linux-arkmicro/linux/drivers/pinctrl/cirrus/pinctrl-madera-core.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Pinctrl for Cirrus Logic Madera codecs
 *
 * Copyright (C) 2016-2018 Cirrus Logic
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by the
 * Free Software Foundation; version 2.
 */

#include <linux/err.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/pinconf-generic.h>

#include <linux/mfd/madera/core.h>
#include <linux/mfd/madera/registers.h>

#include "../pinctrl-utils.h"

#include "pinctrl-madera.h"

/*
 * Use pin GPIO names for consistency
 * NOTE: IDs are zero-indexed for coding convenience
 */
static const struct pinctrl_pin_desc madera_pins[] = {
	PINCTRL_PIN(0, "gpio1"),
	PINCTRL_PIN(1, "gpio2"),
	PINCTRL_PIN(2, "gpio3"),
	PINCTRL_PIN(3, "gpio4"),
	PINCTRL_PIN(4, "gpio5"),
	PINCTRL_PIN(5, "gpio6"),
	PINCTRL_PIN(6, "gpio7"),
	PINCTRL_PIN(7, "gpio8"),
	PINCTRL_PIN(8, "gpio9"),
	PINCTRL_PIN(9, "gpio10"),
	PINCTRL_PIN(10, "gpio11"),
	PINCTRL_PIN(11, "gpio12"),
	PINCTRL_PIN(12, "gpio13"),
	PINCTRL_PIN(13, "gpio14"),
	PINCTRL_PIN(14, "gpio15"),
	PINCTRL_PIN(15, "gpio16"),
	PINCTRL_PIN(16, "gpio17"),
	PINCTRL_PIN(17, "gpio18"),
	PINCTRL_PIN(18, "gpio19"),
	PINCTRL_PIN(19, "gpio20"),
	PINCTRL_PIN(20, "gpio21"),
	PINCTRL_PIN(21, "gpio22"),
	PINCTRL_PIN(22, "gpio23"),
	PINCTRL_PIN(23, "gpio24"),
	PINCTRL_PIN(24, "gpio25"),
	PINCTRL_PIN(25, "gpio26"),
	PINCTRL_PIN(26, "gpio27"),
	PINCTRL_PIN(27, "gpio28"),
	PINCTRL_PIN(28, "gpio29"),
	PINCTRL_PIN(29, "gpio30"),
	PINCTRL_PIN(30, "gpio31"),
	PINCTRL_PIN(31, "gpio32"),
	PINCTRL_PIN(32, "gpio33"),
	PINCTRL_PIN(33, "gpio34"),
	PINCTRL_PIN(34, "gpio35"),
	PINCTRL_PIN(35, "gpio36"),
	PINCTRL_PIN(36, "gpio37"),
	PINCTRL_PIN(37, "gpio38"),
	PINCTRL_PIN(38, "gpio39"),
	PINCTRL_PIN(39, "gpio40"),
};

/*
 * All single-pin functions can be mapped to any GPIO, however pinmux applies
 * functions to pin groups and only those groups declared as supporting that
 * function. To make this work we must put each pin in its own dummy group so
 * that the functions can be described as applying to all pins.
 * Since these do not correspond to anything in the actual hardware - they are
 * merely an adaptation to pinctrl's view of the world - we use the same name
 * as the pin to avoid confusion when comparing with datasheet instructions
 */
static const char * const madera_pin_single_group_names[] = {
	"gpio1",  "gpio2",  "gpio3",  "gpio4",  "gpio5",  "gpio6",  "gpio7",
	"gpio8",  "gpio9",  "gpio10", "gpio11", "gpio12", "gpio13", "gpio14",
	"gpio15", "gpio16", "gpio17", "gpio18", "gpio19", "gpio20", "gpio21",
	"gpio22", "gpio23", "gpio24", "gpio25", "gpio26", "gpio27", "gpio28",
	"gpio29", "gpio30", "gpio31", "gpio32", "gpio33", "gpio34", "gpio35",
	"gpio36", "gpio37", "gpio38", "gpio39", "gpio40",
};

/* set of pin numbers for single-pin groups, zero-indexed */
static const unsigned int madera_pin_single_group_pins[] = {
	  0,  1,  2,  3,  4,  5,  6,
	  7,  8,  9, 10, 11, 12, 13,
	 14, 15, 16, 17, 18, 19, 20,
	 21, 22, 23, 24, 25, 26, 27,
	 28, 29, 30, 31, 32, 33, 34,
	 35, 36, 37, 38, 39,
};

static const char * const madera_aif1_group_names[] = { "aif1" };
static const char * const madera_aif2_group_names[] = { "aif2" };
static const char * const madera_aif3_group_names[] = { "aif3" };
static const char * const madera_aif4_group_names[] = { "aif4" };
static const char * const madera_mif1_group_names[] = { "mif1" };
static const char * const madera_mif2_group_names[] = { "mif2" };
static const char * const madera_mif3_group_names[] = { "mif3" };
static const char * const madera_dmic3_group_names[] = { "dmic3" };
static const char * const madera_dmic4_group_names[] = { "dmic4" };
static const char * const madera_dmic5_group_names[] = { "dmic5" };
static const char * const madera_dmic6_group_names[] = { "dmic6" };
static const char * const madera_spk1_group_names[] = { "pdmspk1" };
static const char * const madera_spk2_group_names[] = { "pdmspk2" };

/*
 * alt-functions always apply to a single pin group, other functions always
 * apply to all pins
 */
static const struct {
	const char *name;
	const char * const *group_names;
	u32 func;
} madera_mux_funcs[] = {
	{
		.name = "aif1",
		.group_names = madera_aif1_group_names,
		.func = 0x000
	},
	{
		.name = "aif2",
		.group_names = madera_aif2_group_names,
		.func = 0x000
	},
	{
		.name = "aif3",
		.group_names = madera_aif3_group_names,
		.func = 0x000
	},
	{
		.name = "aif4",
		.group_names = madera_aif4_group_names,
		.func = 0x000
	},
	{
		.name = "mif1",
		.group_names = madera_mif1_group_names,
		.func = 0x000
	},
	{
		.name = "mif2",
		.group_names = madera_mif2_group_names,
		.func = 0x000
	},
	{
		.name = "mif3",
		.group_names = madera_mif3_group_names,
		.func = 0x000
	},
	{
		.name = "dmic3",
		.group_names = madera_dmic3_group_names,
		.func = 0x000
	},
	{
		.name = "dmic4",
		.group_names = madera_dmic4_group_names,
		.func = 0x000
	},
	{
		.name = "dmic5",
		.group_names = madera_dmic5_group_names,
		.func = 0x000
	},
	{
		.name = "dmic6",
		.group_names = madera_dmic6_group_names,
		.func = 0x000
	},
	{
		.name = "pdmspk1",
		.group_names = madera_spk1_group_names,
		.func = 0x000
	},
	{
		.name = "pdmspk2",
		.group_names = madera_spk2_group_names,
		.func = 0x000
	},
	{
		.name = "io",
		.group_names = madera_pin_single_group_names,
		.func = 0x001
	},
	{
		.name = "dsp-gpio",
		.group_names = madera_pin_single_group_names,
		.func = 0x002
	},
	{
		.name = "irq1",
		.group_names = madera_pin_single_group_names,
		.func = 0x003
	},
	{
		.name = "irq2",
		.group_names = madera_pin_single_group_names,
		.func = 0x004
	},
	{
		.name = "fll1-clk",
		.group_names = madera_pin_single_group_names,
		.func = 0x010
	},
	{
		.name = "fll2-clk",
		.group_names = madera_pin_single_group_names,
		.func = 0x011
	},
	{
		.name = "fll3-clk",
		.group_names = madera_pin_single_group_names,
		.func = 0x012
	},
	{
		.name = "fllao-clk",
		.group_names = madera_pin_single_group_names,
		.func = 0x013
	},
	{
		.name = "fll1-lock",
		.group_names = madera_pin_single_group_names,
		.func = 0x018
	},
	{
		.name = "fll2-lock",
		.group_names = madera_pin_single_group_names,
		.func = 0x019
	},
	{
		.name = "fll3-lock",
		.group_names = madera_pin_single_group_names,
		.func = 0x01a
	},
	{
		.name = "fllao-lock",
		.group_names = madera_pin_single_group_names,
		.func = 0x01b
	},
	{
		.name = "opclk",
		.group_names = madera_pin_single_group_names,
		.func = 0x040
	},
	{
		.name = "opclk-async",
		.group_names = madera_pin_single_group_names,
		.func = 0x041
	},
	{
		.name = "pwm1",
		.group_names = madera_pin_single_group_names,
		.func = 0x048
	},
	{
		.name = "pwm2",
		.group_names = madera_pin_single_group_names,
		.func = 0x049
	},
	{
		.name = "spdif",
		.group_names = madera_pin_single_group_names,
		.func = 0x04c
	},
	{
		.name = "asrc1-in1-lock",
		.group_names = madera_pin_single_group_names,
		.func = 0x088
	},
	{
		.name = "asrc1-in2-lock",
		.group_names = madera_pin_single_group_names,
		.func = 0x089
	},
	{
		.name = "asrc2-in1-lock",
		.group_names = madera_pin_single_group_names,
		.func = 0x08a
	},
	{
		.name = "asrc2-in2-lock",
		.group_names = madera_pin_single_group_names,
		.func = 0x08b
	},
	{
		.name = "spkl-short-circuit",
		.group_names = madera_pin_single_group_names,
		.func = 0x0b6
	},
	{
		.name = "spkr-short-circuit",
		.group_names = madera_pin_single_group_names,
		.func = 0x0b7
	},
	{
		.name = "spk-shutdown",
		.group_names = madera_pin_single_group_names,
		.func = 0x0e0
	},
	{
		.name = "spk-overheat-shutdown",
		.group_names = madera_pin_single_group_names,
		.func = 0x0e1
	},
	{
		.name = "spk-overheat-warn",
		.group_names = madera_pin_single_group_names,
		.func = 0x0e2
	},
	{
		.name = "timer1-sts",
		.group_names = madera_pin_single_group_names,
		.func = 0x140
	},
	{
		.name = "timer2-sts",
		.group_names = madera_pin_single_group_names,
		.func = 0x141
	},
	{
		.name = "timer3-sts",
		.group_names = madera_pin_single_group_names,
		.func = 0x142
	},
	{
		.name = "timer4-sts",
		.group_names = madera_pin_single_group_names,
		.func = 0x143
	},
	{
		.name = "timer5-sts",
		.group_names = madera_pin_single_group_names,
		.func = 0x144
	},
	{
		.name = "timer6-sts",
		.group_names = madera_pin_single_group_names,
		.func = 0x145
	},
	{
		.name = "timer7-sts",
		.group_names = madera_pin_single_group_names,
		.func = 0x146
	},
	{
		.name = "timer8-sts",
		.group_names = madera_pin_single_group_names,
		.func = 0x147
	},
	{
		.name = "log1-fifo-ne",
		.group_names = madera_pin_single_group_names,
		.func = 0x150
	},
	{
		.name = "log2-fifo-ne",
		.group_names = madera_pin_single_group_names,
		.func = 0x151
	},
	{
		.name = "log3-fifo-ne",
		.group_names = madera_pin_single_group_names,
		.func = 0x152
	},
	{
		.name = "log4-fifo-ne",
		.group_names = madera_pin_single_group_names,
		.func = 0x153
	},
	{
		.name = "log5-fifo-ne",
		.group_names = madera_pin_single_group_names,
		.func = 0x154
	},
	{
		.name = "log6-fifo-ne",
		.group_names = madera_pin_single_group_names,
		.func = 0x155
	},
	{
		.name = "log7-fifo-ne",
		.group_names = madera_pin_single_group_names,
		.func = 0x156
	},
	{
		.name = "log8-fifo-ne",
		.group_names = madera_pin_single_group_names,
		.func = 0x157
	},
};

static u16 madera_pin_make_drv_str(struct madera_pin_private *priv,
				      unsigned int milliamps)
{
	switch (milliamps) {
	case 4:
		return 0;
	case 8:
		return 2 << MADERA_GP1_DRV_STR_SHIFT;
	default:
		break;
	}

	dev_warn(priv->dev, "%u mA not a valid drive strength", milliamps);

	return 0;
}

static unsigned int madera_pin_unmake_drv_str(struct madera_pin_private *priv,
					      u16 regval)
{
	regval = (regval & MADERA_GP1_DRV_STR_MASK) >> MADERA_GP1_DRV_STR_SHIFT;

	switch (regval) {
	case 0:
		return 4;
	case 2:
		return 8;
	default:
		return 0;
	}
}

static int madera_get_groups_count(struct pinctrl_dev *pctldev)
{
	struct madera_pin_private *priv = pinctrl_dev_get_drvdata(pctldev);

	/* Number of alt function groups plus number of single-pin groups */
	return priv->chip->n_pin_groups + priv->chip->n_pins;
}

static const char *madera_get_group_name(struct pinctrl_dev *pctldev,
					 unsigned int selector)
{
	struct madera_pin_private *priv = pinctrl_dev_get_drvdata(pctldev);

	if (selector < priv->chip->n_pin_groups)
		return priv->chip->pin_groups[selector].name;

	selector -= priv->chip->n_pin_groups;
	return madera_pin_single_group_names[selector];
}

static int madera_get_group_pins(struct pinctrl_dev *pctldev,
				 unsigned int selector,
				 const unsigned int **pins,
				 unsigned int *num_pins)
{
	struct madera_pin_private *priv = pinctrl_dev_get_drvdata(pctldev);

	if (selector < priv->chip->n_pin_groups) {
		*pins = priv->chip->pin_groups[selector].pins;
		*num_pins = priv->chip->pin_groups[selector].n_pins;
	} else {
		/* return the dummy group for a single pin */
		selector -= priv->chip->n_pin_groups;
		*pins = &madera_pin_single_group_pins[selector];
		*num_pins = 1;
	}
	return 0;
}

static void madera_pin_dbg_show_fn(struct madera_pin_private *priv,
				   struct seq_file *s,
				   unsigned int pin, unsigned int fn)
{
	const struct madera_pin_chip *chip = priv->chip;
	int i, g_pin;

	if (fn != 0) {
		for (i = 0; i < ARRAY_SIZE(madera_mux_funcs); ++i) {
			if (madera_mux_funcs[i].func == fn) {
				seq_printf(s, " FN=%s",
					   madera_mux_funcs[i].name);
				return;
			}
		}
		return;	/* ignore unknown function values */
	}

	/* alt function */
	for (i = 0; i < chip->n_pin_groups; ++i) {
		for (g_pin = 0; g_pin < chip->pin_groups[i].n_pins; ++g_pin) {
			if (chip->pin_groups[i].pins[g_pin] == pin) {
				seq_printf(s, " FN=%s",
					   chip->pin_groups[i].name);
				return;
			}
		}
	}
}

static void __maybe_unused madera_pin_dbg_show(struct pinctrl_dev *pctldev,
					       struct seq_file *s,
					       unsigned int pin)
{
	struct madera_pin_private *priv = pinctrl_dev_get_drvdata(pctldev);
	unsigned int conf[2];
	unsigned int reg = MADERA_GPIO1_CTRL_1 + (2 * pin);
	unsigned int fn;
	int ret;

	ret = regmap_read(priv->madera->regmap, reg, &conf[0]);
	if (ret)
		return;

	ret = regmap_read(priv->madera->regmap, reg + 1, &conf[1]);
	if (ret)
		return;

	seq_printf(s, "%04x:%04x", conf[0], conf[1]);

	fn = (conf[0] & MADERA_GP1_FN_MASK) >> MADERA_GP1_FN_SHIFT;
	madera_pin_dbg_show_fn(priv, s, pin, fn);

	/* State of direction bit is only relevant if function==1 */
	if (fn == 1) {
		if (conf[1] & MADERA_GP1_DIR_MASK)
			seq_puts(s, " IN");
		else
			seq_puts(s, " OUT");
	}

	if (conf[1] & MADERA_GP1_PU_MASK)
		seq_puts(s, " PU");

	if (conf[1] & MADERA_GP1_PD_MASK)
		seq_puts(s, " PD");

	if (conf[0] & MADERA_GP1_DB_MASK)
		seq_puts(s, " DB");

	if (conf[0] & MADERA_GP1_OP_CFG_MASK)
		seq_puts(s, " OD");
	else
		seq_puts(s, " CMOS");

	seq_printf(s, " DRV=%umA", madera_pin_unmake_drv_str(priv, conf[1]));

	if (conf[0] & MADERA_GP1_IP_CFG_MASK)
		seq_puts(s, "SCHMITT");
}


static const struct pinctrl_ops madera_pin_group_ops = {
	.get_groups_count = madera_get_groups_count,
	.get_group_name = madera_get_group_name,
	.get_group_pins = madera_get_group_pins,
#if IS_ENABLED(CONFIG_OF)
	.dt_node_to_map = pinconf_generic_dt_node_to_map_all,
	.dt_free_map = pinctrl_utils_free_map,
#endif
#if IS_ENABLED(CONFIG_DEBUG_FS)
	.pin_dbg_show = madera_pin_dbg_show,
#endif
};

static int madera_mux_get_funcs_count(struct pinctrl_dev *pctldev)
{
	return ARRAY_SIZE(madera_mux_funcs);
}

static const char *madera_mux_get_func_name(struct pinctrl_dev *pctldev,
					    unsigned int selector)
{
	return madera_mux_funcs[selector].name;
}

static int madera_mux_get_groups(struct pinctrl_dev *pctldev,
				 unsigned int selector,
				 const char * const **groups,
				 unsigned int * const num_groups)
{
	struct madera_pin_private *priv = pinctrl_dev_get_drvdata(pctldev);

	*groups = madera_mux_funcs[selector].group_names;

	if (madera_mux_funcs[selector].func == 0) {
		/* alt func always maps to a single group */
		*num_groups = 1;
	} else {
		/* other funcs map to all available gpio pins */
		*num_groups = priv->chip->n_pins;
	}

	return 0;
}

static int madera_mux_set_mux(struct pinctrl_dev *pctldev,
			      unsigned int selector,
			      unsigned int group)
{
	struct madera_pin_private *priv = pinctrl_dev_get_drvdata(pctldev);
	struct madera *madera = priv->madera;
	const struct madera_pin_groups *pin_group = priv->chip->pin_groups;
	unsigned int n_chip_groups = priv->chip->n_pin_groups;
	const char *func_name = madera_mux_funcs[selector].name;
	unsigned int reg;
	int i, ret = 0;

	dev_dbg(priv->dev, "%s selecting %u (%s) for group %u (%s)\n",
		__func__, selector, func_name, group,
		madera_get_group_name(pctldev, group));

	if (madera_mux_funcs[selector].func == 0) {
		/* alt func pin assignments are codec-specific */
		for (i = 0; i < n_chip_groups; ++i) {
			if (strcmp(func_name, pin_group->name) == 0)
				break;

			++pin_group;
		}

		if (i == n_chip_groups)
			return -EINVAL;

		for (i = 0; i < pin_group->n_pins; ++i) {
			reg = MADERA_GPIO1_CTRL_1 + (2 * pin_group->pins[i]);

			dev_dbg(priv->dev, "%s setting 0x%x func bits to 0\n",
				__func__, reg);

			ret = regmap_update_bits(madera->regmap, reg,
						 MADERA_GP1_FN_MASK, 0);
			if (ret)
				break;

		}
	} else {
		/*
		 * for other funcs the group will be the gpio number and will
		 * be offset by the number of chip-specific functions at the
		 * start of the group list
		 */
		group -= n_chip_groups;
		reg = MADERA_GPIO1_CTRL_1 + (2 * group);

		dev_dbg(priv->dev, "%s setting 0x%x func bits to 0x%x\n",
			__func__, reg, madera_mux_funcs[selector].func);

		ret = regmap_update_bits(madera->regmap,
					 reg,
					 MADERA_GP1_FN_MASK,
					 madera_mux_funcs[selector].func);
	}

	if (ret)
		dev_err(priv->dev, "Failed to write to 0x%x (%d)\n", reg, ret);

	return ret;
}

static int madera_gpio_set_direction(struct pinctrl_dev *pctldev,
				     struct pinctrl_gpio_range *range,
				     unsigned int offset,
				     bool input)
{
	struct madera_pin_private *priv = pinctrl_dev_get_drvdata(pctldev);
	struct madera *madera = priv->madera;
	unsigned int reg = MADERA_GPIO1_CTRL_2 + (2 * offset);
	unsigned int val;
	int ret;

	if (input)
		val = MADERA_GP1_DIR;
	else
		val = 0;

	ret = regmap_update_bits(madera->regmap, reg, MADERA_GP1_DIR_MASK, val);
	if (ret)
		dev_err(priv->dev, "Failed to write to 0x%x (%d)\n", reg, ret);

	return ret;
}

static int madera_gpio_request_enable(struct pinctrl_dev *pctldev,
				      struct pinctrl_gpio_range *range,
				      unsigned int offset)
{
	struct madera_pin_private *priv = pinctrl_dev_get_drvdata(pctldev);
	struct madera *madera = priv->madera;
	unsigned int reg = MADERA_GPIO1_CTRL_1 + (2 * offset);
	int ret;

	/* put the pin into GPIO mode */
	ret = regmap_update_bits(madera->regmap, reg, MADERA_GP1_FN_MASK, 1);
	if (ret)
		dev_err(priv->dev, "Failed to write to 0x%x (%d)\n", reg, ret);

	return ret;
}

static void madera_gpio_disable_free(struct pinctrl_dev *pctldev,
				     struct pinctrl_gpio_range *range,
				     unsigned int offset)
{
	struct madera_pin_private *priv = pinctrl_dev_get_drvdata(pctldev);
	struct madera *madera = priv->madera;
	unsigned int reg = MADERA_GPIO1_CTRL_1 + (2 * offset);
	int ret;

	/* disable GPIO by setting to GPIO IN */
	madera_gpio_set_direction(pctldev, range, offset, true);

	ret = regmap_update_bits(madera->regmap, reg, MADERA_GP1_FN_MASK, 1);
	if (ret)
		dev_err(priv->dev, "Failed to write to 0x%x (%d)\n", reg, ret);
}

static const struct pinmux_ops madera_pin_mux_ops = {
	.get_functions_count = madera_mux_get_funcs_count,
	.get_function_name = madera_mux_get_func_name,
	.get_function_groups = madera_mux_get_groups,
	.set_mux = madera_mux_set_mux,
	.gpio_request_enable = madera_gpio_request_enable,
	.gpio_disable_free = madera_gpio_disable_free,
	.gpio_set_direction = madera_gpio_set_direction,
	.strict = true, /* GPIO and other functions are exclusive */
};

static int madera_pin_conf_get(struct pinctrl_dev *pctldev, unsigned int pin,
			       unsigned long *config)
{
	struct madera_pin_private *priv = pinctrl_dev_get_drvdata(pctldev);
	unsigned int param = pinconf_to_config_param(*config);
	unsigned int result = 0;
	unsigned int reg = MADERA_GPIO1_CTRL_1 + (2 * pin);
	unsigned int conf[2];
	int ret;

	ret = regmap_read(priv->madera->regmap, reg, &conf[0]);
	if (!ret)
		ret = regmap_read(priv->madera->regmap, reg + 1, &conf[1]);

	if (ret) {
		dev_err(priv->dev, "Failed to read GP%d conf (%d)\n",
			pin + 1, ret);
		return ret;
	}

	switch (param) {
	case PIN_CONFIG_BIAS_BUS_HOLD:
		conf[1] &= MADERA_GP1_PU_MASK | MADERA_GP1_PD_MASK;
		if (conf[1] == (MADERA_GP1_PU | MADERA_GP1_PD))
			result = 1;
		break;
	case PIN_CONFIG_BIAS_DISABLE:
		conf[1] &= MADERA_GP1_PU_MASK | MADERA_GP1_PD_MASK;
		if (!conf[1])
			result = 1;
		break;
	case PIN_CONFIG_BIAS_PULL_DOWN:
		conf[1] &= MADERA_GP1_PU_MASK | MADERA_GP1_PD_MASK;
		if (conf[1] == MADERA_GP1_PD_MASK)
			result = 1;
		break;
	case PIN_CONFIG_BIAS_PULL_UP:
		conf[1] &= MADERA_GP1_PU_MASK | MADERA_GP1_PD_MASK;
		if (conf[1] == MADERA_GP1_PU_MASK)
			result = 1;
		break;
	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
		if (conf[0] & MADERA_GP1_OP_CFG_MASK)
			result = 1;
		break;
	case PIN_CONFIG_DRIVE_PUSH_PULL:
		if (!(conf[0] & MADERA_GP1_OP_CFG_MASK))
			result = 1;
		break;
	case PIN_CONFIG_DRIVE_STRENGTH:
		result = madera_pin_unmake_drv_str(priv, conf[1]);
		break;
	case PIN_CONFIG_INPUT_DEBOUNCE:
		if (conf[0] & MADERA_GP1_DB_MASK)
			result = 1;
		break;
	case PIN_CONFIG_INPUT_ENABLE:
		if (conf[0] & MADERA_GP1_DIR_MASK)
			result = 1;
		break;
	case PIN_CONFIG_INPUT_SCHMITT:
	case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
		if (conf[0] & MADERA_GP1_IP_CFG_MASK)
			result = 1;
		break;
	case PIN_CONFIG_OUTPUT:
		if ((conf[1] & MADERA_GP1_DIR_MASK) &&
		    (conf[0] & MADERA_GP1_LVL_MASK))
			result = 1;
		break;
	default:
		break;
	}

	*config = pinconf_to_config_packed(param, result);

	return 0;
}

static int madera_pin_conf_set(struct pinctrl_dev *pctldev, unsigned int pin,
			       unsigned long *configs, unsigned int num_configs)
{
	struct madera_pin_private *priv = pinctrl_dev_get_drvdata(pctldev);
	u16 conf[2] = {0, 0};
	u16 mask[2] = {0, 0};
	unsigned int reg = MADERA_GPIO1_CTRL_1 + (2 * pin);
	unsigned int val;
	int ret;

	while (num_configs) {
		dev_dbg(priv->dev, "%s config 0x%lx\n", __func__, *configs);

		switch (pinconf_to_config_param(*configs)) {
		case PIN_CONFIG_BIAS_BUS_HOLD:
			mask[1] |= MADERA_GP1_PU_MASK | MADERA_GP1_PD_MASK;
			conf[1] |= MADERA_GP1_PU | MADERA_GP1_PD;
			break;
		case PIN_CONFIG_BIAS_DISABLE:
			mask[1] |= MADERA_GP1_PU_MASK | MADERA_GP1_PD_MASK;
			conf[1] &= ~(MADERA_GP1_PU | MADERA_GP1_PD);
			break;
		case PIN_CONFIG_BIAS_PULL_DOWN:
			mask[1] |= MADERA_GP1_PU_MASK | MADERA_GP1_PD_MASK;
			conf[1] |= MADERA_GP1_PD;
			conf[1] &= ~MADERA_GP1_PU;
			break;
		case PIN_CONFIG_BIAS_PULL_UP:
			mask[1] |= MADERA_GP1_PU_MASK | MADERA_GP1_PD_MASK;
			conf[1] |= MADERA_GP1_PU;
			conf[1] &= ~MADERA_GP1_PD;
			break;
		case PIN_CONFIG_DRIVE_OPEN_DRAIN:
			mask[0] |= MADERA_GP1_OP_CFG_MASK;
			conf[0] |= MADERA_GP1_OP_CFG;
			break;
		case PIN_CONFIG_DRIVE_PUSH_PULL:
			mask[0] |= MADERA_GP1_OP_CFG_MASK;
			conf[0] &= ~MADERA_GP1_OP_CFG;
			break;
		case PIN_CONFIG_DRIVE_STRENGTH:
			val = pinconf_to_config_argument(*configs);
			mask[1] |= MADERA_GP1_DRV_STR_MASK;
			conf[1] &= ~MADERA_GP1_DRV_STR_MASK;
			conf[1] |= madera_pin_make_drv_str(priv, val);
			break;
		case PIN_CONFIG_INPUT_DEBOUNCE:
			mask[0] |= MADERA_GP1_DB_MASK;

			/*
			 * we can't configure debounce time per-pin so value
			 * is just a flag
			 */
			val = pinconf_to_config_argument(*configs);
			if (val)
				conf[0] |= MADERA_GP1_DB;
			else
				conf[0] &= ~MADERA_GP1_DB;
			break;
		case PIN_CONFIG_INPUT_ENABLE:
			val = pinconf_to_config_argument(*configs);
			mask[1] |= MADERA_GP1_DIR_MASK;
			if (val)
				conf[1] |= MADERA_GP1_DIR;
			else
				conf[1] &= ~MADERA_GP1_DIR;
			break;
		case PIN_CONFIG_INPUT_SCHMITT:
			val = pinconf_to_config_argument(*configs);
			mask[0] |= MADERA_GP1_IP_CFG;
			if (val)
				conf[0] |= MADERA_GP1_IP_CFG;
			else
				conf[0] &= ~MADERA_GP1_IP_CFG;

			mask[1] |= MADERA_GP1_DIR_MASK;
			conf[1] |= MADERA_GP1_DIR;
			break;
		case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
			mask[0] |= MADERA_GP1_IP_CFG;
			conf[0] |= MADERA_GP1_IP_CFG;
			mask[1] |= MADERA_GP1_DIR_MASK;
			conf[1] |= MADERA_GP1_DIR;
			break;
		case PIN_CONFIG_OUTPUT:
			val = pinconf_to_config_argument(*configs);
			mask[0] |= MADERA_GP1_LVL_MASK;
			if (val)
				conf[0] |= MADERA_GP1_LVL;
			else
				conf[0] &= ~MADERA_GP1_LVL;

			mask[1] |= MADERA_GP1_DIR_MASK;
			conf[1] &= ~MADERA_GP1_DIR;
			break;
		default:
			break;
		}

		++configs;
		--num_configs;
	}

	dev_dbg(priv->dev,
		"%s gpio%d 0x%x:0x%x 0x%x:0x%x\n",
		__func__, pin + 1, reg, conf[0], reg + 1, conf[1]);

	ret = regmap_update_bits(priv->madera->regmap, reg, mask[0], conf[0]);
	if (ret)
		goto err;

	++reg;
	ret = regmap_update_bits(priv->madera->regmap, reg, mask[1], conf[1]);
	if (ret)
		goto err;

	return 0;

err:
	dev_err(priv->dev,
		"Failed to write GPIO%d conf (%d) reg 0x%x\n",
		pin + 1, ret, reg);

	return ret;
}

static int madera_pin_conf_group_set(struct pinctrl_dev *pctldev,
				     unsigned int selector,
				     unsigned long *configs,
				     unsigned int num_configs)
{
	struct madera_pin_private *priv = pinctrl_dev_get_drvdata(pctldev);
	const struct madera_pin_groups *pin_group;
	unsigned int n_groups = priv->chip->n_pin_groups;
	int i, ret;

	dev_dbg(priv->dev, "%s setting group %s\n", __func__,
		madera_get_group_name(pctldev, selector));

	if (selector >= n_groups) {
		/* group is a single pin, convert to pin number and set */
		return madera_pin_conf_set(pctldev,
					   selector - n_groups,
					   configs,
					   num_configs);
	} else {
		pin_group = &priv->chip->pin_groups[selector];

		for (i = 0; i < pin_group->n_pins; ++i) {
			ret = madera_pin_conf_set(pctldev,
						  pin_group->pins[i],
						  configs,
						  num_configs);
			if (ret)
				return ret;
		}
	}

	return 0;
}

static const struct pinconf_ops madera_pin_conf_ops = {
	.pin_config_get = madera_pin_conf_get,
	.pin_config_set = madera_pin_conf_set,
	.pin_config_group_set = madera_pin_conf_group_set,

};

static struct pinctrl_desc madera_pin_desc = {
	.name = "madera-pinctrl",
	.pins = madera_pins,
	.pctlops = &madera_pin_group_ops,
	.pmxops = &madera_pin_mux_ops,
	.confops = &madera_pin_conf_ops,
	.owner = THIS_MODULE,
};

static int madera_pin_probe(struct platform_device *pdev)
{
	struct madera *madera = dev_get_drvdata(pdev->dev.parent);
	const struct madera_pdata *pdata = dev_get_platdata(madera->dev);
	struct madera_pin_private *priv;
	int ret;

	BUILD_BUG_ON(ARRAY_SIZE(madera_pin_single_group_names) !=
		     ARRAY_SIZE(madera_pin_single_group_pins));

	dev_dbg(&pdev->dev, "%s\n", __func__);

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

	priv->dev = &pdev->dev;
	priv->madera = madera;
	pdev->dev.of_node = madera->dev->of_node;

	switch (madera->type) {
	case CS47L35:
		if (IS_ENABLED(CONFIG_PINCTRL_CS47L35))
			priv->chip = &cs47l35_pin_chip;
		break;
	case CS47L85:
	case WM1840:
		if (IS_ENABLED(CONFIG_PINCTRL_CS47L85))
			priv->chip = &cs47l85_pin_chip;
		break;
	case CS47L90:
	case CS47L91:
		if (IS_ENABLED(CONFIG_PINCTRL_CS47L90))
			priv->chip = &cs47l90_pin_chip;
		break;
	default:
		break;
	}

	if (!priv->chip)
		return -ENODEV;

	madera_pin_desc.npins = priv->chip->n_pins;

	ret = devm_pinctrl_register_and_init(&pdev->dev,
					     &madera_pin_desc,
					     priv,
					     &priv->pctl);
	if (ret) {
		dev_err(priv->dev, "Failed pinctrl register (%d)\n", ret);
		return ret;
	}

	/* if the configuration is provided through pdata, apply it */
	if (pdata && pdata->gpio_configs) {
		ret = pinctrl_register_mappings(pdata->gpio_configs,
						pdata->n_gpio_configs);
		if (ret) {
			dev_err(priv->dev,
				"Failed to register pdata mappings (%d)\n",
				ret);
			return ret;
		}
	}

	ret = pinctrl_enable(priv->pctl);
	if (ret) {
		dev_err(priv->dev, "Failed to enable pinctrl (%d)\n", ret);
		return ret;
	}

	dev_dbg(priv->dev, "pinctrl probed ok\n");

	return 0;
}

static struct platform_driver madera_pin_driver = {
	.probe = madera_pin_probe,
	.driver = {
		.name = "madera-pinctrl",
	},
};

module_platform_driver(madera_pin_driver);

MODULE_DESCRIPTION("Madera pinctrl driver");
MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");
MODULE_LICENSE("GPL v2");