path: root/drivers/gpio/qcom_spmi_gpio.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Qualcomm generic pmic gpio driver
 *
 * Based on the original qcom_spmi_pmic_gpio driver from:
 * Copyright (c) 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
 *
 * Updated from the Linux pinctrl-spmi-gpio driver from:
 * Copyright (c) 2012-2014, 2016-2021 The Linux Foundation. All rights reserved.
 * Copyright (c) 2021-2022 Qualcomm Innovation Center, Inc. All rights reserved.
 */

#include <dm.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <dm/pinctrl.h>
#include <dm/device_compat.h>
#include <log.h>
#include <power/pmic.h>
#include <spmi/spmi.h>
#include <asm/io.h>
#include <stdlib.h>
#include <asm/gpio.h>
#include <linux/bitops.h>
#include <dt-bindings/pinctrl/qcom,pmic-gpio.h>

#define PMIC_MAX_GPIOS				36

#define PMIC_GPIO_ADDRESS_RANGE			0x100

/* type and subtype registers base address offsets */
#define PMIC_GPIO_REG_TYPE			0x4
#define PMIC_GPIO_REG_SUBTYPE			0x5

/* GPIO peripheral type and subtype out_values */
#define PMIC_GPIO_TYPE				0x10
#define PMIC_GPIO_SUBTYPE_GPIO_4CH		0x1
#define PMIC_GPIO_SUBTYPE_GPIOC_4CH		0x5
#define PMIC_GPIO_SUBTYPE_GPIO_8CH		0x9
#define PMIC_GPIO_SUBTYPE_GPIOC_8CH		0xd
#define PMIC_GPIO_SUBTYPE_GPIO_LV		0x10
#define PMIC_GPIO_SUBTYPE_GPIO_MV		0x11
#define PMIC_GPIO_SUBTYPE_GPIO_LV_VIN2		0x12
#define PMIC_GPIO_SUBTYPE_GPIO_MV_VIN3		0x13

#define PMIC_MPP_REG_RT_STS			0x10
#define PMIC_MPP_REG_RT_STS_VAL_MASK		0x1

/* control register base address offsets */
#define PMIC_GPIO_REG_MODE_CTL			0x40
#define PMIC_GPIO_REG_DIG_VIN_CTL		0x41
#define PMIC_GPIO_REG_DIG_PULL_CTL		0x42
#define PMIC_GPIO_REG_LV_MV_DIG_OUT_SOURCE_CTL	0x44
	#define PMIC_GPIO_REG_DIG_IN_CTL		0x43
#define PMIC_GPIO_REG_DIG_OUT_CTL		0x45
#define PMIC_GPIO_REG_EN_CTL			0x46
	#define PMIC_GPIO_REG_LV_MV_ANA_PASS_THRU_SEL	0x4A

/* PMIC_GPIO_REG_MODE_CTL */
#define PMIC_GPIO_REG_MODE_VALUE_SHIFT		0x1
#define PMIC_GPIO_REG_MODE_FUNCTION_SHIFT	1
#define PMIC_GPIO_REG_MODE_FUNCTION_MASK	0x7
#define PMIC_GPIO_REG_MODE_DIR_SHIFT		4
#define PMIC_GPIO_REG_MODE_DIR_MASK		0x7

#define PMIC_GPIO_MODE_DIGITAL_INPUT		0
#define PMIC_GPIO_MODE_DIGITAL_OUTPUT		1
#define PMIC_GPIO_MODE_DIGITAL_INPUT_OUTPUT	2
#define PMIC_GPIO_MODE_ANALOG_PASS_THRU		3
#define PMIC_GPIO_REG_LV_MV_MODE_DIR_MASK	0x3

/* PMIC_GPIO_REG_DIG_VIN_CTL */
#define PMIC_GPIO_REG_VIN_SHIFT			0
#define PMIC_GPIO_REG_VIN_MASK			0x7

/* PMIC_GPIO_REG_DIG_PULL_CTL */
#define PMIC_GPIO_REG_PULL_SHIFT		0
#define PMIC_GPIO_REG_PULL_MASK			0x7

#define PMIC_GPIO_PULL_DOWN			4
#define PMIC_GPIO_PULL_DISABLE			5

/* PMIC_GPIO_REG_LV_MV_DIG_OUT_SOURCE_CTL for LV/MV */
#define PMIC_GPIO_LV_MV_OUTPUT_INVERT		0x80
#define PMIC_GPIO_LV_MV_OUTPUT_INVERT_SHIFT	7
#define PMIC_GPIO_LV_MV_OUTPUT_SOURCE_SEL_MASK	0xF

/* PMIC_GPIO_REG_DIG_IN_CTL */
#define PMIC_GPIO_LV_MV_DIG_IN_DTEST_EN		0x80
#define PMIC_GPIO_LV_MV_DIG_IN_DTEST_SEL_MASK	0x7
#define PMIC_GPIO_DIG_IN_DTEST_SEL_MASK		0xf

/* PMIC_GPIO_REG_DIG_OUT_CTL */
#define PMIC_GPIO_REG_OUT_STRENGTH_SHIFT	0
#define PMIC_GPIO_REG_OUT_STRENGTH_MASK		0x3
#define PMIC_GPIO_REG_OUT_TYPE_SHIFT		4
#define PMIC_GPIO_REG_OUT_TYPE_MASK		0x3

/*
 * Output type - indicates pin should be configured as push-pull,
 * open drain or open source.
 */
#define PMIC_GPIO_OUT_BUF_CMOS			0
#define PMIC_GPIO_OUT_BUF_OPEN_DRAIN_NMOS	1
#define PMIC_GPIO_OUT_BUF_OPEN_DRAIN_PMOS	2

#define PMIC_GPIO_OUT_STRENGTH_LOW		1
#define PMIC_GPIO_OUT_STRENGTH_HIGH		3

/* PMIC_GPIO_REG_EN_CTL */
#define PMIC_GPIO_REG_MASTER_EN_SHIFT		7

#define PMIC_GPIO_PHYSICAL_OFFSET		1

/* PMIC_GPIO_REG_LV_MV_ANA_PASS_THRU_SEL */
#define PMIC_GPIO_LV_MV_ANA_MUX_SEL_MASK		0x3

/* The index of each function in spmi_pmic_gpio_functions[] array */
enum spmi_pmic_gpio_func_index {
	PMIC_GPIO_FUNC_INDEX_NORMAL,
	PMIC_GPIO_FUNC_INDEX_PAIRED,
	PMIC_GPIO_FUNC_INDEX_FUNC1,
	PMIC_GPIO_FUNC_INDEX_FUNC2,
	PMIC_GPIO_FUNC_INDEX_FUNC3,
	PMIC_GPIO_FUNC_INDEX_FUNC4,
	PMIC_GPIO_FUNC_INDEX_DTEST1,
	PMIC_GPIO_FUNC_INDEX_DTEST2,
	PMIC_GPIO_FUNC_INDEX_DTEST3,
	PMIC_GPIO_FUNC_INDEX_DTEST4,
};

static const char *const spmi_pmic_gpio_functions[] = {
	[PMIC_GPIO_FUNC_INDEX_NORMAL]	= PMIC_GPIO_FUNC_NORMAL,
	[PMIC_GPIO_FUNC_INDEX_PAIRED]	= PMIC_GPIO_FUNC_PAIRED,
	[PMIC_GPIO_FUNC_INDEX_FUNC1]	= PMIC_GPIO_FUNC_FUNC1,
	[PMIC_GPIO_FUNC_INDEX_FUNC2]	= PMIC_GPIO_FUNC_FUNC2,
	[PMIC_GPIO_FUNC_INDEX_FUNC3]	= PMIC_GPIO_FUNC_FUNC3,
	[PMIC_GPIO_FUNC_INDEX_FUNC4]	= PMIC_GPIO_FUNC_FUNC4,
	[PMIC_GPIO_FUNC_INDEX_DTEST1]	= PMIC_GPIO_FUNC_DTEST1,
	[PMIC_GPIO_FUNC_INDEX_DTEST2]	= PMIC_GPIO_FUNC_DTEST2,
	[PMIC_GPIO_FUNC_INDEX_DTEST3]	= PMIC_GPIO_FUNC_DTEST3,
	[PMIC_GPIO_FUNC_INDEX_DTEST4]	= PMIC_GPIO_FUNC_DTEST4,
};

/**
 * struct spmi_pmic_gpio_pad - keep current GPIO settings
 * @base: Address base in SPMI device.
 * @is_enabled: Set to false when GPIO should be put in high Z state.
 * @out_value: Cached pin output value
 * @have_buffer: Set to true if GPIO output could be configured in push-pull,
 *	open-drain or open-source mode.
 * @output_enabled: Set to true if GPIO output logic is enabled.
 * @input_enabled: Set to true if GPIO input buffer logic is enabled.
 * @analog_pass: Set to true if GPIO is in analog-pass-through mode.
 * @lv_mv_type: Set to true if GPIO subtype is GPIO_LV(0x10) or GPIO_MV(0x11).
 * @num_sources: Number of power-sources supported by this GPIO.
 * @power_source: Current power-source used.
 * @buffer_type: Push-pull, open-drain or open-source.
 * @pullup: Constant current which flow trough GPIO output buffer.
 * @strength: No, Low, Medium, High
 * @function: See spmi_pmic_gpio_functions[]
 * @atest: the ATEST selection for GPIO analog-pass-through mode
 * @dtest_buffer: the DTEST buffer selection for digital input mode.
 */
struct spmi_pmic_gpio_pad {
	u16		base;
	bool		is_enabled;
	bool		out_value;
	bool		have_buffer;
	bool		output_enabled;
	bool		input_enabled;
	bool		analog_pass;
	bool		lv_mv_type;
	unsigned int	num_sources;
	unsigned int	power_source;
	unsigned int	buffer_type;
	unsigned int	pullup;
	unsigned int	strength;
	unsigned int	function;
	unsigned int	atest;
	unsigned int	dtest_buffer;
};

struct qcom_spmi_pmic_gpio_data {
	struct udevice *dev;
	u32 pid; /* Peripheral ID on SPMI bus */
	struct udevice *pmic; /* Reference to pmic device for read/write */
	u32 pin_count;
	struct spmi_pmic_gpio_pad *pads;
};

static int qcom_spmi_pmic_pinctrl_pinconf_set(struct udevice *dev, unsigned int selector,
					      unsigned int param, unsigned int arg);

static int spmi_pmic_gpio_read(struct qcom_spmi_pmic_gpio_data *plat,
			       struct spmi_pmic_gpio_pad *pad,
			       unsigned int addr)
{
	return pmic_reg_read(plat->pmic, pad->base + addr);
}

static int spmi_pmic_gpio_write(struct qcom_spmi_pmic_gpio_data *plat,
				struct spmi_pmic_gpio_pad *pad,
				unsigned int addr, unsigned int val)
{
	return pmic_reg_write(plat->pmic, pad->base + addr, val);
}

static void spmi_pmic_gpio_get_state(struct qcom_spmi_pmic_gpio_data *plat,
				     struct spmi_pmic_gpio_pad *pad,
				     char *buf, int size)
{
	int ret, val, function, cnt;

	static const char *const biases[] = {
		"pull-up 30uA", "pull-up 1.5uA", "pull-up 31.5uA",
		"pull-up 1.5uA + 30uA boost", "pull-down 10uA", "no pull"
	};
	static const char *const buffer_types[] = {
		"push-pull", "open-drain", "open-source"
	};
	static const char *const strengths[] = {
		"no", "low", "medium", "high"
	};

	val = spmi_pmic_gpio_read(plat, pad, PMIC_GPIO_REG_EN_CTL);

	if (val < 0 || !(val >> PMIC_GPIO_REG_MASTER_EN_SHIFT)) {
		cnt = snprintf(buf, size, "disabled");
	} else {
		if (pad->input_enabled) {
			ret = spmi_pmic_gpio_read(plat, pad, PMIC_MPP_REG_RT_STS);
			if (ret < 0)
				return;

			ret &= PMIC_MPP_REG_RT_STS_VAL_MASK;
			pad->out_value = ret;
		}
		/*
		 * For the non-LV/MV subtypes only 2 special functions are
		 * available, offsetting the dtest function values by 2.
		 */
		function = pad->function;
		if (!pad->lv_mv_type &&
		    pad->function >= PMIC_GPIO_FUNC_INDEX_FUNC3)
			function += PMIC_GPIO_FUNC_INDEX_DTEST1 -
				PMIC_GPIO_FUNC_INDEX_FUNC3;

		if (pad->analog_pass)
			cnt = snprintf(buf, size, "analog-pass");
		else
			cnt = snprintf(buf, size, "%-4s",
				       pad->output_enabled ? "out" : "in");
		buf += cnt;
		size -= cnt;

		snprintf(buf, size, " %-4s %-7s vin-%d %-27s %-10s %-7s atest-%d dtest-%d",
			 pad->out_value ? "high" : "low",
			 spmi_pmic_gpio_functions[function],
			 pad->power_source,
			 biases[pad->pullup],
			 buffer_types[pad->buffer_type],
			 strengths[pad->strength],
			 pad->atest,
			 pad->dtest_buffer);
	}
}

static int qcom_spmi_pmic_gpio_set(struct qcom_spmi_pmic_gpio_data *plat,
				   struct spmi_pmic_gpio_pad *pad)
{
	unsigned int val;
	int ret;

	val = pad->power_source << PMIC_GPIO_REG_VIN_SHIFT;

	ret = spmi_pmic_gpio_write(plat, pad, PMIC_GPIO_REG_DIG_VIN_CTL, val);
	if (ret < 0)
		return ret;

	val = pad->pullup << PMIC_GPIO_REG_PULL_SHIFT;

	ret = spmi_pmic_gpio_write(plat, pad, PMIC_GPIO_REG_DIG_PULL_CTL, val);
	if (ret < 0)
		return ret;

	val = pad->buffer_type << PMIC_GPIO_REG_OUT_TYPE_SHIFT;
	val |= pad->strength << PMIC_GPIO_REG_OUT_STRENGTH_SHIFT;

	ret = spmi_pmic_gpio_write(plat, pad, PMIC_GPIO_REG_DIG_OUT_CTL, val);
	if (ret < 0)
		return ret;

	if (pad->dtest_buffer == 0) {
		val = 0;
	} else {
		if (pad->lv_mv_type) {
			val = pad->dtest_buffer - 1;
			val |= PMIC_GPIO_LV_MV_DIG_IN_DTEST_EN;
		} else {
			val = BIT(pad->dtest_buffer - 1);
		}
	}
	ret = spmi_pmic_gpio_write(plat, pad, PMIC_GPIO_REG_DIG_IN_CTL, val);
	if (ret < 0)
		return ret;

	if (pad->analog_pass)
		val = PMIC_GPIO_MODE_ANALOG_PASS_THRU;
	else if (pad->output_enabled && pad->input_enabled)
		val = PMIC_GPIO_MODE_DIGITAL_INPUT_OUTPUT;
	else if (pad->output_enabled)
		val = PMIC_GPIO_MODE_DIGITAL_OUTPUT;
	else
		val = PMIC_GPIO_MODE_DIGITAL_INPUT;

	if (pad->lv_mv_type) {
		ret = spmi_pmic_gpio_write(plat, pad,
					   PMIC_GPIO_REG_MODE_CTL, val);
		if (ret < 0)
			return ret;

		val = pad->atest - 1;
		ret = spmi_pmic_gpio_write(plat, pad,
					   PMIC_GPIO_REG_LV_MV_ANA_PASS_THRU_SEL,
					   val);
		if (ret < 0)
			return ret;

		val = pad->out_value
			<< PMIC_GPIO_LV_MV_OUTPUT_INVERT_SHIFT;
		val |= pad->function
			& PMIC_GPIO_LV_MV_OUTPUT_SOURCE_SEL_MASK;
		ret = spmi_pmic_gpio_write(plat, pad,
					   PMIC_GPIO_REG_LV_MV_DIG_OUT_SOURCE_CTL,
					   val);
		if (ret < 0)
			return ret;
	} else {
		val = val << PMIC_GPIO_REG_MODE_DIR_SHIFT;
		val |= pad->function << PMIC_GPIO_REG_MODE_FUNCTION_SHIFT;
		val |= pad->out_value & PMIC_GPIO_REG_MODE_VALUE_SHIFT;

		ret = spmi_pmic_gpio_write(plat, pad, PMIC_GPIO_REG_MODE_CTL, val);
		if (ret < 0)
			return ret;
	}

	val = pad->is_enabled << PMIC_GPIO_REG_MASTER_EN_SHIFT;

	ret = spmi_pmic_gpio_write(plat, pad, PMIC_GPIO_REG_EN_CTL, val);
	if (ret)
		return ret;

	return 0;
}

static int spmi_pmic_gpio_populate(struct qcom_spmi_pmic_gpio_data *plat,
				   struct spmi_pmic_gpio_pad *pad)
{
	int type, subtype, val, dir;

	type = spmi_pmic_gpio_read(plat, pad, PMIC_GPIO_REG_TYPE);
	if (type < 0)
		return type;

	if (type != PMIC_GPIO_TYPE) {
		dev_err(plat->dev, "incorrect block type 0x%x at 0x%x\n",
			type, pad->base);
		return -ENODEV;
	}

	subtype = spmi_pmic_gpio_read(plat, pad, PMIC_GPIO_REG_SUBTYPE);
	if (subtype < 0)
		return subtype;

	switch (subtype) {
	case PMIC_GPIO_SUBTYPE_GPIO_4CH:
		pad->have_buffer = true;
		fallthrough;
	case PMIC_GPIO_SUBTYPE_GPIOC_4CH:
		pad->num_sources = 4;
		break;
	case PMIC_GPIO_SUBTYPE_GPIO_8CH:
		pad->have_buffer = true;
		fallthrough;
	case PMIC_GPIO_SUBTYPE_GPIOC_8CH:
		pad->num_sources = 8;
		break;
	case PMIC_GPIO_SUBTYPE_GPIO_LV:
		pad->num_sources = 1;
		pad->have_buffer = true;
		pad->lv_mv_type = true;
		break;
	case PMIC_GPIO_SUBTYPE_GPIO_MV:
		pad->num_sources = 2;
		pad->have_buffer = true;
		pad->lv_mv_type = true;
		break;
	case PMIC_GPIO_SUBTYPE_GPIO_LV_VIN2:
		pad->num_sources = 2;
		pad->have_buffer = true;
		pad->lv_mv_type = true;
		break;
	case PMIC_GPIO_SUBTYPE_GPIO_MV_VIN3:
		pad->num_sources = 3;
		pad->have_buffer = true;
		pad->lv_mv_type = true;
		break;
	default:
		dev_err(plat->dev, "unknown GPIO type 0x%x\n", subtype);
		return -ENODEV;
	}

	if (pad->lv_mv_type) {
		val = spmi_pmic_gpio_read(plat, pad,
					  PMIC_GPIO_REG_LV_MV_DIG_OUT_SOURCE_CTL);
		if (val < 0)
			return val;

		pad->out_value = !!(val & PMIC_GPIO_LV_MV_OUTPUT_INVERT);
		pad->function = val & PMIC_GPIO_LV_MV_OUTPUT_SOURCE_SEL_MASK;

		val = spmi_pmic_gpio_read(plat, pad, PMIC_GPIO_REG_MODE_CTL);
		if (val < 0)
			return val;

		dir = val & PMIC_GPIO_REG_LV_MV_MODE_DIR_MASK;
	} else {
		val = spmi_pmic_gpio_read(plat, pad, PMIC_GPIO_REG_MODE_CTL);
		if (val < 0)
			return val;

		pad->out_value = val & PMIC_GPIO_REG_MODE_VALUE_SHIFT;

		dir = val >> PMIC_GPIO_REG_MODE_DIR_SHIFT;
		dir &= PMIC_GPIO_REG_MODE_DIR_MASK;
		pad->function = val >> PMIC_GPIO_REG_MODE_FUNCTION_SHIFT;
		pad->function &= PMIC_GPIO_REG_MODE_FUNCTION_MASK;
	}

	switch (dir) {
	case PMIC_GPIO_MODE_DIGITAL_INPUT:
		pad->input_enabled = true;
		pad->output_enabled = false;
		break;
	case PMIC_GPIO_MODE_DIGITAL_OUTPUT:
		pad->input_enabled = false;
		pad->output_enabled = true;
		break;
	case PMIC_GPIO_MODE_DIGITAL_INPUT_OUTPUT:
		pad->input_enabled = true;
		pad->output_enabled = true;
		break;
	case PMIC_GPIO_MODE_ANALOG_PASS_THRU:
		if (!pad->lv_mv_type)
			return -ENODEV;
		pad->analog_pass = true;
		break;
	default:
		dev_err(plat->dev, "unknown GPIO direction\n");
		return -ENODEV;
	}

	val = spmi_pmic_gpio_read(plat, pad, PMIC_GPIO_REG_DIG_VIN_CTL);
	if (val < 0)
		return val;

	pad->power_source = val >> PMIC_GPIO_REG_VIN_SHIFT;
	pad->power_source &= PMIC_GPIO_REG_VIN_MASK;

	val = spmi_pmic_gpio_read(plat, pad, PMIC_GPIO_REG_DIG_PULL_CTL);
	if (val < 0)
		return val;

	pad->pullup = val >> PMIC_GPIO_REG_PULL_SHIFT;
	pad->pullup &= PMIC_GPIO_REG_PULL_MASK;

	val = spmi_pmic_gpio_read(plat, pad, PMIC_GPIO_REG_DIG_IN_CTL);
	if (val < 0)
		return val;

	if (pad->lv_mv_type && (val & PMIC_GPIO_LV_MV_DIG_IN_DTEST_EN))
		pad->dtest_buffer =
			(val & PMIC_GPIO_LV_MV_DIG_IN_DTEST_SEL_MASK) + 1;
	else if (!pad->lv_mv_type)
		pad->dtest_buffer = ffs(val);
	else
		pad->dtest_buffer = 0;

	val = spmi_pmic_gpio_read(plat, pad, PMIC_GPIO_REG_DIG_OUT_CTL);
	if (val < 0)
		return val;

	pad->strength = val >> PMIC_GPIO_REG_OUT_STRENGTH_SHIFT;
	pad->strength &= PMIC_GPIO_REG_OUT_STRENGTH_MASK;

	pad->buffer_type = val >> PMIC_GPIO_REG_OUT_TYPE_SHIFT;
	pad->buffer_type &= PMIC_GPIO_REG_OUT_TYPE_MASK;

	if (pad->lv_mv_type) {
		val = spmi_pmic_gpio_read(plat, pad,
					  PMIC_GPIO_REG_LV_MV_ANA_PASS_THRU_SEL);
		if (val < 0)
			return val;

		pad->atest = (val & PMIC_GPIO_LV_MV_ANA_MUX_SEL_MASK) + 1;
	}

	/* Pin could be disabled with PIN_CONFIG_BIAS_HIGH_IMPEDANCE */
	pad->is_enabled = true;
	return 0;
}

static int qcom_spmi_pmic_gpio_set_flags(struct udevice *dev, unsigned int offset, ulong flags)
{
	struct qcom_spmi_pmic_gpio_data *plat = dev_get_plat(dev);
	struct spmi_pmic_gpio_pad *pad;

	if (offset >= plat->pin_count)
		return -EINVAL;

	pad = &plat->pads[offset];

	pad->input_enabled = flags & GPIOD_IS_IN;
	pad->output_enabled = flags & GPIOD_IS_OUT;

	if (pad->output_enabled) {
		pad->out_value = flags & GPIOD_IS_OUT_ACTIVE;

		if ((flags & GPIOD_OPEN_DRAIN) && pad->have_buffer)
			pad->buffer_type = PMIC_GPIO_OUT_BUF_OPEN_DRAIN_NMOS;
		else if ((flags & GPIOD_OPEN_SOURCE) && pad->have_buffer)
			pad->buffer_type = PMIC_GPIO_OUT_BUF_OPEN_DRAIN_PMOS;
		else
			pad->buffer_type = PMIC_GPIO_OUT_BUF_CMOS;
	}

	if (flags & GPIOD_PULL_UP)
		pad->pullup = PMIC_GPIO_PULL_UP_30;
	else if (flags & GPIOD_PULL_DOWN)
		pad->pullup = PMIC_GPIO_PULL_DOWN;

	return qcom_spmi_pmic_gpio_set(plat, pad);
}

static int qcom_spmi_pmic_gpio_get_flags(struct udevice *dev, unsigned int offset,
					 ulong *flagsp)
{
	struct qcom_spmi_pmic_gpio_data *plat = dev_get_plat(dev);
	struct spmi_pmic_gpio_pad *pad;
	ulong flags = 0;

	if (offset >= plat->pin_count)
		return -EINVAL;

	pad = &plat->pads[offset];

	if (pad->input_enabled)
		flags |= GPIOD_IS_IN;

	if (pad->output_enabled) {
		flags |= GPIOD_IS_OUT;

		if (pad->out_value)
			flags |= GPIOD_IS_OUT_ACTIVE;

		switch (pad->buffer_type) {
		case PMIC_GPIO_OUT_BUF_OPEN_DRAIN_NMOS:
			flags |= GPIOD_OPEN_DRAIN;
			break;
		case PMIC_GPIO_OUT_BUF_OPEN_DRAIN_PMOS:
			flags |= GPIOD_OPEN_SOURCE;
			break;
		}
	}

	if (pad->pullup == PMIC_GPIO_PULL_DOWN)
		flags |= GPIOD_PULL_DOWN;
	else if (pad->pullup != PMIC_GPIO_PULL_DISABLE)
		flags |= GPIOD_PULL_UP;

	if (pad->analog_pass)
		flags |= GPIOD_IS_AF;

	*flagsp = flags;

	return 0;
}

static int qcom_spmi_pmic_gpio_get_value(struct udevice *dev, unsigned int offset)
{
	struct qcom_spmi_pmic_gpio_data *plat = dev_get_plat(dev);
	struct spmi_pmic_gpio_pad *pad;
	int ret;

	if (offset >= plat->pin_count)
		return -EINVAL;

	pad = &plat->pads[offset];

	if (!pad->is_enabled)
		return -EINVAL;

	if (pad->input_enabled) {
		ret = spmi_pmic_gpio_read(plat, 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 int qcom_spmi_pmic_gpio_get_function(struct udevice *dev, unsigned int offset)
{
	struct qcom_spmi_pmic_gpio_data *plat = dev_get_plat(dev);
	struct spmi_pmic_gpio_pad *pad;
	int val;

	if (offset >= plat->pin_count)
		return GPIOF_UNKNOWN;

	pad = &plat->pads[offset];

	val = spmi_pmic_gpio_read(plat, pad, PMIC_GPIO_REG_EN_CTL);
	if (!(val >> PMIC_GPIO_REG_MASTER_EN_SHIFT))
		return GPIOF_UNKNOWN;
	else if (pad->analog_pass)
		return GPIOF_FUNC;
	else if (pad->output_enabled)
		return GPIOF_OUTPUT;

	return GPIOF_INPUT;
}

static int qcom_spmi_pmic_gpio_xlate(struct udevice *dev, struct gpio_desc *desc,
				     struct ofnode_phandle_args *args)
{
	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);

	if (args->args_count < 1)
		return -EINVAL;

	/* GPIOs in DT are 1-based */
	desc->offset = args->args[0] - 1;
	if (desc->offset >= uc_priv->gpio_count)
		return -EINVAL;

	if (args->args_count < 2)
		return 0;

	desc->flags = gpio_flags_xlate(args->args[1]);

	return 0;
}

static const struct dm_gpio_ops qcom_spmi_pmic_gpio_ops = {
	.set_flags		= qcom_spmi_pmic_gpio_set_flags,
	.get_flags		= qcom_spmi_pmic_gpio_get_flags,
	.get_value		= qcom_spmi_pmic_gpio_get_value,
	.get_function		= qcom_spmi_pmic_gpio_get_function,
	.xlate			= qcom_spmi_pmic_gpio_xlate,
};

static int qcom_spmi_pmic_gpio_bind(struct udevice *dev)
{
	struct qcom_spmi_pmic_gpio_data *plat = dev_get_plat(dev);
	struct udevice *child;
	struct driver *drv;
	int ret;

	drv = lists_driver_lookup_name("qcom_spmi_pmic_pinctrl");
	if (!drv) {
		log_warning("Cannot find driver '%s'\n", "qcom_spmi_pmic_pinctrl");
		return -ENOENT;
	}

	/* Bind the GPIO driver as a child of the PMIC. */
	ret = device_bind_with_driver_data(dev, drv,
					   dev->name,
					   0, dev_ofnode(dev), &child);
	if (ret)
		return log_msg_ret("bind", ret);

	dev_set_plat(child, plat);

	return 0;
}

static int qcom_spmi_pmic_gpio_probe(struct udevice *dev)
{
	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
	struct qcom_spmi_pmic_gpio_data *plat = dev_get_plat(dev);
	struct ofnode_phandle_args args;
	int i, ret;
	u64 pid;

	plat->dev = dev;
	plat->pmic = dev->parent;

	pid = dev_read_addr(dev);
	if (pid == FDT_ADDR_T_NONE)
		return log_msg_ret("bad address", -EINVAL);

	plat->pid = pid;

	/*
	 * Parse basic GPIO count specified via the gpio-ranges property
	 * as specified in upstream devicetrees
	 */
	ret = ofnode_parse_phandle_with_args(dev_ofnode(dev), "gpio-ranges",
					     NULL, 3, 0, &args);
	if (ret)
		return log_msg_ret("gpio-ranges", ret);

	plat->pin_count = min_t(u32, args.args[2], PMIC_MAX_GPIOS);

	uc_priv->gpio_count = plat->pin_count;

	uc_priv->bank_name = strchr(dev_read_string(dev, "compatible"), ',');
	if (uc_priv->bank_name)
		uc_priv->bank_name += 1; /* skip the , */
	else
		uc_priv->bank_name = dev->name;

	plat->pads = calloc(plat->pin_count, sizeof(struct spmi_pmic_gpio_pad));
	if (!plat->pads)
		return -ENOMEM;

	for (i = 0; i < plat->pin_count; ++i) {
		struct spmi_pmic_gpio_pad *pad = &plat->pads[i];

		pad->base = plat->pid + i * PMIC_GPIO_ADDRESS_RANGE;

		ret = spmi_pmic_gpio_populate(plat, pad);
		if (ret < 0)
			return ret;
	}

	return 0;
}

static const struct udevice_id qcom_spmi_pmic_gpio_ids[] = {
	{ .compatible = "qcom,pm8550-gpio" },
	{ .compatible = "qcom,pm8550b-gpio" },
	{ .compatible = "qcom,pm8550ve-gpio" },
	{ .compatible = "qcom,pm8550vs-gpio" },
	{ .compatible = "qcom,pmk8550-gpio" },
	{ .compatible = "qcom,pmr735d-gpio" },
	{ }
};

U_BOOT_DRIVER(qcom_spmi_pmic_gpio) = {
	.name	= "qcom_spmi_pmic_gpio",
	.id	= UCLASS_GPIO,
	.of_match = qcom_spmi_pmic_gpio_ids,
	.bind	= qcom_spmi_pmic_gpio_bind,
	.probe = qcom_spmi_pmic_gpio_probe,
	.ops	= &qcom_spmi_pmic_gpio_ops,
	.plat_auto = sizeof(struct qcom_spmi_pmic_gpio_data),
	.flags = DM_FLAG_ALLOC_PDATA,
};

/* Qualcomm specific pin configurations */
#define PMIC_GPIO_CONF_PULL_UP			(PIN_CONFIG_END + 1)
#define PMIC_GPIO_CONF_STRENGTH			(PIN_CONFIG_END + 2)
#define PMIC_GPIO_CONF_ATEST			(PIN_CONFIG_END + 3)
#define PMIC_GPIO_CONF_ANALOG_PASS		(PIN_CONFIG_END + 4)
#define PMIC_GPIO_CONF_DTEST_BUFFER		(PIN_CONFIG_END + 5)

static const struct pinconf_param qcom_spmi_pmic_pinctrl_conf_params[] = {
	{ "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 },
	{ "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
	{ "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
	{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
	{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, PMIC_GPIO_PULL_UP_30 },
	{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_UP, 0 },
	{ "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
	{ "power-source", PIN_CONFIG_POWER_SOURCE, 0 },
	{ "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
	{ "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
	{ "output-disable", PIN_CONFIG_OUTPUT_ENABLE, 0 },
	{ "output-enable", PIN_CONFIG_OUTPUT_ENABLE, 1 },
	{ "output-high", PIN_CONFIG_OUTPUT, 1 },
	{ "output-low", PIN_CONFIG_OUTPUT, 0 },
	{ "qcom,pull-up-strength", PMIC_GPIO_CONF_PULL_UP, 0},
	{ "qcom,drive-strength", PMIC_GPIO_CONF_STRENGTH, 0},
	{ "qcom,atest",	PMIC_GPIO_CONF_ATEST, 0},
	{ "qcom,analog-pass", PMIC_GPIO_CONF_ANALOG_PASS, 0},
	{ "qcom,dtest-buffer", PMIC_GPIO_CONF_DTEST_BUFFER, 0},
};

static int qcom_spmi_pmic_pinctrl_get_pins_count(struct udevice *dev)
{
	struct qcom_spmi_pmic_gpio_data *plat = dev_get_plat(dev);

	return plat->pin_count;
}

static const char *qcom_spmi_pmic_pinctrl_get_pin_name(struct udevice *dev,
						       unsigned int selector)
{
	static char name[8];

	/* DT indexes from 1 */
	snprintf(name, sizeof(name), "gpio%u", selector + 1);

	return name;
}

static int qcom_spmi_pmic_pinctrl_get_pin_muxing(struct udevice *dev,
						 unsigned int selector,
						 char *buf, int size)
{
	struct qcom_spmi_pmic_gpio_data *plat = dev_get_plat(dev);
	struct spmi_pmic_gpio_pad *pad;

	if (selector >= plat->pin_count)
		return -EINVAL;

	pad = &plat->pads[selector];

	spmi_pmic_gpio_get_state(plat, pad, buf, size);

	return 0;
}

static int qcom_spmi_pmic_pinctrl_pinconf_set(struct udevice *dev, unsigned int selector,
					      unsigned int param, unsigned int arg)
{
	struct qcom_spmi_pmic_gpio_data *plat = dev_get_plat(dev);
	struct spmi_pmic_gpio_pad *pad;

	if (selector >= plat->pin_count)
		return -EINVAL;

	pad = &plat->pads[selector];
	pad->is_enabled = true;

	switch (param) {
	case PIN_CONFIG_DRIVE_PUSH_PULL:
		pad->buffer_type = PMIC_GPIO_OUT_BUF_CMOS;
		break;
	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
		if (!pad->have_buffer)
			return -EINVAL;
		pad->buffer_type = PMIC_GPIO_OUT_BUF_OPEN_DRAIN_NMOS;
		break;
	case PIN_CONFIG_DRIVE_OPEN_SOURCE:
		if (!pad->have_buffer)
			return -EINVAL;
		pad->buffer_type = PMIC_GPIO_OUT_BUF_OPEN_DRAIN_PMOS;
		break;
	case PIN_CONFIG_BIAS_DISABLE:
		pad->pullup = PMIC_GPIO_PULL_DISABLE;
		break;
	case PIN_CONFIG_BIAS_PULL_UP:
		pad->pullup = PMIC_GPIO_PULL_UP_30;
		break;
	case PIN_CONFIG_BIAS_PULL_DOWN:
		if (arg)
			pad->pullup = PMIC_GPIO_PULL_DOWN;
		else
			pad->pullup = PMIC_GPIO_PULL_DISABLE;
		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_ENABLE:
		pad->output_enabled = arg ? true : false;
		break;
	case PIN_CONFIG_OUTPUT:
		pad->output_enabled = true;
		pad->out_value = arg;
		break;
	case PMIC_GPIO_CONF_PULL_UP:
		if (arg > PMIC_GPIO_PULL_UP_1P5_30)
			return -EINVAL;
		pad->pullup = arg;
		break;
	case PMIC_GPIO_CONF_STRENGTH:
		if (arg > PMIC_GPIO_STRENGTH_LOW)
			return -EINVAL;
		switch (arg) {
		case PMIC_GPIO_STRENGTH_HIGH:
			pad->strength = PMIC_GPIO_OUT_STRENGTH_HIGH;
			break;
		case PMIC_GPIO_STRENGTH_LOW:
			pad->strength = PMIC_GPIO_OUT_STRENGTH_LOW;
			break;
		default:
			pad->strength = arg;
			break;
		}
		break;
	case PMIC_GPIO_CONF_ATEST:
		if (!pad->lv_mv_type || arg > 4)
			return -EINVAL;
		pad->atest = arg;
		break;
	case PMIC_GPIO_CONF_ANALOG_PASS:
		if (!pad->lv_mv_type)
			return -EINVAL;
		pad->analog_pass = true;
		break;
	case PMIC_GPIO_CONF_DTEST_BUFFER:
		if (arg > 4)
			return -EINVAL;
		pad->dtest_buffer = arg;
		break;
	default:
		return -EINVAL;
	}

	return qcom_spmi_pmic_gpio_set(plat, pad);
}

static const char *qcom_spmi_pmic_pinctrl_get_function_name(struct udevice *dev,
							    unsigned int selector)
{
	if (selector >= ARRAY_SIZE(spmi_pmic_gpio_functions))
		return NULL;

	return spmi_pmic_gpio_functions[selector];
}

static int qcom_spmi_pmic_pinctrl_get_functions_count(struct udevice *dev)
{
	return ARRAY_SIZE(spmi_pmic_gpio_functions);
}

static int qcom_spmi_pmic_pinctrl_pinmux_set_mux(struct udevice *dev, unsigned int selector,
						 unsigned int function)
{
	struct qcom_spmi_pmic_gpio_data *plat = dev_get_plat(dev);
	struct spmi_pmic_gpio_pad *pad;
	unsigned int val;
	int ret;

	if (selector >= plat->pin_count)
		return -EINVAL;

	pad = &plat->pads[selector];

	/*
	 * Non-LV/MV subtypes only support 2 special functions,
	 * offsetting the dtestx function values by 2
	 */
	if (!pad->lv_mv_type) {
		if (function == PMIC_GPIO_FUNC_INDEX_FUNC3 ||
		    function == PMIC_GPIO_FUNC_INDEX_FUNC4) {
			pr_err("LV/MV subtype doesn't have func3/func4\n");
			return -EINVAL;
		}
		if (function >= PMIC_GPIO_FUNC_INDEX_DTEST1)
			function -= (PMIC_GPIO_FUNC_INDEX_DTEST1 -
					PMIC_GPIO_FUNC_INDEX_FUNC3);
	}

	pad->function = function;

	if (pad->analog_pass)
		val = PMIC_GPIO_MODE_ANALOG_PASS_THRU;
	else if (pad->output_enabled && pad->input_enabled)
		val = PMIC_GPIO_MODE_DIGITAL_INPUT_OUTPUT;
	else if (pad->output_enabled)
		val = PMIC_GPIO_MODE_DIGITAL_OUTPUT;
	else
		val = PMIC_GPIO_MODE_DIGITAL_INPUT;

	if (pad->lv_mv_type) {
		ret = spmi_pmic_gpio_write(plat, pad,
					   PMIC_GPIO_REG_MODE_CTL, val);
		if (ret < 0)
			return ret;

		val = pad->atest - 1;
		ret = spmi_pmic_gpio_write(plat, pad,
					   PMIC_GPIO_REG_LV_MV_ANA_PASS_THRU_SEL,
					   val);
		if (ret < 0)
			return ret;

		val = pad->out_value
			<< PMIC_GPIO_LV_MV_OUTPUT_INVERT_SHIFT;
		val |= pad->function
			& PMIC_GPIO_LV_MV_OUTPUT_SOURCE_SEL_MASK;
		ret = spmi_pmic_gpio_write(plat, pad,
					   PMIC_GPIO_REG_LV_MV_DIG_OUT_SOURCE_CTL,
					   val);
		if (ret < 0)
			return ret;
	} else {
		val = val << PMIC_GPIO_REG_MODE_DIR_SHIFT;
		val |= pad->function << PMIC_GPIO_REG_MODE_FUNCTION_SHIFT;
		val |= pad->out_value & PMIC_GPIO_REG_MODE_VALUE_SHIFT;

		ret = spmi_pmic_gpio_write(plat, pad, PMIC_GPIO_REG_MODE_CTL, val);
		if (ret < 0)
			return ret;
	}

	val = pad->is_enabled << PMIC_GPIO_REG_MASTER_EN_SHIFT;

	return spmi_pmic_gpio_write(plat, pad, PMIC_GPIO_REG_EN_CTL, val);
}

struct pinctrl_ops qcom_spmi_pmic_pinctrl_ops = {
	.get_pins_count = qcom_spmi_pmic_pinctrl_get_pins_count,
	.get_pin_name = qcom_spmi_pmic_pinctrl_get_pin_name,
	.set_state = pinctrl_generic_set_state,
	.pinconf_num_params = ARRAY_SIZE(qcom_spmi_pmic_pinctrl_conf_params),
	.pinconf_params = qcom_spmi_pmic_pinctrl_conf_params,
	.pinconf_set = qcom_spmi_pmic_pinctrl_pinconf_set,
	.get_function_name = qcom_spmi_pmic_pinctrl_get_function_name,
	.get_functions_count = qcom_spmi_pmic_pinctrl_get_functions_count,
	.pinmux_set = qcom_spmi_pmic_pinctrl_pinmux_set_mux,
	.get_pin_muxing = qcom_spmi_pmic_pinctrl_get_pin_muxing,
};

U_BOOT_DRIVER(qcom_spmi_pmic_pinctrl) = {
	.name	= "qcom_spmi_pmic_pinctrl",
	.id	= UCLASS_PINCTRL,
	.ops	= &qcom_spmi_pmic_pinctrl_ops,
};