Initial import

1 files changed, 2633 insertions, 0 deletions

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
new file mode 100644
index 000000000..1c76dcb50
--- /dev/null
+++ b/drivers/base/regmap/regmap.c
@@ -0,0 +1,2633 @@
+/*
+ * Register map access API
+ *
+ * Copyright 2011 Wolfson Microelectronics plc
+ *
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+#include <linux/mutex.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/rbtree.h>
+#include <linux/sched.h>
+
+#define CREATE_TRACE_POINTS
+#include "trace.h"
+
+#include "internal.h"
+
+/*
+ * Sometimes for failures during very early init the trace
+ * infrastructure isn't available early enough to be used.  For this
+ * sort of problem defining LOG_DEVICE will add printks for basic
+ * register I/O on a specific device.
+ */
+#undef LOG_DEVICE
+
+static int _regmap_update_bits(struct regmap *map, unsigned int reg,
+			       unsigned int mask, unsigned int val,
+			       bool *change);
+
+static int _regmap_bus_reg_read(void *context, unsigned int reg,
+				unsigned int *val);
+static int _regmap_bus_read(void *context, unsigned int reg,
+			    unsigned int *val);
+static int _regmap_bus_formatted_write(void *context, unsigned int reg,
+				       unsigned int val);
+static int _regmap_bus_reg_write(void *context, unsigned int reg,
+				 unsigned int val);
+static int _regmap_bus_raw_write(void *context, unsigned int reg,
+				 unsigned int val);
+
+bool regmap_reg_in_ranges(unsigned int reg,
+			  const struct regmap_range *ranges,
+			  unsigned int nranges)
+{
+	const struct regmap_range *r;
+	int i;
+
+	for (i = 0, r = ranges; i < nranges; i++, r++)
+		if (regmap_reg_in_range(reg, r))
+			return true;
+	return false;
+}
+EXPORT_SYMBOL_GPL(regmap_reg_in_ranges);
+
+bool regmap_check_range_table(struct regmap *map, unsigned int reg,
+			      const struct regmap_access_table *table)
+{
+	/* Check "no ranges" first */
+	if (regmap_reg_in_ranges(reg, table->no_ranges, table->n_no_ranges))
+		return false;
+
+	/* In case zero "yes ranges" are supplied, any reg is OK */
+	if (!table->n_yes_ranges)
+		return true;
+
+	return regmap_reg_in_ranges(reg, table->yes_ranges,
+				    table->n_yes_ranges);
+}
+EXPORT_SYMBOL_GPL(regmap_check_range_table);
+
+bool regmap_writeable(struct regmap *map, unsigned int reg)
+{
+	if (map->max_register && reg > map->max_register)
+		return false;
+
+	if (map->writeable_reg)
+		return map->writeable_reg(map->dev, reg);
+
+	if (map->wr_table)
+		return regmap_check_range_table(map, reg, map->wr_table);
+
+	return true;
+}
+
+bool regmap_readable(struct regmap *map, unsigned int reg)
+{
+	if (map->max_register && reg > map->max_register)
+		return false;
+
+	if (map->format.format_write)
+		return false;
+
+	if (map->readable_reg)
+		return map->readable_reg(map->dev, reg);
+
+	if (map->rd_table)
+		return regmap_check_range_table(map, reg, map->rd_table);
+
+	return true;
+}
+
+bool regmap_volatile(struct regmap *map, unsigned int reg)
+{
+	if (!map->format.format_write && !regmap_readable(map, reg))
+		return false;
+
+	if (map->volatile_reg)
+		return map->volatile_reg(map->dev, reg);
+
+	if (map->volatile_table)
+		return regmap_check_range_table(map, reg, map->volatile_table);
+
+	if (map->cache_ops)
+		return false;
+	else
+		return true;
+}
+
+bool regmap_precious(struct regmap *map, unsigned int reg)
+{
+	if (!regmap_readable(map, reg))
+		return false;
+
+	if (map->precious_reg)
+		return map->precious_reg(map->dev, reg);
+
+	if (map->precious_table)
+		return regmap_check_range_table(map, reg, map->precious_table);
+
+	return false;
+}
+
+static bool regmap_volatile_range(struct regmap *map, unsigned int reg,
+	size_t num)
+{
+	unsigned int i;
+
+	for (i = 0; i < num; i++)
+		if (!regmap_volatile(map, reg + i))
+			return false;
+
+	return true;
+}
+
+static void regmap_format_2_6_write(struct regmap *map,
+				     unsigned int reg, unsigned int val)
+{
+	u8 *out = map->work_buf;
+
+	*out = (reg << 6) | val;
+}
+
+static void regmap_format_4_12_write(struct regmap *map,
+				     unsigned int reg, unsigned int val)
+{
+	__be16 *out = map->work_buf;
+	*out = cpu_to_be16((reg << 12) | val);
+}
+
+static void regmap_format_7_9_write(struct regmap *map,
+				    unsigned int reg, unsigned int val)
+{
+	__be16 *out = map->work_buf;
+	*out = cpu_to_be16((reg << 9) | val);
+}
+
+static void regmap_format_10_14_write(struct regmap *map,
+				    unsigned int reg, unsigned int val)
+{
+	u8 *out = map->work_buf;
+
+	out[2] = val;
+	out[1] = (val >> 8) | (reg << 6);
+	out[0] = reg >> 2;
+}
+
+static void regmap_format_8(void *buf, unsigned int val, unsigned int shift)
+{
+	u8 *b = buf;
+
+	b[0] = val << shift;
+}
+
+static void regmap_format_16_be(void *buf, unsigned int val, unsigned int shift)
+{
+	__be16 *b = buf;
+
+	b[0] = cpu_to_be16(val << shift);
+}
+
+static void regmap_format_16_le(void *buf, unsigned int val, unsigned int shift)
+{
+	__le16 *b = buf;
+
+	b[0] = cpu_to_le16(val << shift);
+}
+
+static void regmap_format_16_native(void *buf, unsigned int val,
+				    unsigned int shift)
+{
+	*(u16 *)buf = val << shift;
+}
+
+static void regmap_format_24(void *buf, unsigned int val, unsigned int shift)
+{
+	u8 *b = buf;
+
+	val <<= shift;
+
+	b[0] = val >> 16;
+	b[1] = val >> 8;
+	b[2] = val;
+}
+
+static void regmap_format_32_be(void *buf, unsigned int val, unsigned int shift)
+{
+	__be32 *b = buf;
+
+	b[0] = cpu_to_be32(val << shift);
+}
+
+static void regmap_format_32_le(void *buf, unsigned int val, unsigned int shift)
+{
+	__le32 *b = buf;
+
+	b[0] = cpu_to_le32(val << shift);
+}
+
+static void regmap_format_32_native(void *buf, unsigned int val,
+				    unsigned int shift)
+{
+	*(u32 *)buf = val << shift;
+}
+
+static void regmap_parse_inplace_noop(void *buf)
+{
+}
+
+static unsigned int regmap_parse_8(const void *buf)
+{
+	const u8 *b = buf;
+
+	return b[0];
+}
+
+static unsigned int regmap_parse_16_be(const void *buf)
+{
+	const __be16 *b = buf;
+
+	return be16_to_cpu(b[0]);
+}
+
+static unsigned int regmap_parse_16_le(const void *buf)
+{
+	const __le16 *b = buf;
+
+	return le16_to_cpu(b[0]);
+}
+
+static void regmap_parse_16_be_inplace(void *buf)
+{
+	__be16 *b = buf;
+
+	b[0] = be16_to_cpu(b[0]);
+}
+
+static void regmap_parse_16_le_inplace(void *buf)
+{
+	__le16 *b = buf;
+
+	b[0] = le16_to_cpu(b[0]);
+}
+
+static unsigned int regmap_parse_16_native(const void *buf)
+{
+	return *(u16 *)buf;
+}
+
+static unsigned int regmap_parse_24(const void *buf)
+{
+	const u8 *b = buf;
+	unsigned int ret = b[2];
+	ret |= ((unsigned int)b[1]) << 8;
+	ret |= ((unsigned int)b[0]) << 16;
+
+	return ret;
+}
+
+static unsigned int regmap_parse_32_be(const void *buf)
+{
+	const __be32 *b = buf;
+
+	return be32_to_cpu(b[0]);
+}
+
+static unsigned int regmap_parse_32_le(const void *buf)
+{
+	const __le32 *b = buf;
+
+	return le32_to_cpu(b[0]);
+}
+
+static void regmap_parse_32_be_inplace(void *buf)
+{
+	__be32 *b = buf;
+
+	b[0] = be32_to_cpu(b[0]);
+}
+
+static void regmap_parse_32_le_inplace(void *buf)
+{
+	__le32 *b = buf;
+
+	b[0] = le32_to_cpu(b[0]);
+}
+
+static unsigned int regmap_parse_32_native(const void *buf)
+{
+	return *(u32 *)buf;
+}
+
+static void regmap_lock_mutex(void *__map)
+{
+	struct regmap *map = __map;
+	mutex_lock(&map->mutex);
+}
+
+static void regmap_unlock_mutex(void *__map)
+{
+	struct regmap *map = __map;
+	mutex_unlock(&map->mutex);
+}
+
+static void regmap_lock_spinlock(void *__map)
+__acquires(&map->spinlock)
+{
+	struct regmap *map = __map;
+	unsigned long flags;
+
+	spin_lock_irqsave(&map->spinlock, flags);
+	map->spinlock_flags = flags;
+}
+
+static void regmap_unlock_spinlock(void *__map)
+__releases(&map->spinlock)
+{
+	struct regmap *map = __map;
+	spin_unlock_irqrestore(&map->spinlock, map->spinlock_flags);
+}
+
+static void dev_get_regmap_release(struct device *dev, void *res)
+{
+	/*
+	 * We don't actually have anything to do here; the goal here
+	 * is not to manage the regmap but to provide a simple way to
+	 * get the regmap back given a struct device.
+	 */
+}
+
+static bool _regmap_range_add(struct regmap *map,
+			      struct regmap_range_node *data)
+{
+	struct rb_root *root = &map->range_tree;
+	struct rb_node **new = &(root->rb_node), *parent = NULL;
+
+	while (*new) {
+		struct regmap_range_node *this =
+			container_of(*new, struct regmap_range_node, node);
+
+		parent = *new;
+		if (data->range_max < this->range_min)
+			new = &((*new)->rb_left);
+		else if (data->range_min > this->range_max)
+			new = &((*new)->rb_right);
+		else
+			return false;
+	}
+
+	rb_link_node(&data->node, parent, new);
+	rb_insert_color(&data->node, root);
+
+	return true;
+}
+
+static struct regmap_range_node *_regmap_range_lookup(struct regmap *map,
+						      unsigned int reg)
+{
+	struct rb_node *node = map->range_tree.rb_node;
+
+	while (node) {
+		struct regmap_range_node *this =
+			container_of(node, struct regmap_range_node, node);
+
+		if (reg < this->range_min)
+			node = node->rb_left;
+		else if (reg > this->range_max)
+			node = node->rb_right;
+		else
+			return this;
+	}
+
+	return NULL;
+}
+
+static void regmap_range_exit(struct regmap *map)
+{
+	struct rb_node *next;
+	struct regmap_range_node *range_node;
+
+	next = rb_first(&map->range_tree);
+	while (next) {
+		range_node = rb_entry(next, struct regmap_range_node, node);
+		next = rb_next(&range_node->node);
+		rb_erase(&range_node->node, &map->range_tree);
+		kfree(range_node);
+	}
+
+	kfree(map->selector_work_buf);
+}
+
+int regmap_attach_dev(struct device *dev, struct regmap *map,
+		      const struct regmap_config *config)
+{
+	struct regmap **m;
+
+	map->dev = dev;
+
+	regmap_debugfs_init(map, config->name);
+
+	/* Add a devres resource for dev_get_regmap() */
+	m = devres_alloc(dev_get_regmap_release, sizeof(*m), GFP_KERNEL);
+	if (!m) {
+		regmap_debugfs_exit(map);
+		return -ENOMEM;
+	}
+	*m = map;
+	devres_add(dev, m);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(regmap_attach_dev);
+
+static enum regmap_endian regmap_get_reg_endian(const struct regmap_bus *bus,
+					const struct regmap_config *config)
+{
+	enum regmap_endian endian;
+
+	/* Retrieve the endianness specification from the regmap config */
+	endian = config->reg_format_endian;
+
+	/* If the regmap config specified a non-default value, use that */
+	if (endian != REGMAP_ENDIAN_DEFAULT)
+		return endian;
+
+	/* Retrieve the endianness specification from the bus config */
+	if (bus && bus->reg_format_endian_default)
+		endian = bus->reg_format_endian_default;
+
+	/* If the bus specified a non-default value, use that */
+	if (endian != REGMAP_ENDIAN_DEFAULT)
+		return endian;
+
+	/* Use this if no other value was found */
+	return REGMAP_ENDIAN_BIG;
+}
+
+enum regmap_endian regmap_get_val_endian(struct device *dev,
+					 const struct regmap_bus *bus,
+					 const struct regmap_config *config)
+{
+	struct device_node *np;
+	enum regmap_endian endian;
+
+	/* Retrieve the endianness specification from the regmap config */
+	endian = config->val_format_endian;
+
+	/* If the regmap config specified a non-default value, use that */
+	if (endian != REGMAP_ENDIAN_DEFAULT)
+		return endian;
+
+	/* If the dev and dev->of_node exist try to get endianness from DT */
+	if (dev && dev->of_node) {
+		np = dev->of_node;
+
+		/* Parse the device's DT node for an endianness specification */
+		if (of_property_read_bool(np, "big-endian"))
+			endian = REGMAP_ENDIAN_BIG;
+		else if (of_property_read_bool(np, "little-endian"))
+			endian = REGMAP_ENDIAN_LITTLE;
+
+		/* If the endianness was specified in DT, use that */
+		if (endian != REGMAP_ENDIAN_DEFAULT)
+			return endian;
+	}
+
+	/* Retrieve the endianness specification from the bus config */
+	if (bus && bus->val_format_endian_default)
+		endian = bus->val_format_endian_default;
+
+	/* If the bus specified a non-default value, use that */
+	if (endian != REGMAP_ENDIAN_DEFAULT)
+		return endian;
+
+	/* Use this if no other value was found */
+	return REGMAP_ENDIAN_BIG;
+}
+EXPORT_SYMBOL_GPL(regmap_get_val_endian);
+
+/**
+ * regmap_init(): Initialise register map
+ *
+ * @dev: Device that will be interacted with
+ * @bus: Bus-specific callbacks to use with device
+ * @bus_context: Data passed to bus-specific callbacks
+ * @config: Configuration for register map
+ *
+ * The return value will be an ERR_PTR() on error or a valid pointer to
+ * a struct regmap.  This function should generally not be called
+ * directly, it should be called by bus-specific init functions.
+ */
+struct regmap *regmap_init(struct device *dev,
+			   const struct regmap_bus *bus,
+			   void *bus_context,
+			   const struct regmap_config *config)
+{
+	struct regmap *map;
+	int ret = -EINVAL;
+	enum regmap_endian reg_endian, val_endian;
+	int i, j;
+
+	if (!config)
+		goto err;
+
+	map = kzalloc(sizeof(*map), GFP_KERNEL);
+	if (map == NULL) {
+		ret = -ENOMEM;
+		goto err;
+	}
+
+	if (config->lock && config->unlock) {
+		map->lock = config->lock;
+		map->unlock = config->unlock;
+		map->lock_arg = config->lock_arg;
+	} else {
+		if ((bus && bus->fast_io) ||
+		    config->fast_io) {
+			spin_lock_init(&map->spinlock);
+			map->lock = regmap_lock_spinlock;
+			map->unlock = regmap_unlock_spinlock;
+		} else {
+			mutex_init(&map->mutex);
+			map->lock = regmap_lock_mutex;
+			map->unlock = regmap_unlock_mutex;
+		}
+		map->lock_arg = map;
+	}
+	map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8);
+	map->format.pad_bytes = config->pad_bits / 8;
+	map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8);
+	map->format.buf_size = DIV_ROUND_UP(config->reg_bits +
+			config->val_bits + config->pad_bits, 8);
+	map->reg_shift = config->pad_bits % 8;
+	if (config->reg_stride)
+		map->reg_stride = config->reg_stride;
+	else
+		map->reg_stride = 1;
+	map->use_single_rw = config->use_single_rw;
+	map->can_multi_write = config->can_multi_write;
+	map->dev = dev;
+	map->bus = bus;
+	map->bus_context = bus_context;
+	map->max_register = config->max_register;
+	map->wr_table = config->wr_table;
+	map->rd_table = config->rd_table;
+	map->volatile_table = config->volatile_table;
+	map->precious_table = config->precious_table;
+	map->writeable_reg = config->writeable_reg;
+	map->readable_reg = config->readable_reg;
+	map->volatile_reg = config->volatile_reg;
+	map->precious_reg = config->precious_reg;
+	map->cache_type = config->cache_type;
+	map->name = config->name;
+
+	spin_lock_init(&map->async_lock);
+	INIT_LIST_HEAD(&map->async_list);
+	INIT_LIST_HEAD(&map->async_free);
+	init_waitqueue_head(&map->async_waitq);
+
+	if (config->read_flag_mask || config->write_flag_mask) {
+		map->read_flag_mask = config->read_flag_mask;
+		map->write_flag_mask = config->write_flag_mask;
+	} else if (bus) {
+		map->read_flag_mask = bus->read_flag_mask;
+	}
+
+	if (!bus) {
+		map->reg_read  = config->reg_read;
+		map->reg_write = config->reg_write;
+
+		map->defer_caching = false;
+		goto skip_format_initialization;
+	} else if (!bus->read || !bus->write) {
+		map->reg_read = _regmap_bus_reg_read;
+		map->reg_write = _regmap_bus_reg_write;
+
+		map->defer_caching = false;
+		goto skip_format_initialization;
+	} else {
+		map->reg_read  = _regmap_bus_read;
+	}
+
+	reg_endian = regmap_get_reg_endian(bus, config);
+	val_endian = regmap_get_val_endian(dev, bus, config);
+
+	switch (config->reg_bits + map->reg_shift) {
+	case 2:
+		switch (config->val_bits) {
+		case 6:
+			map->format.format_write = regmap_format_2_6_write;
+			break;
+		default:
+			goto err_map;
+		}
+		break;
+
+	case 4:
+		switch (config->val_bits) {
+		case 12:
+			map->format.format_write = regmap_format_4_12_write;
+			break;
+		default:
+			goto err_map;
+		}
+		break;
+
+	case 7:
+		switch (config->val_bits) {
+		case 9:
+			map->format.format_write = regmap_format_7_9_write;
+			break;
+		default:
+			goto err_map;
+		}
+		break;
+
+	case 10:
+		switch (config->val_bits) {
+		case 14:
+			map->format.format_write = regmap_format_10_14_write;
+			break;
+		default:
+			goto err_map;
+		}
+		break;
+
+	case 8:
+		map->format.format_reg = regmap_format_8;
+		break;
+
+	case 16:
+		switch (reg_endian) {
+		case REGMAP_ENDIAN_BIG:
+			map->format.format_reg = regmap_format_16_be;
+			break;
+		case REGMAP_ENDIAN_NATIVE:
+			map->format.format_reg = regmap_format_16_native;
+			break;
+		default:
+			goto err_map;
+		}
+		break;
+
+	case 24:
+		if (reg_endian != REGMAP_ENDIAN_BIG)
+			goto err_map;
+		map->format.format_reg = regmap_format_24;
+		break;
+
+	case 32:
+		switch (reg_endian) {
+		case REGMAP_ENDIAN_BIG:
+			map->format.format_reg = regmap_format_32_be;
+			break;
+		case REGMAP_ENDIAN_NATIVE:
+			map->format.format_reg = regmap_format_32_native;
+			break;
+		default:
+			goto err_map;
+		}
+		break;
+
+	default:
+		goto err_map;
+	}
+
+	if (val_endian == REGMAP_ENDIAN_NATIVE)
+		map->format.parse_inplace = regmap_parse_inplace_noop;
+
+	switch (config->val_bits) {
+	case 8:
+		map->format.format_val = regmap_format_8;
+		map->format.parse_val = regmap_parse_8;
+		map->format.parse_inplace = regmap_parse_inplace_noop;
+		break;
+	case 16:
+		switch (val_endian) {
+		case REGMAP_ENDIAN_BIG:
+			map->format.format_val = regmap_format_16_be;
+			map->format.parse_val = regmap_parse_16_be;
+			map->format.parse_inplace = regmap_parse_16_be_inplace;
+			break;
+		case REGMAP_ENDIAN_LITTLE:
+			map->format.format_val = regmap_format_16_le;
+			map->format.parse_val = regmap_parse_16_le;
+			map->format.parse_inplace = regmap_parse_16_le_inplace;
+			break;
+		case REGMAP_ENDIAN_NATIVE:
+			map->format.format_val = regmap_format_16_native;
+			map->format.parse_val = regmap_parse_16_native;
+			break;
+		default:
+			goto err_map;
+		}
+		break;
+	case 24:
+		if (val_endian != REGMAP_ENDIAN_BIG)
+			goto err_map;
+		map->format.format_val = regmap_format_24;
+		map->format.parse_val = regmap_parse_24;
+		break;
+	case 32:
+		switch (val_endian) {
+		case REGMAP_ENDIAN_BIG:
+			map->format.format_val = regmap_format_32_be;
+			map->format.parse_val = regmap_parse_32_be;
+			map->format.parse_inplace = regmap_parse_32_be_inplace;
+			break;
+		case REGMAP_ENDIAN_LITTLE:
+			map->format.format_val = regmap_format_32_le;
+			map->format.parse_val = regmap_parse_32_le;
+			map->format.parse_inplace = regmap_parse_32_le_inplace;
+			break;
+		case REGMAP_ENDIAN_NATIVE:
+			map->format.format_val = regmap_format_32_native;
+			map->format.parse_val = regmap_parse_32_native;
+			break;
+		default:
+			goto err_map;
+		}
+		break;
+	}
+
+	if (map->format.format_write) {
+		if ((reg_endian != REGMAP_ENDIAN_BIG) ||
+		    (val_endian != REGMAP_ENDIAN_BIG))
+			goto err_map;
+		map->use_single_rw = true;
+	}
+
+	if (!map->format.format_write &&
+	    !(map->format.format_reg && map->format.format_val))
+		goto err_map;
+
+	map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL);
+	if (map->work_buf == NULL) {
+		ret = -ENOMEM;
+		goto err_map;
+	}
+
+	if (map->format.format_write) {
+		map->defer_caching = false;
+		map->reg_write = _regmap_bus_formatted_write;
+	} else if (map->format.format_val) {
+		map->defer_caching = true;
+		map->reg_write = _regmap_bus_raw_write;
+	}
+
+skip_format_initialization:
+
+	map->range_tree = RB_ROOT;
+	for (i = 0; i < config->num_ranges; i++) {
+		const struct regmap_range_cfg *range_cfg = &config->ranges[i];
+		struct regmap_range_node *new;
+
+		/* Sanity check */
+		if (range_cfg->range_max < range_cfg->range_min) {
+			dev_err(map->dev, "Invalid range %d: %d < %d\n", i,
+				range_cfg->range_max, range_cfg->range_min);
+			goto err_range;
+		}
+
+		if (range_cfg->range_max > map->max_register) {
+			dev_err(map->dev, "Invalid range %d: %d > %d\n", i,
+				range_cfg->range_max, map->max_register);
+			goto err_range;
+		}
+
+		if (range_cfg->selector_reg > map->max_register) {
+			dev_err(map->dev,
+				"Invalid range %d: selector out of map\n", i);
+			goto err_range;
+		}
+
+		if (range_cfg->window_len == 0) {
+			dev_err(map->dev, "Invalid range %d: window_len 0\n",
+				i);
+			goto err_range;
+		}
+
+		/* Make sure, that this register range has no selector
+		   or data window within its boundary */
+		for (j = 0; j < config->num_ranges; j++) {
+			unsigned sel_reg = config->ranges[j].selector_reg;
+			unsigned win_min = config->ranges[j].window_start;
+			unsigned win_max = win_min +
+					   config->ranges[j].window_len - 1;
+
+			/* Allow data window inside its own virtual range */
+			if (j == i)
+				continue;
+
+			if (range_cfg->range_min <= sel_reg &&
+			    sel_reg <= range_cfg->range_max) {
+				dev_err(map->dev,
+					"Range %d: selector for %d in window\n",
+					i, j);
+				goto err_range;
+			}
+
+			if (!(win_max < range_cfg->range_min ||
+			      win_min > range_cfg->range_max)) {
+				dev_err(map->dev,
+					"Range %d: window for %d in window\n",
+					i, j);
+				goto err_range;
+			}
+		}
+
+		new = kzalloc(sizeof(*new), GFP_KERNEL);
+		if (new == NULL) {
+			ret = -ENOMEM;
+			goto err_range;
+		}
+
+		new->map = map;
+		new->name = range_cfg->name;
+		new->range_min = range_cfg->range_min;
+		new->range_max = range_cfg->range_max;
+		new->selector_reg = range_cfg->selector_reg;
+		new->selector_mask = range_cfg->selector_mask;
+		new->selector_shift = range_cfg->selector_shift;
+		new->window_start = range_cfg->window_start;
+		new->window_len = range_cfg->window_len;
+
+		if (!_regmap_range_add(map, new)) {
+			dev_err(map->dev, "Failed to add range %d\n", i);
+			kfree(new);
+			goto err_range;
+		}
+
+		if (map->selector_work_buf == NULL) {
+			map->selector_work_buf =
+				kzalloc(map->format.buf_size, GFP_KERNEL);
+			if (map->selector_work_buf == NULL) {
+				ret = -ENOMEM;
+				goto err_range;
+			}
+		}
+	}
+
+	ret = regcache_init(map, config);
+	if (ret != 0)
+		goto err_range;
+
+	if (dev) {
+		ret = regmap_attach_dev(dev, map, config);
+		if (ret != 0)
+			goto err_regcache;
+	}
+
+	return map;
+
+err_regcache:
+	regcache_exit(map);
+err_range:
+	regmap_range_exit(map);
+	kfree(map->work_buf);
+err_map:
+	kfree(map);
+err:
+	return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(regmap_init);
+
+static void devm_regmap_release(struct device *dev, void *res)
+{
+	regmap_exit(*(struct regmap **)res);
+}
+
+/**
+ * devm_regmap_init(): Initialise managed register map
+ *
+ * @dev: Device that will be interacted with
+ * @bus: Bus-specific callbacks to use with device
+ * @bus_context: Data passed to bus-specific callbacks
+ * @config: Configuration for register map
+ *
+ * The return value will be an ERR_PTR() on error or a valid pointer
+ * to a struct regmap.  This function should generally not be called
+ * directly, it should be called by bus-specific init functions.  The
+ * map will be automatically freed by the device management code.
+ */
+struct regmap *devm_regmap_init(struct device *dev,
+				const struct regmap_bus *bus,
+				void *bus_context,
+				const struct regmap_config *config)
+{
+	struct regmap **ptr, *regmap;
+
+	ptr = devres_alloc(devm_regmap_release, sizeof(*ptr), GFP_KERNEL);
+	if (!ptr)
+		return ERR_PTR(-ENOMEM);
+
+	regmap = regmap_init(dev, bus, bus_context, config);
+	if (!IS_ERR(regmap)) {
+		*ptr = regmap;
+		devres_add(dev, ptr);
+	} else {
+		devres_free(ptr);
+	}
+
+	return regmap;
+}
+EXPORT_SYMBOL_GPL(devm_regmap_init);
+
+static void regmap_field_init(struct regmap_field *rm_field,
+	struct regmap *regmap, struct reg_field reg_field)
+{
+	rm_field->regmap = regmap;
+	rm_field->reg = reg_field.reg;
+	rm_field->shift = reg_field.lsb;
+	rm_field->mask = GENMASK(reg_field.msb, reg_field.lsb);
+	rm_field->id_size = reg_field.id_size;
+	rm_field->id_offset = reg_field.id_offset;
+}
+
+/**
+ * devm_regmap_field_alloc(): Allocate and initialise a register field
+ * in a register map.
+ *
+ * @dev: Device that will be interacted with
+ * @regmap: regmap bank in which this register field is located.
+ * @reg_field: Register field with in the bank.
+ *
+ * The return value will be an ERR_PTR() on error or a valid pointer
+ * to a struct regmap_field. The regmap_field will be automatically freed
+ * by the device management code.
+ */
+struct regmap_field *devm_regmap_field_alloc(struct device *dev,
+		struct regmap *regmap, struct reg_field reg_field)
+{
+	struct regmap_field *rm_field = devm_kzalloc(dev,
+					sizeof(*rm_field), GFP_KERNEL);
+	if (!rm_field)
+		return ERR_PTR(-ENOMEM);
+
+	regmap_field_init(rm_field, regmap, reg_field);
+
+	return rm_field;
+
+}
+EXPORT_SYMBOL_GPL(devm_regmap_field_alloc);
+
+/**
+ * devm_regmap_field_free(): Free register field allocated using
+ * devm_regmap_field_alloc. Usally drivers need not call this function,
+ * as the memory allocated via devm will be freed as per device-driver
+ * life-cyle.
+ *
+ * @dev: Device that will be interacted with
+ * @field: regmap field which should be freed.
+ */
+void devm_regmap_field_free(struct device *dev,
+	struct regmap_field *field)
+{
+	devm_kfree(dev, field);
+}
+EXPORT_SYMBOL_GPL(devm_regmap_field_free);
+
+/**
+ * regmap_field_alloc(): Allocate and initialise a register field
+ * in a register map.
+ *
+ * @regmap: regmap bank in which this register field is located.
+ * @reg_field: Register field with in the bank.
+ *
+ * The return value will be an ERR_PTR() on error or a valid pointer
+ * to a struct regmap_field. The regmap_field should be freed by the
+ * user once its finished working with it using regmap_field_free().
+ */
+struct regmap_field *regmap_field_alloc(struct regmap *regmap,
+		struct reg_field reg_field)
+{
+	struct regmap_field *rm_field = kzalloc(sizeof(*rm_field), GFP_KERNEL);
+
+	if (!rm_field)
+		return ERR_PTR(-ENOMEM);
+
+	regmap_field_init(rm_field, regmap, reg_field);
+
+	return rm_field;
+}
+EXPORT_SYMBOL_GPL(regmap_field_alloc);
+
+/**
+ * regmap_field_free(): Free register field allocated using regmap_field_alloc
+ *
+ * @field: regmap field which should be freed.
+ */
+void regmap_field_free(struct regmap_field *field)
+{
+	kfree(field);
+}
+EXPORT_SYMBOL_GPL(regmap_field_free);
+
+/**
+ * regmap_reinit_cache(): Reinitialise the current register cache
+ *
+ * @map: Register map to operate on.
+ * @config: New configuration.  Only the cache data will be used.
+ *
+ * Discard any existing register cache for the map and initialize a
+ * new cache.  This can be used to restore the cache to defaults or to
+ * update the cache configuration to reflect runtime discovery of the
+ * hardware.
+ *
+ * No explicit locking is done here, the user needs to ensure that
+ * this function will not race with other calls to regmap.
+ */
+int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config)
+{
+	regcache_exit(map);
+	regmap_debugfs_exit(map);
+
+	map->max_register = config->max_register;
+	map->writeable_reg = config->writeable_reg;
+	map->readable_reg = config->readable_reg;
+	map->volatile_reg = config->volatile_reg;
+	map->precious_reg = config->precious_reg;
+	map->cache_type = config->cache_type;
+
+	regmap_debugfs_init(map, config->name);
+
+	map->cache_bypass = false;
+	map->cache_only = false;
+
+	return regcache_init(map, config);
+}
+EXPORT_SYMBOL_GPL(regmap_reinit_cache);
+
+/**
+ * regmap_exit(): Free a previously allocated register map
+ */
+void regmap_exit(struct regmap *map)
+{
+	struct regmap_async *async;
+
+	regcache_exit(map);
+	regmap_debugfs_exit(map);
+	regmap_range_exit(map);
+	if (map->bus && map->bus->free_context)
+		map->bus->free_context(map->bus_context);
+	kfree(map->work_buf);
+	while (!list_empty(&map->async_free)) {
+		async = list_first_entry_or_null(&map->async_free,
+						 struct regmap_async,
+						 list);
+		list_del(&async->list);
+		kfree(async->work_buf);
+		kfree(async);
+	}
+	kfree(map);
+}
+EXPORT_SYMBOL_GPL(regmap_exit);
+
+static int dev_get_regmap_match(struct device *dev, void *res, void *data)
+{
+	struct regmap **r = res;
+	if (!r || !*r) {
+		WARN_ON(!r || !*r);
+		return 0;
+	}
+
+	/* If the user didn't specify a name match any */
+	if (data)
+		return (*r)->name == data;
+	else
+		return 1;
+}
+
+/**
+ * dev_get_regmap(): Obtain the regmap (if any) for a device
+ *
+ * @dev: Device to retrieve the map for
+ * @name: Optional name for the register map, usually NULL.
+ *
+ * Returns the regmap for the device if one is present, or NULL.  If
+ * name is specified then it must match the name specified when
+ * registering the device, if it is NULL then the first regmap found
+ * will be used.  Devices with multiple register maps are very rare,
+ * generic code should normally not need to specify a name.
+ */
+struct regmap *dev_get_regmap(struct device *dev, const char *name)
+{
+	struct regmap **r = devres_find(dev, dev_get_regmap_release,
+					dev_get_regmap_match, (void *)name);
+
+	if (!r)
+		return NULL;
+	return *r;
+}
+EXPORT_SYMBOL_GPL(dev_get_regmap);
+
+/**
+ * regmap_get_device(): Obtain the device from a regmap
+ *
+ * @map: Register map to operate on.
+ *
+ * Returns the underlying device that the regmap has been created for.
+ */
+struct device *regmap_get_device(struct regmap *map)
+{
+	return map->dev;
+}
+EXPORT_SYMBOL_GPL(regmap_get_device);
+
+static int _regmap_select_page(struct regmap *map, unsigned int *reg,
+			       struct regmap_range_node *range,
+			       unsigned int val_num)
+{
+	void *orig_work_buf;
+	unsigned int win_offset;
+	unsigned int win_page;
+	bool page_chg;
+	int ret;
+
+	win_offset = (*reg - range->range_min) % range->window_len;
+	win_page = (*reg - range->range_min) / range->window_len;
+
+	if (val_num > 1) {
+		/* Bulk write shouldn't cross range boundary */
+		if (*reg + val_num - 1 > range->range_max)
+			return -EINVAL;
+
+		/* ... or single page boundary */
+		if (val_num > range->window_len - win_offset)
+			return -EINVAL;
+	}
+
+	/* It is possible to have selector register inside data window.
+	   In that case, selector register is located on every page and
+	   it needs no page switching, when accessed alone. */
+	if (val_num > 1 ||
+	    range->window_start + win_offset != range->selector_reg) {
+		/* Use separate work_buf during page switching */
+		orig_work_buf = map->work_buf;
+		map->work_buf = map->selector_work_buf;
+
+		ret = _regmap_update_bits(map, range->selector_reg,
+					  range->selector_mask,
+					  win_page << range->selector_shift,
+					  &page_chg);
+
+		map->work_buf = orig_work_buf;
+
+		if (ret != 0)
+			return ret;
+	}
+
+	*reg = range->window_start + win_offset;
+
+	return 0;
+}
+
+int _regmap_raw_write(struct regmap *map, unsigned int reg,
+		      const void *val, size_t val_len)
+{
+	struct regmap_range_node *range;
+	unsigned long flags;
+	u8 *u8 = map->work_buf;
+	void *work_val = map->work_buf + map->format.reg_bytes +
+		map->format.pad_bytes;
+	void *buf;
+	int ret = -ENOTSUPP;
+	size_t len;
+	int i;
+
+	WARN_ON(!map->bus);
+
+	/* Check for unwritable registers before we start */
+	if (map->writeable_reg)
+		for (i = 0; i < val_len / map->format.val_bytes; i++)
+			if (!map->writeable_reg(map->dev,
+						reg + (i * map->reg_stride)))
+				return -EINVAL;
+
+	if (!map->cache_bypass && map->format.parse_val) {
+		unsigned int ival;
+		int val_bytes = map->format.val_bytes;
+		for (i = 0; i < val_len / val_bytes; i++) {
+			ival = map->format.parse_val(val + (i * val_bytes));
+			ret = regcache_write(map, reg + (i * map->reg_stride),
+					     ival);
+			if (ret) {
+				dev_err(map->dev,
+					"Error in caching of register: %x ret: %d\n",
+					reg + i, ret);
+				return ret;
+			}
+		}
+		if (map->cache_only) {
+			map->cache_dirty = true;
+			return 0;
+		}
+	}
+
+	range = _regmap_range_lookup(map, reg);
+	if (range) {
+		int val_num = val_len / map->format.val_bytes;
+		int win_offset = (reg - range->range_min) % range->window_len;
+		int win_residue = range->window_len - win_offset;
+
+		/* If the write goes beyond the end of the window split it */
+		while (val_num > win_residue) {
+			dev_dbg(map->dev, "Writing window %d/%zu\n",
+				win_residue, val_len / map->format.val_bytes);
+			ret = _regmap_raw_write(map, reg, val, win_residue *
+						map->format.val_bytes);
+			if (ret != 0)
+				return ret;
+
+			reg += win_residue;
+			val_num -= win_residue;
+			val += win_residue * map->format.val_bytes;
+			val_len -= win_residue * map->format.val_bytes;
+
+			win_offset = (reg - range->range_min) %
+				range->window_len;
+			win_residue = range->window_len - win_offset;
+		}
+
+		ret = _regmap_select_page(map, &reg, range, val_num);
+		if (ret != 0)
+			return ret;
+	}
+
+	map->format.format_reg(map->work_buf, reg, map->reg_shift);
+
+	u8[0] |= map->write_flag_mask;
+
+	/*
+	 * Essentially all I/O mechanisms will be faster with a single
+	 * buffer to write.  Since register syncs often generate raw
+	 * writes of single registers optimise that case.
+	 */
+	if (val != work_val && val_len == map->format.val_bytes) {
+		memcpy(work_val, val, map->format.val_bytes);
+		val = work_val;
+	}
+
+	if (map->async && map->bus->async_write) {
+		struct regmap_async *async;
+
+		trace_regmap_async_write_start(map, reg, val_len);
+
+		spin_lock_irqsave(&map->async_lock, flags);
+		async = list_first_entry_or_null(&map->async_free,
+						 struct regmap_async,
+						 list);
+		if (async)
+			list_del(&async->list);
+		spin_unlock_irqrestore(&map->async_lock, flags);
+
+		if (!async) {
+			async = map->bus->async_alloc();
+			if (!async)
+				return -ENOMEM;
+
+			async->work_buf = kzalloc(map->format.buf_size,
+						  GFP_KERNEL | GFP_DMA);
+			if (!async->work_buf) {
+				kfree(async);
+				return -ENOMEM;
+			}
+		}
+
+		async->map = map;
+
+		/* If the caller supplied the value we can use it safely. */
+		memcpy(async->work_buf, map->work_buf, map->format.pad_bytes +
+		       map->format.reg_bytes + map->format.val_bytes);
+
+		spin_lock_irqsave(&map->async_lock, flags);
+		list_add_tail(&async->list, &map->async_list);
+		spin_unlock_irqrestore(&map->async_lock, flags);
+
+		if (val != work_val)
+			ret = map->bus->async_write(map->bus_context,
+						    async->work_buf,
+						    map->format.reg_bytes +
+						    map->format.pad_bytes,
+						    val, val_len, async);
+		else
+			ret = map->bus->async_write(map->bus_context,
+						    async->work_buf,
+						    map->format.reg_bytes +
+						    map->format.pad_bytes +
+						    val_len, NULL, 0, async);
+
+		if (ret != 0) {
+			dev_err(map->dev, "Failed to schedule write: %d\n",
+				ret);
+
+			spin_lock_irqsave(&map->async_lock, flags);
+			list_move(&async->list, &map->async_free);
+			spin_unlock_irqrestore(&map->async_lock, flags);
+		}
+
+		return ret;
+	}
+
+	trace_regmap_hw_write_start(map, reg, val_len / map->format.val_bytes);
+
+	/* If we're doing a single register write we can probably just
+	 * send the work_buf directly, otherwise try to do a gather
+	 * write.
+	 */
+	if (val == work_val)
+		ret = map->bus->write(map->bus_context, map->work_buf,
+				      map->format.reg_bytes +
+				      map->format.pad_bytes +
+				      val_len);
+	else if (map->bus->gather_write)
+		ret = map->bus->gather_write(map->bus_context, map->work_buf,
+					     map->format.reg_bytes +
+					     map->format.pad_bytes,
+					     val, val_len);
+
+	/* If that didn't work fall back on linearising by hand. */
+	if (ret == -ENOTSUPP) {
+		len = map->format.reg_bytes + map->format.pad_bytes + val_len;
+		buf = kzalloc(len, GFP_KERNEL);
+		if (!buf)
+			return -ENOMEM;
+
+		memcpy(buf, map->work_buf, map->format.reg_bytes);
+		memcpy(buf + map->format.reg_bytes + map->format.pad_bytes,
+		       val, val_len);
+		ret = map->bus->write(map->bus_context, buf, len);
+
+		kfree(buf);
+	}
+
+	trace_regmap_hw_write_done(map, reg, val_len / map->format.val_bytes);
+
+	return ret;
+}
+
+/**
+ * regmap_can_raw_write - Test if regmap_raw_write() is supported
+ *
+ * @map: Map to check.
+ */
+bool regmap_can_raw_write(struct regmap *map)
+{
+	return map->bus && map->format.format_val && map->format.format_reg;
+}
+EXPORT_SYMBOL_GPL(regmap_can_raw_write);
+
+static int _regmap_bus_formatted_write(void *context, unsigned int reg,
+				       unsigned int val)
+{
+	int ret;
+	struct regmap_range_node *range;
+	struct regmap *map = context;
+
+	WARN_ON(!map->bus || !map->format.format_write);
+
+	range = _regmap_range_lookup(map, reg);
+	if (range) {
+		ret = _regmap_select_page(map, &reg, range, 1);
+		if (ret != 0)
+			return ret;
+	}
+
+	map->format.format_write(map, reg, val);
+
+	trace_regmap_hw_write_start(map, reg, 1);
+
+	ret = map->bus->write(map->bus_context, map->work_buf,
+			      map->format.buf_size);
+
+	trace_regmap_hw_write_done(map, reg, 1);
+
+	return ret;
+}
+
+static int _regmap_bus_reg_write(void *context, unsigned int reg,
+				 unsigned int val)
+{
+	struct regmap *map = context;
+
+	return map->bus->reg_write(map->bus_context, reg, val);
+}
+
+static int _regmap_bus_raw_write(void *context, unsigned int reg,
+				 unsigned int val)
+{
+	struct regmap *map = context;
+
+	WARN_ON(!map->bus || !map->format.format_val);
+
+	map->format.format_val(map->work_buf + map->format.reg_bytes
+			       + map->format.pad_bytes, val, 0);
+	return _regmap_raw_write(map, reg,
+				 map->work_buf +
+				 map->format.reg_bytes +
+				 map->format.pad_bytes,
+				 map->format.val_bytes);
+}
+
+static inline void *_regmap_map_get_context(struct regmap *map)
+{
+	return (map->bus) ? map : map->bus_context;
+}
+
+int _regmap_write(struct regmap *map, unsigned int reg,
+		  unsigned int val)
+{
+	int ret;
+	void *context = _regmap_map_get_context(map);
+
+	if (!regmap_writeable(map, reg))
+		return -EIO;
+
+	if (!map->cache_bypass && !map->defer_caching) {
+		ret = regcache_write(map, reg, val);
+		if (ret != 0)
+			return ret;
+		if (map->cache_only) {
+			map->cache_dirty = true;
+			return 0;
+		}
+	}
+
+#ifdef LOG_DEVICE
+	if (map->dev && strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
+		dev_info(map->dev, "%x <= %x\n", reg, val);
+#endif
+
+	trace_regmap_reg_write(map, reg, val);
+
+	return map->reg_write(context, reg, val);
+}
+
+/**
+ * regmap_write(): Write a value to a single register
+ *
+ * @map: Register map to write to
+ * @reg: Register to write to
+ * @val: Value to be written
+ *
+ * A value of zero will be returned on success, a negative errno will
+ * be returned in error cases.
+ */
+int regmap_write(struct regmap *map, unsigned int reg, unsigned int val)
+{
+	int ret;
+
+	if (reg % map->reg_stride)
+		return -EINVAL;
+
+	map->lock(map->lock_arg);
+
+	ret = _regmap_write(map, reg, val);
+
+	map->unlock(map->lock_arg);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(regmap_write);
+
+/**
+ * regmap_write_async(): Write a value to a single register asynchronously
+ *
+ * @map: Register map to write to
+ * @reg: Register to write to
+ * @val: Value to be written
+ *
+ * A value of zero will be returned on success, a negative errno will
+ * be returned in error cases.
+ */
+int regmap_write_async(struct regmap *map, unsigned int reg, unsigned int val)
+{
+	int ret;
+
+	if (reg % map->reg_stride)
+		return -EINVAL;
+
+	map->lock(map->lock_arg);
+
+	map->async = true;
+
+	ret = _regmap_write(map, reg, val);
+
+	map->async = false;
+
+	map->unlock(map->lock_arg);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(regmap_write_async);
+
+/**
+ * regmap_raw_write(): Write raw values to one or more registers
+ *
+ * @map: Register map to write to
+ * @reg: Initial register to write to
+ * @val: Block of data to be written, laid out for direct transmission to the
+ *       device
+ * @val_len: Length of data pointed to by val.
+ *
+ * This function is intended to be used for things like firmware
+ * download where a large block of data needs to be transferred to the
+ * device.  No formatting will be done on the data provided.
+ *
+ * A value of zero will be returned on success, a negative errno will
+ * be returned in error cases.
+ */
+int regmap_raw_write(struct regmap *map, unsigned int reg,
+		     const void *val, size_t val_len)
+{
+	int ret;
+
+	if (!regmap_can_raw_write(map))
+		return -EINVAL;
+	if (val_len % map->format.val_bytes)
+		return -EINVAL;
+
+	map->lock(map->lock_arg);
+
+	ret = _regmap_raw_write(map, reg, val, val_len);
+
+	map->unlock(map->lock_arg);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(regmap_raw_write);
+
+/**
+ * regmap_field_write(): Write a value to a single register field
+ *
+ * @field: Register field to write to
+ * @val: Value to be written
+ *
+ * A value of zero will be returned on success, a negative errno will
+ * be returned in error cases.
+ */
+int regmap_field_write(struct regmap_field *field, unsigned int val)
+{
+	return regmap_update_bits(field->regmap, field->reg,
+				field->mask, val << field->shift);
+}
+EXPORT_SYMBOL_GPL(regmap_field_write);
+
+/**
+ * regmap_field_update_bits():	Perform a read/modify/write cycle
+ *                              on the register field
+ *
+ * @field: Register field to write to
+ * @mask: Bitmask to change
+ * @val: Value to be written
+ *
+ * A value of zero will be returned on success, a negative errno will
+ * be returned in error cases.
+ */
+int regmap_field_update_bits(struct regmap_field *field, unsigned int mask, unsigned int val)
+{
+	mask = (mask << field->shift) & field->mask;
+
+	return regmap_update_bits(field->regmap, field->reg,
+				  mask, val << field->shift);
+}
+EXPORT_SYMBOL_GPL(regmap_field_update_bits);
+
+/**
+ * regmap_fields_write(): Write a value to a single register field with port ID
+ *
+ * @field: Register field to write to
+ * @id: port ID
+ * @val: Value to be written
+ *
+ * A value of zero will be returned on success, a negative errno will
+ * be returned in error cases.
+ */
+int regmap_fields_write(struct regmap_field *field, unsigned int id,
+			unsigned int val)
+{
+	if (id >= field->id_size)
+		return -EINVAL;
+
+	return regmap_update_bits(field->regmap,
+				  field->reg + (field->id_offset * id),
+				  field->mask, val << field->shift);
+}
+EXPORT_SYMBOL_GPL(regmap_fields_write);
+
+/**
+ * regmap_fields_update_bits():	Perform a read/modify/write cycle
+ *                              on the register field
+ *
+ * @field: Register field to write to
+ * @id: port ID
+ * @mask: Bitmask to change
+ * @val: Value to be written
+ *
+ * A value of zero will be returned on success, a negative errno will
+ * be returned in error cases.
+ */
+int regmap_fields_update_bits(struct regmap_field *field,  unsigned int id,
+			      unsigned int mask, unsigned int val)
+{
+	if (id >= field->id_size)
+		return -EINVAL;
+
+	mask = (mask << field->shift) & field->mask;
+
+	return regmap_update_bits(field->regmap,
+				  field->reg + (field->id_offset * id),
+				  mask, val << field->shift);
+}
+EXPORT_SYMBOL_GPL(regmap_fields_update_bits);
+
+/*
+ * regmap_bulk_write(): Write multiple registers to the device
+ *
+ * @map: Register map to write to
+ * @reg: First register to be write from
+ * @val: Block of data to be written, in native register size for device
+ * @val_count: Number of registers to write
+ *
+ * This function is intended to be used for writing a large block of
+ * data to the device either in single transfer or multiple transfer.
+ *
+ * A value of zero will be returned on success, a negative errno will
+ * be returned in error cases.
+ */
+int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
+		     size_t val_count)
+{
+	int ret = 0, i;
+	size_t val_bytes = map->format.val_bytes;
+
+	if (map->bus && !map->format.parse_inplace)
+		return -EINVAL;
+	if (reg % map->reg_stride)
+		return -EINVAL;
+
+	/*
+	 * Some devices don't support bulk write, for
+	 * them we have a series of single write operations.
+	 */
+	if (!map->bus || map->use_single_rw) {
+		map->lock(map->lock_arg);
+		for (i = 0; i < val_count; i++) {
+			unsigned int ival;
+
+			switch (val_bytes) {
+			case 1:
+				ival = *(u8 *)(val + (i * val_bytes));
+				break;
+			case 2:
+				ival = *(u16 *)(val + (i * val_bytes));
+				break;
+			case 4:
+				ival = *(u32 *)(val + (i * val_bytes));
+				break;
+#ifdef CONFIG_64BIT
+			case 8:
+				ival = *(u64 *)(val + (i * val_bytes));
+				break;
+#endif
+			default:
+				ret = -EINVAL;
+				goto out;
+			}
+
+			ret = _regmap_write(map, reg + (i * map->reg_stride),
+					ival);
+			if (ret != 0)
+				goto out;
+		}
+out:
+		map->unlock(map->lock_arg);
+	} else {
+		void *wval;
+
+		if (!val_count)
+			return -EINVAL;
+
+		wval = kmemdup(val, val_count * val_bytes, GFP_KERNEL);
+		if (!wval) {
+			dev_err(map->dev, "Error in memory allocation\n");
+			return -ENOMEM;
+		}
+		for (i = 0; i < val_count * val_bytes; i += val_bytes)
+			map->format.parse_inplace(wval + i);
+
+		map->lock(map->lock_arg);
+		ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count);
+		map->unlock(map->lock_arg);
+
+		kfree(wval);
+	}
+	return ret;
+}
+EXPORT_SYMBOL_GPL(regmap_bulk_write);
+
+/*
+ * _regmap_raw_multi_reg_write()
+ *
+ * the (register,newvalue) pairs in regs have not been formatted, but
+ * they are all in the same page and have been changed to being page
+ * relative. The page register has been written if that was neccessary.
+ */
+static int _regmap_raw_multi_reg_write(struct regmap *map,
+				       const struct reg_default *regs,
+				       size_t num_regs)
+{
+	int ret;
+	void *buf;
+	int i;
+	u8 *u8;
+	size_t val_bytes = map->format.val_bytes;
+	size_t reg_bytes = map->format.reg_bytes;
+	size_t pad_bytes = map->format.pad_bytes;
+	size_t pair_size = reg_bytes + pad_bytes + val_bytes;
+	size_t len = pair_size * num_regs;
+
+	if (!len)
+		return -EINVAL;
+
+	buf = kzalloc(len, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	/* We have to linearise by hand. */
+
+	u8 = buf;
+
+	for (i = 0; i < num_regs; i++) {
+		int reg = regs[i].reg;
+		int val = regs[i].def;
+		trace_regmap_hw_write_start(map, reg, 1);
+		map->format.format_reg(u8, reg, map->reg_shift);
+		u8 += reg_bytes + pad_bytes;
+		map->format.format_val(u8, val, 0);
+		u8 += val_bytes;
+	}
+	u8 = buf;
+	*u8 |= map->write_flag_mask;
+
+	ret = map->bus->write(map->bus_context, buf, len);
+
+	kfree(buf);
+
+	for (i = 0; i < num_regs; i++) {
+		int reg = regs[i].reg;
+		trace_regmap_hw_write_done(map, reg, 1);
+	}
+	return ret;
+}
+
+static unsigned int _regmap_register_page(struct regmap *map,
+					  unsigned int reg,
+					  struct regmap_range_node *range)
+{
+	unsigned int win_page = (reg - range->range_min) / range->window_len;
+
+	return win_page;
+}
+
+static int _regmap_range_multi_paged_reg_write(struct regmap *map,
+					       struct reg_default *regs,
+					       size_t num_regs)
+{
+	int ret;
+	int i, n;
+	struct reg_default *base;
+	unsigned int this_page = 0;
+	/*
+	 * the set of registers are not neccessarily in order, but
+	 * since the order of write must be preserved this algorithm
+	 * chops the set each time the page changes
+	 */
+	base = regs;
+	for (i = 0, n = 0; i < num_regs; i++, n++) {
+		unsigned int reg = regs[i].reg;
+		struct regmap_range_node *range;
+
+		range = _regmap_range_lookup(map, reg);
+		if (range) {
+			unsigned int win_page = _regmap_register_page(map, reg,
+								      range);
+
+			if (i == 0)
+				this_page = win_page;
+			if (win_page != this_page) {
+				this_page = win_page;
+				ret = _regmap_raw_multi_reg_write(map, base, n);
+				if (ret != 0)
+					return ret;
+				base += n;
+				n = 0;
+			}
+			ret = _regmap_select_page(map, &base[n].reg, range, 1);
+			if (ret != 0)
+				return ret;
+		}
+	}
+	if (n > 0)
+		return _regmap_raw_multi_reg_write(map, base, n);
+	return 0;
+}
+
+static int _regmap_multi_reg_write(struct regmap *map,
+				   const struct reg_default *regs,
+				   size_t num_regs)
+{
+	int i;
+	int ret;
+
+	if (!map->can_multi_write) {
+		for (i = 0; i < num_regs; i++) {
+			ret = _regmap_write(map, regs[i].reg, regs[i].def);
+			if (ret != 0)
+				return ret;
+		}
+		return 0;
+	}
+
+	if (!map->format.parse_inplace)
+		return -EINVAL;
+
+	if (map->writeable_reg)
+		for (i = 0; i < num_regs; i++) {
+			int reg = regs[i].reg;
+			if (!map->writeable_reg(map->dev, reg))
+				return -EINVAL;
+			if (reg % map->reg_stride)
+				return -EINVAL;
+		}
+
+	if (!map->cache_bypass) {
+		for (i = 0; i < num_regs; i++) {
+			unsigned int val = regs[i].def;
+			unsigned int reg = regs[i].reg;
+			ret = regcache_write(map, reg, val);
+			if (ret) {
+				dev_err(map->dev,
+				"Error in caching of register: %x ret: %d\n",
+								reg, ret);
+				return ret;
+			}
+		}
+		if (map->cache_only) {
+			map->cache_dirty = true;
+			return 0;
+		}
+	}
+
+	WARN_ON(!map->bus);
+
+	for (i = 0; i < num_regs; i++) {
+		unsigned int reg = regs[i].reg;
+		struct regmap_range_node *range;
+		range = _regmap_range_lookup(map, reg);
+		if (range) {
+			size_t len = sizeof(struct reg_default)*num_regs;
+			struct reg_default *base = kmemdup(regs, len,
+							   GFP_KERNEL);
+			if (!base)
+				return -ENOMEM;
+			ret = _regmap_range_multi_paged_reg_write(map, base,
+								  num_regs);
+			kfree(base);
+
+			return ret;
+		}
+	}
+	return _regmap_raw_multi_reg_write(map, regs, num_regs);
+}
+
+/*
+ * regmap_multi_reg_write(): Write multiple registers to the device
+ *
+ * where the set of register,value pairs are supplied in any order,
+ * possibly not all in a single range.
+ *
+ * @map: Register map to write to
+ * @regs: Array of structures containing register,value to be written
+ * @num_regs: Number of registers to write
+ *
+ * The 'normal' block write mode will send ultimately send data on the
+ * target bus as R,V1,V2,V3,..,Vn where successively higer registers are
+ * addressed. However, this alternative block multi write mode will send
+ * the data as R1,V1,R2,V2,..,Rn,Vn on the target bus. The target device
+ * must of course support the mode.
+ *
+ * A value of zero will be returned on success, a negative errno will be
+ * returned in error cases.
+ */
+int regmap_multi_reg_write(struct regmap *map, const struct reg_default *regs,
+			   int num_regs)
+{
+	int ret;
+
+	map->lock(map->lock_arg);
+
+	ret = _regmap_multi_reg_write(map, regs, num_regs);
+
+	map->unlock(map->lock_arg);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(regmap_multi_reg_write);
+
+/*
+ * regmap_multi_reg_write_bypassed(): Write multiple registers to the
+ *                                    device but not the cache
+ *
+ * where the set of register are supplied in any order
+ *
+ * @map: Register map to write to
+ * @regs: Array of structures containing register,value to be written
+ * @num_regs: Number of registers to write
+ *
+ * This function is intended to be used for writing a large block of data
+ * atomically to the device in single transfer for those I2C client devices
+ * that implement this alternative block write mode.
+ *
+ * A value of zero will be returned on success, a negative errno will
+ * be returned in error cases.
+ */
+int regmap_multi_reg_write_bypassed(struct regmap *map,
+				    const struct reg_default *regs,
+				    int num_regs)
+{
+	int ret;
+	bool bypass;
+
+	map->lock(map->lock_arg);
+
+	bypass = map->cache_bypass;
+	map->cache_bypass = true;
+
+	ret = _regmap_multi_reg_write(map, regs, num_regs);
+
+	map->cache_bypass = bypass;
+
+	map->unlock(map->lock_arg);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(regmap_multi_reg_write_bypassed);
+
+/**
+ * regmap_raw_write_async(): Write raw values to one or more registers
+ *                           asynchronously
+ *
+ * @map: Register map to write to
+ * @reg: Initial register to write to
+ * @val: Block of data to be written, laid out for direct transmission to the
+ *       device.  Must be valid until regmap_async_complete() is called.
+ * @val_len: Length of data pointed to by val.
+ *
+ * This function is intended to be used for things like firmware
+ * download where a large block of data needs to be transferred to the
+ * device.  No formatting will be done on the data provided.
+ *
+ * If supported by the underlying bus the write will be scheduled
+ * asynchronously, helping maximise I/O speed on higher speed buses
+ * like SPI.  regmap_async_complete() can be called to ensure that all
+ * asynchrnous writes have been completed.
+ *
+ * A value of zero will be returned on success, a negative errno will
+ * be returned in error cases.
+ */
+int regmap_raw_write_async(struct regmap *map, unsigned int reg,
+			   const void *val, size_t val_len)
+{
+	int ret;
+
+	if (val_len % map->format.val_bytes)
+		return -EINVAL;
+	if (reg % map->reg_stride)
+		return -EINVAL;
+
+	map->lock(map->lock_arg);
+
+	map->async = true;
+
+	ret = _regmap_raw_write(map, reg, val, val_len);
+
+	map->async = false;
+
+	map->unlock(map->lock_arg);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(regmap_raw_write_async);
+
+static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
+			    unsigned int val_len)
+{
+	struct regmap_range_node *range;
+	u8 *u8 = map->work_buf;
+	int ret;
+
+	WARN_ON(!map->bus);
+
+	range = _regmap_range_lookup(map, reg);
+	if (range) {
+		ret = _regmap_select_page(map, &reg, range,
+					  val_len / map->format.val_bytes);
+		if (ret != 0)
+			return ret;
+	}
+
+	map->format.format_reg(map->work_buf, reg, map->reg_shift);
+
+	/*
+	 * Some buses or devices flag reads by setting the high bits in the
+	 * register addresss; since it's always the high bits for all
+	 * current formats we can do this here rather than in
+	 * formatting.  This may break if we get interesting formats.
+	 */
+	u8[0] |= map->read_flag_mask;
+
+	trace_regmap_hw_read_start(map, reg, val_len / map->format.val_bytes);
+
+	ret = map->bus->read(map->bus_context, map->work_buf,
+			     map->format.reg_bytes + map->format.pad_bytes,
+			     val, val_len);
+
+	trace_regmap_hw_read_done(map, reg, val_len / map->format.val_bytes);
+
+	return ret;
+}
+
+static int _regmap_bus_reg_read(void *context, unsigned int reg,
+				unsigned int *val)
+{
+	struct regmap *map = context;
+
+	return map->bus->reg_read(map->bus_context, reg, val);
+}
+
+static int _regmap_bus_read(void *context, unsigned int reg,
+			    unsigned int *val)
+{
+	int ret;
+	struct regmap *map = context;
+
+	if (!map->format.parse_val)
+		return -EINVAL;
+
+	ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes);
+	if (ret == 0)
+		*val = map->format.parse_val(map->work_buf);
+
+	return ret;
+}
+
+static int _regmap_read(struct regmap *map, unsigned int reg,
+			unsigned int *val)
+{
+	int ret;
+	void *context = _regmap_map_get_context(map);
+
+	WARN_ON(!map->reg_read);
+
+	if (!map->cache_bypass) {
+		ret = regcache_read(map, reg, val);
+		if (ret == 0)
+			return 0;
+	}
+
+	if (map->cache_only)
+		return -EBUSY;
+
+	if (!regmap_readable(map, reg))
+		return -EIO;
+
+	ret = map->reg_read(context, reg, val);
+	if (ret == 0) {
+#ifdef LOG_DEVICE
+		if (map->dev && strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
+			dev_info(map->dev, "%x => %x\n", reg, *val);
+#endif
+
+		trace_regmap_reg_read(map, reg, *val);
+
+		if (!map->cache_bypass)
+			regcache_write(map, reg, *val);
+	}
+
+	return ret;
+}
+
+/**
+ * regmap_read(): Read a value from a single register
+ *
+ * @map: Register map to read from
+ * @reg: Register to be read from
+ * @val: Pointer to store read value
+ *
+ * A value of zero will be returned on success, a negative errno will
+ * be returned in error cases.
+ */
+int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val)
+{
+	int ret;
+
+	if (reg % map->reg_stride)
+		return -EINVAL;
+
+	map->lock(map->lock_arg);
+
+	ret = _regmap_read(map, reg, val);
+
+	map->unlock(map->lock_arg);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(regmap_read);
+
+/**
+ * regmap_raw_read(): Read raw data from the device
+ *
+ * @map: Register map to read from
+ * @reg: First register to be read from
+ * @val: Pointer to store read value
+ * @val_len: Size of data to read
+ *
+ * A value of zero will be returned on success, a negative errno will
+ * be returned in error cases.
+ */
+int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
+		    size_t val_len)
+{
+	size_t val_bytes = map->format.val_bytes;
+	size_t val_count = val_len / val_bytes;
+	unsigned int v;
+	int ret, i;
+
+	if (!map->bus)
+		return -EINVAL;
+	if (val_len % map->format.val_bytes)
+		return -EINVAL;
+	if (reg % map->reg_stride)
+		return -EINVAL;
+
+	map->lock(map->lock_arg);
+
+	if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass ||
+	    map->cache_type == REGCACHE_NONE) {
+		/* Physical block read if there's no cache involved */
+		ret = _regmap_raw_read(map, reg, val, val_len);
+
+	} else {
+		/* Otherwise go word by word for the cache; should be low
+		 * cost as we expect to hit the cache.
+		 */
+		for (i = 0; i < val_count; i++) {
+			ret = _regmap_read(map, reg + (i * map->reg_stride),
+					   &v);
+			if (ret != 0)
+				goto out;
+
+			map->format.format_val(val + (i * val_bytes), v, 0);
+		}
+	}
+
+ out:
+	map->unlock(map->lock_arg);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(regmap_raw_read);
+
+/**
+ * regmap_field_read(): Read a value to a single register field
+ *
+ * @field: Register field to read from
+ * @val: Pointer to store read value
+ *
+ * A value of zero will be returned on success, a negative errno will
+ * be returned in error cases.
+ */
+int regmap_field_read(struct regmap_field *field, unsigned int *val)
+{
+	int ret;
+	unsigned int reg_val;
+	ret = regmap_read(field->regmap, field->reg, &reg_val);
+	if (ret != 0)
+		return ret;
+
+	reg_val &= field->mask;
+	reg_val >>= field->shift;
+	*val = reg_val;
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(regmap_field_read);
+
+/**
+ * regmap_fields_read(): Read a value to a single register field with port ID
+ *
+ * @field: Register field to read from
+ * @id: port ID
+ * @val: Pointer to store read value
+ *
+ * A value of zero will be returned on success, a negative errno will
+ * be returned in error cases.
+ */
+int regmap_fields_read(struct regmap_field *field, unsigned int id,
+		       unsigned int *val)
+{
+	int ret;
+	unsigned int reg_val;
+
+	if (id >= field->id_size)
+		return -EINVAL;
+
+	ret = regmap_read(field->regmap,
+			  field->reg + (field->id_offset * id),
+			  &reg_val);
+	if (ret != 0)
+		return ret;
+
+	reg_val &= field->mask;
+	reg_val >>= field->shift;
+	*val = reg_val;
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(regmap_fields_read);
+
+/**
+ * regmap_bulk_read(): Read multiple registers from the device
+ *
+ * @map: Register map to read from
+ * @reg: First register to be read from
+ * @val: Pointer to store read value, in native register size for device
+ * @val_count: Number of registers to read
+ *
+ * A value of zero will be returned on success, a negative errno will
+ * be returned in error cases.
+ */
+int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
+		     size_t val_count)
+{
+	int ret, i;
+	size_t val_bytes = map->format.val_bytes;
+	bool vol = regmap_volatile_range(map, reg, val_count);
+
+	if (reg % map->reg_stride)
+		return -EINVAL;
+
+	if (map->bus && map->format.parse_inplace && (vol || map->cache_type == REGCACHE_NONE)) {
+		/*
+		 * Some devices does not support bulk read, for
+		 * them we have a series of single read operations.
+		 */
+		if (map->use_single_rw) {
+			for (i = 0; i < val_count; i++) {
+				ret = regmap_raw_read(map,
+						reg + (i * map->reg_stride),
+						val + (i * val_bytes),
+						val_bytes);
+				if (ret != 0)
+					return ret;
+			}
+		} else {
+			ret = regmap_raw_read(map, reg, val,
+					      val_bytes * val_count);
+			if (ret != 0)
+				return ret;
+		}
+
+		for (i = 0; i < val_count * val_bytes; i += val_bytes)
+			map->format.parse_inplace(val + i);
+	} else {
+		for (i = 0; i < val_count; i++) {
+			unsigned int ival;
+			ret = regmap_read(map, reg + (i * map->reg_stride),
+					  &ival);
+			if (ret != 0)
+				return ret;
+			map->format.format_val(val + (i * val_bytes), ival, 0);
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(regmap_bulk_read);
+
+static int _regmap_update_bits(struct regmap *map, unsigned int reg,
+			       unsigned int mask, unsigned int val,
+			       bool *change)
+{
+	int ret;
+	unsigned int tmp, orig;
+
+	ret = _regmap_read(map, reg, &orig);
+	if (ret != 0)
+		return ret;
+
+	tmp = orig & ~mask;
+	tmp |= val & mask;
+
+	if (tmp != orig) {
+		ret = _regmap_write(map, reg, tmp);
+		if (change)
+			*change = true;
+	} else {
+		if (change)
+			*change = false;
+	}
+
+	return ret;
+}
+
+/**
+ * regmap_update_bits: Perform a read/modify/write cycle on the register map
+ *
+ * @map: Register map to update
+ * @reg: Register to update
+ * @mask: Bitmask to change
+ * @val: New value for bitmask
+ *
+ * Returns zero for success, a negative number on error.
+ */
+int regmap_update_bits(struct regmap *map, unsigned int reg,
+		       unsigned int mask, unsigned int val)
+{
+	int ret;
+
+	map->lock(map->lock_arg);
+	ret = _regmap_update_bits(map, reg, mask, val, NULL);
+	map->unlock(map->lock_arg);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(regmap_update_bits);
+
+/**
+ * regmap_update_bits_async: Perform a read/modify/write cycle on the register
+ *                           map asynchronously
+ *
+ * @map: Register map to update
+ * @reg: Register to update
+ * @mask: Bitmask to change
+ * @val: New value for bitmask
+ *
+ * With most buses the read must be done synchronously so this is most
+ * useful for devices with a cache which do not need to interact with
+ * the hardware to determine the current register value.
+ *
+ * Returns zero for success, a negative number on error.
+ */
+int regmap_update_bits_async(struct regmap *map, unsigned int reg,
+			     unsigned int mask, unsigned int val)
+{
+	int ret;
+
+	map->lock(map->lock_arg);
+
+	map->async = true;
+
+	ret = _regmap_update_bits(map, reg, mask, val, NULL);
+
+	map->async = false;
+
+	map->unlock(map->lock_arg);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(regmap_update_bits_async);
+
+/**
+ * regmap_update_bits_check: Perform a read/modify/write cycle on the
+ *                           register map and report if updated
+ *
+ * @map: Register map to update
+ * @reg: Register to update
+ * @mask: Bitmask to change
+ * @val: New value for bitmask
+ * @change: Boolean indicating if a write was done
+ *
+ * Returns zero for success, a negative number on error.
+ */
+int regmap_update_bits_check(struct regmap *map, unsigned int reg,
+			     unsigned int mask, unsigned int val,
+			     bool *change)
+{
+	int ret;
+
+	map->lock(map->lock_arg);
+	ret = _regmap_update_bits(map, reg, mask, val, change);
+	map->unlock(map->lock_arg);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(regmap_update_bits_check);
+
+/**
+ * regmap_update_bits_check_async: Perform a read/modify/write cycle on the
+ *                                 register map asynchronously and report if
+ *                                 updated
+ *
+ * @map: Register map to update
+ * @reg: Register to update
+ * @mask: Bitmask to change
+ * @val: New value for bitmask
+ * @change: Boolean indicating if a write was done
+ *
+ * With most buses the read must be done synchronously so this is most
+ * useful for devices with a cache which do not need to interact with
+ * the hardware to determine the current register value.
+ *
+ * Returns zero for success, a negative number on error.
+ */
+int regmap_update_bits_check_async(struct regmap *map, unsigned int reg,
+				   unsigned int mask, unsigned int val,
+				   bool *change)
+{
+	int ret;
+
+	map->lock(map->lock_arg);
+
+	map->async = true;
+
+	ret = _regmap_update_bits(map, reg, mask, val, change);
+
+	map->async = false;
+
+	map->unlock(map->lock_arg);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(regmap_update_bits_check_async);
+
+void regmap_async_complete_cb(struct regmap_async *async, int ret)
+{
+	struct regmap *map = async->map;
+	bool wake;
+
+	trace_regmap_async_io_complete(map);
+
+	spin_lock(&map->async_lock);
+	list_move(&async->list, &map->async_free);
+	wake = list_empty(&map->async_list);
+
+	if (ret != 0)
+		map->async_ret = ret;
+
+	spin_unlock(&map->async_lock);
+
+	if (wake)
+		wake_up(&map->async_waitq);
+}
+EXPORT_SYMBOL_GPL(regmap_async_complete_cb);
+
+static int regmap_async_is_done(struct regmap *map)
+{
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&map->async_lock, flags);
+	ret = list_empty(&map->async_list);
+	spin_unlock_irqrestore(&map->async_lock, flags);
+
+	return ret;
+}
+
+/**
+ * regmap_async_complete: Ensure all asynchronous I/O has completed.
+ *
+ * @map: Map to operate on.
+ *
+ * Blocks until any pending asynchronous I/O has completed.  Returns
+ * an error code for any failed I/O operations.
+ */
+int regmap_async_complete(struct regmap *map)
+{
+	unsigned long flags;
+	int ret;
+
+	/* Nothing to do with no async support */
+	if (!map->bus || !map->bus->async_write)
+		return 0;
+
+	trace_regmap_async_complete_start(map);
+
+	wait_event(map->async_waitq, regmap_async_is_done(map));
+
+	spin_lock_irqsave(&map->async_lock, flags);
+	ret = map->async_ret;
+	map->async_ret = 0;
+	spin_unlock_irqrestore(&map->async_lock, flags);
+
+	trace_regmap_async_complete_done(map);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(regmap_async_complete);
+
+/**
+ * regmap_register_patch: Register and apply register updates to be applied
+ *                        on device initialistion
+ *
+ * @map: Register map to apply updates to.
+ * @regs: Values to update.
+ * @num_regs: Number of entries in regs.
+ *
+ * Register a set of register updates to be applied to the device
+ * whenever the device registers are synchronised with the cache and
+ * apply them immediately.  Typically this is used to apply
+ * corrections to be applied to the device defaults on startup, such
+ * as the updates some vendors provide to undocumented registers.
+ *
+ * The caller must ensure that this function cannot be called
+ * concurrently with either itself or regcache_sync().
+ */
+int regmap_register_patch(struct regmap *map, const struct reg_default *regs,
+			  int num_regs)
+{
+	struct reg_default *p;
+	int ret;
+	bool bypass;
+
+	if (WARN_ONCE(num_regs <= 0, "invalid registers number (%d)\n",
+	    num_regs))
+		return 0;
+
+	p = krealloc(map->patch,
+		     sizeof(struct reg_default) * (map->patch_regs + num_regs),
+		     GFP_KERNEL);
+	if (p) {
+		memcpy(p + map->patch_regs, regs, num_regs * sizeof(*regs));
+		map->patch = p;
+		map->patch_regs += num_regs;
+	} else {
+		return -ENOMEM;
+	}
+
+	map->lock(map->lock_arg);
+
+	bypass = map->cache_bypass;
+
+	map->cache_bypass = true;
+	map->async = true;
+
+	ret = _regmap_multi_reg_write(map, regs, num_regs);
+	if (ret != 0)
+		goto out;
+
+out:
+	map->async = false;
+	map->cache_bypass = bypass;
+
+	map->unlock(map->lock_arg);
+
+	regmap_async_complete(map);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(regmap_register_patch);
+
+/*
+ * regmap_get_val_bytes(): Report the size of a register value
+ *
+ * Report the size of a register value, mainly intended to for use by
+ * generic infrastructure built on top of regmap.
+ */
+int regmap_get_val_bytes(struct regmap *map)
+{
+	if (map->format.format_write)
+		return -EINVAL;
+
+	return map->format.val_bytes;
+}
+EXPORT_SYMBOL_GPL(regmap_get_val_bytes);
+
+int regmap_parse_val(struct regmap *map, const void *buf,
+			unsigned int *val)
+{
+	if (!map->format.parse_val)
+		return -EINVAL;
+
+	*val = map->format.parse_val(buf);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(regmap_parse_val);
+
+static int __init regmap_initcall(void)
+{
+	regmap_debugfs_initcall();
+
+	return 0;
+}
+postcore_initcall(regmap_initcall);