if (err < 0)
+		return err;
+
+	/* Set all pins to work in normal mode */
+	return regmap_write(pctl->regmap, reg[pctl->data->model], 0);
+}
+
+static int sx150x_regmap_reg_width(struct sx150x_pinctrl *pctl,
+				   unsigned int reg)
+{
+	const struct sx150x_device_data *data = pctl->data;
+
+	if (reg == data->reg_sense) {
+		/*
+		 * RegSense packs two bits of configuration per GPIO,
+		 * so we'd need to read twice as many bits as there
+		 * are GPIO in our chip
+		 */
+		return 2 * data->ngpios;
+	} else if ((data->model == SX150X_789 &&
+		    (reg == data->pri.x789.reg_misc ||
+		     reg == data->pri.x789.reg_clock ||
+		     reg == data->pri.x789.reg_reset))
+		   ||
+		   (data->model == SX150X_123 &&
+		    reg == data->pri.x123.reg_advanced)
+		   ||
+		   (data->model == SX150X_456 &&
+		    data->pri.x456.reg_advanced &&
+		    reg == data->pri.x456.reg_advanced)) {
+		return 8;
+	} else {
+		return data->ngpios;
+	}
+}
+
+static unsigned int sx150x_maybe_swizzle(struct sx150x_pinctrl *pctl,
+					 unsigned int reg, unsigned int val)
+{
+	unsigned int a, b;
+	const struct sx150x_device_data *data = pctl->data;
+
+	/*
+	 * Whereas SX1509 presents RegSense in a simple layout as such:
+	 *	reg     [ f f e e d d c c ]
+	 *	reg + 1 [ b b a a 9 9 8 8 ]
+	 *	reg + 2 [ 7 7 6 6 5 5 4 4 ]
+	 *	reg + 3 [ 3 3 2 2 1 1 0 0 ]
+	 *
+	 * SX1503 and SX1506 deviate from that data layout, instead storing
+	 * their contents as follows:
+	 *
+	 *	reg     [ f f e e d d c c ]
+	 *	reg + 1 [ 7 7 6 6 5 5 4 4 ]
+	 *	reg + 2 [ b b a a 9 9 8 8 ]
+	 *	reg + 3 [ 3 3 2 2 1 1 0 0 ]
+	 *
+	 * so, taking that into account, we swap two
+	 * inner bytes of a 4-byte result
+	 */
+
+	if (reg == data->reg_sense &&
+	    data->ngpios == 16 &&
+	    (data->model == SX150X_123 ||
+	     data->model == SX150X_456)) {
+		a = val & 0x00ff0000;
+		b = val & 0x0000ff00;
+
+		val &= 0xff0000ff;
+		val |= b << 8;
+		val |= a >> 8;
+	}
+
+	return val;
+}
+
+/*
+ * In order to mask the differences between 16 and 8 bit expander
+ * devices we set up a sligthly ficticious regmap that pretends to be
+ * a set of 32-bit (to accommodate RegSenseLow/RegSenseHigh
+ * pair/quartet) registers and transparently reconstructs those
+ * registers via multiple I2C/SMBus reads
+ *
+ * This way the rest of the driver code, interfacing with the chip via
+ * regmap API, can work assuming that each GPIO pin is represented by
+ * a group of bits at an offset proportional to GPIO number within a
+ * given register.
+ */
+static int sx150x_regmap_reg_read(void *context, unsigned int reg,
+				  unsigned int *result)
+{
+	int ret, n;
+	struct sx150x_pinctrl *pctl = context;
+	struct i2c_client *i2c = pctl->client;
+	const int width = sx150x_regmap_reg_width(pctl, reg);
+	unsigned int idx, val;
+
+	/*
+	 * There are four potential cases covered by this function:
+	 *
+	 * 1) 8-pin chip, single configuration bit register
+	 *
+	 *	This is trivial the code below just needs to read:
+	 *		reg  [ 7 6 5 4 3 2 1 0 ]
+	 *
+	 * 2) 8-pin chip, double configuration bit register (RegSense)
+	 *
+	 *	The read will be done as follows:
+	 *		reg      [ 7 7 6 6 5 5 4 4 ]
+	 *		reg + 1  [ 3 3 2 2 1 1 0 0 ]
+	 *
+	 * 3) 16-pin chip, single configuration bit register
+	 *
+	 *	The read will be done as follows:
+	 *		reg     [ f e d c b a 9 8 ]
+	 *		reg + 1 [ 7 6 5 4 3 2 1 0 ]
+	 *
+	 * 4) 16-pin chip, double configuration bit register (RegSense)
+	 *
+	 *	The read will be done as follows:
+	 *		reg     [ f f e e d d c c ]
+	 *		reg + 1 [ b b a a 9 9 8 8 ]
+	 *		reg + 2 [ 7 7 6 6 5 5 4 4 ]
+	 *		reg + 3 [ 3 3 2 2 1 1 0 0 ]
+	 */
+
+	for (n = width, val = 0, idx = reg; n > 0; n -= 8, idx++) {
+		val <<= 8;
+
+		ret = i2c_smbus_read_byte_data(i2c, idx);
+		if (ret < 0)
+			return ret;
+
+		val |= ret;
+	}
+
+	*result = sx150x_maybe_swizzle(pctl, reg, val);
+
+	return 0;
+}
+
+static int sx150x_regmap_reg_write(void *context, unsigned int reg,
+				   unsigned int val)
+{
+	int ret, n;
+	struct sx150x_pinctrl *pctl = context;
+	struct i2c_client *i2c = pctl->client;
+	const int width = sx150x_regmap_reg_width(pctl, reg);
+
+	val = sx150x_maybe_swizzle(pctl, reg, val);
+
+	n = (width - 1) & ~7;
+	do {
+		const u8 byte = (val >> n) & 0xff;
+
+		ret = i2c_smbus_write_byte_data(i2c, reg, byte);
+		if (ret < 0)
+			return ret;
+
+		reg++;
+		n -= 8;
+	} while (n >= 0);
+
+	return 0;
+}
+
+static bool sx150x_reg_volatile(struct device *dev, unsigned int reg)
+{
+	struct sx150x_pinctrl *pctl = i2c_get_clientdata(to_i2c_client(dev));
+
+	return reg == pctl->data->reg_irq_src || reg == pctl->data->reg_data;
+}
+
+static const struct regmap_config sx150x_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 32,
+
+	.cache_type = REGCACHE_RBTREE,
+
+	.reg_read = sx150x_regmap_reg_read,
+	.reg_write = sx150x_regmap_reg_write,
+
+	.max_register = SX150X_MAX_REGISTER,
+	.volatile_reg = sx150x_reg_volatile,
+};
+
+static int sx150x_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	static const u32 i2c_funcs = I2C_FUNC_SMBUS_BYTE_DATA |
+				     I2C_FUNC_SMBUS_WRITE_WORD_DATA;
+	struct device *dev = &client->dev;
+	struct sx150x_pinctrl *pctl;
+	int ret;
+
+	if (!i2c_check_functionality(client->adapter, i2c_funcs))
+		return -ENOSYS;
+
+	pctl = devm_kzalloc(dev, sizeof(*pctl), GFP_KERNEL);
+	if (!pctl)
+		return -ENOMEM;
+
+	i2c_set_clientdata(client, pctl);
+
+	pctl->dev = dev;
+	pctl->client = client;
+
+	if (dev->of_node)
+		pctl->data = of_device_get_match_data(dev);
+	else
+		pctl->data = (struct sx150x_device_data *)id->driver_data;
+
+	if (!pctl->data)
+		return -EINVAL;
+
+	pctl->regmap = devm_regmap_init(dev, NULL, pctl,
+					&sx150x_regmap_config);
+	if (IS_ERR(pctl->regmap)) {
+		ret = PTR_ERR(pctl->regmap);
+		dev_err(dev, "Failed to allocate register map: %d\n",
+			ret);
+		return ret;
+	}
+
+	mutex_init(&pctl->lock);
+
+	ret = sx150x_init_hw(pctl);
+	if (ret)
+		return ret;
+
+	/* Pinctrl_desc */
+	pctl->pinctrl_desc.name = "sx150x-pinctrl";
+	pctl->pinctrl_desc.pctlops = &sx150x_pinctrl_ops;
+	pctl->pinctrl_desc.confops = &sx150x_pinconf_ops;
+	pctl->pinctrl_desc.pins = pctl->data->pins;
+	pctl->pinctrl_desc.npins = pctl->data->npins;
+	pctl->pinctrl_desc.owner = THIS_MODULE;
+
+	ret = devm_pinctrl_register_and_init(dev, &pctl->pinctrl_desc,
+					     pctl, &pctl->pctldev);
+	if (ret) {
+		dev_err(dev, "Failed to register pinctrl device\n");
+		return ret;
+	}
+
+	/* Register GPIO controller */
+	pctl->gpio.base = -1;
+	pctl->gpio.ngpio = pctl->data->npins;
+	pctl->gpio.get_direction = sx150x_gpio_get_direction;
+	pctl->gpio.direction_input = sx150x_gpio_direction_input;
+	pctl->gpio.direction_output = sx150x_gpio_direction_output;
+	pctl->gpio.get = sx150x_gpio_get;
+	pctl->gpio.set = sx150x_gpio_set;
+	pctl->gpio.set_config = gpiochip_generic_config;
+	pctl->gpio.parent = dev;
+#ifdef CONFIG_OF_GPIO
+	pctl->gpio.of_node = dev->of_node;
+#endif
+	pctl->gpio.can_sleep = true;
+	pctl->gpio.label = devm_kstrdup(dev, client->name, GFP_KERNEL);
+	if (!pctl->gpio.label)
+		return -ENOMEM;
+
+	/*
+	 * Setting multiple pins is not safe when all pins are not
+	 * handled by the same regmap register. The oscio pin (present
+	 * on the SX150X_789 chips) lives in its own register, so
+	 * would require locking that is not in place at this time.
+	 */
+	if (pctl->data->model != SX150X_789)
+		pctl->gpio.set_multiple = sx150x_gpio_set_multiple;
+
+	/* Add Interrupt support if an irq is specified */
+	if (client->irq > 0) {
+		struct gpio_irq_chip *girq;
+
+		pctl->irq_chip.irq_mask = sx150x_irq_mask;
+		pctl->irq_chip.irq_unmask = sx150x_irq_unmask;
+		pctl->irq_chip.irq_set_type = sx150x_irq_set_type;
+		pctl->irq_chip.irq_bus_lock = sx150x_irq_bus_lock;
+		pctl->irq_chip.irq_bus_sync_unlock = sx150x_irq_bus_sync_unlock;
+		pctl->irq_chip.name = devm_kstrdup(dev, client->name,
+						   GFP_KERNEL);
+		if (!pctl->irq_chip.name)
+			return -ENOMEM;
+
+		pctl->irq.masked = ~0;
+		pctl->irq.sense = 0;
+
+		/*
+		 * Because sx150x_irq_threaded_fn invokes all of the
+		 * nested interrupt handlers via handle_nested_irq,
+		 * any "handler" assigned to struct gpio_irq_chip
+		 * below is going to be ignored, so the choice of the
+		 * function does not matter that much.
+		 *
+		 * We set it to handle_bad_irq to avoid confusion,
+		 * plus it will be instantly noticeable if it is ever
+		 * called (should not happen)
+		 */
+		girq = &pctl->gpio.irq;
+		girq->chip = &pctl->irq_chip;
+		/* This will let us handle the parent IRQ in the driver */
+		girq->parent_handler = NULL;
+		girq->num_parents = 0;
+		girq->parents = NULL;
+		girq->default_type = IRQ_TYPE_NONE;
+		girq->handler = handle_bad_irq;
+		girq->threaded = true;
+
+		ret = devm_request_threaded_irq(dev, client->irq, NULL,
+						sx150x_irq_thread_fn,
+						IRQF_ONESHOT | IRQF_SHARED |
+						IRQF_TRIGGER_FALLING,
+						pctl->irq_chip.name, pctl);
+		if (ret < 0)
+			return ret;
+	}
+
+	ret = devm_gpiochip_add_data(dev, &pctl->gpio, pctl);
+	if (ret)
+		return ret;
+
+	/*
+	 * Pin control functions need to be enabled AFTER registering the
+	 * GPIO chip because sx150x_pinconf_set() calls
+	 * sx150x_gpio_direction_output().
+	 */
+	ret = pinctrl_enable(pctl->pctldev);
+	if (ret) {
+		dev_err(dev, "Failed to enable pinctrl device\n");
+		return ret;
+	}
+
+	ret = gpiochip_add_pin_range(&pctl->gpio, dev_name(dev),
+				     0, 0, pctl->data->npins);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static struct i2c_driver sx150x_driver = {
+	.driver = {
+		.name = "sx150x-pinctrl",
+		.of_match_table = of_match_ptr(sx150x_of_match),
+	},
+	.probe    = sx150x_probe,
+	.id_table = sx150x_id,
+};
+
+static int __init sx150x_init(void)
+{
+	return i2c_add_driver(&sx150x_driver);
+}
+subsys_initcall(sx150x_init);