drivers/pinctrl/renesas/pinctrl-rzn1.c - u-boot - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2014-2018 Renesas Electronics Europe Limited
  *
  * Phil Edworthy <phil.edworthy@renesas.com>
  * Based on a driver originally written by Michel Pollet at Renesas.
  */

 #include <dt-bindings/pinctrl/rzn1-pinctrl.h>

 #include <dm/device.h>
 #include <dm/device_compat.h>
 #include <dm/pinctrl.h>
 #include <dm/read.h>
 #include <regmap.h>

 /* Field positions and masks in the pinmux registers */
 #define RZN1_L1_PIN_DRIVE_STRENGTH	10
 #define RZN1_L1_PIN_DRIVE_STRENGTH_4MA	0
 #define RZN1_L1_PIN_DRIVE_STRENGTH_6MA	1
 #define RZN1_L1_PIN_DRIVE_STRENGTH_8MA	2
 #define RZN1_L1_PIN_DRIVE_STRENGTH_12MA	3
 #define RZN1_L1_PIN_PULL		8
 #define RZN1_L1_PIN_PULL_NONE		0
 #define RZN1_L1_PIN_PULL_UP		1
 #define RZN1_L1_PIN_PULL_DOWN		3
 #define RZN1_L1_FUNCTION		0
 #define RZN1_L1_FUNC_MASK		0xf
 #define RZN1_L1_FUNCTION_L2		0xf

 /*
  * The hardware manual describes two levels of multiplexing, but it's more
  * logical to think of the hardware as three levels, with level 3 consisting of
  * the multiplexing for Ethernet MDIO signals.
  *
  * Level 1 functions go from 0 to 9, with level 1 function '15' (0xf) specifying
  * that level 2 functions are used instead. Level 2 has a lot more options,
  * going from 0 to 61. Level 3 allows selection of MDIO functions which can be
  * floating, or one of seven internal peripherals. Unfortunately, there are two
  * level 2 functions that can select MDIO, and two MDIO channels so we have four
  * sets of level 3 functions.
  *
  * For this driver, we've compounded the numbers together, so:
  *    0 to   9 is level 1
  *   10 to  71 is 10 + level 2 number
  *   72 to  79 is 72 + MDIO0 source for level 2 MDIO function.
  *   80 to  87 is 80 + MDIO0 source for level 2 MDIO_E1 function.
  *   88 to  95 is 88 + MDIO1 source for level 2 MDIO function.
  *   96 to 103 is 96 + MDIO1 source for level 2 MDIO_E1 function.
  * Examples:
  *  Function 28 corresponds UART0
  *  Function 73 corresponds to MDIO0 to GMAC0
  *
  * There are 170 configurable pins (called PL_GPIO in the datasheet).
  */

 /*
  * Structure detailing the HW registers on the RZ/N1 devices.
  * Both the Level 1 mux registers and Level 2 mux registers have the same
  * structure. The only difference is that Level 2 has additional MDIO registers
  * at the end.
  */
 struct rzn1_pinctrl_regs {
 	u32	conf[170];
 	u32	pad0[86];
 	u32	status_protect;	/* 0x400 */
 	/* MDIO mux registers, level2 only */
 	u32	l2_mdio[2];
 };

 #define NUM_CONF	ARRAY_SIZE(((struct rzn1_pinctrl_regs *)0)->conf)

 #define level1_write(map, member, val) \
 	regmap_range_set(map, 0, struct rzn1_pinctrl_regs, member, val)

 #define level1_read(map, member, valp) \
 	regmap_range_get(map, 0, struct rzn1_pinctrl_regs, member, valp)

 #define level2_write(map, member, val) \
 	regmap_range_set(map, 1, struct rzn1_pinctrl_regs, member, val)

 #define level2_read(map, member, valp) \
 	regmap_range_get(map, 1, struct rzn1_pinctrl_regs, member, valp)

 /**
  * struct rzn1_pmx_func - describes rzn1 pinmux functions
  * @name: the name of this specific function
  * @groups: corresponding pin groups
  * @num_groups: the number of groups
  */
 struct rzn1_pmx_func {
 	const char *name;
 	const char **groups;
 	unsigned int num_groups;
 };

 /**
  * struct rzn1_pin_group - describes an rzn1 pin group
  * @name: the name of this specific pin group
  * @func: the name of the function selected by this group
  * @npins: the number of pins in this group array, i.e. the number of
  *	elements in .pins so we can iterate over that array
  * @pins: array of pins. Needed due to pinctrl_ops.get_group_pins()
  * @pin_ids: array of pin_ids, i.e. the value used to select the mux
  */
 struct rzn1_pin_group {
 	const char *name;
 	const char *func;
 	unsigned int npins;
 	unsigned int *pins;
 	u8 *pin_ids;
 };

 struct rzn1_pinctrl {
 	struct device *dev;
 	struct clk *clk;
 	struct pinctrl_dev *pctl;
 	u32 lev1_protect_phys;
 	u32 lev2_protect_phys;
 	int mdio_func[2];

 	struct rzn1_pin_group *groups;
 	unsigned int ngroups;

 	struct rzn1_pmx_func *functions;
 	unsigned int nfunctions;
 };

 struct rzn1_pinctrl_priv {
 	struct regmap *regmap;
 	u32 lev1_protect_phys;
 	u32 lev2_protect_phys;

 	struct clk *clk;
 };

 enum {
 	LOCK_LEVEL1 = 0x1,
 	LOCK_LEVEL2 = 0x2,
 	LOCK_ALL = LOCK_LEVEL1 | LOCK_LEVEL2,
 };

 static void rzn1_hw_set_lock(struct rzn1_pinctrl_priv *priv, u8 lock, u8 value)
 {
 	/*
 	 * The pinmux configuration is locked by writing the physical address of
 	 * the status_protect register to itself. It is unlocked by writing the
 	 * address | 1.
 	 */
 	if (lock & LOCK_LEVEL1) {
 		u32 val = priv->lev1_protect_phys | !(value & LOCK_LEVEL1);

 		level1_write(priv->regmap, status_protect, val);
 	}

 	if (lock & LOCK_LEVEL2) {
 		u32 val = priv->lev2_protect_phys | !(value & LOCK_LEVEL2);

 		level2_write(priv->regmap, status_protect, val);
 	}
 }

 static void rzn1_pinctrl_mdio_select(struct rzn1_pinctrl_priv *priv, int mdio,
 				     u32 func)
 {
 	debug("setting mdio%d to %u\n", mdio, func);

 	level2_write(priv->regmap, l2_mdio[mdio], func);
 }

 /*
  * Using a composite pin description, set the hardware pinmux registers
  * with the corresponding values.
  * Make sure to unlock write protection and reset it afterward.
  *
  * NOTE: There is no protection for potential concurrency, it is assumed these
  * calls are serialized already.
  */
 static int rzn1_set_hw_pin_func(struct rzn1_pinctrl_priv *priv,
 				unsigned int pin, unsigned int func)
 {
 	u32 l1_cache;
 	u32 l2_cache;
 	u32 l1;
 	u32 l2;

 	/* Level 3 MDIO multiplexing */
 	if (func >= RZN1_FUNC_MDIO0_HIGHZ &&
 	    func <= RZN1_FUNC_MDIO1_E1_SWITCH) {
 		int mdio_channel;
 		u32 mdio_func;

 		if (func <= RZN1_FUNC_MDIO1_HIGHZ)
 			mdio_channel = 0;
 		else
 			mdio_channel = 1;

 		/* Get MDIO func, and convert the func to the level 2 number */
 		if (func <= RZN1_FUNC_MDIO0_SWITCH) {
 			mdio_func = func - RZN1_FUNC_MDIO0_HIGHZ;
 			func = RZN1_FUNC_ETH_MDIO;
 		} else if (func <= RZN1_FUNC_MDIO0_E1_SWITCH) {
 			mdio_func = func - RZN1_FUNC_MDIO0_E1_HIGHZ;
 			func = RZN1_FUNC_ETH_MDIO_E1;
 		} else if (func <= RZN1_FUNC_MDIO1_SWITCH) {
 			mdio_func = func - RZN1_FUNC_MDIO1_HIGHZ;
 			func = RZN1_FUNC_ETH_MDIO;
 		} else {
 			mdio_func = func - RZN1_FUNC_MDIO1_E1_HIGHZ;
 			func = RZN1_FUNC_ETH_MDIO_E1;
 		}
 		rzn1_pinctrl_mdio_select(priv, mdio_channel, mdio_func);
 	}

 	/* Note here, we do not allow anything past the MDIO Mux values */
 	if (pin >= NUM_CONF || func >= RZN1_FUNC_MDIO0_HIGHZ)
 		return -EINVAL;

 	level1_read(priv->regmap, conf[pin], &l1);
 	l1_cache = l1;
 	level2_read(priv->regmap, conf[pin], &l2);
 	l2_cache = l2;

 	debug("setting func for pin %u to %u\n", pin, func);

 	l1 &= ~(RZN1_L1_FUNC_MASK << RZN1_L1_FUNCTION);

 	if (func < RZN1_FUNC_L2_OFFSET) {
 		l1 |= (func << RZN1_L1_FUNCTION);
 	} else {
 		l1 |= (RZN1_L1_FUNCTION_L2 << RZN1_L1_FUNCTION);

 		l2 = func - RZN1_FUNC_L2_OFFSET;
 	}

 	/* If either configuration changes, we update both anyway */
 	if (l1 != l1_cache || l2 != l2_cache) {
 		level1_write(priv->regmap, conf[pin], l1);
 		level2_write(priv->regmap, conf[pin], l2);
 	}

 	return 0;
 }

 static int rzn1_pinconf_set(struct rzn1_pinctrl_priv *priv, unsigned int pin,
 			    unsigned int bias, unsigned int strength)
 {
 	u32 l1, l1_cache;
 	u32 drv = RZN1_L1_PIN_DRIVE_STRENGTH_8MA;

 	level1_read(priv->regmap, conf[pin], &l1);
 	l1_cache = l1;

 	switch (bias) {
 	case PIN_CONFIG_BIAS_PULL_UP:
 		debug("set pin %d pull up\n", pin);
 		l1 &= ~(0x3 << RZN1_L1_PIN_PULL);
 		l1 |= (RZN1_L1_PIN_PULL_UP << RZN1_L1_PIN_PULL);
 		break;
 	case PIN_CONFIG_BIAS_PULL_DOWN:
 		debug("set pin %d pull down\n", pin);
 		l1 &= ~(0x3 << RZN1_L1_PIN_PULL);
 		l1 |= (RZN1_L1_PIN_PULL_DOWN << RZN1_L1_PIN_PULL);
 		break;
 	case PIN_CONFIG_BIAS_DISABLE:
 		debug("set pin %d bias off\n", pin);
 		l1 &= ~(0x3 << RZN1_L1_PIN_PULL);
 		l1 |= (RZN1_L1_PIN_PULL_NONE << RZN1_L1_PIN_PULL);
 		break;
 	}

 	switch (strength) {
 	case 4:
 		drv = RZN1_L1_PIN_DRIVE_STRENGTH_4MA;
 		break;
 	case 6:
 		drv = RZN1_L1_PIN_DRIVE_STRENGTH_6MA;
 		break;
 	case 8:
 		drv = RZN1_L1_PIN_DRIVE_STRENGTH_8MA;
 		break;
 	case 12:
 		drv = RZN1_L1_PIN_DRIVE_STRENGTH_12MA;
 		break;
 	}

 	debug("set pin %d drv %umA\n", pin, drv);

 	l1 &= ~(0x3 << RZN1_L1_PIN_DRIVE_STRENGTH);
 	l1 |= (drv << RZN1_L1_PIN_DRIVE_STRENGTH);

 	if (l1 != l1_cache)
 		level1_write(priv->regmap, conf[pin], l1);

 	return 0;
 }

 static int rzn1_pinctrl_set_state(struct udevice *dev, struct udevice *config)
 {
 	struct rzn1_pinctrl_priv *priv = dev_get_priv(dev);
 	int size;
 	int ret;
 	u32 val;
 	u32 bias;

 	/* Pullup/down bias, common to all pins in group */
 	bias = PIN_CONFIG_BIAS_PULL_UP;
 	if (dev_read_bool(config, "bias-disable"))
 		bias = PIN_CONFIG_BIAS_DISABLE;
 	else if (dev_read_bool(config, "bias-pull-up"))
 		bias = PIN_CONFIG_BIAS_PULL_UP;
 	else if (dev_read_bool(config, "bias-pull-down"))
 		bias = PIN_CONFIG_BIAS_PULL_DOWN;

 	/* Drive strength, common to all pins in group */
 	u32 strength = dev_read_u32_default(config, "drive-strength", 8);

 	/* Number of pins */
 	ret = dev_read_size(config, "pinmux");
 	if (ret < 0)
 		return ret;

 	size = ret / sizeof(val);

 	for (int i = 0; i < size; i++) {
 		ret = dev_read_u32_index(config, "pinmux", i, &val);
 		if (ret)
 			return ret;
 		unsigned int pin = val & 0xff;
 		unsigned int func = val >> 8;

 		debug("%s pin %d func %d bias %d strength %d\n",
 		      config->name, pin, func, bias, strength);

 		rzn1_hw_set_lock(priv, LOCK_ALL, LOCK_ALL);
 		rzn1_set_hw_pin_func(priv, pin, func);
 		rzn1_pinconf_set(priv, pin, bias, strength);
 		rzn1_hw_set_lock(priv, LOCK_ALL, 0);
 	}

 	return 0;
 }

 static struct pinctrl_ops rzn1_pinctrl_ops = {
 	.set_state = rzn1_pinctrl_set_state,
 };

 static int rzn1_pinctrl_probe(struct udevice *dev)
 {
 	struct rzn1_pinctrl_priv *priv = dev_get_priv(dev);
 	ofnode node = dev_ofnode(dev);
 	int ret;

 	ret = regmap_init_mem(node, &priv->regmap);
 	if (ret)
 		return ret;

 	priv->lev1_protect_phys = (u32)regmap_get_range(priv->regmap, 0) +
 		offsetof(struct rzn1_pinctrl_regs, status_protect);
 	priv->lev2_protect_phys = (u32)regmap_get_range(priv->regmap, 1) +
 		offsetof(struct rzn1_pinctrl_regs, status_protect);

 	return 0;
 }

 static const struct udevice_id rzn1_pinctrl_ids[] = {
 	{ .compatible = "renesas,rzn1-pinctrl", },
 	{ },
 };

 U_BOOT_DRIVER(pinctrl_rzn1) = {
 	.name	= "rzn1-pinctrl",
 	.id	= UCLASS_PINCTRL,
 	.of_match = rzn1_pinctrl_ids,
 	.priv_auto = sizeof(struct rzn1_pinctrl_priv),
 	.ops = &rzn1_pinctrl_ops,
 	.probe = rzn1_pinctrl_probe,
 	.flags = DM_FLAG_PRE_RELOC,
 };
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (C) 2014-2018 Renesas Electronics Europe Limited
	*
	* Phil Edworthy <phil.edworthy@renesas.com>
	* Based on a driver originally written by Michel Pollet at Renesas.
	*/

	#include <dt-bindings/pinctrl/rzn1-pinctrl.h>

	#include <dm/device.h>
	#include <dm/device_compat.h>
	#include <dm/pinctrl.h>
	#include <dm/read.h>
	#include <regmap.h>

	/* Field positions and masks in the pinmux registers */
	#define RZN1_L1_PIN_DRIVE_STRENGTH 10
	#define RZN1_L1_PIN_DRIVE_STRENGTH_4MA 0
	#define RZN1_L1_PIN_DRIVE_STRENGTH_6MA 1
	#define RZN1_L1_PIN_DRIVE_STRENGTH_8MA 2
	#define RZN1_L1_PIN_DRIVE_STRENGTH_12MA 3
	#define RZN1_L1_PIN_PULL 8
	#define RZN1_L1_PIN_PULL_NONE 0
	#define RZN1_L1_PIN_PULL_UP 1
	#define RZN1_L1_PIN_PULL_DOWN 3
	#define RZN1_L1_FUNCTION 0
	#define RZN1_L1_FUNC_MASK 0xf
	#define RZN1_L1_FUNCTION_L2 0xf

	/*
	* The hardware manual describes two levels of multiplexing, but it's more
	* logical to think of the hardware as three levels, with level 3 consisting of
	* the multiplexing for Ethernet MDIO signals.
	*
	* Level 1 functions go from 0 to 9, with level 1 function '15' (0xf) specifying
	* that level 2 functions are used instead. Level 2 has a lot more options,
	* going from 0 to 61. Level 3 allows selection of MDIO functions which can be
	* floating, or one of seven internal peripherals. Unfortunately, there are two
	* level 2 functions that can select MDIO, and two MDIO channels so we have four
	* sets of level 3 functions.
	*
	* For this driver, we've compounded the numbers together, so:
	* 0 to 9 is level 1
	* 10 to 71 is 10 + level 2 number
	* 72 to 79 is 72 + MDIO0 source for level 2 MDIO function.
	* 80 to 87 is 80 + MDIO0 source for level 2 MDIO_E1 function.
	* 88 to 95 is 88 + MDIO1 source for level 2 MDIO function.
	* 96 to 103 is 96 + MDIO1 source for level 2 MDIO_E1 function.
	* Examples:
	* Function 28 corresponds UART0
	* Function 73 corresponds to MDIO0 to GMAC0
	*
	* There are 170 configurable pins (called PL_GPIO in the datasheet).
	*/

	/*
	* Structure detailing the HW registers on the RZ/N1 devices.
	* Both the Level 1 mux registers and Level 2 mux registers have the same
	* structure. The only difference is that Level 2 has additional MDIO registers
	* at the end.
	*/
	struct rzn1_pinctrl_regs {
	u32 conf[170];
	u32 pad0[86];
	u32 status_protect; /* 0x400 */
	/* MDIO mux registers, level2 only */
	u32 l2_mdio[2];
	};

	#define NUM_CONF ARRAY_SIZE(((struct rzn1_pinctrl_regs *)0)->conf)

	#define level1_write(map, member, val) \
	regmap_range_set(map, 0, struct rzn1_pinctrl_regs, member, val)

	#define level1_read(map, member, valp) \
	regmap_range_get(map, 0, struct rzn1_pinctrl_regs, member, valp)

	#define level2_write(map, member, val) \
	regmap_range_set(map, 1, struct rzn1_pinctrl_regs, member, val)

	#define level2_read(map, member, valp) \
	regmap_range_get(map, 1, struct rzn1_pinctrl_regs, member, valp)

	/**
	* struct rzn1_pmx_func - describes rzn1 pinmux functions
	* @name: the name of this specific function
	* @groups: corresponding pin groups
	* @num_groups: the number of groups
	*/
	struct rzn1_pmx_func {
	const char *name;
	const char **groups;
	unsigned int num_groups;
	};

	/**
	* struct rzn1_pin_group - describes an rzn1 pin group
	* @name: the name of this specific pin group
	* @func: the name of the function selected by this group
	* @npins: the number of pins in this group array, i.e. the number of
	* elements in .pins so we can iterate over that array
	* @pins: array of pins. Needed due to pinctrl_ops.get_group_pins()
	* @pin_ids: array of pin_ids, i.e. the value used to select the mux
	*/
	struct rzn1_pin_group {
	const char *name;
	const char *func;
	unsigned int npins;
	unsigned int *pins;
	u8 *pin_ids;
	};

	struct rzn1_pinctrl {
	struct device *dev;
	struct clk *clk;
	struct pinctrl_dev *pctl;
	u32 lev1_protect_phys;
	u32 lev2_protect_phys;
	int mdio_func[2];

	struct rzn1_pin_group *groups;
	unsigned int ngroups;

	struct rzn1_pmx_func *functions;
	unsigned int nfunctions;
	};

	struct rzn1_pinctrl_priv {
	struct regmap *regmap;
	u32 lev1_protect_phys;
	u32 lev2_protect_phys;

	struct clk *clk;
	};

	enum {
	LOCK_LEVEL1 = 0x1,
	LOCK_LEVEL2 = 0x2,
	LOCK_ALL = LOCK_LEVEL1 \| LOCK_LEVEL2,
	};

	static void rzn1_hw_set_lock(struct rzn1_pinctrl_priv *priv, u8 lock, u8 value)
	{
	/*
	* The pinmux configuration is locked by writing the physical address of
	* the status_protect register to itself. It is unlocked by writing the
	* address \| 1.
	*/
	if (lock & LOCK_LEVEL1) {
	u32 val = priv->lev1_protect_phys \| !(value & LOCK_LEVEL1);

	level1_write(priv->regmap, status_protect, val);
	}

	if (lock & LOCK_LEVEL2) {
	u32 val = priv->lev2_protect_phys \| !(value & LOCK_LEVEL2);

	level2_write(priv->regmap, status_protect, val);
	}
	}

	static void rzn1_pinctrl_mdio_select(struct rzn1_pinctrl_priv *priv, int mdio,
	u32 func)
	{
	debug("setting mdio%d to %u\n", mdio, func);

	level2_write(priv->regmap, l2_mdio[mdio], func);
	}

	/*
	* Using a composite pin description, set the hardware pinmux registers
	* with the corresponding values.
	* Make sure to unlock write protection and reset it afterward.
	*
	* NOTE: There is no protection for potential concurrency, it is assumed these
	* calls are serialized already.
	*/
	static int rzn1_set_hw_pin_func(struct rzn1_pinctrl_priv *priv,
	unsigned int pin, unsigned int func)
	{
	u32 l1_cache;
	u32 l2_cache;
	u32 l1;
	u32 l2;

	/* Level 3 MDIO multiplexing */
	if (func >= RZN1_FUNC_MDIO0_HIGHZ &&
	func <= RZN1_FUNC_MDIO1_E1_SWITCH) {
	int mdio_channel;
	u32 mdio_func;

	if (func <= RZN1_FUNC_MDIO1_HIGHZ)
	mdio_channel = 0;
	else
	mdio_channel = 1;

	/* Get MDIO func, and convert the func to the level 2 number */
	if (func <= RZN1_FUNC_MDIO0_SWITCH) {
	mdio_func = func - RZN1_FUNC_MDIO0_HIGHZ;
	func = RZN1_FUNC_ETH_MDIO;
	} else if (func <= RZN1_FUNC_MDIO0_E1_SWITCH) {
	mdio_func = func - RZN1_FUNC_MDIO0_E1_HIGHZ;
	func = RZN1_FUNC_ETH_MDIO_E1;
	} else if (func <= RZN1_FUNC_MDIO1_SWITCH) {
	mdio_func = func - RZN1_FUNC_MDIO1_HIGHZ;
	func = RZN1_FUNC_ETH_MDIO;
	} else {
	mdio_func = func - RZN1_FUNC_MDIO1_E1_HIGHZ;
	func = RZN1_FUNC_ETH_MDIO_E1;
	}
	rzn1_pinctrl_mdio_select(priv, mdio_channel, mdio_func);
	}

	/* Note here, we do not allow anything past the MDIO Mux values */
	if (pin >= NUM_CONF \|\| func >= RZN1_FUNC_MDIO0_HIGHZ)
	return -EINVAL;

	level1_read(priv->regmap, conf[pin], &l1);
	l1_cache = l1;
	level2_read(priv->regmap, conf[pin], &l2);
	l2_cache = l2;

	debug("setting func for pin %u to %u\n", pin, func);

	l1 &= ~(RZN1_L1_FUNC_MASK << RZN1_L1_FUNCTION);

	if (func < RZN1_FUNC_L2_OFFSET) {
	l1 \|= (func << RZN1_L1_FUNCTION);
	} else {
	l1 \|= (RZN1_L1_FUNCTION_L2 << RZN1_L1_FUNCTION);

	l2 = func - RZN1_FUNC_L2_OFFSET;
	}

	/* If either configuration changes, we update both anyway */
	if (l1 != l1_cache \|\| l2 != l2_cache) {
	level1_write(priv->regmap, conf[pin], l1);
	level2_write(priv->regmap, conf[pin], l2);
	}

	return 0;
	}

	static int rzn1_pinconf_set(struct rzn1_pinctrl_priv *priv, unsigned int pin,
	unsigned int bias, unsigned int strength)
	{
	u32 l1, l1_cache;
	u32 drv = RZN1_L1_PIN_DRIVE_STRENGTH_8MA;

	level1_read(priv->regmap, conf[pin], &l1);
	l1_cache = l1;

	switch (bias) {
	case PIN_CONFIG_BIAS_PULL_UP:
	debug("set pin %d pull up\n", pin);
	l1 &= ~(0x3 << RZN1_L1_PIN_PULL);
	l1 \|= (RZN1_L1_PIN_PULL_UP << RZN1_L1_PIN_PULL);
	break;
	case PIN_CONFIG_BIAS_PULL_DOWN:
	debug("set pin %d pull down\n", pin);
	l1 &= ~(0x3 << RZN1_L1_PIN_PULL);
	l1 \|= (RZN1_L1_PIN_PULL_DOWN << RZN1_L1_PIN_PULL);
	break;
	case PIN_CONFIG_BIAS_DISABLE:
	debug("set pin %d bias off\n", pin);
	l1 &= ~(0x3 << RZN1_L1_PIN_PULL);
	l1 \|= (RZN1_L1_PIN_PULL_NONE << RZN1_L1_PIN_PULL);
	break;
	}

	switch (strength) {
	case 4:
	drv = RZN1_L1_PIN_DRIVE_STRENGTH_4MA;
	break;
	case 6:
	drv = RZN1_L1_PIN_DRIVE_STRENGTH_6MA;
	break;
	case 8:
	drv = RZN1_L1_PIN_DRIVE_STRENGTH_8MA;
	break;
	case 12:
	drv = RZN1_L1_PIN_DRIVE_STRENGTH_12MA;
	break;
	}

	debug("set pin %d drv %umA\n", pin, drv);

	l1 &= ~(0x3 << RZN1_L1_PIN_DRIVE_STRENGTH);
	l1 \|= (drv << RZN1_L1_PIN_DRIVE_STRENGTH);

	if (l1 != l1_cache)
	level1_write(priv->regmap, conf[pin], l1);

	return 0;
	}

	static int rzn1_pinctrl_set_state(struct udevice dev, struct udevice config)
	{
	struct rzn1_pinctrl_priv *priv = dev_get_priv(dev);
	int size;
	int ret;
	u32 val;
	u32 bias;

	/* Pullup/down bias, common to all pins in group */
	bias = PIN_CONFIG_BIAS_PULL_UP;
	if (dev_read_bool(config, "bias-disable"))
	bias = PIN_CONFIG_BIAS_DISABLE;
	else if (dev_read_bool(config, "bias-pull-up"))
	bias = PIN_CONFIG_BIAS_PULL_UP;
	else if (dev_read_bool(config, "bias-pull-down"))
	bias = PIN_CONFIG_BIAS_PULL_DOWN;

	/* Drive strength, common to all pins in group */
	u32 strength = dev_read_u32_default(config, "drive-strength", 8);

	/* Number of pins */
	ret = dev_read_size(config, "pinmux");
	if (ret < 0)
	return ret;

	size = ret / sizeof(val);

	for (int i = 0; i < size; i++) {
	ret = dev_read_u32_index(config, "pinmux", i, &val);
	if (ret)
	return ret;
	unsigned int pin = val & 0xff;
	unsigned int func = val >> 8;

	debug("%s pin %d func %d bias %d strength %d\n",
	config->name, pin, func, bias, strength);

	rzn1_hw_set_lock(priv, LOCK_ALL, LOCK_ALL);
	rzn1_set_hw_pin_func(priv, pin, func);
	rzn1_pinconf_set(priv, pin, bias, strength);
	rzn1_hw_set_lock(priv, LOCK_ALL, 0);
	}

	return 0;
	}

	static struct pinctrl_ops rzn1_pinctrl_ops = {
	.set_state = rzn1_pinctrl_set_state,
	};

	static int rzn1_pinctrl_probe(struct udevice *dev)
	{
	struct rzn1_pinctrl_priv *priv = dev_get_priv(dev);
	ofnode node = dev_ofnode(dev);
	int ret;

	ret = regmap_init_mem(node, &priv->regmap);
	if (ret)
	return ret;

	priv->lev1_protect_phys = (u32)regmap_get_range(priv->regmap, 0) +
	offsetof(struct rzn1_pinctrl_regs, status_protect);
	priv->lev2_protect_phys = (u32)regmap_get_range(priv->regmap, 1) +
	offsetof(struct rzn1_pinctrl_regs, status_protect);

	return 0;
	}

	static const struct udevice_id rzn1_pinctrl_ids[] = {
	{ .compatible = "renesas,rzn1-pinctrl", },
	{ },
	};

	U_BOOT_DRIVER(pinctrl_rzn1) = {
	.name = "rzn1-pinctrl",
	.id = UCLASS_PINCTRL,
	.of_match = rzn1_pinctrl_ids,
	.priv_auto = sizeof(struct rzn1_pinctrl_priv),
	.ops = &rzn1_pinctrl_ops,
	.probe = rzn1_pinctrl_probe,
	.flags = DM_FLAG_PRE_RELOC,
	};