diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-st.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-st.txt
new file mode 100644
index 000000000000..05bf82a07dfd
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-st.txt
@@ -0,0 +1,110 @@
+*ST pin controller.
+
+Each multi-function pin is controlled, driven and routed through the
+PIO multiplexing block. Each pin supports GPIO functionality (ALT0)
+and multiple alternate functions(ALT1 - ALTx) that directly connect
+the pin to different hardware blocks.
+
+When a pin is in GPIO mode, Output Enable (OE), Open Drain(OD), and
+Pull Up (PU) are driven by the related PIO block.
+
+ST pinctrl driver controls PIO multiplexing block and also interacts with
+gpio driver to configure a pin.
+
+Required properties: (PIO multiplexing block)
+- compatible	: should be "st,<SOC>-<pio-block>-pinctrl"
+	like st,stih415-sbc-pinctrl, st,stih415-front-pinctrl and so on.
+- gpio-controller : Indicates this device is a GPIO controller
+- #gpio-cells	  : Should be one. The first cell is the pin number.
+- st,retime-pin-mask	: Should be mask to specify which pins can be retimed.
+	If the property is not present, it is assumed that all the pins in the
+	bank are capable of retiming. Retiming is mainly used to improve the
+	IO timing margins of external synchronous interfaces.
+- st,bank-name		: Should be a name string for this bank as
+			specified in datasheet.
+- st,syscfg		: Should be a phandle of the syscfg node.
+
+Example:
+	pin-controller-sbc {
+		#address-cells	= <1>;
+		#size-cells	= <1>;
+		compatible	= "st,stih415-sbc-pinctrl";
+		st,syscfg	= <&syscfg_sbc>;
+		ranges 		= <0 0xfe610000 0x5000>;
+		PIO0: gpio@fe610000 {
+			gpio-controller;
+			#gpio-cells	= <1>;
+			reg		= <0 0x100>;
+			st,bank-name	= "PIO0";
+		};
+		...
+		pin-functions nodes follow...
+	};
+
+
+Contents of function subnode node:
+----------------------
+Required properties for pin configuration node:
+- st,pins	: Child node with list of pins with configuration.
+
+Below is the format of how each pin conf should look like.
+
+<bank offset mux mode rt_type rt_delay rt_clk>
+
+Every PIO is represented with 4-7 parameters depending on retime configuration.
+Each parameter is explained as below.
+
+-bank		: Should be bank phandle to which this PIO belongs.
+-offset		: Offset in the PIO bank.
+-mux		: Should be alternate function number associated this pin.
+		Use same numbers from datasheet.
+-mode		:pin configuration is selected from one of the below values.
+		IN
+		IN_PU
+		OUT
+		BIDIR
+		BIDIR_PU
+
+-rt_type	Retiming Configuration for the pin.
+		Possible retime configuration are:
+
+		-------		-------------
+		value		args
+		-------		-------------
+		NICLK		<delay> <clk>
+		ICLK_IO		<delay> <clk>
+		BYPASS		<delay>
+		DE_IO		<delay> <clk>
+		SE_ICLK_IO	<delay> <clk>
+		SE_NICLK_IO	<delay> <clk>
+
+- delay	is retime delay in pico seconds as mentioned in data sheet.
+
+- rt_clk	:clk to be use for retime.
+		Possible values are:
+		CLK_A
+		CLK_B
+		CLK_C
+		CLK_D
+
+Example of mmcclk pin which is a bi-direction pull pu with retime config
+as non inverted clock retimed with CLK_B and delay of 0 pico seconds:
+
+pin-controller {
+	...
+	mmc0 {
+		pinctrl_mmc: mmc {
+			st,pins {
+				mmcclk = <&PIO13 4 ALT4 BIDIR_PU NICLK 0 CLK_B>;
+				...
+			};
+		};
+	...
+	};
+};
+
+sdhci0:sdhci@fe810000{
+	...
+	pinctrl-names = "default";
+	pinctrl-0	= <&pinctrl_mmc>;
+};
diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h
index c130536e0ab0..29c83160ca29 100644
--- a/drivers/base/regmap/internal.h
+++ b/drivers/base/regmap/internal.h
@@ -52,6 +52,7 @@ struct regmap_async {
 struct regmap {
 	struct mutex mutex;
 	spinlock_t spinlock;
+	unsigned long spinlock_flags;
 	regmap_lock lock;
 	regmap_unlock unlock;
 	void *lock_arg; /* This is passed to lock/unlock functions */
@@ -148,6 +149,7 @@ struct regcache_ops {
 	int (*read)(struct regmap *map, unsigned int reg, unsigned int *value);
 	int (*write)(struct regmap *map, unsigned int reg, unsigned int value);
 	int (*sync)(struct regmap *map, unsigned int min, unsigned int max);
+	int (*drop)(struct regmap *map, unsigned int min, unsigned int max);
 };
 
 bool regmap_writeable(struct regmap *map, unsigned int reg);
@@ -174,6 +176,14 @@ struct regmap_range_node {
 	unsigned int window_len;
 };
 
+struct regmap_field {
+	struct regmap *regmap;
+	unsigned int mask;
+	/* lsb */
+	unsigned int shift;
+	unsigned int reg;
+};
+
 #ifdef CONFIG_DEBUG_FS
 extern void regmap_debugfs_initcall(void);
 extern void regmap_debugfs_init(struct regmap *map, const char *name);
diff --git a/drivers/base/regmap/regcache-rbtree.c b/drivers/base/regmap/regcache-rbtree.c
index 02f490bad30f..5c1435c4e210 100644
--- a/drivers/base/regmap/regcache-rbtree.c
+++ b/drivers/base/regmap/regcache-rbtree.c
@@ -304,6 +304,48 @@ static int regcache_rbtree_insert_to_block(struct regmap *map,
 	return 0;
 }
 
+static struct regcache_rbtree_node *
+regcache_rbtree_node_alloc(struct regmap *map, unsigned int reg)
+{
+	struct regcache_rbtree_node *rbnode;
+	const struct regmap_range *range;
+	int i;
+
+	rbnode = kzalloc(sizeof(*rbnode), GFP_KERNEL);
+	if (!rbnode)
+		return NULL;
+
+	/* If there is a read table then use it to guess at an allocation */
+	if (map->rd_table) {
+		for (i = 0; i < map->rd_table->n_yes_ranges; i++) {
+			if (regmap_reg_in_range(reg,
+						&map->rd_table->yes_ranges[i]))
+				break;
+		}
+
+		if (i != map->rd_table->n_yes_ranges) {
+			range = &map->rd_table->yes_ranges[i];
+			rbnode->blklen = range->range_max - range->range_min
+				+ 1;
+			rbnode->base_reg = range->range_min;
+		}
+	}
+
+	if (!rbnode->blklen) {
+		rbnode->blklen = sizeof(*rbnode);
+		rbnode->base_reg = reg;
+	}
+
+	rbnode->block = kmalloc(rbnode->blklen * map->cache_word_size,
+				GFP_KERNEL);
+	if (!rbnode->block) {
+		kfree(rbnode);
+		return NULL;
+	}
+
+	return rbnode;
+}
+
 static int regcache_rbtree_write(struct regmap *map, unsigned int reg,
 				 unsigned int value)
 {
@@ -354,23 +396,15 @@ static int regcache_rbtree_write(struct regmap *map, unsigned int reg,
 				return 0;
 			}
 		}
-		/* we did not manage to find a place to insert it in an existing
-		 * block so create a new rbnode with a single register in its block.
-		 * This block will get populated further if any other adjacent
-		 * registers get modified in the future.
+
+		/* We did not manage to find a place to insert it in
+		 * an existing block so create a new rbnode.
 		 */
-		rbnode = kzalloc(sizeof *rbnode, GFP_KERNEL);
+		rbnode = regcache_rbtree_node_alloc(map, reg);
 		if (!rbnode)
 			return -ENOMEM;
-		rbnode->blklen = sizeof(*rbnode);
-		rbnode->base_reg = reg;
-		rbnode->block = kmalloc(rbnode->blklen * map->cache_word_size,
-					GFP_KERNEL);
-		if (!rbnode->block) {
-			kfree(rbnode);
-			return -ENOMEM;
-		}
-		regcache_rbtree_set_register(map, rbnode, 0, value);
+		regcache_rbtree_set_register(map, rbnode,
+					     reg - rbnode->base_reg, value);
 		regcache_rbtree_insert(map, &rbtree_ctx->root, rbnode);
 		rbtree_ctx->cached_rbnode = rbnode;
 	}
diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c
index 507ee2da0f6e..e69102696533 100644
--- a/drivers/base/regmap/regcache.c
+++ b/drivers/base/regmap/regcache.c
@@ -250,6 +250,38 @@ int regcache_write(struct regmap *map,
 	return 0;
 }
 
+static int regcache_default_sync(struct regmap *map, unsigned int min,
+				 unsigned int max)
+{
+	unsigned int reg;
+
+	for (reg = min; reg <= max; reg++) {
+		unsigned int val;
+		int ret;
+
+		if (regmap_volatile(map, reg))
+			continue;
+
+		ret = regcache_read(map, reg, &val);
+		if (ret)
+			return ret;
+
+		/* Is this the hardware default?  If so skip. */
+		ret = regcache_lookup_reg(map, reg);
+		if (ret >= 0 && val == map->reg_defaults[ret].def)
+			continue;
+
+		map->cache_bypass = 1;
+		ret = _regmap_write(map, reg, val);
+		map->cache_bypass = 0;
+		if (ret)
+			return ret;
+		dev_dbg(map->dev, "Synced register %#x, value %#x\n", reg, val);
+	}
+
+	return 0;
+}
+
 /**
  * regcache_sync: Sync the register cache with the hardware.
  *
@@ -268,7 +300,7 @@ int regcache_sync(struct regmap *map)
 	const char *name;
 	unsigned int bypass;
 
-	BUG_ON(!map->cache_ops || !map->cache_ops->sync);
+	BUG_ON(!map->cache_ops);
 
 	map->lock(map->lock_arg);
 	/* Remember the initial bypass state */
@@ -297,7 +329,10 @@ int regcache_sync(struct regmap *map)
 	}
 	map->cache_bypass = 0;
 
-	ret = map->cache_ops->sync(map, 0, map->max_register);
+	if (map->cache_ops->sync)
+		ret = map->cache_ops->sync(map, 0, map->max_register);
+	else
+		ret = regcache_default_sync(map, 0, map->max_register);
 
 	if (ret == 0)
 		map->cache_dirty = false;
@@ -331,7 +366,7 @@ int regcache_sync_region(struct regmap *map, unsigned int min,
 	const char *name;
 	unsigned int bypass;
 
-	BUG_ON(!map->cache_ops || !map->cache_ops->sync);
+	BUG_ON(!map->cache_ops);
 
 	map->lock(map->lock_arg);
 
@@ -346,7 +381,10 @@ int regcache_sync_region(struct regmap *map, unsigned int min,
 	if (!map->cache_dirty)
 		goto out;
 
-	ret = map->cache_ops->sync(map, min, max);
+	if (map->cache_ops->sync)
+		ret = map->cache_ops->sync(map, min, max);
+	else
+		ret = regcache_default_sync(map, min, max);
 
 out:
 	trace_regcache_sync(map->dev, name, "stop region");
@@ -358,6 +396,43 @@ int regcache_sync_region(struct regmap *map, unsigned int min,
 }
 EXPORT_SYMBOL_GPL(regcache_sync_region);
 
+/**
+ * regcache_drop_region: Discard part of the register cache
+ *
+ * @map: map to operate on
+ * @min: first register to discard
+ * @max: last register to discard
+ *
+ * Discard part of the register cache.
+ *
+ * Return a negative value on failure, 0 on success.
+ */
+int regcache_drop_region(struct regmap *map, unsigned int min,
+			 unsigned int max)
+{
+	unsigned int reg;
+	int ret = 0;
+
+	if (!map->cache_present && !(map->cache_ops && map->cache_ops->drop))
+		return -EINVAL;
+
+	map->lock(map->lock_arg);
+
+	trace_regcache_drop_region(map->dev, min, max);
+
+	if (map->cache_present)
+		for (reg = min; reg < max + 1; reg++)
+			clear_bit(reg, map->cache_present);
+
+	if (map->cache_ops && map->cache_ops->drop)
+		ret = map->cache_ops->drop(map, min, max);
+
+	map->unlock(map->lock_arg);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(regcache_drop_region);
+
 /**
  * regcache_cache_only: Put a register map into cache only mode
  *
diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index 975719bc3450..53495753fbdb 100644
--- a/drivers/base/regmap/regmap-debugfs.c
+++ b/drivers/base/regmap/regmap-debugfs.c
@@ -84,6 +84,10 @@ static unsigned int regmap_debugfs_get_dump_start(struct regmap *map,
 	unsigned int fpos_offset;
 	unsigned int reg_offset;
 
+	/* Suppress the cache if we're using a subrange */
+	if (from)
+		return from;
+
 	/*
 	 * If we don't have a cache build one so we don't have to do a
 	 * linear scan each time.
@@ -145,7 +149,7 @@ static unsigned int regmap_debugfs_get_dump_start(struct regmap *map,
 			reg_offset = fpos_offset / map->debugfs_tot_len;
 			*pos = c->min + (reg_offset * map->debugfs_tot_len);
 			mutex_unlock(&map->cache_lock);
-			return c->base_reg + reg_offset;
+			return c->base_reg + (reg_offset * map->reg_stride);
 		}
 
 		*pos = c->max;
@@ -281,7 +285,7 @@ static ssize_t regmap_map_write_file(struct file *file,
 		return -EINVAL;
 
 	/* Userspace has been fiddling around behind the kernel's back */
-	add_taint(TAINT_USER, LOCKDEP_NOW_UNRELIABLE);
+	add_taint(TAINT_USER, LOCKDEP_STILL_OK);
 
 	ret = regmap_write(map, reg, value);
 	if (ret < 0)
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index a941dcfe7590..95920583e31e 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -65,9 +65,8 @@ bool regmap_reg_in_ranges(unsigned int reg,
 }
 EXPORT_SYMBOL_GPL(regmap_reg_in_ranges);
 
-static bool _regmap_check_range_table(struct regmap *map,
-				      unsigned int reg,
-				      const struct regmap_access_table *table)
+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))
@@ -80,6 +79,7 @@ static bool _regmap_check_range_table(struct regmap *map,
 	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)
 {
@@ -90,7 +90,7 @@ bool regmap_writeable(struct regmap *map, unsigned int reg)
 		return map->writeable_reg(map->dev, reg);
 
 	if (map->wr_table)
-		return _regmap_check_range_table(map, reg, map->wr_table);
+		return regmap_check_range_table(map, reg, map->wr_table);
 
 	return true;
 }
@@ -107,7 +107,7 @@ bool regmap_readable(struct regmap *map, unsigned int reg)
 		return map->readable_reg(map->dev, reg);
 
 	if (map->rd_table)
-		return _regmap_check_range_table(map, reg, map->rd_table);
+		return regmap_check_range_table(map, reg, map->rd_table);
 
 	return true;
 }
@@ -121,9 +121,12 @@ bool regmap_volatile(struct regmap *map, unsigned int reg)
 		return map->volatile_reg(map->dev, reg);
 
 	if (map->volatile_table)
-		return _regmap_check_range_table(map, reg, map->volatile_table);
+		return regmap_check_range_table(map, reg, map->volatile_table);
 
-	return true;
+	if (map->cache_ops)
+		return false;
+	else
+		return true;
 }
 
 bool regmap_precious(struct regmap *map, unsigned int reg)
@@ -135,7 +138,7 @@ bool regmap_precious(struct regmap *map, unsigned int reg)
 		return map->precious_reg(map->dev, reg);
 
 	if (map->precious_table)
-		return _regmap_check_range_table(map, reg, map->precious_table);
+		return regmap_check_range_table(map, reg, map->precious_table);
 
 	return false;
 }
@@ -302,13 +305,16 @@ static void regmap_unlock_mutex(void *__map)
 static void regmap_lock_spinlock(void *__map)
 {
 	struct regmap *map = __map;
-	spin_lock(&map->spinlock);
+	unsigned long flags;
+
+	spin_lock_irqsave(&map->spinlock, flags);
+	map->spinlock_flags = flags;
 }
 
 static void regmap_unlock_spinlock(void *__map)
 {
 	struct regmap *map = __map;
-	spin_unlock(&map->spinlock);
+	spin_unlock_irqrestore(&map->spinlock, map->spinlock_flags);
 }
 
 static void dev_get_regmap_release(struct device *dev, void *res)
@@ -801,6 +807,95 @@ struct regmap *devm_regmap_init(struct device *dev,
 }
 EXPORT_SYMBOL_GPL(devm_regmap_init);
 
+static void regmap_field_init(struct regmap_field *rm_field,
+	struct regmap *regmap, struct reg_field reg_field)
+{
+	int field_bits = reg_field.msb - reg_field.lsb + 1;
+	rm_field->regmap = regmap;
+	rm_field->reg = reg_field.reg;
+	rm_field->shift = reg_field.lsb;
+	rm_field->mask = ((BIT(field_bits) - 1) << reg_field.lsb);
+}
+
+/**
+ * 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
  *
@@ -1249,6 +1344,22 @@ int regmap_raw_write(struct regmap *map, unsigned int reg,
 }
 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_bulk_write(): Write multiple registers to the device
  *
@@ -1531,6 +1642,31 @@ int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
 }
 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_bulk_read(): Read multiple registers from the device
  *
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 901a388dbea7..19396c8ffe45 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -169,6 +169,12 @@ config PINCTRL_SUNXI
 	select PINMUX
 	select GENERIC_PINCONF
 
+config PINCTRL_ST
+	bool
+	depends on OF
+	select PINMUX
+	select PINCONF
+
 config PINCTRL_TEGRA
 	bool
 	select PINMUX
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index f90b645fb601..76c937cbbb13 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -46,6 +46,7 @@ obj-$(CONFIG_PINCTRL_S3C24XX)	+= pinctrl-s3c24xx.o
 obj-$(CONFIG_PINCTRL_S3C64XX)	+= pinctrl-s3c64xx.o
 obj-$(CONFIG_PINCTRL_XWAY)	+= pinctrl-xway.o
 obj-$(CONFIG_PINCTRL_LANTIQ)	+= pinctrl-lantiq.o
+obj-$(CONFIG_PINCTRL_ST) 	+= pinctrl-st.o
 
 obj-$(CONFIG_PLAT_ORION)        += mvebu/
 obj-$(CONFIG_ARCH_SHMOBILE)	+= sh-pfc/
diff --git a/drivers/pinctrl/pinctrl-st.c b/drivers/pinctrl/pinctrl-st.c
new file mode 100644
index 000000000000..04d4506ae18d
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-st.c
@@ -0,0 +1,1403 @@
+/*
+ * Copyright (C) 2013 STMicroelectronics (R&D) Limited.
+ * Authors:
+ *	Srinivas Kandagatla <srinivas.kandagatla@st.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/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/of_address.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/platform_device.h>
+#include "core.h"
+
+/* PIO Block registers */
+/* PIO output */
+#define REG_PIO_POUT			0x00
+/* Set bits of POUT */
+#define REG_PIO_SET_POUT		0x04
+/* Clear bits of POUT */
+#define REG_PIO_CLR_POUT		0x08
+/* PIO input */
+#define REG_PIO_PIN			0x10
+/* PIO configuration */
+#define REG_PIO_PC(n)			(0x20 + (n) * 0x10)
+/* Set bits of PC[2:0] */
+#define REG_PIO_SET_PC(n)		(0x24 + (n) * 0x10)
+/* Clear bits of PC[2:0] */
+#define REG_PIO_CLR_PC(n)		(0x28 + (n) * 0x10)
+/* PIO input comparison */
+#define REG_PIO_PCOMP			0x50
+/* Set bits of PCOMP */
+#define REG_PIO_SET_PCOMP		0x54
+/* Clear bits of PCOMP */
+#define REG_PIO_CLR_PCOMP		0x58
+/* PIO input comparison mask */
+#define REG_PIO_PMASK			0x60
+/* Set bits of PMASK */
+#define REG_PIO_SET_PMASK		0x64
+/* Clear bits of PMASK */
+#define REG_PIO_CLR_PMASK		0x68
+
+#define ST_GPIO_DIRECTION_BIDIR	0x1
+#define ST_GPIO_DIRECTION_OUT	0x2
+#define ST_GPIO_DIRECTION_IN	0x4
+
+/**
+ *  Packed style retime configuration.
+ *  There are two registers cfg0 and cfg1 in this style for each bank.
+ *  Each field in this register is 8 bit corresponding to 8 pins in the bank.
+ */
+#define RT_P_CFGS_PER_BANK			2
+#define RT_P_CFG0_CLK1NOTCLK0_FIELD(reg)	REG_FIELD(reg, 0, 7)
+#define RT_P_CFG0_DELAY_0_FIELD(reg)		REG_FIELD(reg, 16, 23)
+#define RT_P_CFG0_DELAY_1_FIELD(reg)		REG_FIELD(reg, 24, 31)
+#define RT_P_CFG1_INVERTCLK_FIELD(reg)		REG_FIELD(reg, 0, 7)
+#define RT_P_CFG1_RETIME_FIELD(reg)		REG_FIELD(reg, 8, 15)
+#define RT_P_CFG1_CLKNOTDATA_FIELD(reg)		REG_FIELD(reg, 16, 23)
+#define RT_P_CFG1_DOUBLE_EDGE_FIELD(reg)	REG_FIELD(reg, 24, 31)
+
+/**
+ * Dedicated style retime Configuration register
+ * each register is dedicated per pin.
+ */
+#define RT_D_CFGS_PER_BANK		8
+#define RT_D_CFG_CLK_SHIFT		0
+#define RT_D_CFG_CLK_MASK		(0x3 << 0)
+#define RT_D_CFG_CLKNOTDATA_SHIFT	2
+#define RT_D_CFG_CLKNOTDATA_MASK	BIT(2)
+#define RT_D_CFG_DELAY_SHIFT		3
+#define RT_D_CFG_DELAY_MASK		(0xf << 3)
+#define RT_D_CFG_DELAY_INNOTOUT_SHIFT	7
+#define RT_D_CFG_DELAY_INNOTOUT_MASK	BIT(7)
+#define RT_D_CFG_DOUBLE_EDGE_SHIFT	8
+#define RT_D_CFG_DOUBLE_EDGE_MASK	BIT(8)
+#define RT_D_CFG_INVERTCLK_SHIFT	9
+#define RT_D_CFG_INVERTCLK_MASK		BIT(9)
+#define RT_D_CFG_RETIME_SHIFT		10
+#define RT_D_CFG_RETIME_MASK		BIT(10)
+
+/*
+ * Pinconf is represented in an opaque unsigned long variable.
+ * Below is the bit allocation details for each possible configuration.
+ * All the bit fields can be encapsulated into four variables
+ * (direction, retime-type, retime-clk, retime-delay)
+ *
+ *	 +----------------+
+ *[31:28]| reserved-3     |
+ *	 +----------------+-------------
+ *[27]   |	oe	  |		|
+ *	 +----------------+		v
+ *[26]   |	pu	  |	[Direction	]
+ *	 +----------------+		^
+ *[25]   |	od	  |		|
+ *	 +----------------+-------------
+ *[24]   | reserved-2     |
+ *	 +----------------+-------------
+ *[23]   |    retime      |		|
+ *	 +----------------+		|
+ *[22]   | retime-invclk  |		|
+ *	 +----------------+		v
+ *[21]   |retime-clknotdat|	[Retime-type	]
+ *	 +----------------+		^
+ *[20]   | retime-de      |		|
+ *	 +----------------+-------------
+ *[19:18]| retime-clk     |------>[Retime-Clk	]
+ *	 +----------------+
+ *[17:16]|  reserved-1    |
+ *	 +----------------+
+ *[15..0]| retime-delay   |------>[Retime Delay]
+ *	 +----------------+
+ */
+
+#define ST_PINCONF_UNPACK(conf, param)\
+				((conf >> ST_PINCONF_ ##param ##_SHIFT) \
+				& ST_PINCONF_ ##param ##_MASK)
+
+#define ST_PINCONF_PACK(conf, val, param)	(conf |=\
+				((val & ST_PINCONF_ ##param ##_MASK) << \
+					ST_PINCONF_ ##param ##_SHIFT))
+
+/* Output enable */
+#define ST_PINCONF_OE_MASK		0x1
+#define ST_PINCONF_OE_SHIFT		27
+#define ST_PINCONF_OE			BIT(27)
+#define ST_PINCONF_UNPACK_OE(conf)	ST_PINCONF_UNPACK(conf, OE)
+#define ST_PINCONF_PACK_OE(conf)	ST_PINCONF_PACK(conf, 1, OE)
+
+/* Pull Up */
+#define ST_PINCONF_PU_MASK		0x1
+#define ST_PINCONF_PU_SHIFT		26
+#define ST_PINCONF_PU			BIT(26)
+#define ST_PINCONF_UNPACK_PU(conf)	ST_PINCONF_UNPACK(conf, PU)
+#define ST_PINCONF_PACK_PU(conf)	ST_PINCONF_PACK(conf, 1, PU)
+
+/* Open Drain */
+#define ST_PINCONF_OD_MASK		0x1
+#define ST_PINCONF_OD_SHIFT		25
+#define ST_PINCONF_OD			BIT(25)
+#define ST_PINCONF_UNPACK_OD(conf)	ST_PINCONF_UNPACK(conf, OD)
+#define ST_PINCONF_PACK_OD(conf)	ST_PINCONF_PACK(conf, 1, OD)
+
+#define ST_PINCONF_RT_MASK		0x1
+#define ST_PINCONF_RT_SHIFT		23
+#define ST_PINCONF_RT			BIT(23)
+#define ST_PINCONF_UNPACK_RT(conf)	ST_PINCONF_UNPACK(conf, RT)
+#define ST_PINCONF_PACK_RT(conf)	ST_PINCONF_PACK(conf, 1, RT)
+
+#define ST_PINCONF_RT_INVERTCLK_MASK	0x1
+#define ST_PINCONF_RT_INVERTCLK_SHIFT	22
+#define ST_PINCONF_RT_INVERTCLK		BIT(22)
+#define ST_PINCONF_UNPACK_RT_INVERTCLK(conf) \
+			ST_PINCONF_UNPACK(conf, RT_INVERTCLK)
+#define ST_PINCONF_PACK_RT_INVERTCLK(conf) \
+			ST_PINCONF_PACK(conf, 1, RT_INVERTCLK)
+
+#define ST_PINCONF_RT_CLKNOTDATA_MASK	0x1
+#define ST_PINCONF_RT_CLKNOTDATA_SHIFT	21
+#define ST_PINCONF_RT_CLKNOTDATA	BIT(21)
+#define ST_PINCONF_UNPACK_RT_CLKNOTDATA(conf)	\
+				ST_PINCONF_UNPACK(conf, RT_CLKNOTDATA)
+#define ST_PINCONF_PACK_RT_CLKNOTDATA(conf) \
+				ST_PINCONF_PACK(conf, 1, RT_CLKNOTDATA)
+
+#define ST_PINCONF_RT_DOUBLE_EDGE_MASK	0x1
+#define ST_PINCONF_RT_DOUBLE_EDGE_SHIFT	20
+#define ST_PINCONF_RT_DOUBLE_EDGE	BIT(20)
+#define ST_PINCONF_UNPACK_RT_DOUBLE_EDGE(conf) \
+				ST_PINCONF_UNPACK(conf, RT_DOUBLE_EDGE)
+#define ST_PINCONF_PACK_RT_DOUBLE_EDGE(conf) \
+				ST_PINCONF_PACK(conf, 1, RT_DOUBLE_EDGE)
+
+#define ST_PINCONF_RT_CLK_MASK		0x3
+#define ST_PINCONF_RT_CLK_SHIFT		18
+#define ST_PINCONF_RT_CLK		BIT(18)
+#define ST_PINCONF_UNPACK_RT_CLK(conf)	ST_PINCONF_UNPACK(conf, RT_CLK)
+#define ST_PINCONF_PACK_RT_CLK(conf, val) ST_PINCONF_PACK(conf, val, RT_CLK)
+
+/* RETIME_DELAY in Pico Secs */
+#define ST_PINCONF_RT_DELAY_MASK	0xffff
+#define ST_PINCONF_RT_DELAY_SHIFT	0
+#define ST_PINCONF_UNPACK_RT_DELAY(conf) ST_PINCONF_UNPACK(conf, RT_DELAY)
+#define ST_PINCONF_PACK_RT_DELAY(conf, val) \
+				ST_PINCONF_PACK(conf, val, RT_DELAY)
+
+#define ST_GPIO_PINS_PER_BANK	(8)
+#define OF_GPIO_ARGS_MIN	(4)
+#define OF_RT_ARGS_MIN		(2)
+
+#define gpio_range_to_bank(chip) \
+		container_of(chip, struct st_gpio_bank, range)
+
+#define gpio_chip_to_bank(chip) \
+		container_of(chip, struct st_gpio_bank, gpio_chip)
+
+
+enum st_retime_style {
+	st_retime_style_none,
+	st_retime_style_packed,
+	st_retime_style_dedicated,
+};
+
+struct st_retime_dedicated {
+	struct regmap_field *rt[ST_GPIO_PINS_PER_BANK];
+};
+
+struct st_retime_packed {
+	struct regmap_field *clk1notclk0;
+	struct regmap_field *delay_0;
+	struct regmap_field *delay_1;
+	struct regmap_field *invertclk;
+	struct regmap_field *retime;
+	struct regmap_field *clknotdata;
+	struct regmap_field *double_edge;
+};
+
+struct st_pio_control {
+	u32 rt_pin_mask;
+	struct regmap_field *alt, *oe, *pu, *od;
+	/* retiming */
+	union {
+		struct st_retime_packed		rt_p;
+		struct st_retime_dedicated	rt_d;
+	} rt;
+};
+
+struct st_pctl_data {
+	enum st_retime_style rt_style;
+	unsigned int	*input_delays;
+	int		ninput_delays;
+	unsigned int	*output_delays;
+	int		noutput_delays;
+	/* register offset information */
+	int alt, oe, pu, od, rt;
+};
+
+struct st_pinconf {
+	int		pin;
+	const char	*name;
+	unsigned long	config;
+	int		altfunc;
+};
+
+struct st_pmx_func {
+	const char	*name;
+	const char	**groups;
+	unsigned	ngroups;
+};
+
+struct st_pctl_group {
+	const char		*name;
+	unsigned int		*pins;
+	unsigned		npins;
+	struct st_pinconf	*pin_conf;
+};
+
+struct st_gpio_bank {
+	struct gpio_chip		gpio_chip;
+	struct pinctrl_gpio_range	range;
+	void __iomem			*base;
+	struct st_pio_control		pc;
+};
+
+struct st_pinctrl {
+	struct device			*dev;
+	struct pinctrl_dev		*pctl;
+	struct st_gpio_bank		*banks;
+	int				nbanks;
+	struct st_pmx_func		*functions;
+	int				nfunctions;
+	struct st_pctl_group		*groups;
+	int				ngroups;
+	struct regmap			*regmap;
+	const struct st_pctl_data	*data;
+};
+
+/* SOC specific data */
+/* STiH415 data */
+unsigned int stih415_input_delays[] = {0, 500, 1000, 1500};
+unsigned int stih415_output_delays[] = {0, 1000, 2000, 3000};
+
+#define STIH415_PCTRL_COMMON_DATA				\
+	.rt_style	= st_retime_style_packed,		\
+	.input_delays	= stih415_input_delays,			\
+	.ninput_delays	= 4,					\
+	.output_delays = stih415_output_delays,			\
+	.noutput_delays = 4
+
+static const struct st_pctl_data  stih415_sbc_data = {
+	STIH415_PCTRL_COMMON_DATA,
+	.alt = 0, .oe = 5, .pu = 7, .od = 9, .rt = 16,
+};
+
+static const struct st_pctl_data  stih415_front_data = {
+	STIH415_PCTRL_COMMON_DATA,
+	.alt = 0, .oe = 8, .pu = 10, .od = 12, .rt = 16,
+};
+
+static const struct st_pctl_data  stih415_rear_data = {
+	STIH415_PCTRL_COMMON_DATA,
+	.alt = 0, .oe = 6, .pu = 8, .od = 10, .rt = 38,
+};
+
+static const struct st_pctl_data  stih415_left_data = {
+	STIH415_PCTRL_COMMON_DATA,
+	.alt = 0, .oe = 3, .pu = 4, .od = 5, .rt = 6,
+};
+
+static const struct st_pctl_data  stih415_right_data = {
+	STIH415_PCTRL_COMMON_DATA,
+	.alt = 0, .oe = 5, .pu = 7, .od = 9, .rt = 11,
+};
+
+/* STiH416 data */
+unsigned int stih416_delays[] = {0, 300, 500, 750, 1000, 1250, 1500,
+			1750, 2000, 2250, 2500, 2750, 3000, 3250 };
+
+static const struct st_pctl_data  stih416_data = {
+	.rt_style	= st_retime_style_dedicated,
+	.input_delays	= stih416_delays,
+	.ninput_delays	= 14,
+	.output_delays	= stih416_delays,
+	.noutput_delays = 14,
+	.alt = 0, .oe = 40, .pu = 50, .od = 60, .rt = 100,
+};
+
+/* Low level functions.. */
+static inline int st_gpio_bank(int gpio)
+{
+	return gpio/ST_GPIO_PINS_PER_BANK;
+}
+
+static inline int st_gpio_pin(int gpio)
+{
+	return gpio%ST_GPIO_PINS_PER_BANK;
+}
+
+static void st_pinconf_set_config(struct st_pio_control *pc,
+				int pin, unsigned long config)
+{
+	struct regmap_field *output_enable = pc->oe;
+	struct regmap_field *pull_up = pc->pu;
+	struct regmap_field *open_drain = pc->od;
+	unsigned int oe_value, pu_value, od_value;
+	unsigned long mask = BIT(pin);
+
+	regmap_field_read(output_enable, &oe_value);
+	regmap_field_read(pull_up, &pu_value);
+	regmap_field_read(open_drain, &od_value);
+
+	/* Clear old values */
+	oe_value &= ~mask;
+	pu_value &= ~mask;
+	od_value &= ~mask;
+
+	if (config & ST_PINCONF_OE)
+		oe_value |= mask;
+	if (config & ST_PINCONF_PU)
+		pu_value |= mask;
+	if (config & ST_PINCONF_OD)
+		od_value |= mask;
+
+	regmap_field_write(output_enable, oe_value);
+	regmap_field_write(pull_up, pu_value);
+	regmap_field_write(open_drain, od_value);
+}
+
+static void st_pctl_set_function(struct st_pio_control *pc,
+				int pin_id, int function)
+{
+	struct regmap_field *alt = pc->alt;
+	unsigned int val;
+	int pin = st_gpio_pin(pin_id);
+	int offset = pin * 4;
+
+	regmap_field_read(alt, &val);
+	val &= ~(0xf << offset);
+	val |= function << offset;
+	regmap_field_write(alt, val);
+}
+
+static unsigned long st_pinconf_delay_to_bit(unsigned int delay,
+	const struct st_pctl_data *data, unsigned long config)
+{
+	unsigned int *delay_times;
+	int num_delay_times, i, closest_index = -1;
+	unsigned int closest_divergence = UINT_MAX;
+
+	if (ST_PINCONF_UNPACK_OE(config)) {
+		delay_times = data->output_delays;
+		num_delay_times = data->noutput_delays;
+	} else {
+		delay_times = data->input_delays;
+		num_delay_times = data->ninput_delays;
+	}
+
+	for (i = 0; i < num_delay_times; i++) {
+		unsigned int divergence = abs(delay - delay_times[i]);
+
+		if (divergence == 0)
+			return i;
+
+		if (divergence < closest_divergence) {
+			closest_divergence = divergence;
+			closest_index = i;
+		}
+	}
+
+	pr_warn("Attempt to set delay %d, closest available %d\n",
+	     delay, delay_times[closest_index]);
+
+	return closest_index;
+}
+
+static unsigned long st_pinconf_bit_to_delay(unsigned int index,
+	const struct st_pctl_data *data, unsigned long output)
+{
+	unsigned int *delay_times;
+	int num_delay_times;
+
+	if (output) {
+		delay_times = data->output_delays;
+		num_delay_times = data->noutput_delays;
+	} else {
+		delay_times = data->input_delays;
+		num_delay_times = data->ninput_delays;
+	}
+
+	if (index < num_delay_times) {
+		return delay_times[index];
+	} else {
+		pr_warn("Delay not found in/out delay list\n");
+		return 0;
+	}
+}
+
+static void st_regmap_field_bit_set_clear_pin(struct regmap_field *field,
+	int enable, int pin)
+{
+	unsigned int val = 0;
+
+	regmap_field_read(field, &val);
+	if (enable)
+		val |= BIT(pin);
+	else
+		val &= ~BIT(pin);
+	regmap_field_write(field, val);
+}
+
+static void st_pinconf_set_retime_packed(struct st_pinctrl *info,
+	struct st_pio_control *pc,	unsigned long config, int pin)
+{
+	const struct st_pctl_data *data = info->data;
+	struct st_retime_packed *rt_p = &pc->rt.rt_p;
+	unsigned int delay;
+
+	st_regmap_field_bit_set_clear_pin(rt_p->clk1notclk0,
+				ST_PINCONF_UNPACK_RT_CLK(config), pin);
+
+	st_regmap_field_bit_set_clear_pin(rt_p->clknotdata,
+				ST_PINCONF_UNPACK_RT_CLKNOTDATA(config), pin);
+
+	st_regmap_field_bit_set_clear_pin(rt_p->double_edge,
+				ST_PINCONF_UNPACK_RT_DOUBLE_EDGE(config), pin);
+
+	st_regmap_field_bit_set_clear_pin(rt_p->invertclk,
+				ST_PINCONF_UNPACK_RT_INVERTCLK(config), pin);
+
+	st_regmap_field_bit_set_clear_pin(rt_p->retime,
+				ST_PINCONF_UNPACK_RT(config), pin);
+
+	delay = st_pinconf_delay_to_bit(ST_PINCONF_UNPACK_RT_DELAY(config),
+					data, config);
+	/* 2 bit delay, lsb */
+	st_regmap_field_bit_set_clear_pin(rt_p->delay_0, delay & 0x1, pin);
+	/* 2 bit delay, msb */
+	st_regmap_field_bit_set_clear_pin(rt_p->delay_1, delay & 0x2, pin);
+
+}
+
+static void st_pinconf_set_retime_dedicated(struct st_pinctrl *info,
+	struct st_pio_control *pc, unsigned long config, int pin)
+{
+	int input	= ST_PINCONF_UNPACK_OE(config) ? 0 : 1;
+	int clk		= ST_PINCONF_UNPACK_RT_CLK(config);
+	int clknotdata	= ST_PINCONF_UNPACK_RT_CLKNOTDATA(config);
+	int double_edge	= ST_PINCONF_UNPACK_RT_DOUBLE_EDGE(config);
+	int invertclk	= ST_PINCONF_UNPACK_RT_INVERTCLK(config);
+	int retime	= ST_PINCONF_UNPACK_RT(config);
+
+	unsigned long delay = st_pinconf_delay_to_bit(
+			ST_PINCONF_UNPACK_RT_DELAY(config),
+			info->data, config);
+	struct st_retime_dedicated *rt_d = &pc->rt.rt_d;
+
+	unsigned long retime_config =
+		((clk) << RT_D_CFG_CLK_SHIFT) |
+		((delay) << RT_D_CFG_DELAY_SHIFT) |
+		((input) << RT_D_CFG_DELAY_INNOTOUT_SHIFT) |
+		((retime) << RT_D_CFG_RETIME_SHIFT) |
+		((clknotdata) << RT_D_CFG_CLKNOTDATA_SHIFT) |
+		((invertclk) << RT_D_CFG_INVERTCLK_SHIFT) |
+		((double_edge) << RT_D_CFG_DOUBLE_EDGE_SHIFT);
+
+	regmap_field_write(rt_d->rt[pin], retime_config);
+}
+
+static void st_pinconf_get_direction(struct st_pio_control *pc,
+	int pin, unsigned long *config)
+{
+	unsigned int oe_value, pu_value, od_value;
+
+	regmap_field_read(pc->oe, &oe_value);
+	regmap_field_read(pc->pu, &pu_value);
+	regmap_field_read(pc->od, &od_value);
+
+	if (oe_value & BIT(pin))
+		ST_PINCONF_PACK_OE(*config);
+	if (pu_value & BIT(pin))
+		ST_PINCONF_PACK_PU(*config);
+	if (od_value & BIT(pin))
+		ST_PINCONF_PACK_OD(*config);
+
+}
+
+static int st_pinconf_get_retime_packed(struct st_pinctrl *info,
+	struct st_pio_control *pc,	int pin, unsigned long *config)
+{
+	const struct st_pctl_data *data = info->data;
+	struct st_retime_packed *rt_p = &pc->rt.rt_p;
+	unsigned int delay_bits, delay, delay0, delay1, val;
+	int output = ST_PINCONF_UNPACK_OE(*config);
+
+	if (!regmap_field_read(rt_p->retime, &val) && (val & BIT(pin)))
+		ST_PINCONF_PACK_RT(*config);
+
+	if (!regmap_field_read(rt_p->clk1notclk0, &val) && (val & BIT(pin)))
+		ST_PINCONF_PACK_RT_CLK(*config, 1);
+
+	if (!regmap_field_read(rt_p->clknotdata, &val) && (val & BIT(pin)))
+		ST_PINCONF_PACK_RT_CLKNOTDATA(*config);
+
+	if (!regmap_field_read(rt_p->double_edge, &val) && (val & BIT(pin)))
+		ST_PINCONF_PACK_RT_DOUBLE_EDGE(*config);
+
+	if (!regmap_field_read(rt_p->invertclk, &val) && (val & BIT(pin)))
+		ST_PINCONF_PACK_RT_INVERTCLK(*config);
+
+	regmap_field_read(rt_p->delay_0, &delay0);
+	regmap_field_read(rt_p->delay_1, &delay1);
+	delay_bits = (((delay1 & BIT(pin)) ? 1 : 0) << 1) |
+			(((delay0 & BIT(pin)) ? 1 : 0));
+	delay =  st_pinconf_bit_to_delay(delay_bits, data, output);
+	ST_PINCONF_PACK_RT_DELAY(*config, delay);
+
+	return 0;
+}
+
+static int st_pinconf_get_retime_dedicated(struct st_pinctrl *info,
+	struct st_pio_control *pc,	int pin, unsigned long *config)
+{
+	unsigned int value;
+	unsigned long delay_bits, delay, rt_clk;
+	int output = ST_PINCONF_UNPACK_OE(*config);
+	struct st_retime_dedicated *rt_d = &pc->rt.rt_d;
+
+	regmap_field_read(rt_d->rt[pin], &value);
+
+	rt_clk = (value & RT_D_CFG_CLK_MASK) >> RT_D_CFG_CLK_SHIFT;
+	ST_PINCONF_PACK_RT_CLK(*config, rt_clk);
+
+	delay_bits = (value & RT_D_CFG_DELAY_MASK) >> RT_D_CFG_DELAY_SHIFT;
+	delay =  st_pinconf_bit_to_delay(delay_bits, info->data, output);
+	ST_PINCONF_PACK_RT_DELAY(*config, delay);
+
+	if (value & RT_D_CFG_CLKNOTDATA_MASK)
+		ST_PINCONF_PACK_RT_CLKNOTDATA(*config);
+
+	if (value & RT_D_CFG_DOUBLE_EDGE_MASK)
+		ST_PINCONF_PACK_RT_DOUBLE_EDGE(*config);
+
+	if (value & RT_D_CFG_INVERTCLK_MASK)
+		ST_PINCONF_PACK_RT_INVERTCLK(*config);
+
+	if (value & RT_D_CFG_RETIME_MASK)
+		ST_PINCONF_PACK_RT(*config);
+
+	return 0;
+}
+
+/* GPIO related functions */
+
+static inline void __st_gpio_set(struct st_gpio_bank *bank,
+	unsigned offset, int value)
+{
+	if (value)
+		writel(BIT(offset), bank->base + REG_PIO_SET_POUT);
+	else
+		writel(BIT(offset), bank->base + REG_PIO_CLR_POUT);
+}
+
+static void st_gpio_direction(struct st_gpio_bank *bank,
+		unsigned int gpio, unsigned int direction)
+{
+	int offset = st_gpio_pin(gpio);
+	int i = 0;
+	/**
+	 * There are three configuration registers (PIOn_PC0, PIOn_PC1
+	 * and PIOn_PC2) for each port. These are used to configure the
+	 * PIO port pins. Each pin can be configured as an input, output,
+	 * bidirectional, or alternative function pin. Three bits, one bit
+	 * from each of the three registers, configure the corresponding bit of
+	 * the port. Valid bit settings is:
+	 *
+	 * PC2		PC1		PC0	Direction.
+	 * 0		0		0	[Input Weak pull-up]
+	 * 0		0 or 1		1	[Bidirection]
+	 * 0		1		0	[Output]
+	 * 1		0		0	[Input]
+	 *
+	 * PIOn_SET_PC and PIOn_CLR_PC registers are used to set and clear bits
+	 * individually.
+	 */
+	for (i = 0; i <= 2; i++) {
+		if (direction & BIT(i))
+			writel(BIT(offset), bank->base + REG_PIO_SET_PC(i));
+		else
+			writel(BIT(offset), bank->base + REG_PIO_CLR_PC(i));
+	}
+}
+
+static int st_gpio_request(struct gpio_chip *chip, unsigned offset)
+{
+	return pinctrl_request_gpio(chip->base + offset);
+}
+
+static void st_gpio_free(struct gpio_chip *chip, unsigned offset)
+{
+	pinctrl_free_gpio(chip->base + offset);
+}
+
+static int st_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+	struct st_gpio_bank *bank = gpio_chip_to_bank(chip);
+
+	return !!(readl(bank->base + REG_PIO_PIN) & BIT(offset));
+}
+
+static void st_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+	struct st_gpio_bank *bank = gpio_chip_to_bank(chip);
+	__st_gpio_set(bank, offset, value);
+}
+
+static int st_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+	pinctrl_gpio_direction_input(chip->base + offset);
+
+	return 0;
+}
+
+static int st_gpio_direction_output(struct gpio_chip *chip,
+	unsigned offset, int value)
+{
+	struct st_gpio_bank *bank = gpio_chip_to_bank(chip);
+
+	__st_gpio_set(bank, offset, value);
+	pinctrl_gpio_direction_output(chip->base + offset);
+
+	return 0;
+}
+
+static int st_gpio_xlate(struct gpio_chip *gc,
+			const struct of_phandle_args *gpiospec, u32 *flags)
+{
+	if (WARN_ON(gc->of_gpio_n_cells < 1))
+		return -EINVAL;
+
+	if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
+		return -EINVAL;
+
+	if (gpiospec->args[0] > gc->ngpio)
+		return -EINVAL;
+
+	return gpiospec->args[0];
+}
+
+/* Pinctrl Groups */
+static int st_pctl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+
+	return info->ngroups;
+}
+
+static const char *st_pctl_get_group_name(struct pinctrl_dev *pctldev,
+				       unsigned selector)
+{
+	struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+
+	return info->groups[selector].name;
+}
+
+static int st_pctl_get_group_pins(struct pinctrl_dev *pctldev,
+	unsigned selector, const unsigned **pins, unsigned *npins)
+{
+	struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+
+	if (selector >= info->ngroups)
+		return -EINVAL;
+
+	*pins = info->groups[selector].pins;
+	*npins = info->groups[selector].npins;
+
+	return 0;
+}
+
+static const inline struct st_pctl_group *st_pctl_find_group_by_name(
+	const struct st_pinctrl *info, const char *name)
+{
+	int i;
+
+	for (i = 0; i < info->ngroups; i++) {
+		if (!strcmp(info->groups[i].name, name))
+			return &info->groups[i];
+	}
+
+	return NULL;
+}
+
+static int st_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
+	struct device_node *np, struct pinctrl_map **map, unsigned *num_maps)
+{
+	struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+	const struct st_pctl_group *grp;
+	struct pinctrl_map *new_map;
+	struct device_node *parent;
+	int map_num, i;
+
+	grp = st_pctl_find_group_by_name(info, np->name);
+	if (!grp) {
+		dev_err(info->dev, "unable to find group for node %s\n",
+			np->name);
+		return -EINVAL;
+	}
+
+	map_num = grp->npins + 1;
+	new_map = devm_kzalloc(pctldev->dev,
+				sizeof(*new_map) * map_num, GFP_KERNEL);
+	if (!new_map)
+		return -ENOMEM;
+
+	parent = of_get_parent(np);
+	if (!parent) {
+		devm_kfree(pctldev->dev, new_map);
+		return -EINVAL;
+	}
+
+	*map = new_map;
+	*num_maps = map_num;
+	new_map[0].type = PIN_MAP_TYPE_MUX_GROUP;
+	new_map[0].data.mux.function = parent->name;
+	new_map[0].data.mux.group = np->name;
+	of_node_put(parent);
+
+	/* create config map per pin */
+	new_map++;
+	for (i = 0; i < grp->npins; i++) {
+		new_map[i].type = PIN_MAP_TYPE_CONFIGS_PIN;
+		new_map[i].data.configs.group_or_pin =
+				pin_get_name(pctldev, grp->pins[i]);
+		new_map[i].data.configs.configs = &grp->pin_conf[i].config;
+		new_map[i].data.configs.num_configs = 1;
+	}
+	dev_info(pctldev->dev, "maps: function %s group %s num %d\n",
+		(*map)->data.mux.function, grp->name, map_num);
+
+	return 0;
+}
+
+static void st_pctl_dt_free_map(struct pinctrl_dev *pctldev,
+			struct pinctrl_map *map, unsigned num_maps)
+{
+}
+
+static struct pinctrl_ops st_pctlops = {
+	.get_groups_count	= st_pctl_get_groups_count,
+	.get_group_pins		= st_pctl_get_group_pins,
+	.get_group_name		= st_pctl_get_group_name,
+	.dt_node_to_map		= st_pctl_dt_node_to_map,
+	.dt_free_map		= st_pctl_dt_free_map,
+};
+
+/* Pinmux */
+static int st_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
+{
+	struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+
+	return info->nfunctions;
+}
+
+const char *st_pmx_get_fname(struct pinctrl_dev *pctldev,
+	unsigned selector)
+{
+	struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+
+	return info->functions[selector].name;
+}
+
+static int st_pmx_get_groups(struct pinctrl_dev *pctldev,
+	unsigned selector, const char * const **grps, unsigned * const ngrps)
+{
+	struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+	*grps = info->functions[selector].groups;
+	*ngrps = info->functions[selector].ngroups;
+
+	return 0;
+}
+
+static struct st_pio_control *st_get_pio_control(
+			struct pinctrl_dev *pctldev, int pin)
+{
+	struct pinctrl_gpio_range *range =
+			 pinctrl_find_gpio_range_from_pin(pctldev, pin);
+	struct st_gpio_bank *bank = gpio_range_to_bank(range);
+
+	return &bank->pc;
+}
+
+static int st_pmx_enable(struct pinctrl_dev *pctldev, unsigned fselector,
+		unsigned group)
+{
+	struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+	struct st_pinconf *conf = info->groups[group].pin_conf;
+	struct st_pio_control *pc;
+	int i;
+
+	for (i = 0; i < info->groups[group].npins; i++) {
+		pc = st_get_pio_control(pctldev, conf[i].pin);
+		st_pctl_set_function(pc, conf[i].pin, conf[i].altfunc);
+	}
+
+	return 0;
+}
+
+static void st_pmx_disable(struct pinctrl_dev *pctldev, unsigned selector,
+		unsigned group)
+{
+}
+
+static int st_pmx_set_gpio_direction(struct pinctrl_dev *pctldev,
+			struct pinctrl_gpio_range *range, unsigned gpio,
+			bool input)
+{
+	struct st_gpio_bank *bank = gpio_range_to_bank(range);
+	/*
+	 * When a PIO bank is used in its primary function mode (altfunc = 0)
+	 * Output Enable (OE), Open Drain(OD), and Pull Up (PU)
+	 * for the primary PIO functions are driven by the related PIO block
+	 */
+	st_pctl_set_function(&bank->pc, gpio, 0);
+	st_gpio_direction(bank, gpio, input ?
+		ST_GPIO_DIRECTION_IN : ST_GPIO_DIRECTION_OUT);
+
+	return 0;
+}
+
+static struct pinmux_ops st_pmxops = {
+	.get_functions_count	= st_pmx_get_funcs_count,
+	.get_function_name	= st_pmx_get_fname,
+	.get_function_groups	= st_pmx_get_groups,
+	.enable			= st_pmx_enable,
+	.disable		= st_pmx_disable,
+	.gpio_set_direction	= st_pmx_set_gpio_direction,
+};
+
+/* Pinconf  */
+static void st_pinconf_get_retime(struct st_pinctrl *info,
+	struct st_pio_control *pc, int pin, unsigned long *config)
+{
+	if (info->data->rt_style == st_retime_style_packed)
+		st_pinconf_get_retime_packed(info, pc, pin, config);
+	else if (info->data->rt_style == st_retime_style_dedicated)
+		if ((BIT(pin) & pc->rt_pin_mask))
+			st_pinconf_get_retime_dedicated(info, pc,
+					pin, config);
+}
+
+static void st_pinconf_set_retime(struct st_pinctrl *info,
+	struct st_pio_control *pc, int pin, unsigned long config)
+{
+	if (info->data->rt_style == st_retime_style_packed)
+		st_pinconf_set_retime_packed(info, pc, config, pin);
+	else if (info->data->rt_style == st_retime_style_dedicated)
+		if ((BIT(pin) & pc->rt_pin_mask))
+			st_pinconf_set_retime_dedicated(info, pc,
+							config, pin);
+}
+
+static int st_pinconf_set(struct pinctrl_dev *pctldev,
+			     unsigned pin_id, unsigned long config)
+{
+	int pin = st_gpio_pin(pin_id);
+	struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+	struct st_pio_control *pc = st_get_pio_control(pctldev, pin_id);
+
+	st_pinconf_set_config(pc, pin, config);
+	st_pinconf_set_retime(info, pc, pin, config);
+
+	return 0;
+}
+
+static int st_pinconf_get(struct pinctrl_dev *pctldev,
+			     unsigned pin_id, unsigned long *config)
+{
+	int pin = st_gpio_pin(pin_id);
+	struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+	struct st_pio_control *pc = st_get_pio_control(pctldev, pin_id);
+
+	*config = 0;
+	st_pinconf_get_direction(pc, pin, config);
+	st_pinconf_get_retime(info, pc, pin, config);
+
+	return 0;
+}
+
+static void st_pinconf_dbg_show(struct pinctrl_dev *pctldev,
+				   struct seq_file *s, unsigned pin_id)
+{
+	unsigned long config;
+	st_pinconf_get(pctldev, pin_id, &config);
+
+	seq_printf(s, "[OE:%ld,PU:%ld,OD:%ld]\n"
+		"\t\t[retime:%ld,invclk:%ld,clknotdat:%ld,"
+		"de:%ld,rt-clk:%ld,rt-delay:%ld]",
+		ST_PINCONF_UNPACK_OE(config),
+		ST_PINCONF_UNPACK_PU(config),
+		ST_PINCONF_UNPACK_OD(config),
+		ST_PINCONF_UNPACK_RT(config),
+		ST_PINCONF_UNPACK_RT_INVERTCLK(config),
+		ST_PINCONF_UNPACK_RT_CLKNOTDATA(config),
+		ST_PINCONF_UNPACK_RT_DOUBLE_EDGE(config),
+		ST_PINCONF_UNPACK_RT_CLK(config),
+		ST_PINCONF_UNPACK_RT_DELAY(config));
+}
+
+static struct pinconf_ops st_confops = {
+	.pin_config_get		= st_pinconf_get,
+	.pin_config_set		= st_pinconf_set,
+	.pin_config_dbg_show	= st_pinconf_dbg_show,
+};
+
+static void st_pctl_dt_child_count(struct st_pinctrl *info,
+				     struct device_node *np)
+{
+	struct device_node *child;
+	for_each_child_of_node(np, child) {
+		if (of_property_read_bool(child, "gpio-controller")) {
+			info->nbanks++;
+		} else {
+			info->nfunctions++;
+			info->ngroups += of_get_child_count(child);
+		}
+	}
+}
+
+static int st_pctl_dt_setup_retime_packed(struct st_pinctrl *info,
+	int bank, struct st_pio_control *pc)
+{
+	struct device *dev = info->dev;
+	struct regmap *rm = info->regmap;
+	const struct st_pctl_data *data = info->data;
+	/* 2 registers per bank */
+	int reg = (data->rt + bank * RT_P_CFGS_PER_BANK) * 4;
+	struct st_retime_packed *rt_p = &pc->rt.rt_p;
+	/* cfg0 */
+	struct reg_field clk1notclk0 = RT_P_CFG0_CLK1NOTCLK0_FIELD(reg);
+	struct reg_field delay_0 = RT_P_CFG0_DELAY_0_FIELD(reg);
+	struct reg_field delay_1 = RT_P_CFG0_DELAY_1_FIELD(reg);
+	/* cfg1 */
+	struct reg_field invertclk = RT_P_CFG1_INVERTCLK_FIELD(reg + 4);
+	struct reg_field retime = RT_P_CFG1_RETIME_FIELD(reg + 4);
+	struct reg_field clknotdata = RT_P_CFG1_CLKNOTDATA_FIELD(reg + 4);
+	struct reg_field double_edge = RT_P_CFG1_DOUBLE_EDGE_FIELD(reg + 4);
+
+	rt_p->clk1notclk0 = devm_regmap_field_alloc(dev, rm, clk1notclk0);
+	rt_p->delay_0	= devm_regmap_field_alloc(dev, rm, delay_0);
+	rt_p->delay_1 = devm_regmap_field_alloc(dev, rm, delay_1);
+	rt_p->invertclk = devm_regmap_field_alloc(dev, rm, invertclk);
+	rt_p->retime = devm_regmap_field_alloc(dev, rm, retime);
+	rt_p->clknotdata = devm_regmap_field_alloc(dev, rm, clknotdata);
+	rt_p->double_edge = devm_regmap_field_alloc(dev, rm, double_edge);
+
+	if (IS_ERR(rt_p->clk1notclk0) || IS_ERR(rt_p->delay_0) ||
+		 IS_ERR(rt_p->delay_1) || IS_ERR(rt_p->invertclk) ||
+		 IS_ERR(rt_p->retime) || IS_ERR(rt_p->clknotdata) ||
+		 IS_ERR(rt_p->double_edge))
+		return -EINVAL;
+
+	return 0;
+}
+
+static int st_pctl_dt_setup_retime_dedicated(struct st_pinctrl *info,
+	int bank, struct st_pio_control *pc)
+{
+	struct device *dev = info->dev;
+	struct regmap *rm = info->regmap;
+	const struct st_pctl_data *data = info->data;
+	/* 8 registers per bank */
+	int reg_offset = (data->rt + bank * RT_D_CFGS_PER_BANK) * 4;
+	struct st_retime_dedicated *rt_d = &pc->rt.rt_d;
+	unsigned int j;
+	u32 pin_mask = pc->rt_pin_mask;
+
+	for (j = 0; j < RT_D_CFGS_PER_BANK; j++) {
+		if (BIT(j) & pin_mask) {
+			struct reg_field reg = REG_FIELD(reg_offset, 0, 31);
+			rt_d->rt[j] = devm_regmap_field_alloc(dev, rm, reg);
+			if (IS_ERR(rt_d->rt[j]))
+				return -EINVAL;
+			reg_offset += 4;
+		}
+	}
+	return 0;
+}
+
+static int st_pctl_dt_setup_retime(struct st_pinctrl *info,
+	int bank, struct st_pio_control *pc)
+{
+	const struct st_pctl_data *data = info->data;
+	if (data->rt_style  == st_retime_style_packed)
+		return st_pctl_dt_setup_retime_packed(info, bank, pc);
+	else if (data->rt_style == st_retime_style_dedicated)
+		return st_pctl_dt_setup_retime_dedicated(info, bank, pc);
+
+	return -EINVAL;
+}
+
+static int st_parse_syscfgs(struct st_pinctrl *info,
+		int bank, struct device_node *np)
+{
+	const struct st_pctl_data *data = info->data;
+	/**
+	 * For a given shared register like OE/PU/OD, there are 8 bits per bank
+	 * 0:7 belongs to bank0, 8:15 belongs to bank1 ...
+	 * So each register is shared across 4 banks.
+	 */
+	int lsb = (bank%4) * ST_GPIO_PINS_PER_BANK;
+	int msb = lsb + ST_GPIO_PINS_PER_BANK - 1;
+	struct reg_field alt_reg = REG_FIELD((data->alt + bank) * 4, 0, 31);
+	struct reg_field oe_reg = REG_FIELD((data->oe + bank/4) * 4, lsb, msb);
+	struct reg_field pu_reg = REG_FIELD((data->pu + bank/4) * 4, lsb, msb);
+	struct reg_field od_reg = REG_FIELD((data->od + bank/4) * 4, lsb, msb);
+	struct st_pio_control *pc = &info->banks[bank].pc;
+	struct device *dev = info->dev;
+	struct regmap *regmap  = info->regmap;
+
+	pc->alt = devm_regmap_field_alloc(dev, regmap, alt_reg);
+	pc->oe = devm_regmap_field_alloc(dev, regmap, oe_reg);
+	pc->pu = devm_regmap_field_alloc(dev, regmap, pu_reg);
+	pc->od = devm_regmap_field_alloc(dev, regmap, od_reg);
+
+	if (IS_ERR(pc->alt) || IS_ERR(pc->oe) ||
+			IS_ERR(pc->pu) || IS_ERR(pc->od))
+		return -EINVAL;
+
+	/* retime avaiable for all pins by default */
+	pc->rt_pin_mask = 0xff;
+	of_property_read_u32(np, "st,retime-pin-mask", &pc->rt_pin_mask);
+	st_pctl_dt_setup_retime(info, bank, pc);
+
+	return 0;
+}
+
+/*
+ * Each pin is represented in of the below forms.
+ * <bank offset mux direction rt_type rt_delay rt_clk>
+ */
+static int st_pctl_dt_parse_groups(struct device_node *np,
+	struct st_pctl_group *grp, struct st_pinctrl *info, int idx)
+{
+	/* bank pad direction val altfunction */
+	const __be32 *list;
+	struct property *pp;
+	struct st_pinconf *conf;
+	phandle phandle;
+	struct device_node *pins;
+	u32 pin;
+	int i = 0, npins = 0, nr_props;
+
+	pins = of_get_child_by_name(np, "st,pins");
+	if (!pins)
+		return -ENODATA;
+
+	for_each_property_of_node(pins, pp) {
+		/* Skip those we do not want to proceed */
+		if (!strcmp(pp->name, "name"))
+			continue;
+
+		if (pp  && (pp->length/sizeof(__be32)) >= OF_GPIO_ARGS_MIN) {
+			npins++;
+		} else {
+			pr_warn("Invalid st,pins in %s node\n", np->name);
+			return -EINVAL;
+		}
+	}
+
+	grp->npins = npins;
+	grp->name = np->name;
+	grp->pins = devm_kzalloc(info->dev, npins * sizeof(u32), GFP_KERNEL);
+	grp->pin_conf = devm_kzalloc(info->dev,
+					npins * sizeof(*conf), GFP_KERNEL);
+
+	if (!grp->pins || !grp->pin_conf)
+		return -ENOMEM;
+
+	/* <bank offset mux direction rt_type rt_delay rt_clk> */
+	for_each_property_of_node(pins, pp) {
+		if (!strcmp(pp->name, "name"))
+			continue;
+		nr_props = pp->length/sizeof(u32);
+		list = pp->value;
+		conf = &grp->pin_conf[i];
+
+		/* bank & offset */
+		phandle = be32_to_cpup(list++);
+		pin = be32_to_cpup(list++);
+		conf->pin = of_get_named_gpio(pins, pp->name, 0);
+		conf->name = pp->name;
+		grp->pins[i] = conf->pin;
+		/* mux */
+		conf->altfunc = be32_to_cpup(list++);
+		conf->config = 0;
+		/* direction */
+		conf->config |= be32_to_cpup(list++);
+		/* rt_type rt_delay rt_clk */
+		if (nr_props >= OF_GPIO_ARGS_MIN + OF_RT_ARGS_MIN) {
+			/* rt_type */
+			conf->config |= be32_to_cpup(list++);
+			/* rt_delay */
+			conf->config |= be32_to_cpup(list++);
+			/* rt_clk */
+			if (nr_props > OF_GPIO_ARGS_MIN + OF_RT_ARGS_MIN)
+				conf->config |= be32_to_cpup(list++);
+		}
+		i++;
+	}
+	of_node_put(pins);
+
+	return 0;
+}
+
+static int st_pctl_parse_functions(struct device_node *np,
+			struct st_pinctrl *info, u32 index, int *grp_index)
+{
+	struct device_node *child;
+	struct st_pmx_func *func;
+	struct st_pctl_group *grp;
+	int ret, i;
+
+	func = &info->functions[index];
+	func->name = np->name;
+	func->ngroups = of_get_child_count(np);
+	if (func->ngroups <= 0) {
+		dev_err(info->dev, "No groups defined\n");
+		return -EINVAL;
+	}
+	func->groups = devm_kzalloc(info->dev,
+			func->ngroups * sizeof(char *), GFP_KERNEL);
+	if (!func->groups)
+		return -ENOMEM;
+
+	i = 0;
+	for_each_child_of_node(np, child) {
+		func->groups[i] = child->name;
+		grp = &info->groups[*grp_index];
+		*grp_index += 1;
+		ret = st_pctl_dt_parse_groups(child, grp, info, i++);
+		if (ret)
+			return ret;
+	}
+	dev_info(info->dev, "Function[%d\t name:%s,\tgroups:%d]\n",
+				index, func->name, func->ngroups);
+
+	return 0;
+}
+
+static struct gpio_chip st_gpio_template = {
+	.request		= st_gpio_request,
+	.free			= st_gpio_free,
+	.get			= st_gpio_get,
+	.set			= st_gpio_set,
+	.direction_input	= st_gpio_direction_input,
+	.direction_output	= st_gpio_direction_output,
+	.ngpio			= ST_GPIO_PINS_PER_BANK,
+	.of_gpio_n_cells	= 1,
+	.of_xlate		= st_gpio_xlate,
+};
+
+static int st_gpiolib_register_bank(struct st_pinctrl *info,
+	int bank_nr, struct device_node *np)
+{
+	struct st_gpio_bank *bank = &info->banks[bank_nr];
+	struct pinctrl_gpio_range *range = &bank->range;
+	struct device *dev = info->dev;
+	int bank_num = of_alias_get_id(np, "gpio");
+	struct resource res;
+	int err;
+
+	if (of_address_to_resource(np, 0, &res))
+		return -ENODEV;
+
+	bank->base = devm_request_and_ioremap(dev, &res);
+	if (!bank->base) {
+		dev_err(dev, "Can't get IO memory mapping!\n");
+		return -ENODEV;
+	}
+
+	bank->gpio_chip = st_gpio_template;
+	bank->gpio_chip.base = bank_num * ST_GPIO_PINS_PER_BANK;
+	bank->gpio_chip.ngpio = ST_GPIO_PINS_PER_BANK;
+	bank->gpio_chip.of_node = np;
+
+	of_property_read_string(np, "st,bank-name", &range->name);
+	bank->gpio_chip.label = range->name;
+
+	range->id = bank_num;
+	range->pin_base = range->base = range->id * ST_GPIO_PINS_PER_BANK;
+	range->npins = bank->gpio_chip.ngpio;
+	range->gc = &bank->gpio_chip;
+	err  = gpiochip_add(&bank->gpio_chip);
+	if (err) {
+		dev_err(dev, "Failed to add gpiochip(%d)!\n", bank_num);
+		return err;
+	}
+	dev_info(dev, "%s bank added.\n", range->name);
+
+	return 0;
+}
+
+static struct of_device_id st_pctl_of_match[] = {
+	{ .compatible = "st,stih415-sbc-pinctrl", .data = &stih415_sbc_data },
+	{ .compatible = "st,stih415-rear-pinctrl", .data = &stih415_rear_data },
+	{ .compatible = "st,stih415-left-pinctrl", .data = &stih415_left_data },
+	{ .compatible = "st,stih415-right-pinctrl",
+		.data = &stih415_right_data },
+	{ .compatible = "st,stih415-front-pinctrl",
+		.data = &stih415_front_data },
+	{ .compatible = "st,stih416-sbc-pinctrl", .data = &stih416_data},
+	{ .compatible = "st,stih416-front-pinctrl", .data = &stih416_data},
+	{ .compatible = "st,stih416-rear-pinctrl", .data = &stih416_data},
+	{ .compatible = "st,stih416-fvdp-fe-pinctrl", .data = &stih416_data},
+	{ .compatible = "st,stih416-fvdp-lite-pinctrl", .data = &stih416_data},
+	{ /* sentinel */ }
+};
+
+static int st_pctl_probe_dt(struct platform_device *pdev,
+	struct pinctrl_desc *pctl_desc, struct st_pinctrl *info)
+{
+	int ret = 0;
+	int i = 0, j = 0, k = 0, bank;
+	struct pinctrl_pin_desc *pdesc;
+	struct device_node *np = pdev->dev.of_node;
+	struct device_node *child;
+	int grp_index = 0;
+
+	st_pctl_dt_child_count(info, np);
+	if (!info->nbanks) {
+		dev_err(&pdev->dev, "you need atleast one gpio bank\n");
+		return -EINVAL;
+	}
+
+	dev_info(&pdev->dev, "nbanks = %d\n", info->nbanks);
+	dev_info(&pdev->dev, "nfunctions = %d\n", info->nfunctions);
+	dev_info(&pdev->dev, "ngroups = %d\n", info->ngroups);
+
+	info->functions = devm_kzalloc(&pdev->dev,
+		info->nfunctions * sizeof(*info->functions), GFP_KERNEL);
+
+	info->groups = devm_kzalloc(&pdev->dev,
+			info->ngroups * sizeof(*info->groups) ,	GFP_KERNEL);
+
+	info->banks = devm_kzalloc(&pdev->dev,
+			info->nbanks * sizeof(*info->banks), GFP_KERNEL);
+
+	if (!info->functions || !info->groups || !info->banks)
+		return -ENOMEM;
+
+	info->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
+	if (IS_ERR(info->regmap)) {
+		dev_err(info->dev, "No syscfg phandle specified\n");
+		return PTR_ERR(info->regmap);
+	}
+	info->data = of_match_node(st_pctl_of_match, np)->data;
+
+	pctl_desc->npins = info->nbanks * ST_GPIO_PINS_PER_BANK;
+	pdesc =	devm_kzalloc(&pdev->dev,
+			sizeof(*pdesc) * pctl_desc->npins, GFP_KERNEL);
+	if (!pdesc)
+		return -ENOMEM;
+
+	pctl_desc->pins = pdesc;
+
+	bank = 0;
+	for_each_child_of_node(np, child) {
+		if (of_property_read_bool(child, "gpio-controller")) {
+			const char *bank_name = NULL;
+			ret = st_gpiolib_register_bank(info, bank, child);
+			if (ret)
+				return ret;
+
+			k = info->banks[bank].range.pin_base;
+			bank_name = info->banks[bank].range.name;
+			for (j = 0; j < ST_GPIO_PINS_PER_BANK; j++, k++) {
+				pdesc->number = k;
+				pdesc->name = kasprintf(GFP_KERNEL, "%s[%d]",
+							bank_name, j);
+				pdesc++;
+			}
+			st_parse_syscfgs(info, bank, child);
+			bank++;
+		} else {
+			ret = st_pctl_parse_functions(child, info,
+							i++, &grp_index);
+			if (ret) {
+				dev_err(&pdev->dev, "No functions found.\n");
+				return ret;
+			}
+		}
+	}
+
+	return 0;
+}
+
+static int st_pctl_probe(struct platform_device *pdev)
+{
+	struct st_pinctrl *info;
+	struct pinctrl_desc *pctl_desc;
+	int ret, i;
+
+	if (!pdev->dev.of_node) {
+		dev_err(&pdev->dev, "device node not found.\n");
+		return -EINVAL;
+	}
+
+	pctl_desc = devm_kzalloc(&pdev->dev, sizeof(*pctl_desc), GFP_KERNEL);
+	if (!pctl_desc)
+		return -ENOMEM;
+
+	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	info->dev = &pdev->dev;
+	platform_set_drvdata(pdev, info);
+	ret = st_pctl_probe_dt(pdev, pctl_desc, info);
+	if (ret)
+		return ret;
+
+	pctl_desc->owner	= THIS_MODULE,
+	pctl_desc->pctlops	= &st_pctlops,
+	pctl_desc->pmxops	= &st_pmxops,
+	pctl_desc->confops	= &st_confops,
+	pctl_desc->name		= dev_name(&pdev->dev);
+
+	info->pctl = pinctrl_register(pctl_desc, &pdev->dev, info);
+	if (!info->pctl) {
+		dev_err(&pdev->dev, "Failed pinctrl registration\n");
+		return -EINVAL;
+	}
+
+	for (i = 0; i < info->nbanks; i++)
+		pinctrl_add_gpio_range(info->pctl, &info->banks[i].range);
+
+	return 0;
+}
+
+static struct platform_driver st_pctl_driver = {
+	.driver = {
+		.name = "st-pinctrl",
+		.owner = THIS_MODULE,
+		.of_match_table = st_pctl_of_match,
+	},
+	.probe = st_pctl_probe,
+};
+
+static int __init st_pctl_init(void)
+{
+	return platform_driver_register(&st_pctl_driver);
+}
+arch_initcall(st_pctl_init);
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 02d84e24b7c2..75981d0b57dc 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -23,6 +23,7 @@ struct irq_domain;
 struct spi_device;
 struct regmap;
 struct regmap_range_cfg;
+struct regmap_field;
 
 /* An enum of all the supported cache types */
 enum regcache_type {
@@ -394,10 +395,15 @@ bool regmap_can_raw_write(struct regmap *map);
 int regcache_sync(struct regmap *map);
 int regcache_sync_region(struct regmap *map, unsigned int min,
 			 unsigned int max);
+int regcache_drop_region(struct regmap *map, unsigned int min,
+			 unsigned int max);
 void regcache_cache_only(struct regmap *map, bool enable);
 void regcache_cache_bypass(struct regmap *map, bool enable);
 void regcache_mark_dirty(struct regmap *map);
 
+bool regmap_check_range_table(struct regmap *map, unsigned int reg,
+			      const struct regmap_access_table *table);
+
 int regmap_register_patch(struct regmap *map, const struct reg_default *regs,
 			  int num_regs);
 
@@ -411,6 +417,36 @@ bool regmap_reg_in_ranges(unsigned int reg,
 			  const struct regmap_range *ranges,
 			  unsigned int nranges);
 
+/**
+ * Description of an register field
+ *
+ * @reg: Offset of the register within the regmap bank
+ * @lsb: lsb of the register field.
+ * @reg: msb of the register field.
+ */
+struct reg_field {
+	unsigned int reg;
+	unsigned int lsb;
+	unsigned int msb;
+};
+
+#define REG_FIELD(_reg, _lsb, _msb) {		\
+				.reg = _reg,	\
+				.lsb = _lsb,	\
+				.msb = _msb,	\
+				}
+
+struct regmap_field *regmap_field_alloc(struct regmap *regmap,
+		struct reg_field reg_field);
+void regmap_field_free(struct regmap_field *field);
+
+struct regmap_field *devm_regmap_field_alloc(struct device *dev,
+		struct regmap *regmap, struct reg_field reg_field);
+void devm_regmap_field_free(struct device *dev,	struct regmap_field *field);
+
+int regmap_field_read(struct regmap_field *field, unsigned int *val);
+int regmap_field_write(struct regmap_field *field, unsigned int val);
+
 /**
  * Description of an IRQ for the generic regmap irq_chip.
  *
@@ -562,6 +598,13 @@ static inline int regcache_sync_region(struct regmap *map, unsigned int min,
 	return -EINVAL;
 }
 
+static inline int regcache_drop_region(struct regmap *map, unsigned int min,
+				       unsigned int max)
+{
+	WARN_ONCE(1, "regmap API is disabled");
+	return -EINVAL;
+}
+
 static inline void regcache_cache_only(struct regmap *map, bool enable)
 {
 	WARN_ONCE(1, "regmap API is disabled");
diff --git a/include/trace/events/regmap.h b/include/trace/events/regmap.h
index a43a2f67bd8e..23d561512f64 100644
--- a/include/trace/events/regmap.h
+++ b/include/trace/events/regmap.h
@@ -223,6 +223,29 @@ DEFINE_EVENT(regmap_async, regmap_async_complete_done,
 
 );
 
+TRACE_EVENT(regcache_drop_region,
+
+	TP_PROTO(struct device *dev, unsigned int from,
+		 unsigned int to),
+
+	TP_ARGS(dev, from, to),
+
+	TP_STRUCT__entry(
+		__string(       name,           dev_name(dev)   )
+		__field(	unsigned int,	from		)
+		__field(	unsigned int,	to		)
+	),
+
+	TP_fast_assign(
+		__assign_str(name, dev_name(dev));
+		__entry->from = from;
+		__entry->to = to;
+	),
+
+	TP_printk("%s %u-%u", __get_str(name), (unsigned int)__entry->from,
+		  (unsigned int)__entry->to)
+);
+
 #endif /* _TRACE_REGMAP_H */
 
 /* This part must be outside protection */