pinctrl: Qualcomm SPMI PMIC MPP pin controller driver

This is the pinctrl, pinmux, pinconf and gpiolib driver for the
Qualcomm MPP sub-function blocks found in the PMIC chips.

Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com>
Acked-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

2 files changed, 950 insertions, 0 deletions

diff --git a/drivers/pinctrl/qcom/Makefile b/drivers/pinctrl/qcom/Makefile
index 9b49c65a1cab..bfd79af5f982 100644
--- a/drivers/pinctrl/qcom/Makefile
+++ b/drivers/pinctrl/qcom/Makefile
@@ -6,3 +6,4 @@ obj-$(CONFIG_PINCTRL_IPQ8064)	+= pinctrl-ipq8064.o
 obj-$(CONFIG_PINCTRL_MSM8960)	+= pinctrl-msm8960.o
 obj-$(CONFIG_PINCTRL_MSM8X74)	+= pinctrl-msm8x74.o
 obj-$(CONFIG_PINCTRL_QCOM_SPMI_PMIC) += pinctrl-spmi-gpio.o
+obj-$(CONFIG_PINCTRL_QCOM_SPMI_PMIC) += pinctrl-spmi-mpp.o
diff --git a/drivers/pinctrl/qcom/pinctrl-spmi-mpp.c b/drivers/pinctrl/qcom/pinctrl-spmi-mpp.c
new file mode 100644
index 000000000000..a8924dba335e
--- /dev/null
+++ b/drivers/pinctrl/qcom/pinctrl-spmi-mpp.c
@@ -0,0 +1,949 @@
+/*
+ * Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * 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/gpio.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#include <dt-bindings/pinctrl/qcom,pmic-mpp.h>
+
+#include "../core.h"
+#include "../pinctrl-utils.h"
+
+#define PMIC_MPP_ADDRESS_RANGE			0x100
+
+/*
+ * Pull Up Values - it indicates whether a pull-up should be
+ * applied for bidirectional mode only. The hardware ignores the
+ * configuration when operating in other modes.
+ */
+#define PMIC_MPP_PULL_UP_0P6KOHM		0
+#define PMIC_MPP_PULL_UP_10KOHM			1
+#define PMIC_MPP_PULL_UP_30KOHM			2
+#define PMIC_MPP_PULL_UP_OPEN			3
+
+/* type registers base address bases */
+#define PMIC_MPP_REG_TYPE			0x4
+#define PMIC_MPP_REG_SUBTYPE			0x5
+
+/* mpp peripheral type and subtype values */
+#define PMIC_MPP_TYPE				0x11
+#define PMIC_MPP_SUBTYPE_4CH_NO_ANA_OUT		0x3
+#define PMIC_MPP_SUBTYPE_ULT_4CH_NO_ANA_OUT	0x4
+#define PMIC_MPP_SUBTYPE_4CH_NO_SINK		0x5
+#define PMIC_MPP_SUBTYPE_ULT_4CH_NO_SINK	0x6
+#define PMIC_MPP_SUBTYPE_4CH_FULL_FUNC		0x7
+#define PMIC_MPP_SUBTYPE_8CH_FULL_FUNC		0xf
+
+#define PMIC_MPP_REG_RT_STS			0x10
+#define PMIC_MPP_REG_RT_STS_VAL_MASK		0x1
+
+/* control register base address bases */
+#define PMIC_MPP_REG_MODE_CTL			0x40
+#define PMIC_MPP_REG_DIG_VIN_CTL		0x41
+#define PMIC_MPP_REG_DIG_PULL_CTL		0x42
+#define PMIC_MPP_REG_DIG_IN_CTL			0x43
+#define PMIC_MPP_REG_EN_CTL			0x46
+#define PMIC_MPP_REG_AIN_CTL			0x4a
+
+/* PMIC_MPP_REG_MODE_CTL */
+#define PMIC_MPP_REG_MODE_VALUE_MASK		0x1
+#define PMIC_MPP_REG_MODE_FUNCTION_SHIFT	1
+#define PMIC_MPP_REG_MODE_FUNCTION_MASK		0x7
+#define PMIC_MPP_REG_MODE_DIR_SHIFT		4
+#define PMIC_MPP_REG_MODE_DIR_MASK		0x7
+
+/* PMIC_MPP_REG_DIG_VIN_CTL */
+#define PMIC_MPP_REG_VIN_SHIFT			0
+#define PMIC_MPP_REG_VIN_MASK			0x7
+
+/* PMIC_MPP_REG_DIG_PULL_CTL */
+#define PMIC_MPP_REG_PULL_SHIFT			0
+#define PMIC_MPP_REG_PULL_MASK			0x7
+
+/* PMIC_MPP_REG_EN_CTL */
+#define PMIC_MPP_REG_MASTER_EN_SHIFT		7
+
+/* PMIC_MPP_REG_AIN_CTL */
+#define PMIC_MPP_REG_AIN_ROUTE_SHIFT		0
+#define PMIC_MPP_REG_AIN_ROUTE_MASK		0x7
+
+#define PMIC_MPP_PHYSICAL_OFFSET		1
+
+/* Qualcomm specific pin configurations */
+#define PMIC_MPP_CONF_AMUX_ROUTE		(PIN_CONFIG_END + 1)
+#define PMIC_MPP_CONF_ANALOG_MODE		(PIN_CONFIG_END + 2)
+
+/**
+ * struct pmic_mpp_pad - keep current MPP settings
+ * @base: Address base in SPMI device.
+ * @irq: IRQ number which this MPP generate.
+ * @is_enabled: Set to false when MPP should be put in high Z state.
+ * @out_value: Cached pin output value.
+ * @output_enabled: Set to true if MPP output logic is enabled.
+ * @input_enabled: Set to true if MPP input buffer logic is enabled.
+ * @analog_mode: Set to true when MPP should operate in Analog Input, Analog
+ *	Output or Bidirectional Analog mode.
+ * @num_sources: Number of power-sources supported by this MPP.
+ * @power_source: Current power-source used.
+ * @amux_input: Set the source for analog input.
+ * @pullup: Pullup resistor value. Valid in Bidirectional mode only.
+ * @function: See pmic_mpp_functions[].
+ */
+struct pmic_mpp_pad {
+	u16		base;
+	int		irq;
+	bool		is_enabled;
+	bool		out_value;
+	bool		output_enabled;
+	bool		input_enabled;
+	bool		analog_mode;
+	unsigned int	num_sources;
+	unsigned int	power_source;
+	unsigned int	amux_input;
+	unsigned int	pullup;
+	unsigned int	function;
+};
+
+struct pmic_mpp_state {
+	struct device	*dev;
+	struct regmap	*map;
+	struct pinctrl_dev *ctrl;
+	struct gpio_chip chip;
+};
+
+struct pmic_mpp_bindings {
+	const char	*property;
+	unsigned	param;
+};
+
+static struct pmic_mpp_bindings pmic_mpp_bindings[] = {
+	{"qcom,amux-route",	PMIC_MPP_CONF_AMUX_ROUTE},
+	{"qcom,analog-mode",	PMIC_MPP_CONF_ANALOG_MODE},
+};
+
+static const char *const pmic_mpp_groups[] = {
+	"mpp1", "mpp2", "mpp3", "mpp4", "mpp5", "mpp6", "mpp7", "mpp8",
+};
+
+static const char *const pmic_mpp_functions[] = {
+	PMIC_MPP_FUNC_NORMAL, PMIC_MPP_FUNC_PAIRED,
+	"reserved1", "reserved2",
+	PMIC_MPP_FUNC_DTEST1, PMIC_MPP_FUNC_DTEST2,
+	PMIC_MPP_FUNC_DTEST3, PMIC_MPP_FUNC_DTEST4,
+};
+
+static inline struct pmic_mpp_state *to_mpp_state(struct gpio_chip *chip)
+{
+	return container_of(chip, struct pmic_mpp_state, chip);
+};
+
+static int pmic_mpp_read(struct pmic_mpp_state *state,
+			 struct pmic_mpp_pad *pad, unsigned int addr)
+{
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(state->map, pad->base + addr, &val);
+	if (ret < 0)
+		dev_err(state->dev, "read 0x%x failed\n", addr);
+	else
+		ret = val;
+
+	return ret;
+}
+
+static int pmic_mpp_write(struct pmic_mpp_state *state,
+			  struct pmic_mpp_pad *pad, unsigned int addr,
+			  unsigned int val)
+{
+	int ret;
+
+	ret = regmap_write(state->map, pad->base + addr, val);
+	if (ret < 0)
+		dev_err(state->dev, "write 0x%x failed\n", addr);
+
+	return ret;
+}
+
+static int pmic_mpp_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	/* Every PIN is a group */
+	return pctldev->desc->npins;
+}
+
+static const char *pmic_mpp_get_group_name(struct pinctrl_dev *pctldev,
+					   unsigned pin)
+{
+	return pctldev->desc->pins[pin].name;
+}
+
+static int pmic_mpp_get_group_pins(struct pinctrl_dev *pctldev,
+				   unsigned pin,
+				   const unsigned **pins, unsigned *num_pins)
+{
+	*pins = &pctldev->desc->pins[pin].number;
+	*num_pins = 1;
+	return 0;
+}
+
+static int pmic_mpp_parse_dt_config(struct device_node *np,
+				    struct pinctrl_dev *pctldev,
+				    unsigned long **configs,
+				    unsigned int *nconfs)
+{
+	struct pmic_mpp_bindings *par;
+	unsigned long cfg;
+	int ret, i;
+	u32 val;
+
+	for (i = 0; i < ARRAY_SIZE(pmic_mpp_bindings); i++) {
+		par = &pmic_mpp_bindings[i];
+		ret = of_property_read_u32(np, par->property, &val);
+
+		/* property not found */
+		if (ret == -EINVAL)
+			continue;
+
+		/* use zero as default value, when no value is specified */
+		if (ret)
+			val = 0;
+
+		dev_dbg(pctldev->dev, "found %s with value %u\n",
+			par->property, val);
+
+		cfg = pinconf_to_config_packed(par->param, val);
+
+		ret = pinctrl_utils_add_config(pctldev, configs, nconfs, cfg);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int pmic_mpp_dt_subnode_to_map(struct pinctrl_dev *pctldev,
+				      struct device_node *np,
+				      struct pinctrl_map **map,
+				      unsigned *reserv, unsigned *nmaps,
+				      enum pinctrl_map_type type)
+{
+	unsigned long *configs = NULL;
+	unsigned nconfs = 0;
+	struct property *prop;
+	const char *group;
+	int ret;
+
+	ret = pmic_mpp_parse_dt_config(np, pctldev, &configs, &nconfs);
+	if (ret < 0)
+		return ret;
+
+	if (!nconfs)
+		return 0;
+
+	ret = of_property_count_strings(np, "pins");
+	if (ret < 0)
+		goto exit;
+
+	ret = pinctrl_utils_reserve_map(pctldev, map, reserv, nmaps, ret);
+	if (ret < 0)
+		goto exit;
+
+	of_property_for_each_string(np, "pins", prop, group) {
+		ret = pinctrl_utils_add_map_configs(pctldev, map,
+						    reserv, nmaps, group,
+						    configs, nconfs, type);
+		if (ret < 0)
+			break;
+	}
+exit:
+	kfree(configs);
+	return ret;
+}
+
+static int pmic_mpp_dt_node_to_map(struct pinctrl_dev *pctldev,
+				   struct device_node *np_config,
+				   struct pinctrl_map **map, unsigned *nmaps)
+{
+	struct device_node *np;
+	enum pinctrl_map_type type;
+	unsigned reserv;
+	int ret;
+
+	ret = 0;
+	*map = NULL;
+	*nmaps = 0;
+	reserv = 0;
+	type = PIN_MAP_TYPE_CONFIGS_GROUP;
+
+	for_each_child_of_node(np_config, np) {
+		ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map,
+							&reserv, nmaps, type);
+		if (ret)
+			break;
+
+		ret = pmic_mpp_dt_subnode_to_map(pctldev, np, map, &reserv,
+						 nmaps, type);
+		if (ret)
+			break;
+	}
+
+	if (ret < 0)
+		pinctrl_utils_dt_free_map(pctldev, *map, *nmaps);
+
+	return ret;
+}
+
+static const struct pinctrl_ops pmic_mpp_pinctrl_ops = {
+	.get_groups_count	= pmic_mpp_get_groups_count,
+	.get_group_name		= pmic_mpp_get_group_name,
+	.get_group_pins		= pmic_mpp_get_group_pins,
+	.dt_node_to_map		= pmic_mpp_dt_node_to_map,
+	.dt_free_map		= pinctrl_utils_dt_free_map,
+};
+
+static int pmic_mpp_get_functions_count(struct pinctrl_dev *pctldev)
+{
+	return ARRAY_SIZE(pmic_mpp_functions);
+}
+
+static const char *pmic_mpp_get_function_name(struct pinctrl_dev *pctldev,
+					      unsigned function)
+{
+	return pmic_mpp_functions[function];
+}
+
+static int pmic_mpp_get_function_groups(struct pinctrl_dev *pctldev,
+					unsigned function,
+					const char *const **groups,
+					unsigned *const num_qgroups)
+{
+	*groups = pmic_mpp_groups;
+	*num_qgroups = pctldev->desc->npins;
+	return 0;
+}
+
+static int pmic_mpp_set_mux(struct pinctrl_dev *pctldev, unsigned function,
+				unsigned pin)
+{
+	struct pmic_mpp_state *state = pinctrl_dev_get_drvdata(pctldev);
+	struct pmic_mpp_pad *pad;
+	unsigned int val;
+	int ret;
+
+	pad = pctldev->desc->pins[pin].drv_data;
+
+	pad->function = function;
+
+	if (!pad->analog_mode) {
+		val = 0;	/* just digital input */
+		if (pad->output_enabled) {
+			if (pad->input_enabled)
+				val = 2; /* digital input and output */
+			else
+				val = 1; /* just digital output */
+		}
+	} else {
+		val = 4;	/* just analog input */
+		if (pad->output_enabled) {
+			if (pad->input_enabled)
+				val = 3; /* analog input and output */
+			else
+				val = 5; /* just analog output */
+		}
+	}
+
+	val |= pad->function << PMIC_MPP_REG_MODE_FUNCTION_SHIFT;
+	val |= pad->out_value & PMIC_MPP_REG_MODE_VALUE_MASK;
+
+	ret = pmic_mpp_write(state, pad, PMIC_MPP_REG_MODE_CTL, val);
+	if (ret < 0)
+		return ret;
+
+	val = pad->is_enabled << PMIC_MPP_REG_MASTER_EN_SHIFT;
+
+	return pmic_mpp_write(state, pad, PMIC_MPP_REG_EN_CTL, val);
+}
+
+static const struct pinmux_ops pmic_mpp_pinmux_ops = {
+	.get_functions_count	= pmic_mpp_get_functions_count,
+	.get_function_name	= pmic_mpp_get_function_name,
+	.get_function_groups	= pmic_mpp_get_function_groups,
+	.set_mux		= pmic_mpp_set_mux,
+};
+
+static int pmic_mpp_config_get(struct pinctrl_dev *pctldev,
+			       unsigned int pin, unsigned long *config)
+{
+	unsigned param = pinconf_to_config_param(*config);
+	struct pmic_mpp_pad *pad;
+	unsigned arg = 0;
+
+	pad = pctldev->desc->pins[pin].drv_data;
+
+	switch (param) {
+	case PIN_CONFIG_BIAS_DISABLE:
+		arg = pad->pullup == PMIC_MPP_PULL_UP_OPEN;
+		break;
+	case PIN_CONFIG_BIAS_PULL_UP:
+		switch (pad->pullup) {
+		case PMIC_MPP_PULL_UP_OPEN:
+			arg = 0;
+			break;
+		case PMIC_MPP_PULL_UP_0P6KOHM:
+			arg = 600;
+			break;
+		case PMIC_MPP_PULL_UP_10KOHM:
+			arg = 10000;
+			break;
+		case PMIC_MPP_PULL_UP_30KOHM:
+			arg = 30000;
+			break;
+		default:
+			return -EINVAL;
+		}
+		break;
+	case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
+		arg = !pad->is_enabled;
+		break;
+	case PIN_CONFIG_POWER_SOURCE:
+		arg = pad->power_source;
+		break;
+	case PIN_CONFIG_INPUT_ENABLE:
+		arg = pad->input_enabled;
+		break;
+	case PIN_CONFIG_OUTPUT:
+		arg = pad->out_value;
+		break;
+	case PMIC_MPP_CONF_AMUX_ROUTE:
+		arg = pad->amux_input;
+		break;
+	case PMIC_MPP_CONF_ANALOG_MODE:
+		arg = pad->analog_mode;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* Convert register value to pinconf value */
+	*config = pinconf_to_config_packed(param, arg);
+	return 0;
+}
+
+static int pmic_mpp_config_set(struct pinctrl_dev *pctldev, unsigned int pin,
+			       unsigned long *configs, unsigned nconfs)
+{
+	struct pmic_mpp_state *state = pinctrl_dev_get_drvdata(pctldev);
+	struct pmic_mpp_pad *pad;
+	unsigned param, arg;
+	unsigned int val;
+	int i, ret;
+
+	pad = pctldev->desc->pins[pin].drv_data;
+
+	for (i = 0; i < nconfs; i++) {
+		param = pinconf_to_config_param(configs[i]);
+		arg = pinconf_to_config_argument(configs[i]);
+
+		switch (param) {
+		case PIN_CONFIG_BIAS_DISABLE:
+			pad->pullup = PMIC_MPP_PULL_UP_OPEN;
+			break;
+		case PIN_CONFIG_BIAS_PULL_UP:
+			switch (arg) {
+			case 600:
+				pad->pullup = PMIC_MPP_PULL_UP_0P6KOHM;
+				break;
+			case 10000:
+				pad->pullup = PMIC_MPP_PULL_UP_10KOHM;
+				break;
+			case 30000:
+				pad->pullup = PMIC_MPP_PULL_UP_30KOHM;
+				break;
+			default:
+				return -EINVAL;
+			}
+			break;
+		case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
+			pad->is_enabled = false;
+			break;
+		case PIN_CONFIG_POWER_SOURCE:
+			if (arg >= pad->num_sources)
+				return -EINVAL;
+			pad->power_source = arg;
+			break;
+		case PIN_CONFIG_INPUT_ENABLE:
+			pad->input_enabled = arg ? true : false;
+			break;
+		case PIN_CONFIG_OUTPUT:
+			pad->output_enabled = true;
+			pad->out_value = arg;
+			break;
+		case PMIC_MPP_CONF_AMUX_ROUTE:
+			if (arg >= PMIC_MPP_AMUX_ROUTE_ABUS4)
+				return -EINVAL;
+			pad->amux_input = arg;
+			break;
+		case PMIC_MPP_CONF_ANALOG_MODE:
+			pad->analog_mode = true;
+			break;
+		default:
+			return -EINVAL;
+		}
+	}
+
+	val = pad->power_source << PMIC_MPP_REG_VIN_SHIFT;
+
+	ret = pmic_mpp_write(state, pad, PMIC_MPP_REG_DIG_VIN_CTL, val);
+	if (ret < 0)
+		return ret;
+
+	val = pad->pullup << PMIC_MPP_REG_PULL_SHIFT;
+
+	ret = pmic_mpp_write(state, pad, PMIC_MPP_REG_DIG_PULL_CTL, val);
+	if (ret < 0)
+		return ret;
+
+	val = pad->amux_input & PMIC_MPP_REG_AIN_ROUTE_MASK;
+
+	ret = pmic_mpp_write(state, pad, PMIC_MPP_REG_AIN_CTL, val);
+	if (ret < 0)
+		return ret;
+
+	if (!pad->analog_mode) {
+		val = 0;	/* just digital input */
+		if (pad->output_enabled) {
+			if (pad->input_enabled)
+				val = 2; /* digital input and output */
+			else
+				val = 1; /* just digital output */
+		}
+	} else {
+		val = 4;	/* just analog input */
+		if (pad->output_enabled) {
+			if (pad->input_enabled)
+				val = 3; /* analog input and output */
+			else
+				val = 5; /* just analog output */
+		}
+	}
+
+	val = val << PMIC_MPP_REG_MODE_DIR_SHIFT;
+	val |= pad->function << PMIC_MPP_REG_MODE_FUNCTION_SHIFT;
+	val |= pad->out_value & PMIC_MPP_REG_MODE_VALUE_MASK;
+
+	return pmic_mpp_write(state, pad, PMIC_MPP_REG_MODE_CTL, val);
+}
+
+static void pmic_mpp_config_dbg_show(struct pinctrl_dev *pctldev,
+				     struct seq_file *s, unsigned pin)
+{
+	struct pmic_mpp_state *state = pinctrl_dev_get_drvdata(pctldev);
+	struct pmic_mpp_pad *pad;
+	int ret, val;
+
+	static const char *const biases[] = {
+		"0.6kOhm", "10kOhm", "30kOhm", "Disabled"
+	};
+
+
+	pad = pctldev->desc->pins[pin].drv_data;
+
+	seq_printf(s, " mpp%-2d:", pin + PMIC_MPP_PHYSICAL_OFFSET);
+
+	val = pmic_mpp_read(state, pad, PMIC_MPP_REG_EN_CTL);
+
+	if (val < 0 || !(val >> PMIC_MPP_REG_MASTER_EN_SHIFT)) {
+		seq_puts(s, " ---");
+	} else {
+
+		if (pad->input_enabled) {
+			ret = pmic_mpp_read(state, pad, PMIC_MPP_REG_RT_STS);
+			if (!ret) {
+				ret &= PMIC_MPP_REG_RT_STS_VAL_MASK;
+				pad->out_value = ret;
+			}
+		}
+
+		seq_printf(s, " %-4s", pad->output_enabled ? "out" : "in");
+		seq_printf(s, " %-4s", pad->analog_mode ? "ana" : "dig");
+		seq_printf(s, " %-7s", pmic_mpp_functions[pad->function]);
+		seq_printf(s, " vin-%d", pad->power_source);
+		seq_printf(s, " %-8s", biases[pad->pullup]);
+		seq_printf(s, " %-4s", pad->out_value ? "high" : "low");
+	}
+}
+
+static const struct pinconf_ops pmic_mpp_pinconf_ops = {
+	.pin_config_group_get		= pmic_mpp_config_get,
+	.pin_config_group_set		= pmic_mpp_config_set,
+	.pin_config_group_dbg_show	= pmic_mpp_config_dbg_show,
+};
+
+static int pmic_mpp_direction_input(struct gpio_chip *chip, unsigned pin)
+{
+	struct pmic_mpp_state *state = to_mpp_state(chip);
+	unsigned long config;
+
+	config = pinconf_to_config_packed(PIN_CONFIG_INPUT_ENABLE, 1);
+
+	return pmic_mpp_config_set(state->ctrl, pin, &config, 1);
+}
+
+static int pmic_mpp_direction_output(struct gpio_chip *chip,
+				     unsigned pin, int val)
+{
+	struct pmic_mpp_state *state = to_mpp_state(chip);
+	unsigned long config;
+
+	config = pinconf_to_config_packed(PIN_CONFIG_OUTPUT, val);
+
+	return pmic_mpp_config_set(state->ctrl, pin, &config, 1);
+}
+
+static int pmic_mpp_get(struct gpio_chip *chip, unsigned pin)
+{
+	struct pmic_mpp_state *state = to_mpp_state(chip);
+	struct pmic_mpp_pad *pad;
+	int ret;
+
+	pad = state->ctrl->desc->pins[pin].drv_data;
+
+	if (pad->input_enabled) {
+		ret = pmic_mpp_read(state, pad, PMIC_MPP_REG_RT_STS);
+		if (ret < 0)
+			return ret;
+
+		pad->out_value = ret & PMIC_MPP_REG_RT_STS_VAL_MASK;
+	}
+
+	return pad->out_value;
+}
+
+static void pmic_mpp_set(struct gpio_chip *chip, unsigned pin, int value)
+{
+	struct pmic_mpp_state *state = to_mpp_state(chip);
+	unsigned long config;
+
+	config = pinconf_to_config_packed(PIN_CONFIG_OUTPUT, value);
+
+	pmic_mpp_config_set(state->ctrl, pin, &config, 1);
+}
+
+static int pmic_mpp_request(struct gpio_chip *chip, unsigned base)
+{
+	return pinctrl_request_gpio(chip->base + base);
+}
+
+static void pmic_mpp_free(struct gpio_chip *chip, unsigned base)
+{
+	pinctrl_free_gpio(chip->base + base);
+}
+
+static int pmic_mpp_of_xlate(struct gpio_chip *chip,
+			     const struct of_phandle_args *gpio_desc,
+			     u32 *flags)
+{
+	if (chip->of_gpio_n_cells < 2)
+		return -EINVAL;
+
+	if (flags)
+		*flags = gpio_desc->args[1];
+
+	return gpio_desc->args[0] - PMIC_MPP_PHYSICAL_OFFSET;
+}
+
+static int pmic_mpp_to_irq(struct gpio_chip *chip, unsigned pin)
+{
+	struct pmic_mpp_state *state = to_mpp_state(chip);
+	struct pmic_mpp_pad *pad;
+
+	pad = state->ctrl->desc->pins[pin].drv_data;
+
+	return pad->irq;
+}
+
+static void pmic_mpp_dbg_show(struct seq_file *s, struct gpio_chip *chip)
+{
+	struct pmic_mpp_state *state = to_mpp_state(chip);
+	unsigned i;
+
+	for (i = 0; i < chip->ngpio; i++) {
+		pmic_mpp_config_dbg_show(state->ctrl, s, i);
+		seq_puts(s, "\n");
+	}
+}
+
+static const struct gpio_chip pmic_mpp_gpio_template = {
+	.direction_input	= pmic_mpp_direction_input,
+	.direction_output	= pmic_mpp_direction_output,
+	.get			= pmic_mpp_get,
+	.set			= pmic_mpp_set,
+	.request		= pmic_mpp_request,
+	.free			= pmic_mpp_free,
+	.of_xlate		= pmic_mpp_of_xlate,
+	.to_irq			= pmic_mpp_to_irq,
+	.dbg_show		= pmic_mpp_dbg_show,
+};
+
+static int pmic_mpp_populate(struct pmic_mpp_state *state,
+			     struct pmic_mpp_pad *pad)
+{
+	int type, subtype, val, dir;
+
+	type = pmic_mpp_read(state, pad, PMIC_MPP_REG_TYPE);
+	if (type < 0)
+		return type;
+
+	if (type != PMIC_MPP_TYPE) {
+		dev_err(state->dev, "incorrect block type 0x%x at 0x%x\n",
+			type, pad->base);
+		return -ENODEV;
+	}
+
+	subtype = pmic_mpp_read(state, pad, PMIC_MPP_REG_SUBTYPE);
+	if (subtype < 0)
+		return subtype;
+
+	switch (subtype) {
+	case PMIC_MPP_SUBTYPE_4CH_NO_ANA_OUT:
+	case PMIC_MPP_SUBTYPE_ULT_4CH_NO_ANA_OUT:
+	case PMIC_MPP_SUBTYPE_4CH_NO_SINK:
+	case PMIC_MPP_SUBTYPE_ULT_4CH_NO_SINK:
+	case PMIC_MPP_SUBTYPE_4CH_FULL_FUNC:
+		pad->num_sources = 4;
+		break;
+	case PMIC_MPP_SUBTYPE_8CH_FULL_FUNC:
+		pad->num_sources = 8;
+		break;
+	default:
+		dev_err(state->dev, "unknown MPP type 0x%x at 0x%x\n",
+			subtype, pad->base);
+		return -ENODEV;
+	}
+
+	val = pmic_mpp_read(state, pad, PMIC_MPP_REG_MODE_CTL);
+	if (val < 0)
+		return val;
+
+	pad->out_value = val & PMIC_MPP_REG_MODE_VALUE_MASK;
+
+	dir = val >> PMIC_MPP_REG_MODE_DIR_SHIFT;
+	dir &= PMIC_MPP_REG_MODE_DIR_MASK;
+
+	switch (dir) {
+	case 0:
+		pad->input_enabled = true;
+		pad->output_enabled = false;
+		pad->analog_mode = false;
+		break;
+	case 1:
+		pad->input_enabled = false;
+		pad->output_enabled = true;
+		pad->analog_mode = false;
+		break;
+	case 2:
+		pad->input_enabled = true;
+		pad->output_enabled = true;
+		pad->analog_mode = false;
+		break;
+	case 3:
+		pad->input_enabled = true;
+		pad->output_enabled = true;
+		pad->analog_mode = true;
+		break;
+	case 4:
+		pad->input_enabled = true;
+		pad->output_enabled = false;
+		pad->analog_mode = true;
+		break;
+	case 5:
+		pad->input_enabled = false;
+		pad->output_enabled = true;
+		pad->analog_mode = true;
+		break;
+	default:
+		dev_err(state->dev, "unknown MPP direction\n");
+		return -ENODEV;
+	}
+
+	pad->function = val >> PMIC_MPP_REG_MODE_FUNCTION_SHIFT;
+	pad->function &= PMIC_MPP_REG_MODE_FUNCTION_MASK;
+
+	val = pmic_mpp_read(state, pad, PMIC_MPP_REG_DIG_VIN_CTL);
+	if (val < 0)
+		return val;
+
+	pad->power_source = val >> PMIC_MPP_REG_VIN_SHIFT;
+	pad->power_source &= PMIC_MPP_REG_VIN_MASK;
+
+	val = pmic_mpp_read(state, pad, PMIC_MPP_REG_DIG_PULL_CTL);
+	if (val < 0)
+		return val;
+
+	pad->pullup = val >> PMIC_MPP_REG_PULL_SHIFT;
+	pad->pullup &= PMIC_MPP_REG_PULL_MASK;
+
+	val = pmic_mpp_read(state, pad, PMIC_MPP_REG_AIN_CTL);
+	if (val < 0)
+		return val;
+
+	pad->amux_input = val >> PMIC_MPP_REG_AIN_ROUTE_SHIFT;
+	pad->amux_input &= PMIC_MPP_REG_AIN_ROUTE_MASK;
+
+	/* Pin could be disabled with PIN_CONFIG_BIAS_HIGH_IMPEDANCE */
+	pad->is_enabled = true;
+	return 0;
+}
+
+static int pmic_mpp_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct pinctrl_pin_desc *pindesc;
+	struct pinctrl_desc *pctrldesc;
+	struct pmic_mpp_pad *pad, *pads;
+	struct pmic_mpp_state *state;
+	int ret, npins, i;
+	u32 res[2];
+
+	ret = of_property_read_u32_array(dev->of_node, "reg", res, 2);
+	if (ret < 0) {
+		dev_err(dev, "missing base address and/or range");
+		return ret;
+	}
+
+	npins = res[1] / PMIC_MPP_ADDRESS_RANGE;
+	if (!npins)
+		return -EINVAL;
+
+	BUG_ON(npins > ARRAY_SIZE(pmic_mpp_groups));
+
+	state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
+	if (!state)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, state);
+
+	state->dev = &pdev->dev;
+	state->map = dev_get_regmap(dev->parent, NULL);
+
+	pindesc = devm_kcalloc(dev, npins, sizeof(*pindesc), GFP_KERNEL);
+	if (!pindesc)
+		return -ENOMEM;
+
+	pads = devm_kcalloc(dev, npins, sizeof(*pads), GFP_KERNEL);
+	if (!pads)
+		return -ENOMEM;
+
+	pctrldesc = devm_kzalloc(dev, sizeof(*pctrldesc), GFP_KERNEL);
+	if (!pctrldesc)
+		return -ENOMEM;
+
+	pctrldesc->pctlops = &pmic_mpp_pinctrl_ops;
+	pctrldesc->pmxops = &pmic_mpp_pinmux_ops;
+	pctrldesc->confops = &pmic_mpp_pinconf_ops;
+	pctrldesc->owner = THIS_MODULE;
+	pctrldesc->name = dev_name(dev);
+	pctrldesc->pins = pindesc;
+	pctrldesc->npins = npins;
+
+	for (i = 0; i < npins; i++, pindesc++) {
+		pad = &pads[i];
+		pindesc->drv_data = pad;
+		pindesc->number = i;
+		pindesc->name = pmic_mpp_groups[i];
+
+		pad->irq = platform_get_irq(pdev, i);
+		if (pad->irq < 0)
+			return pad->irq;
+
+		pad->base = res[0] + i * PMIC_MPP_ADDRESS_RANGE;
+
+		ret = pmic_mpp_populate(state, pad);
+		if (ret < 0)
+			return ret;
+	}
+
+	state->chip = pmic_mpp_gpio_template;
+	state->chip.dev = dev;
+	state->chip.base = -1;
+	state->chip.ngpio = npins;
+	state->chip.label = dev_name(dev);
+	state->chip.of_gpio_n_cells = 2;
+	state->chip.can_sleep = false;
+
+	state->ctrl = pinctrl_register(pctrldesc, dev, state);
+	if (!state->ctrl)
+		return -ENODEV;
+
+	ret = gpiochip_add(&state->chip);
+	if (ret) {
+		dev_err(state->dev, "can't add gpio chip\n");
+		goto err_chip;
+	}
+
+	ret = gpiochip_add_pin_range(&state->chip, dev_name(dev), 0, 0, npins);
+	if (ret) {
+		dev_err(dev, "failed to add pin range\n");
+		goto err_range;
+	}
+
+	return 0;
+
+err_range:
+	gpiochip_remove(&state->chip);
+err_chip:
+	pinctrl_unregister(state->ctrl);
+	return ret;
+}
+
+static int pmic_mpp_remove(struct platform_device *pdev)
+{
+	struct pmic_mpp_state *state = platform_get_drvdata(pdev);
+
+	gpiochip_remove(&state->chip);
+	pinctrl_unregister(state->ctrl);
+	return 0;
+}
+
+static const struct of_device_id pmic_mpp_of_match[] = {
+	{ .compatible = "qcom,pm8841-mpp" },	/* 4 MPP's */
+	{ .compatible = "qcom,pm8941-mpp" },	/* 8 MPP's */
+	{ .compatible = "qcom,pma8084-mpp" },	/* 8 MPP's */
+	{ },
+};
+
+MODULE_DEVICE_TABLE(of, pmic_mpp_of_match);
+
+static struct platform_driver pmic_mpp_driver = {
+	.driver = {
+		   .name = "qcom-spmi-mpp",
+		   .of_match_table = pmic_mpp_of_match,
+	},
+	.probe	= pmic_mpp_probe,
+	.remove = pmic_mpp_remove,
+};
+
+module_platform_driver(pmic_mpp_driver);
+
+MODULE_AUTHOR("Ivan T. Ivanov <iivanov@mm-sol.com>");
+MODULE_DESCRIPTION("Qualcomm SPMI PMIC MPP pin control driver");
+MODULE_ALIAS("platform:qcom-spmi-mpp");
+MODULE_LICENSE("GPL v2");