drivers/pinctrl/pinctrl-axp209.c - third_party/kernel - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * AXP20x pinctrl and GPIO driver
  *
  * Copyright (C) 2016 Maxime Ripard <maxime.ripard@free-electrons.com>
  * Copyright (C) 2017 Quentin Schulz <quentin.schulz@free-electrons.com>
  */

 #include <linux/bitops.h>
 #include <linux/device.h>
 #include <linux/gpio/driver.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/mfd/axp20x.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/pinctrl/pinconf-generic.h>
 #include <linux/pinctrl/pinctrl.h>
 #include <linux/pinctrl/pinmux.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/slab.h>

 #define AXP20X_GPIO_FUNCTIONS		0x7
 #define AXP20X_GPIO_FUNCTION_OUT_LOW	0
 #define AXP20X_GPIO_FUNCTION_OUT_HIGH	1
 #define AXP20X_GPIO_FUNCTION_INPUT	2

 #define AXP20X_FUNC_GPIO_OUT		0
 #define AXP20X_FUNC_GPIO_IN		1
 #define AXP20X_FUNC_LDO			2
 #define AXP20X_FUNC_ADC			3
 #define AXP20X_FUNCS_NB			4

 #define AXP20X_MUX_GPIO_OUT		0
 #define AXP20X_MUX_GPIO_IN		BIT(1)
 #define AXP20X_MUX_ADC			BIT(2)

 #define AXP813_MUX_ADC			(BIT(2) | BIT(0))

 struct axp20x_pctrl_desc {
 	const struct pinctrl_pin_desc	*pins;
 	unsigned int			npins;
 	/* Stores the pins supporting LDO function. Bit offset is pin number. */
 	u8				ldo_mask;
 	/* Stores the pins supporting ADC function. Bit offset is pin number. */
 	u8				adc_mask;
 	u8				gpio_status_offset;
 	u8				adc_mux;
 };

 struct axp20x_pinctrl_function {
 	const char	*name;
 	unsigned int	muxval;
 	const char	**groups;
 	unsigned int	ngroups;
 };

 struct axp20x_pctl {
 	struct gpio_chip	chip;
 	struct regmap		*regmap;
 	struct pinctrl_dev			*pctl_dev;
 	struct device				*dev;
 	const struct axp20x_pctrl_desc		*desc;
 	struct axp20x_pinctrl_function		funcs[AXP20X_FUNCS_NB];
 };

 static const struct pinctrl_pin_desc axp209_pins[] = {
 	PINCTRL_PIN(0, "GPIO0"),
 	PINCTRL_PIN(1, "GPIO1"),
 	PINCTRL_PIN(2, "GPIO2"),
 };

 static const struct pinctrl_pin_desc axp813_pins[] = {
 	PINCTRL_PIN(0, "GPIO0"),
 	PINCTRL_PIN(1, "GPIO1"),
 };

 static const struct axp20x_pctrl_desc axp20x_data = {
 	.pins	= axp209_pins,
 	.npins	= ARRAY_SIZE(axp209_pins),
 	.ldo_mask = BIT(0) | BIT(1),
 	.adc_mask = BIT(0) | BIT(1),
 	.gpio_status_offset = 4,
 	.adc_mux = AXP20X_MUX_ADC,
 };

 static const struct axp20x_pctrl_desc axp813_data = {
 	.pins	= axp813_pins,
 	.npins	= ARRAY_SIZE(axp813_pins),
 	.ldo_mask = BIT(0) | BIT(1),
 	.adc_mask = BIT(0),
 	.gpio_status_offset = 0,
 	.adc_mux = AXP813_MUX_ADC,
 };

 static int axp20x_gpio_get_reg(unsigned int offset)
 {
 	switch (offset) {
 	case 0:
 		return AXP20X_GPIO0_CTRL;
 	case 1:
 		return AXP20X_GPIO1_CTRL;
 	case 2:
 		return AXP20X_GPIO2_CTRL;
 	}

 	return -EINVAL;
 }

 static int axp20x_gpio_input(struct gpio_chip *chip, unsigned int offset)
 {
 	return pinctrl_gpio_direction_input(chip->base + offset);
 }

 static int axp20x_gpio_get(struct gpio_chip *chip, unsigned int offset)
 {
 	struct axp20x_pctl *pctl = gpiochip_get_data(chip);
 	unsigned int val;
 	int ret;

 	ret = regmap_read(pctl->regmap, AXP20X_GPIO20_SS, &val);
 	if (ret)
 		return ret;

 	return !!(val & BIT(offset + pctl->desc->gpio_status_offset));
 }

 static int axp20x_gpio_get_direction(struct gpio_chip *chip,
 				     unsigned int offset)
 {
 	struct axp20x_pctl *pctl = gpiochip_get_data(chip);
 	unsigned int val;
 	int reg, ret;

 	reg = axp20x_gpio_get_reg(offset);
 	if (reg < 0)
 		return reg;

 	ret = regmap_read(pctl->regmap, reg, &val);
 	if (ret)
 		return ret;

 	/*
 	 * This shouldn't really happen if the pin is in use already,
 	 * or if it's not in use yet, it doesn't matter since we're
 	 * going to change the value soon anyway. Default to output.
 	 */
 	if ((val & AXP20X_GPIO_FUNCTIONS) > 2)
 		return 0;

 	/*
 	 * The GPIO directions are the three lowest values.
 	 * 2 is input, 0 and 1 are output
 	 */
 	return val & 2;
 }

 static int axp20x_gpio_output(struct gpio_chip *chip, unsigned int offset,
 			      int value)
 {
 	chip->set(chip, offset, value);

 	return 0;
 }

 static void axp20x_gpio_set(struct gpio_chip *chip, unsigned int offset,
 			    int value)
 {
 	struct axp20x_pctl *pctl = gpiochip_get_data(chip);
 	int reg;

 	reg = axp20x_gpio_get_reg(offset);
 	if (reg < 0)
 		return;

 	regmap_update_bits(pctl->regmap, reg,
 			   AXP20X_GPIO_FUNCTIONS,
 			   value ? AXP20X_GPIO_FUNCTION_OUT_HIGH :
 			   AXP20X_GPIO_FUNCTION_OUT_LOW);
 }

 static int axp20x_pmx_set(struct pinctrl_dev *pctldev, unsigned int offset,
 			  u8 config)
 {
 	struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);
 	int reg;

 	reg = axp20x_gpio_get_reg(offset);
 	if (reg < 0)
 		return reg;

 	return regmap_update_bits(pctl->regmap, reg, AXP20X_GPIO_FUNCTIONS,
 				  config);
 }

 static int axp20x_pmx_func_cnt(struct pinctrl_dev *pctldev)
 {
 	struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);

 	return ARRAY_SIZE(pctl->funcs);
 }

 static const char *axp20x_pmx_func_name(struct pinctrl_dev *pctldev,
 					unsigned int selector)
 {
 	struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);

 	return pctl->funcs[selector].name;
 }

 static int axp20x_pmx_func_groups(struct pinctrl_dev *pctldev,
 				  unsigned int selector,
 				  const char * const **groups,
 				  unsigned int *num_groups)
 {
 	struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);

 	*groups = pctl->funcs[selector].groups;
 	*num_groups = pctl->funcs[selector].ngroups;

 	return 0;
 }

 static int axp20x_pmx_set_mux(struct pinctrl_dev *pctldev,
 			      unsigned int function, unsigned int group)
 {
 	struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);
 	unsigned int mask;

 	/* Every pin supports GPIO_OUT and GPIO_IN functions */
 	if (function <= AXP20X_FUNC_GPIO_IN)
 		return axp20x_pmx_set(pctldev, group,
 				      pctl->funcs[function].muxval);

 	if (function == AXP20X_FUNC_LDO)
 		mask = pctl->desc->ldo_mask;
 	else
 		mask = pctl->desc->adc_mask;

 	if (!(BIT(group) & mask))
 		return -EINVAL;

 	/*
 	 * We let the regulator framework handle the LDO muxing as muxing bits
 	 * are basically also regulators on/off bits. It's better not to enforce
 	 * any state of the regulator when selecting LDO mux so that we don't
 	 * interfere with the regulator driver.
 	 */
 	if (function == AXP20X_FUNC_LDO)
 		return 0;

 	return axp20x_pmx_set(pctldev, group, pctl->funcs[function].muxval);
 }

 static int axp20x_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
 					 struct pinctrl_gpio_range *range,
 					 unsigned int offset, bool input)
 {
 	struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);

 	if (input)
 		return axp20x_pmx_set(pctldev, offset,
 				      pctl->funcs[AXP20X_FUNC_GPIO_IN].muxval);

 	return axp20x_pmx_set(pctldev, offset,
 			      pctl->funcs[AXP20X_FUNC_GPIO_OUT].muxval);
 }

 static const struct pinmux_ops axp20x_pmx_ops = {
 	.get_functions_count	= axp20x_pmx_func_cnt,
 	.get_function_name	= axp20x_pmx_func_name,
 	.get_function_groups	= axp20x_pmx_func_groups,
 	.set_mux		= axp20x_pmx_set_mux,
 	.gpio_set_direction	= axp20x_pmx_gpio_set_direction,
 	.strict			= true,
 };

 static int axp20x_groups_cnt(struct pinctrl_dev *pctldev)
 {
 	struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);

 	return pctl->desc->npins;
 }

 static int axp20x_group_pins(struct pinctrl_dev *pctldev, unsigned int selector,
 			     const unsigned int **pins, unsigned int *num_pins)
 {
 	struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);

 	*pins = (unsigned int *)&pctl->desc->pins[selector];
 	*num_pins = 1;

 	return 0;
 }

 static const char *axp20x_group_name(struct pinctrl_dev *pctldev,
 				     unsigned int selector)
 {
 	struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);

 	return pctl->desc->pins[selector].name;
 }

 static const struct pinctrl_ops axp20x_pctrl_ops = {
 	.dt_node_to_map		= pinconf_generic_dt_node_to_map_group,
 	.dt_free_map		= pinconf_generic_dt_free_map,
 	.get_groups_count	= axp20x_groups_cnt,
 	.get_group_name		= axp20x_group_name,
 	.get_group_pins		= axp20x_group_pins,
 };

 static int axp20x_funcs_groups_from_mask(struct device *dev, unsigned int mask,
 					  unsigned int mask_len,
 					  struct axp20x_pinctrl_function *func,
 					  const struct pinctrl_pin_desc *pins)
 {
 	unsigned long int mask_cpy = mask;
 	const char **group;
 	unsigned int ngroups = hweight8(mask);
 	int bit;

 	func->ngroups = ngroups;
 	if (func->ngroups > 0) {
 		func->groups = devm_kcalloc(dev,
 					    ngroups, sizeof(const char *),
 					    GFP_KERNEL);
 		if (!func->groups)
 			return -ENOMEM;
 		group = func->groups;
 		for_each_set_bit(bit, &mask_cpy, mask_len) {
 			*group = pins[bit].name;
 			group++;
 		}
 	}

 	return 0;
 }

 static int axp20x_build_funcs_groups(struct platform_device *pdev)
 {
 	struct axp20x_pctl *pctl = platform_get_drvdata(pdev);
 	int i, ret, pin, npins = pctl->desc->npins;

 	pctl->funcs[AXP20X_FUNC_GPIO_OUT].name = "gpio_out";
 	pctl->funcs[AXP20X_FUNC_GPIO_OUT].muxval = AXP20X_MUX_GPIO_OUT;
 	pctl->funcs[AXP20X_FUNC_GPIO_IN].name = "gpio_in";
 	pctl->funcs[AXP20X_FUNC_GPIO_IN].muxval = AXP20X_MUX_GPIO_IN;
 	pctl->funcs[AXP20X_FUNC_LDO].name = "ldo";
 	/*
 	 * Muxval for LDO is useless as we won't use it.
 	 * See comment in axp20x_pmx_set_mux.
 	 */
 	pctl->funcs[AXP20X_FUNC_ADC].name = "adc";
 	pctl->funcs[AXP20X_FUNC_ADC].muxval = pctl->desc->adc_mux;

 	/* Every pin supports GPIO_OUT and GPIO_IN functions */
 	for (i = 0; i <= AXP20X_FUNC_GPIO_IN; i++) {
 		pctl->funcs[i].ngroups = npins;
 		pctl->funcs[i].groups = devm_kcalloc(&pdev->dev,
 						     npins, sizeof(char *),
 						     GFP_KERNEL);
 		if (!pctl->funcs[i].groups)
 			return -ENOMEM;
 		for (pin = 0; pin < npins; pin++)
 			pctl->funcs[i].groups[pin] = pctl->desc->pins[pin].name;
 	}

 	ret = axp20x_funcs_groups_from_mask(&pdev->dev, pctl->desc->ldo_mask,
 				      npins, &pctl->funcs[AXP20X_FUNC_LDO],
 				      pctl->desc->pins);
 	if (ret)
 		return ret;

 	ret = axp20x_funcs_groups_from_mask(&pdev->dev, pctl->desc->adc_mask,
 				      npins, &pctl->funcs[AXP20X_FUNC_ADC],
 				      pctl->desc->pins);
 	if (ret)
 		return ret;

 	return 0;
 }

 static const struct of_device_id axp20x_pctl_match[] = {
 	{ .compatible = "x-powers,axp209-gpio", .data = &axp20x_data, },
 	{ .compatible = "x-powers,axp813-gpio", .data = &axp813_data, },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, axp20x_pctl_match);

 static int axp20x_pctl_probe(struct platform_device *pdev)
 {
 	struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 	struct axp20x_pctl *pctl;
 	struct device *dev = &pdev->dev;
 	struct pinctrl_desc *pctrl_desc;
 	int ret;

 	if (!of_device_is_available(pdev->dev.of_node))
 		return -ENODEV;

 	if (!axp20x) {
 		dev_err(&pdev->dev, "Parent drvdata not set\n");
 		return -EINVAL;
 	}

 	pctl = devm_kzalloc(&pdev->dev, sizeof(*pctl), GFP_KERNEL);
 	if (!pctl)
 		return -ENOMEM;

 	pctl->chip.base			= -1;
 	pctl->chip.can_sleep		= true;
 	pctl->chip.request		= gpiochip_generic_request;
 	pctl->chip.free			= gpiochip_generic_free;
 	pctl->chip.parent		= &pdev->dev;
 	pctl->chip.label		= dev_name(&pdev->dev);
 	pctl->chip.owner		= THIS_MODULE;
 	pctl->chip.get			= axp20x_gpio_get;
 	pctl->chip.get_direction	= axp20x_gpio_get_direction;
 	pctl->chip.set			= axp20x_gpio_set;
 	pctl->chip.direction_input	= axp20x_gpio_input;
 	pctl->chip.direction_output	= axp20x_gpio_output;

 	pctl->desc = of_device_get_match_data(dev);

 	pctl->chip.ngpio		= pctl->desc->npins;

 	pctl->regmap = axp20x->regmap;
 	pctl->dev = &pdev->dev;

 	platform_set_drvdata(pdev, pctl);

 	ret = axp20x_build_funcs_groups(pdev);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to build groups\n");
 		return ret;
 	}

 	pctrl_desc = devm_kzalloc(&pdev->dev, sizeof(*pctrl_desc), GFP_KERNEL);
 	if (!pctrl_desc)
 		return -ENOMEM;

 	pctrl_desc->name = dev_name(&pdev->dev);
 	pctrl_desc->owner = THIS_MODULE;
 	pctrl_desc->pins = pctl->desc->pins;
 	pctrl_desc->npins = pctl->desc->npins;
 	pctrl_desc->pctlops = &axp20x_pctrl_ops;
 	pctrl_desc->pmxops = &axp20x_pmx_ops;

 	pctl->pctl_dev = devm_pinctrl_register(&pdev->dev, pctrl_desc, pctl);
 	if (IS_ERR(pctl->pctl_dev)) {
 		dev_err(&pdev->dev, "couldn't register pinctrl driver\n");
 		return PTR_ERR(pctl->pctl_dev);
 	}

 	ret = devm_gpiochip_add_data(&pdev->dev, &pctl->chip, pctl);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to register GPIO chip\n");
 		return ret;
 	}

 	ret = gpiochip_add_pin_range(&pctl->chip, dev_name(&pdev->dev),
 				     pctl->desc->pins->number,
 				     pctl->desc->pins->number,
 				     pctl->desc->npins);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to add pin range\n");
 		return ret;
 	}

 	dev_info(&pdev->dev, "AXP209 pinctrl and GPIO driver loaded\n");

 	return 0;
 }

 static struct platform_driver axp20x_pctl_driver = {
 	.probe		= axp20x_pctl_probe,
 	.driver = {
 		.name		= "axp20x-gpio",
 		.of_match_table	= axp20x_pctl_match,
 	},
 };

 module_platform_driver(axp20x_pctl_driver);

 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
 MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
 MODULE_DESCRIPTION("AXP20x PMIC pinctrl and GPIO driver");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* AXP20x pinctrl and GPIO driver
	*
	* Copyright (C) 2016 Maxime Ripard <maxime.ripard@free-electrons.com>
	* Copyright (C) 2017 Quentin Schulz <quentin.schulz@free-electrons.com>
	*/

	#include <linux/bitops.h>
	#include <linux/device.h>
	#include <linux/gpio/driver.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/kernel.h>
	#include <linux/mfd/axp20x.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/of_device.h>
	#include <linux/pinctrl/pinconf-generic.h>
	#include <linux/pinctrl/pinctrl.h>
	#include <linux/pinctrl/pinmux.h>
	#include <linux/platform_device.h>
	#include <linux/regmap.h>
	#include <linux/slab.h>

	#define AXP20X_GPIO_FUNCTIONS 0x7
	#define AXP20X_GPIO_FUNCTION_OUT_LOW 0
	#define AXP20X_GPIO_FUNCTION_OUT_HIGH 1
	#define AXP20X_GPIO_FUNCTION_INPUT 2

	#define AXP20X_FUNC_GPIO_OUT 0
	#define AXP20X_FUNC_GPIO_IN 1
	#define AXP20X_FUNC_LDO 2
	#define AXP20X_FUNC_ADC 3
	#define AXP20X_FUNCS_NB 4

	#define AXP20X_MUX_GPIO_OUT 0
	#define AXP20X_MUX_GPIO_IN BIT(1)
	#define AXP20X_MUX_ADC BIT(2)

	#define AXP813_MUX_ADC (BIT(2) \| BIT(0))

	struct axp20x_pctrl_desc {
	const struct pinctrl_pin_desc *pins;
	unsigned int npins;
	/* Stores the pins supporting LDO function. Bit offset is pin number. */
	u8 ldo_mask;
	/* Stores the pins supporting ADC function. Bit offset is pin number. */
	u8 adc_mask;
	u8 gpio_status_offset;
	u8 adc_mux;
	};

	struct axp20x_pinctrl_function {
	const char *name;
	unsigned int muxval;
	const char **groups;
	unsigned int ngroups;
	};

	struct axp20x_pctl {
	struct gpio_chip chip;
	struct regmap *regmap;
	struct pinctrl_dev *pctl_dev;
	struct device *dev;
	const struct axp20x_pctrl_desc *desc;
	struct axp20x_pinctrl_function funcs[AXP20X_FUNCS_NB];
	};

	static const struct pinctrl_pin_desc axp209_pins[] = {
	PINCTRL_PIN(0, "GPIO0"),
	PINCTRL_PIN(1, "GPIO1"),
	PINCTRL_PIN(2, "GPIO2"),
	};

	static const struct pinctrl_pin_desc axp813_pins[] = {
	PINCTRL_PIN(0, "GPIO0"),
	PINCTRL_PIN(1, "GPIO1"),
	};

	static const struct axp20x_pctrl_desc axp20x_data = {
	.pins = axp209_pins,
	.npins = ARRAY_SIZE(axp209_pins),
	.ldo_mask = BIT(0) \| BIT(1),
	.adc_mask = BIT(0) \| BIT(1),
	.gpio_status_offset = 4,
	.adc_mux = AXP20X_MUX_ADC,
	};

	static const struct axp20x_pctrl_desc axp813_data = {
	.pins = axp813_pins,
	.npins = ARRAY_SIZE(axp813_pins),
	.ldo_mask = BIT(0) \| BIT(1),
	.adc_mask = BIT(0),
	.gpio_status_offset = 0,
	.adc_mux = AXP813_MUX_ADC,
	};

	static int axp20x_gpio_get_reg(unsigned int offset)
	{
	switch (offset) {
	case 0:
	return AXP20X_GPIO0_CTRL;
	case 1:
	return AXP20X_GPIO1_CTRL;
	case 2:
	return AXP20X_GPIO2_CTRL;
	}

	return -EINVAL;
	}

	static int axp20x_gpio_input(struct gpio_chip *chip, unsigned int offset)
	{
	return pinctrl_gpio_direction_input(chip->base + offset);
	}

	static int axp20x_gpio_get(struct gpio_chip *chip, unsigned int offset)
	{
	struct axp20x_pctl *pctl = gpiochip_get_data(chip);
	unsigned int val;
	int ret;

	ret = regmap_read(pctl->regmap, AXP20X_GPIO20_SS, &val);
	if (ret)
	return ret;

	return !!(val & BIT(offset + pctl->desc->gpio_status_offset));
	}

	static int axp20x_gpio_get_direction(struct gpio_chip *chip,
	unsigned int offset)
	{
	struct axp20x_pctl *pctl = gpiochip_get_data(chip);
	unsigned int val;
	int reg, ret;

	reg = axp20x_gpio_get_reg(offset);
	if (reg < 0)
	return reg;

	ret = regmap_read(pctl->regmap, reg, &val);
	if (ret)
	return ret;

	/*
	* This shouldn't really happen if the pin is in use already,
	* or if it's not in use yet, it doesn't matter since we're
	* going to change the value soon anyway. Default to output.
	*/
	if ((val & AXP20X_GPIO_FUNCTIONS) > 2)
	return 0;

	/*
	* The GPIO directions are the three lowest values.
	* 2 is input, 0 and 1 are output
	*/
	return val & 2;
	}

	static int axp20x_gpio_output(struct gpio_chip *chip, unsigned int offset,
	int value)
	{
	chip->set(chip, offset, value);

	return 0;
	}

	static void axp20x_gpio_set(struct gpio_chip *chip, unsigned int offset,
	int value)
	{
	struct axp20x_pctl *pctl = gpiochip_get_data(chip);
	int reg;

	reg = axp20x_gpio_get_reg(offset);
	if (reg < 0)
	return;

	regmap_update_bits(pctl->regmap, reg,
	AXP20X_GPIO_FUNCTIONS,
	value ? AXP20X_GPIO_FUNCTION_OUT_HIGH :
	AXP20X_GPIO_FUNCTION_OUT_LOW);
	}

	static int axp20x_pmx_set(struct pinctrl_dev *pctldev, unsigned int offset,
	u8 config)
	{
	struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);
	int reg;

	reg = axp20x_gpio_get_reg(offset);
	if (reg < 0)
	return reg;

	return regmap_update_bits(pctl->regmap, reg, AXP20X_GPIO_FUNCTIONS,
	config);
	}

	static int axp20x_pmx_func_cnt(struct pinctrl_dev *pctldev)
	{
	struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);

	return ARRAY_SIZE(pctl->funcs);
	}

	static const char axp20x_pmx_func_name(struct pinctrl_dev pctldev,
	unsigned int selector)
	{
	struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);

	return pctl->funcs[selector].name;
	}

	static int axp20x_pmx_func_groups(struct pinctrl_dev *pctldev,
	unsigned int selector,
	const char * const **groups,
	unsigned int *num_groups)
	{
	struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);

	*groups = pctl->funcs[selector].groups;
	*num_groups = pctl->funcs[selector].ngroups;

	return 0;
	}

	static int axp20x_pmx_set_mux(struct pinctrl_dev *pctldev,
	unsigned int function, unsigned int group)
	{
	struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);
	unsigned int mask;

	/* Every pin supports GPIO_OUT and GPIO_IN functions */
	if (function <= AXP20X_FUNC_GPIO_IN)
	return axp20x_pmx_set(pctldev, group,
	pctl->funcs[function].muxval);

	if (function == AXP20X_FUNC_LDO)
	mask = pctl->desc->ldo_mask;
	else
	mask = pctl->desc->adc_mask;

	if (!(BIT(group) & mask))
	return -EINVAL;

	/*
	* We let the regulator framework handle the LDO muxing as muxing bits
	* are basically also regulators on/off bits. It's better not to enforce
	* any state of the regulator when selecting LDO mux so that we don't
	* interfere with the regulator driver.
	*/
	if (function == AXP20X_FUNC_LDO)
	return 0;

	return axp20x_pmx_set(pctldev, group, pctl->funcs[function].muxval);
	}

	static int axp20x_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
	struct pinctrl_gpio_range *range,
	unsigned int offset, bool input)
	{
	struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);

	if (input)
	return axp20x_pmx_set(pctldev, offset,
	pctl->funcs[AXP20X_FUNC_GPIO_IN].muxval);

	return axp20x_pmx_set(pctldev, offset,
	pctl->funcs[AXP20X_FUNC_GPIO_OUT].muxval);
	}

	static const struct pinmux_ops axp20x_pmx_ops = {
	.get_functions_count = axp20x_pmx_func_cnt,
	.get_function_name = axp20x_pmx_func_name,
	.get_function_groups = axp20x_pmx_func_groups,
	.set_mux = axp20x_pmx_set_mux,
	.gpio_set_direction = axp20x_pmx_gpio_set_direction,
	.strict = true,
	};

	static int axp20x_groups_cnt(struct pinctrl_dev *pctldev)
	{
	struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);

	return pctl->desc->npins;
	}

	static int axp20x_group_pins(struct pinctrl_dev *pctldev, unsigned int selector,
	const unsigned int *pins, unsigned int num_pins)
	{
	struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);

	pins = (unsigned int )&pctl->desc->pins[selector];
	*num_pins = 1;

	return 0;
	}

	static const char axp20x_group_name(struct pinctrl_dev pctldev,
	unsigned int selector)
	{
	struct axp20x_pctl *pctl = pinctrl_dev_get_drvdata(pctldev);

	return pctl->desc->pins[selector].name;
	}

	static const struct pinctrl_ops axp20x_pctrl_ops = {
	.dt_node_to_map = pinconf_generic_dt_node_to_map_group,
	.dt_free_map = pinconf_generic_dt_free_map,
	.get_groups_count = axp20x_groups_cnt,
	.get_group_name = axp20x_group_name,
	.get_group_pins = axp20x_group_pins,
	};

	static int axp20x_funcs_groups_from_mask(struct device *dev, unsigned int mask,
	unsigned int mask_len,
	struct axp20x_pinctrl_function *func,
	const struct pinctrl_pin_desc *pins)
	{
	unsigned long int mask_cpy = mask;
	const char **group;
	unsigned int ngroups = hweight8(mask);
	int bit;

	func->ngroups = ngroups;
	if (func->ngroups > 0) {
	func->groups = devm_kcalloc(dev,
	ngroups, sizeof(const char *),
	GFP_KERNEL);
	if (!func->groups)
	return -ENOMEM;
	group = func->groups;
	for_each_set_bit(bit, &mask_cpy, mask_len) {
	*group = pins[bit].name;
	group++;
	}
	}

	return 0;
	}

	static int axp20x_build_funcs_groups(struct platform_device *pdev)
	{
	struct axp20x_pctl *pctl = platform_get_drvdata(pdev);
	int i, ret, pin, npins = pctl->desc->npins;

	pctl->funcs[AXP20X_FUNC_GPIO_OUT].name = "gpio_out";
	pctl->funcs[AXP20X_FUNC_GPIO_OUT].muxval = AXP20X_MUX_GPIO_OUT;
	pctl->funcs[AXP20X_FUNC_GPIO_IN].name = "gpio_in";
	pctl->funcs[AXP20X_FUNC_GPIO_IN].muxval = AXP20X_MUX_GPIO_IN;
	pctl->funcs[AXP20X_FUNC_LDO].name = "ldo";
	/*
	* Muxval for LDO is useless as we won't use it.
	* See comment in axp20x_pmx_set_mux.
	*/
	pctl->funcs[AXP20X_FUNC_ADC].name = "adc";
	pctl->funcs[AXP20X_FUNC_ADC].muxval = pctl->desc->adc_mux;

	/* Every pin supports GPIO_OUT and GPIO_IN functions */
	for (i = 0; i <= AXP20X_FUNC_GPIO_IN; i++) {
	pctl->funcs[i].ngroups = npins;
	pctl->funcs[i].groups = devm_kcalloc(&pdev->dev,
	npins, sizeof(char *),
	GFP_KERNEL);
	if (!pctl->funcs[i].groups)
	return -ENOMEM;
	for (pin = 0; pin < npins; pin++)
	pctl->funcs[i].groups[pin] = pctl->desc->pins[pin].name;
	}

	ret = axp20x_funcs_groups_from_mask(&pdev->dev, pctl->desc->ldo_mask,
	npins, &pctl->funcs[AXP20X_FUNC_LDO],
	pctl->desc->pins);
	if (ret)
	return ret;

	ret = axp20x_funcs_groups_from_mask(&pdev->dev, pctl->desc->adc_mask,
	npins, &pctl->funcs[AXP20X_FUNC_ADC],
	pctl->desc->pins);
	if (ret)
	return ret;

	return 0;
	}

	static const struct of_device_id axp20x_pctl_match[] = {
	{ .compatible = "x-powers,axp209-gpio", .data = &axp20x_data, },
	{ .compatible = "x-powers,axp813-gpio", .data = &axp813_data, },
	{ }
	};
	MODULE_DEVICE_TABLE(of, axp20x_pctl_match);

	static int axp20x_pctl_probe(struct platform_device *pdev)
	{
	struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
	struct axp20x_pctl *pctl;
	struct device *dev = &pdev->dev;
	struct pinctrl_desc *pctrl_desc;
	int ret;

	if (!of_device_is_available(pdev->dev.of_node))
	return -ENODEV;

	if (!axp20x) {
	dev_err(&pdev->dev, "Parent drvdata not set\n");
	return -EINVAL;
	}

	pctl = devm_kzalloc(&pdev->dev, sizeof(*pctl), GFP_KERNEL);
	if (!pctl)
	return -ENOMEM;

	pctl->chip.base = -1;
	pctl->chip.can_sleep = true;
	pctl->chip.request = gpiochip_generic_request;
	pctl->chip.free = gpiochip_generic_free;
	pctl->chip.parent = &pdev->dev;
	pctl->chip.label = dev_name(&pdev->dev);
	pctl->chip.owner = THIS_MODULE;
	pctl->chip.get = axp20x_gpio_get;
	pctl->chip.get_direction = axp20x_gpio_get_direction;
	pctl->chip.set = axp20x_gpio_set;
	pctl->chip.direction_input = axp20x_gpio_input;
	pctl->chip.direction_output = axp20x_gpio_output;

	pctl->desc = of_device_get_match_data(dev);

	pctl->chip.ngpio = pctl->desc->npins;

	pctl->regmap = axp20x->regmap;
	pctl->dev = &pdev->dev;

	platform_set_drvdata(pdev, pctl);

	ret = axp20x_build_funcs_groups(pdev);
	if (ret) {
	dev_err(&pdev->dev, "failed to build groups\n");
	return ret;
	}

	pctrl_desc = devm_kzalloc(&pdev->dev, sizeof(*pctrl_desc), GFP_KERNEL);
	if (!pctrl_desc)
	return -ENOMEM;

	pctrl_desc->name = dev_name(&pdev->dev);
	pctrl_desc->owner = THIS_MODULE;
	pctrl_desc->pins = pctl->desc->pins;
	pctrl_desc->npins = pctl->desc->npins;
	pctrl_desc->pctlops = &axp20x_pctrl_ops;
	pctrl_desc->pmxops = &axp20x_pmx_ops;

	pctl->pctl_dev = devm_pinctrl_register(&pdev->dev, pctrl_desc, pctl);
	if (IS_ERR(pctl->pctl_dev)) {
	dev_err(&pdev->dev, "couldn't register pinctrl driver\n");
	return PTR_ERR(pctl->pctl_dev);
	}

	ret = devm_gpiochip_add_data(&pdev->dev, &pctl->chip, pctl);
	if (ret) {
	dev_err(&pdev->dev, "Failed to register GPIO chip\n");
	return ret;
	}

	ret = gpiochip_add_pin_range(&pctl->chip, dev_name(&pdev->dev),
	pctl->desc->pins->number,
	pctl->desc->pins->number,
	pctl->desc->npins);
	if (ret) {
	dev_err(&pdev->dev, "failed to add pin range\n");
	return ret;
	}

	dev_info(&pdev->dev, "AXP209 pinctrl and GPIO driver loaded\n");

	return 0;
	}

	static struct platform_driver axp20x_pctl_driver = {
	.probe = axp20x_pctl_probe,
	.driver = {
	.name = "axp20x-gpio",
	.of_match_table = axp20x_pctl_match,
	},
	};

	module_platform_driver(axp20x_pctl_driver);

	MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
	MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
	MODULE_DESCRIPTION("AXP20x PMIC pinctrl and GPIO driver");
	MODULE_LICENSE("GPL");