diff --git a/Documentation/ABI/testing/sysfs-class-pinmux b/Documentation/ABI/testing/sysfs-class-pinmux
new file mode 100644
index 0000000..c2ea843
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-pinmux
@@ -0,0 +1,11 @@
+What:		/sys/class/pinmux/.../name
+Date:		May 2011
+KernelVersion:	3.1
+Contact:	Linus Walleij <linus.walleij@linaro.org>
+Description:
+		Each pinmux directory will contain a field called
+		name. This holds a string identifying the pinmux for
+		display purposes.
+
+		NOTE: this will be empty if no suitable name is provided
+		by platform or pinmux drivers.
diff --git a/Documentation/pinctrl.txt b/Documentation/pinctrl.txt
new file mode 100644
index 0000000..c4b6f48
--- /dev/null
+++ b/Documentation/pinctrl.txt
@@ -0,0 +1,397 @@
+PINCTRL (PIN CONTROL) subsystem
+This document outlines the pin control subsystem in Linux
+
+This subsystem deals with:
+
+- Multiplexing of pins, pads, fingers (etc) see below for details
+
+The intention is to also deal with:
+
+- Software-controlled biasing and driving mode specific pins, such as
+  pull-up/down, open drain etc, load capacitance configuration when controlled
+  by software, etc.
+
+
+Top-level interface
+===================
+
+Definition of PIN:
+
+- PINS are equal to pads or fingers or whatever packaging output you want to
+  mux and these are denoted by unsigned integers in the range 0..MAX_INT. Every
+  pin on your system (or atleast every pin that can be muxed) should have a
+  unique number. The numberspace can span several chips if you have more chips
+  on your system that can be subject to muxing.
+
+All pins, pads, fingers, balls or other controllable units on the system shall
+be given a unique number in the global number space beginning on zero.
+
+All pins on the system need to be registered, typically by board code or a
+device tree. Board/machine code will #include <linux/pinctrl/machine.h>
+and use one of:
+
+  pinctrl_register_pins_sparse();
+  pinctrl_register_pins_dense();
+
+To register all the pins on the system. Both are supplied with a list of
+descriptor items, the difference is that the _dense version will also
+register anonymous pins for each "hole" in the pin map, from zero to the
+supplied extra argument giving the number of pins.
+
+Here is an example of a PGA (Pin Grid Array) chip seen from underneath:
+
+        A   B   C   D   E   F   G   H
+
+   8    o   o   o   o   o   o   o   o
+
+   7    o   o   o   o   o   o   o   o
+
+   6    o   o   o   o   o   o   o   o
+
+   5    o   o   o   o   o   o   o   o
+
+   4    o   o   o   o   o   o   o   o
+
+   3    o   o   o   o   o   o   o   o
+
+   2    o   o   o   o   o   o   o   o
+
+   1    o   o   o   o   o   o   o   o
+
+To register and name all the pins on this package we can do this in a board
+file:
+
+#include <linux/pinctrl/machine.h>
+
+const struct pinctrl_pin_desc __initdata my_pins[] = {
+      PINCTRL_PIN(0, "A1"),
+      PINCTRL_PIN(1, "A2"),
+      PINCTRL_PIN(2, "A3"),
+      ...
+      PINCTRL_PIN(61, "H6"),
+      PINCTRL_PIN(62, "H7"),
+      PINCTRL_PIN(63, "H8"),
+};
+
+int __init register_pins(void)
+{
+	pinctrl_register_pins_dense(&my_pins, ARRAY_SIZE(my_pins), 64);
+}
+
+Pins usually have fancier names than this. You can find these in the dataheet
+for your chip. Notice that the core machine.h file provides a fancy macro
+called PINCTRL_PIN() to create the struct entries.
+
+
+PINMUX interfaces
+=================
+
+These calls use the pinmux_* naming prefix.  No other calls should use that
+prefix.
+
+
+What is pinmuxing?
+==================
+
+Pinmux, also known as padmux, ballmux, alternate functions or mission modes
+is a way for chip vendors producing some kind of electrical packages to use
+a certain physical bin (ball, pad, finger, etc) for multiple mutually exclusive
+functions, depending on the application. By "application" in this context
+we usually mean a way of soldering or wiring the package into an electronic
+system, even though the framework makes it possible to handle also change the
+function at runtime.
+
+Here is an example of a PGA (Pin Grid Array) chip seen from underneath:
+
+        A   B   C   D   E   F   G   H
+      +---+
+   8  | o | o   o   o   o   o   o   o
+      |   |
+   7  | o | o   o   o   o   o   o   o
+      |   |
+   6  | o | o   o   o   o   o   o   o
+      +---+---+
+   5  | o | o | o   o   o   o   o   o
+      +---+---+               +---+
+   4    o   o   o   o   o   o | o | o
+                              |   |
+   3    o   o   o   o   o   o | o | o
+                              |   |
+   2    o   o   o   o   o   o | o | o
+                              |   |
+   1    o   o   o   o   o   o | o | o
+                              +---+
+
+This is not tetris. The game to think of is chess. Not all PGA/BGA packages
+are chessboard-like, big ones have "holes" in some arrangement according to
+different design patterns, but we're using this as a simple example. Of the
+pins you see some will be taken by things like a few VCC and GND to feed power
+to the chip, and quite a few will be taken by large ports like an external
+memory interface. The remaining pins will often be subject to pin multiplexing.
+
+The example 8x8 PGA package above will have pin numbers 0 thru 63 assigned to
+its physical pins. It will name the pins { A1, A2, A3 ... H6, H7, H8 } using
+pinctrl_register_pins_[sparse|dense]() and a suitable data set as shown
+earlier.
+
+In this 8x8 BGA package the pins { A8, A7, A6, A5 } can be used as an SPI port
+(these are four pins: CLK, RXD, TXD, FRM). In that case, pin B5 can be used as
+some general-purpose GPIO pin. However, in another setting, pins { A5, B5 } can
+be used as an I2C port (these are just two pins: SCL, SDA). Needless to say,
+we cannot use the SPI port and I2C port at the same time. However in the inside
+of the package the silicon performing the SPI logic can alternatively be routed
+out on pins { G4, G3, G2, G1 }.
+
+This way the silicon blocks present inside the chip can be multiplexed "muxed"
+out on different pin ranges. Often contemporary SoC (systems on chip) will
+contain several I2C, SPI, SDIO/MMC, etc silicon blocks that can be routed to
+different pins by pinmux settings.
+
+Since general-purpose I/O pins (GPIO) are typically always in shortage, it is
+common to be able to use almost any pin as a GPIO pin if it is not currently
+in use by some other I/O port.
+
+
+Pinmux conventions
+==================
+
+The purpose of the pinmux subsystem is to abstract and provide pinmux settings
+to the devices you choose to instantiate in your machine configuration. It is
+inspired by the clk, GPIO and regulator subsystems, so devices will request
+their mux setting, but it's also possible to request a single pin for e.g.
+GPIO.
+
+Definitions:
+
+- FUNCTIONS can be switched in and out by a driver residing with the pinmux
+  subsystem in the drivers/pinmux/* directory of the kernel. The pinmux driver
+  knows the possible functions. In the example above you can identify three
+  pinmux functions, two for spi and one for i2c.
+
+- FUNCTIONS are assumed to be enumerable from zero in a one-dimensional array.
+  In this case the array could be something like: { spi0-0, spi0-1, i2c0-0 }
+  for the three available settings. The knowledge of this one-dimensional array
+  and it's machine-specific particulars is kept inside the pinmux driver,
+  from the outside only these enumerators are known, and the driver core
+  can request the name or the list of pins belonging to a certain enumerator.
+
+- FUNCTIONS are MAPPED to a certain device by the board file, device tree or
+  similar machine setup configuration mechanism, similar to how regulators are
+  connected to devices, usually by name. In the example case we can define
+  that this particular machine shall use device spi0 with pinmux setting
+  spi0-1 and i2c0 on i2c0-1, something like the two-tuple:
+  { {spi0, spi0-1}, {i2c0, i2c0-1} }
+
+- FUNCTIONS are provided on a first-come first-serve basis, so if some other
+  device mux setting or GPIO pin request has already taken your physical pin,
+  you will be denied the use of it. To get (activate) a new setting, the old
+  one has to be put (deactivated) first.
+
+Sometimes the documentation and hardware registers will be oriented around
+pads (or "fingers") rather than pins - these are the soldering surfaces on the
+silicon inside the package, and may or may not match the actual number of
+pins/balls underneath the capsule. Pick some enumeration that makes sense to
+you. Define enumerators only for the pins you can control if that makes sense.
+
+
+Pinmux drivers
+==============
+
+The driver will for all calls be provided an offset pin number into its own
+pin range. If you have 2 chips with 8x8 pins, the first chips pins will have
+numbers 0 thru 63 and the second one pins 64 thru 127, but the driver for the
+second chip will be passed numbers in the range 0 thru 63 anyway, base offset
+subtracted.
+
+Pinmux drivers are required to supply a few callback functions, some are
+optional. Usually the enable() and disable() functions are implemented,
+writing values into some certain registers to activate a certain mux setting
+for a certain pin.
+
+A simple driver for the above example will work by setting bits 0, 1 or 2
+into some register mamed MUX, so it enumerates its available settings and
+their pin assignments, and expose them like this:
+
+#include <linux/pinctrl/pinmux.h>
+
+struct foo_pmx_func {
+	char *name;
+	const unsigned int *pins;
+	const unsigned num_pins;
+};
+
+static unsigned int spi0_0_pins[] = { 0, 8, 16, 24 };
+static unsigned int i2c0_pins[] = { 24, 25 };
+static unsigned int spi0_1_pins[] = { 38, 46, 54, 62 };
+
+static struct foo_pmx_func myfuncs[] = {
+	{
+		.name = "spi0-0",
+		.pins = spi0_0_pins,
+		.num_pins = ARRAY_SIZE(spi0_1_pins),
+	},
+	{
+		.name = "i2c0",
+		.pins = i2c0_pins,
+		.num_pins = ARRAY_SIZE(i2c0_pins),
+	},
+	{
+		.name = "spi0-1",
+		.pins = spi0_1_pins,
+		.num_pins = ARRAY_SIZE(spi0_1_pins),
+	},
+};
+
+int foo_list(struct pinmux_dev *pmxdev, unsigned selector)
+{
+	if (selector >= ARRAY_SIZE(myfuncs))
+		return -EINVAL;
+	return 0;
+}
+
+const char *foo_get_fname(struct pinmux_dev *pmxdev, unsigned selector)
+{
+	if (selector >= ARRAY_SIZE(myfuncs))
+		return NULL;
+	return myfuncs[selector].name;
+}
+
+static int foo_get_pins(struct pinmux_dev *pmxdev, unsigned selector,
+	   		unsigned ** const pins, unsigned * const num_pins)
+{
+	if (selector >= ARRAY_SIZE(myfuncs))
+		return -EINVAL;
+	*pins = myfuncs[selector].pins;
+	*num_pins = myfuncs[selector].num_pins;
+	return 0;
+}
+
+
+int foo_enable(struct pinmux_dev *pmxdev, unsigned selector)
+{
+	if (selector < ARRAY_SIZE(myfuncs))
+		write((read(MUX)|(1<<selector)), MUX)
+		return 0;
+	}
+	return -EINVAL;
+}
+
+int foo_disable(struct pinmux_dev *pmxdev, unsigned selector)
+{
+	if (selector < ARRAY_SIZE(myfuncs))
+		write((read(MUX) & ~(1<<selector)), MUX)
+		return 0;
+	}
+	return -EINVAL;
+}
+
+struct pinmux_ops ops = {
+	.list_functions = foo_list,
+	.get_function_name = foo_get_fname,
+	.get_function_pins = foo_get_pins,
+	.enable = foo_enable,
+	.disable = foo_disable,
+};
+
+Now the able reader will say: "wait - the driver needs to make sure it
+can set this and that bit at the same time, because else it will collide
+and wreak havoc in my electronics, and make sure noone else is using the
+other setting that it's incompatible with".
+
+In the example activating muxing 0 and 1 at the same time setting bits
+0 and 1, uses one pin in common so they would collide.
+
+The beauty of the pinmux subsystem is that since it keeps track of all
+pins and who is using them, it will already have denied an impossible
+request like that, so the driver does not need to worry about such
+things - when it gets a selector passed in, the pinmux subsystem makes
+sure no other device or GPIO assignment is already using the selected
+pins.
+
+The above functions are mandatory to implement for a pinmux driver.
+
+The function list could become long, especially if you can convert every
+individual pin into a GPIO pin independent of any other pins, then your
+function array can become 64 entries for each GPIO setting and then the
+device functions. For this reason there is an additional function you
+can implement to enable only GPIO on an individual pin: gpio_enable().
+
+
+Pinmux board/machine configuration
+==================================
+
+Boards and machines define how a certain complete running system is put
+together, including how GPIOs and devices are muxed, how regulators are
+constrained and how the clock tree looks. Of course pinmux settings are also
+part of this.
+
+A pinmux config for a machine looks pretty much like a simple regulator
+configuration, so for the example array above we want to enable i2c and
+spi on the second function mapping:
+
+#include <linux/pinctrl/machine.h>
+
+static struct pinmux_map pmx_mapping[] = {
+	{
+		.function = "spi0-1",
+		.dev_name = "foo-spi.0",
+	},
+	{
+		.function = "i2c0",
+		.dev_name = "foo-i2c.0",
+	},
+};
+
+Since the above construct is pretty common there is a helper macro to make
+it even more compact:
+
+static struct pinmux_map pmx_mapping[] = {
+       PINMUX_MAP("spi0-1", "foo-spi.0"),
+       PINMUX_MAP("i2c0", "foo-i2c.0"),
+};
+
+The dev_name here matches to the unique device name that can be used to look
+up the device struct (just like with clockdev or regulators). The function name
+must match a function provided by the pinmux driver handling this pin range.
+You register this pinmux mapping to the pinmux subsystem by simply:
+
+       ret = pinmux_register_mappings(&pmx_mapping, ARRAY_SIZE(pmx_mapping));
+
+
+Pinmux requests from drivers
+============================
+
+A driver may request a certain mux to be activated, usually just the default
+mux like this:
+
+#include <linux/pinctrl/pinmux.h>
+
+foo_probe()
+{
+	/* Allocate a state holder named "state" etc */
+	struct pinmux pmx;
+
+	pmx = pinmux_get(&device, NULL);
+	if IS_ERR(pmx)
+		return PTR_ERR(pmx);
+	pinmux_enable(pmx);
+
+	state->pmx = pmx;
+}
+
+foo_remove()
+{
+	pinmux_disable(state->pmx);
+	pinmux_put(state->pmx);
+}
+
+If you want a specific mux setting and not just the first one found for this
+device you can specify a specific mux setting, for example in the above example
+the second i2c0 setting: pinmux_get(&device, "spi0-2");
+
+This get/enable/disable/put sequence can just as well be handled by bus drivers
+if you don't want each and every driver to handle it and you know the
+arrangement on your bus.
+
+The pins are allocated for your device when you issue the pinmux_get() call,
+after this you should be able to see this in the debugfs listing of all pins.
diff --git a/MAINTAINERS b/MAINTAINERS
index 29801f7..5caea5a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4933,6 +4933,11 @@ L:	linux-mtd@lists.infradead.org
 S:	Maintained
 F:	drivers/mtd/devices/phram.c
 
+PINMUX SUBSYSTEM
+M:	Linus Walleij <linus.walleij@linaro.org>
+S:	Maintained
+F:	drivers/pinmux/
+
 PKTCDVD DRIVER
 M:	Peter Osterlund <petero2@telia.com>
 S:	Maintained
diff --git a/drivers/Kconfig b/drivers/Kconfig
index 3bb154d..6998d78 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -56,6 +56,10 @@ source "drivers/pps/Kconfig"
 
 source "drivers/ptp/Kconfig"
 
+# pinctrl before gpio - gpio drivers may need it
+
+source "drivers/pinctrl/Kconfig"
+
 source "drivers/gpio/Kconfig"
 
 source "drivers/w1/Kconfig"
diff --git a/drivers/Makefile b/drivers/Makefile
index 09f3232..a590a01 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -5,6 +5,8 @@
 # Rewritten to use lists instead of if-statements.
 #
 
+# GPIO must come after pinctrl as gpios may need to mux pins etc
+obj-y				+= pinctrl/
 obj-y				+= gpio/
 obj-$(CONFIG_PCI)		+= pci/
 obj-$(CONFIG_PARISC)		+= parisc/
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
new file mode 100644
index 0000000..8050fdf
--- /dev/null
+++ b/drivers/pinctrl/Kconfig
@@ -0,0 +1,29 @@
+#
+# PINCTRL infrastructure and drivers
+#
+
+menuconfig PINCTRL
+	bool "PINCTRL Support"
+	depends on SYSFS && EXPERIMENTAL
+	help
+	  This enables the PINCTRL subsystem for controlling pins
+	  on chip packages, for example multiplexing pins on primarily
+	  PGA and BGA packages for systems on chip.
+
+	  If unsure, say N.
+
+if PINCTRL
+
+config DEBUG_PINCTRL
+	bool "Debug PINCTRL calls"
+	depends on DEBUG_KERNEL
+	help
+	  Say Y here to add some extra checks and diagnostics to PINCTRL calls.
+
+config PINMUX_U300
+	bool "U300 pinmux driver"
+	depends on ARCH_U300
+	help
+	  Say Y here to enable the U300 pinmux driver
+
+endif
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
new file mode 100644
index 0000000..44d8933
--- /dev/null
+++ b/drivers/pinctrl/Makefile
@@ -0,0 +1,6 @@
+# generic pinmux support
+
+ccflags-$(CONFIG_DEBUG_PINMUX)	+= -DDEBUG
+
+obj-$(CONFIG_PINCTRL)		+= core.o
+obj-$(CONFIG_PINMUX_U300)	+= pinmux-u300.o
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
new file mode 100644
index 0000000..8fd1437
--- /dev/null
+++ b/drivers/pinctrl/core.c
@@ -0,0 +1,1028 @@
+/*
+ * Core driver for the pinmux subsystem
+ *
+ * Copyright (C) 2011 ST-Ericsson SA
+ * Written on behalf of Linaro for ST-Ericsson
+ * Based on bits of regulator core, gpio core and clk core
+ *
+ * Author: Linus Walleij <linus.walleij@linaro.org>
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ */
+#define pr_fmt(fmt) "pinctrl core: " fmt
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/radix-tree.h>
+#include <linux/err.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/spinlock.h>
+#include <linux/sysfs.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/pinctrl/machine.h>
+#include <linux/pinctrl/pinmux.h>
+
+/* Global list of pinmuxes */
+static DEFINE_MUTEX(pinmux_list_mutex);
+static LIST_HEAD(pinmux_list);
+
+/* Global list of pinmux devices */
+static DEFINE_MUTEX(pinmuxdev_list_mutex);
+static LIST_HEAD(pinmuxdev_list);
+
+/**
+ * struct pin_desc - pin descriptor for each physical pin in the arch
+ * @pmxdev: corresponding pinmux device
+ * @requested: whether the pin is already requested by pinmux or not
+ * @name: a name for the pin, e.g. the name of the pin/pad/finger on a
+ *	datasheet or such
+ * @function: a named muxing function for the pin that will be passed to
+ *	subdrivers and shown in debugfs etc
+ */
+struct pin_desc {
+	struct pinmux_dev *pmxdev;
+	bool	requested;
+	char	name[16];
+	char	function[16];
+};
+/* Global lookup of per-pin descriptors, one for each physical pin */
+static DEFINE_SPINLOCK(pin_desc_tree_lock);
+static RADIX_TREE(pin_desc_tree, GFP_KERNEL);
+static unsigned int num_pins = 0;
+
+/**
+ * struct pinmux - per-device pinmux state holder
+ * @node: global list node - only for internal use
+ * @dev: the device using this pinmux
+ * @pmxdev: the pinmux device controlling this pinmux
+ * @map: corresponding pinmux map active for this pinmux setting
+ * @usecount: the number of active users of this mux setting, used to keep
+ *	track of nested use cases
+ * @pins: an array of discrete physical pins used in this mapping, taken
+ *	from the global pin enumeration space (copied from pinmux map)
+ * @num_pins: the number of pins in this mapping array, i.e. the number of
+ *	elements in .pins so we can iterate over that array (copied from
+ *	pinmux map)
+ * @pmxdev: pinmux device handling this pinmux
+ * @pmxdev_selector: the selector for the pinmux device handling this pinmux
+ * @mutex: a lock for the pinmux state holder
+ */
+struct pinmux {
+	struct list_head node;
+	struct device *dev;
+	struct pinmux_map const *map;
+	unsigned usecount;
+	struct pinmux_dev *pmxdev;
+	unsigned pmxdev_selector;
+	struct mutex mutex;
+};
+
+int pin_is_valid(int pin)
+{
+	return pin >= 0 && pin < num_pins;
+}
+EXPORT_SYMBOL_GPL(pin_is_valid);
+
+static ssize_t pinmux_name_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct pinmux_dev *pmxdev = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%s\n", pmxdev_get_name(pmxdev));
+}
+
+static struct device_attribute pinmux_dev_attrs[] = {
+	__ATTR(name, 0444, pinmux_name_show, NULL),
+	__ATTR_NULL,
+};
+
+static void pinmux_dev_release(struct device *dev)
+{
+	struct pinmux_dev *pmxdev = dev_get_drvdata(dev);
+	kfree(pmxdev);
+}
+
+static struct class pinmux_class = {
+	.name = "pinmux",
+	.dev_release = pinmux_dev_release,
+	.dev_attrs = pinmux_dev_attrs,
+};
+
+/* Deletes a range of pin descriptors */
+static void pinctrl_free_pindescs(struct pinctrl_pin_desc const *pins,
+				  unsigned num_pins)
+{
+	int i;
+
+	for (i = 0; i < num_pins; i++) {
+		struct pin_desc *pindesc;
+
+		spin_lock(&pin_desc_tree_lock);
+		pindesc = radix_tree_lookup(&pin_desc_tree, pins[i].number);
+		if (pindesc != NULL) {
+			radix_tree_delete(&pin_desc_tree, pins[i].number);
+			num_pins --;
+		}
+		spin_unlock(&pin_desc_tree_lock);
+		kfree(pindesc);
+	}
+}
+
+static int pinctrl_register_one_pin(unsigned number, const char *name)
+{
+	struct pin_desc *pindesc;
+
+	spin_lock(&pin_desc_tree_lock);
+	pindesc = radix_tree_lookup(&pin_desc_tree, number);
+	spin_unlock(&pin_desc_tree_lock);
+
+	if (pindesc != NULL) {
+		pr_err("pin %d already registered\n", number);
+		return -EINVAL;
+	}
+
+	pindesc = kzalloc(sizeof(*pindesc), GFP_KERNEL);
+	if (pindesc == NULL)
+		return -ENOMEM;
+
+	/* Copy optional basic pin info */
+	if (name) {
+		strncpy(pindesc->name, name, 16);
+		pindesc->name[15] = '\0';
+	}
+
+	spin_lock(&pin_desc_tree_lock);
+	radix_tree_insert(&pin_desc_tree, number, pindesc);
+	num_pins ++;
+	spin_unlock(&pin_desc_tree_lock);
+	return 0;
+}
+
+/* Passing in 0 num_pins means "sparse" */
+static int pinctrl_register_pins(struct pinctrl_pin_desc const *pins,
+				 unsigned num_descs, unsigned num_pins)
+{
+	unsigned i;
+	int ret = 0;
+
+	for (i = 0; i < num_descs; i++) {
+		ret = pinctrl_register_one_pin(pins[i].number, pins[i].name);
+		if (ret)
+			return ret;
+	}
+
+	if (num_pins == 0)
+		return 0;
+
+	/*
+	 * If we are registerering dense pinlists, fill in all holes with
+	 * anonymous pins.
+	 */
+	for (i = 0; i < num_pins; i++) {
+		char pinname[16];
+		struct pin_desc *pindesc;
+
+		spin_lock(&pin_desc_tree_lock);
+		pindesc = radix_tree_lookup(&pin_desc_tree, i);
+		spin_unlock(&pin_desc_tree_lock);
+		/* Already registered this one, take next */
+		if (pindesc)
+			continue;
+
+		snprintf(pinname, 15, "anonymous %u", i);
+		pinname[15] = '\0';
+
+		ret = pinctrl_register_one_pin(i, pinname);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+/**
+ * pinctrl_register_pins_sparse() - register a range of pins for a
+ *	board/machine with potential holes in the pin map. The pins in
+ *	the holes will not be usable.
+ * @pins: a range of pins to register
+ * @num_descs: the number of pins descriptors passed in through the previous
+ *	pointer
+ */
+int pinctrl_register_pins_sparse(struct pinctrl_pin_desc const *pins,
+			  unsigned num_descs)
+{
+	int ret;
+
+	ret = pinctrl_register_pins(pins, num_descs, 0);
+	if (ret)
+		pinctrl_free_pindescs(pins, num_descs);
+	return ret;
+
+}
+EXPORT_SYMBOL_GPL(pinctrl_register_pins);
+
+/**
+ * pinctrl_register_pins_dense() - register a range of pins for a
+ *	board/machine, if there are holes in the pin map, they will be
+ *	allocated by anonymous pins.
+ * @pins: a range of pins to register
+ * @num_descs: the number of pins descriptors passed in through the previous
+ *	pointer
+ * @num_pins: the total number of pins including holes in the pin map and
+ *	any "air" at the end of the map, all pins from 0 to this number
+ *	will be allocated, the ones that does not have descriptors passed
+ *	in will be marked "anonymous"
+ */
+int pinctrl_register_pins_dense(struct pinctrl_pin_desc const *pins,
+				 unsigned num_descs, unsigned num_pins)
+{
+	int ret;
+	unsigned i;
+
+	ret = pinctrl_register_pins(pins, num_descs, num_pins);
+	if (ret) {
+		for (i = 0; i < num_pins; i++) {
+			struct pin_desc *pindesc;
+
+			spin_lock(&pin_desc_tree_lock);
+			pindesc = radix_tree_lookup(&pin_desc_tree, i);
+			if (pindesc != NULL) {
+				radix_tree_delete(&pin_desc_tree, i);
+				num_pins --;
+			}
+			spin_unlock(&pin_desc_tree_lock);
+			kfree(pindesc);
+		}
+	}
+	return ret;
+}
+EXPORT_SYMBOL_GPL(pinctrl_register_pins_sparse);
+
+/**
+ * pin_request() - request a single pin to be muxed in, typically for GPIO
+ * @pin: the pin number in the global pin space
+ * @function: a functional name to give to this pin, passed to the driver
+ *	so it knows what function to mux in, e.g. the string "gpioNN"
+ *	means that you want to mux in the pin for use as GPIO number NN
+ * @gpio: if this request concerns a single GPIO pin
+ */
+static int pin_request(int pin, const char *function, bool gpio)
+{
+	struct pin_desc *desc;
+	struct pinmux_dev *pmxdev;
+	const struct pinmux_ops *ops;
+	int status = -EINVAL;
+	unsigned long flags;
+
+	pr_debug("request pin %d for %s\n", pin, function);
+	if (!pin_is_valid(pin)) {
+		pr_err("pin is invalid\n");
+		return -EINVAL;
+	}
+
+	if (!function) {
+		pr_err("no function name given\n");
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&pin_desc_tree_lock, flags);
+	desc = radix_tree_lookup(&pin_desc_tree, pin);
+	if (desc == NULL) {
+		pr_err("pin is not registered so it cannot be requested\n");
+		goto out;
+	}
+	pmxdev = desc->pmxdev;
+	if (desc->requested) {
+		pr_err("pin already requested\n");
+		goto out;
+	}
+	if (!pmxdev) {
+		pr_warn("no pinmux device is handling pin %d\n", pin);
+		goto out;
+	}
+	ops = pmxdev->desc->ops;
+
+	/* Let each pin increase references to this module */
+	if (!try_module_get(pmxdev->owner)) {
+		pr_err("could not increase module refcount for pin %d\n", pin);
+		status = -EINVAL;
+		goto out;
+	}
+
+	/*
+	 * If there is no kind of request function for the pin we just assume
+	 * we got it by default and proceed.
+	 */
+	if (gpio && ops->gpio_request_enable)
+		/* This requests and enables a single GPIO pin */
+		status = ops->gpio_request_enable(pmxdev,
+						  pin - pmxdev->desc->base);
+	else if (ops->request)
+		status = ops->request(pmxdev,
+				      pin - pmxdev->desc->base);
+	else
+		status = 0;
+
+	if (status) {
+		pr_err("->request on device %s failed "
+		       "for pin %d (offset %d)\n",
+		       pmxdev->desc->name, pin,
+		       pin - pmxdev->desc->base);
+		goto out;
+	}
+
+	desc->requested = true;
+	strncpy(desc->function, function, 16);
+	desc->function[15] = '\0';
+
+out:
+	spin_unlock_irqrestore(&pin_desc_tree_lock, flags);
+	if (status)
+		pr_err("pin-%d (%s) status %d\n",
+		       pin, function ? : "?", status);
+
+	return status;
+}
+
+/**
+ * pin_free() - release a single muxed in pin so something else can be muxed in
+ *	instead
+ * @pin: the pin to free
+ */
+static void pin_free(int pin)
+{
+	struct pin_desc *desc;
+	struct pinmux_dev *pmxdev;
+	unsigned long flags;
+
+	if (!pin_is_valid(pin))
+		return;
+
+	spin_lock_irqsave(&pin_desc_tree_lock, flags);
+	desc = radix_tree_lookup(&pin_desc_tree, pin);
+	if (desc == NULL) {
+		pr_err("pin is not registered so it cannot be freed\n");
+		goto out;
+	}
+	pmxdev = desc->pmxdev;
+	if (pmxdev) {
+		const struct pinmux_ops *ops = pmxdev->desc->ops;
+
+		if (ops->free)
+			ops->free(pmxdev, pin - pmxdev->desc->base);
+	}
+	desc->requested = false;
+	desc->function[0] = '\0';
+	module_put(pmxdev->owner);
+out:
+	spin_unlock_irqrestore(&pin_desc_tree_lock, flags);
+}
+
+/**
+ * pinmux_request_gpio() - request a single pin to be muxed in to be used
+ *	as a GPIO pin
+ * @pin: the pin to mux in as GPIO
+ * @gpio: the corresponding GPIO pin number
+ */
+int pinmux_request_gpio(int pin, unsigned gpio)
+{
+	char gpiostr[16];
+
+	snprintf(gpiostr, 15, "gpio%d", gpio);
+	return pin_request(pin, gpiostr, true);
+}
+EXPORT_SYMBOL_GPL(pinmux_request_gpio);
+
+/**
+ * pinmux_free_gpio() - free a single pin, currently muxed in to be used
+ *	as a GPIO pin
+ * @pin: the pin to mux out from GPIO
+ */
+void pinmux_free_gpio(int pin)
+{
+	return pin_free(pin);
+}
+EXPORT_SYMBOL_GPL(pinmux_free_gpio);
+
+int pinmux_register_mappings(struct pinmux_map const *maps, unsigned num_maps)
+{
+	int ret = 0;
+	int i;
+
+	pr_debug("add %d functions\n", num_maps);
+	for (i = 0; i < num_maps; i++) {
+		struct pinmux *pmx;
+
+		/* Sanity check the mapping */
+		if (!maps[i].function) {
+			pr_err("failed to register map %d - no function ID given\n", i);
+			ret = -EINVAL;
+			goto out;
+		}
+		if (!maps[i].dev && !maps[i].dev_name) {
+			pr_err("failed to register map %d - no device or device name given\n", i);
+			ret = -EINVAL;
+			goto out;
+		}
+
+		/*
+		 * create the state cookie holder struct pinmux for each
+		 * mapping, this is what consumers will get when requesting
+		 * a pinmux handle with pinmux_get()
+		 */
+		pmx = kzalloc(sizeof(struct pinmux), GFP_KERNEL);
+		if (pmx == NULL) {
+			ret = -ENOMEM;
+			goto out;
+		}
+		mutex_init(&pmx->mutex);
+		pmx->map = &maps[i];
+
+		/* Add the pinmux */
+		mutex_lock(&pinmux_list_mutex);
+		list_add(&pmx->node, &pinmux_list);
+		mutex_unlock(&pinmux_list_mutex);
+		pr_debug("add function %s\n", maps[i].function);
+	}
+
+out:
+	return ret;
+}
+
+/**
+ * acquire_pins() - acquire all the pins for a certain funcion on a certain
+ *	pinmux device
+ * @pmxdev: the device to take the function on
+ * @selector: the selector to acquire the pins for
+ */
+int acquire_pins(struct pinmux_dev *pmxdev, unsigned selector)
+{
+	const struct pinmux_ops *ops = pmxdev->desc->ops;
+	unsigned *pins;
+	unsigned num_pins;
+	const char *func = ops->get_function_name(pmxdev, selector);
+	int ret;
+	int i;
+
+	ret = ops->get_function_pins(pmxdev, selector, &pins, &num_pins);
+	if (ret)
+		return ret;
+
+	/* Try to allocate all pins in this pinmux map, one by one */
+	for (i = 0; i < num_pins; i++) {
+		ret = pin_request(pins[i], func, false);
+		if (ret) {
+			pr_err("could not get pin %d for function %s "
+			       "on device %s - conflicting mux mappings?\n",
+			       pins[i], func ? : "(undefined)",
+			       pmxdev->desc->name);
+			/* On error release all taken pins */
+			i--; /* this pin just failed */
+			for (; i >= 0; i--)
+				pin_free(pins[i]);
+			return -ENODEV;
+		}
+	}
+	return 0;
+}
+
+/**
+ * pinmux_get() - retrieves the pinmux for a certain device
+ * @dev: the device to get the pinmux for
+ * @func: an optional mux name or NULL, the name is only needed
+ *	if a single device has multiple pinmux settings (i.e. if the
+ *	same device can be muxed out on different sets of pins) or if
+ *	you need an anonymous pinmux (not tied to any specific device)
+ */
+struct pinmux *pinmux_get(struct device *dev, const char *func)
+{
+	struct pinmux_map const *map = NULL;
+	struct pinmux_dev *pmxdev = NULL;
+	const char *devname = NULL;
+	struct pinmux *pmx;
+	bool found = false;
+	int ret = -ENODEV;
+
+	/* We must have dev or ID or both */
+	if (!dev && !func)
+		return ERR_PTR(-EINVAL);
+
+	mutex_lock(&pinmux_list_mutex);
+
+	if (dev)
+		devname = dev_name(dev);
+
+	/* Locate the pinmux map */
+	list_for_each_entry(pmx, &pinmux_list, node) {
+		map = pmx->map;
+
+		/* If an function is given, it MUST match */
+		if ((func != NULL) && strcmp(map->function, func))
+			continue;
+
+		/*
+		 * This is for the case where no device name is given, we
+		 * already know that the function name matches from above
+		 * code.
+		 */
+		if (!map->dev_name && (func != NULL)) {
+			found = true;
+			break;
+		}
+
+		/* If the mapping has a device set up it must match */
+		if (map->dev_name &&
+		    (!devname || !strcmp(map->dev_name, devname))) {
+			/* MATCH! */
+			found = true;
+			break;
+		}
+	}
+
+	mutex_unlock(&pinmux_list_mutex);
+
+	if (!found) {
+		pr_err("could not find mux map for device %s, ID %s\n",
+		       devname ? : "(anonymous)", func ? : "(undefined)");
+		goto out;
+	}
+
+	/* Make sure that noone else is using this function mapping */
+	mutex_lock(&pmx->mutex);
+	if (pmx->dev) {
+		if (pmx->dev != dev) {
+			mutex_unlock(&pmx->mutex);
+			pr_err("mapping already in use device %s, ID %s\n",
+			       devname ? : "(anonymous)", func ? : "(undefined)");
+			goto out;
+		} else {
+			/* We already fetched this and requested pins */
+			mutex_unlock(&pmx->mutex);
+			ret = 0;
+			goto out;
+		}
+	}
+	mutex_unlock(&pmx->mutex);
+
+
+	/*
+	 * Iterate over the drivers so see which ones that may handle this
+	 * specific muxing. NOTE: there can be only one as of now.
+	 */
+	list_for_each_entry(pmxdev, &pinmuxdev_list, node) {
+		const struct pinmux_ops *ops = pmxdev->desc->ops;
+		unsigned selector = 0;
+
+		/* See if this pmxdev has this function */
+		while (ops->list_functions(pmxdev, selector) >= 0) {
+			const char *fname = ops->get_function_name(pmxdev,
+								   selector);
+
+			if (!strcmp(map->function, fname)) {
+				ret = acquire_pins(pmxdev, selector);
+				if (ret)
+					goto out;
+				/* Found it! */
+				mutex_lock(&pmx->mutex);
+				pmx->dev = dev;
+				pmx->pmxdev = pmxdev;
+				pmx->pmxdev_selector = selector;
+				mutex_unlock(&pmx->mutex);
+				ret = 0;
+				goto out;
+			}
+			selector++;
+		}
+	}
+	/* We couldn't find the driver for this pinmux */
+	ret = -ENODEV;
+
+out:
+	if (ret)
+		pmx = ERR_PTR(ret);
+
+	return pmx;
+}
+EXPORT_SYMBOL_GPL(pinmux_get);
+
+/**
+ * pinmux_put() - release a previously claimed pinmux
+ * @pmx: a pinmux previously claimed by pinmux_get()
+ */
+void pinmux_put(struct pinmux *pmx)
+{
+	if (pmx == NULL)
+		return;
+	mutex_lock(&pmx->mutex);
+	if (pmx->usecount)
+		pr_warn("pinmux: releasing pinmux with active users!\n");
+	pmx->dev = NULL;
+	pmx->pmxdev = NULL;
+	pmx->pmxdev_selector = 0;
+	mutex_unlock(&pmx->mutex);
+}
+EXPORT_SYMBOL_GPL(pinmux_put);
+
+/**
+ * pinmux_enable() - enable a certain pinmux setting
+ * @pmx: the pinmux to enable, previously claimed by pinmux_get()
+ */
+int pinmux_enable(struct pinmux *pmx)
+{
+	int ret = 0;
+
+	if (pmx == NULL)
+		return -EINVAL;
+	mutex_lock(&pmx->mutex);
+	if (pmx->usecount++ == 0) {
+		struct pinmux_dev *pmxdev = pmx->pmxdev;
+		const struct pinmux_ops *ops = pmxdev->desc->ops;
+
+		ret = ops->enable(pmxdev, pmx->pmxdev_selector);
+		if (ret)
+			pmx->usecount--;
+	}
+	mutex_unlock(&pmx->mutex);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(pinmux_enable);
+
+/**
+ * pinmux_disable() - disable a certain pinmux setting
+ * @pmx: the pinmux to disable, previously claimed by pinmux_get()
+ */
+void pinmux_disable(struct pinmux *pmx)
+{
+	if (pmx == NULL)
+		return;
+
+	mutex_lock(&pmx->mutex);
+	if (--pmx->usecount == 0) {
+		struct pinmux_dev *pmxdev = pmx->pmxdev;
+		const struct pinmux_ops *ops = pmxdev->desc->ops;
+
+		ops->disable(pmxdev, pmx->pmxdev_selector);
+	}
+	mutex_unlock(&pmx->mutex);
+}
+EXPORT_SYMBOL_GPL(pinmux_disable);
+
+/**
+ * pinmux_config() - configure a certain pinmux setting
+ * @pmx: the pinmux setting to configure
+ * @param: the parameter to configure
+ * @data: extra data to be passed to the configuration, also works as a
+ *	pointer to data returned from the function on success
+ */
+int pinmux_config(struct pinmux *pmx, u16 param, unsigned long *data)
+{
+	struct pinmux_dev *pmxdev;
+	const struct pinmux_ops *ops;
+	int ret = 0;
+
+	if (pmx == NULL)
+		return -ENODEV;
+
+	pmxdev = pmx->pmxdev;
+	ops = pmxdev->desc->ops;
+
+	/* This operation is not mandatory to implement */
+	if (ops->config) {
+		mutex_lock(&pmx->mutex);
+		ret = ops->config(pmxdev, pmx->pmxdev_selector, param, data);
+		mutex_unlock(&pmx->mutex);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(pinmux_config);
+
+static void pinmux_unclaim_pindescs(int first, int last)
+{
+	int i;
+
+	for (i = first; i < last; i++) {
+		struct pin_desc *pindesc;
+
+		spin_lock(&pin_desc_tree_lock);
+		pindesc = radix_tree_lookup(&pin_desc_tree, i);
+		spin_unlock(&pin_desc_tree_lock);
+		if (pindesc) {
+			/* Mark as unclaimed by drivers or functions */
+			pindesc->pmxdev = NULL;
+			pindesc->function[0] = '\0';
+		}
+	}
+}
+
+/* Helper to claim the individual descs for each pin on a pinmux device */
+static int pinmux_claim_pindescs(struct pinmux_desc *pmxdesc,
+				 struct pinmux_dev *pmxdev)
+{
+	int i;
+
+	/* Put self as handler of the indicated pin range */
+	for (i = pmxdesc->base; i < (pmxdesc->base + pmxdesc->npins); i++) {
+		struct pin_desc *pindesc;
+
+		/* Check that none of the pins are already there */
+		spin_lock(&pin_desc_tree_lock);
+		pindesc = radix_tree_lookup(&pin_desc_tree, i);
+		spin_unlock(&pin_desc_tree_lock);
+		if (pindesc == NULL) {
+			dev_err(&pmxdev->dev, "pin %d is not registered, yet "
+				"attempted to add pinmux driver for it\n", i);
+			return -EINVAL;
+		}
+		if (pindesc->pmxdev != NULL) {
+			dev_err(&pmxdev->dev, "pin %d taken by other pinmux "
+				"device\n", i);
+			return -EINVAL;
+		}
+		pindesc->pmxdev = pmxdev;
+	}
+	return 0;
+}
+
+/**
+ * pinmux_register() - register a pinmux device
+ * @pmxdesc: descriptor for this pinmux
+ * @dev: parent device for this pinmux
+ * @driver_data: private pinmux data for this pinmux
+ */
+struct pinmux_dev *pinmux_register(struct pinmux_desc *pmxdesc,
+				   struct device *dev, void *driver_data)
+{
+	static atomic_t pinmux_no = ATOMIC_INIT(0);
+	struct pinmux_dev *pmxdev;
+	int ret;
+
+	if (pmxdesc == NULL)
+		return ERR_PTR(-EINVAL);
+	if (pmxdesc->name == NULL || pmxdesc->ops == NULL)
+		return ERR_PTR(-EINVAL);
+	/* These functions are mandatory */
+	if (!pmxdesc->ops->list_functions ||
+	    !pmxdesc->ops->get_function_name ||
+	    !pmxdesc->ops->enable ||
+	    !pmxdesc->ops->disable)
+		return ERR_PTR(-EINVAL);
+
+	pmxdev = kzalloc(sizeof(struct pinmux_dev), GFP_KERNEL);
+	if (pmxdev == NULL)
+		return ERR_PTR(-ENOMEM);
+
+	mutex_lock(&pinmuxdev_list_mutex);
+	pmxdev->owner = pmxdesc->owner;
+	pmxdev->desc = pmxdesc;
+	pmxdev->driver_data = driver_data;
+
+	/* Register device with sysfs */
+	pmxdev->dev.class = &pinmux_class;
+	pmxdev->dev.parent = dev;
+	dev_set_name(&pmxdev->dev, "pinmux.%d",
+		     atomic_inc_return(&pinmux_no) - 1);
+	ret = device_register(&pmxdev->dev);
+	if (ret != 0) {
+		put_device(&pmxdev->dev);
+		kfree(pmxdev);
+		goto out_err;
+	}
+	dev_set_drvdata(&pmxdev->dev, pmxdev);
+
+	ret = pinmux_claim_pindescs(pmxdesc, pmxdev);
+	if (ret)
+		goto out_err;
+
+	list_add(&pmxdev->node, &pinmuxdev_list);
+	mutex_unlock(&pinmuxdev_list_mutex);
+	return pmxdev;
+
+out_err:
+	mutex_unlock(&pinmuxdev_list_mutex);
+	put_device(&pmxdev->dev);
+	kfree(pmxdev);
+	return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(pinmux_register);
+
+/**
+ * pinmux_unregister() - unregister pinmux
+ * @pmxdev: pinmux to unregister
+ *
+ * Called by pinmux drivers to unregister a pinmux.
+ */
+void pinmux_unregister(struct pinmux_dev *pmxdev)
+{
+	if (pmxdev == NULL)
+		return;
+
+	mutex_lock(&pinmuxdev_list_mutex);
+	list_del(&pmxdev->node);
+	device_unregister(&pmxdev->dev);
+	mutex_unlock(&pinmuxdev_list_mutex);
+	pinmux_unclaim_pindescs(pmxdev->desc->base,
+				pmxdev->desc->base + pmxdev->desc->npins);
+}
+EXPORT_SYMBOL_GPL(pinmux_unregister);
+
+#ifdef CONFIG_DEBUG_FS
+
+static int pins_show(struct seq_file *s, void *what)
+{
+	unsigned pin;
+
+	seq_puts(s, "Pins:\n");
+	spin_lock(&pin_desc_tree_lock);
+	for (pin = 0; pin < num_pins; pin++) {
+		struct pin_desc *desc;
+
+		desc = radix_tree_lookup(&pin_desc_tree, pin);
+
+		seq_printf(s, "pin %d (%s)\n", pin,
+			   desc->name ? desc->name : "(unnamed)");
+	}
+	spin_unlock(&pin_desc_tree_lock);
+
+	return 0;
+}
+
+static int pinmux_devices_show(struct seq_file *s, void *what)
+{
+	struct pinmux_dev *pmxdev;
+
+	seq_puts(s, "Available pinmux settings per pinmux device:\n");
+	list_for_each_entry(pmxdev, &pinmuxdev_list, node) {
+		const struct pinmux_ops *ops = pmxdev->desc->ops;
+		unsigned selector = 0;
+
+		seq_printf(s, "Device %s:\n", pmxdev->desc->name);
+		while (ops->list_functions(pmxdev, selector) >= 0) {
+			unsigned *pins;
+			unsigned num_pins;
+			const char *func = ops->get_function_name(pmxdev,
+								  selector);
+			int ret;
+			int i;
+
+			ret = ops->get_function_pins(pmxdev, selector,
+						     &pins, &num_pins);
+
+			if (ret)
+				seq_printf(s, "%s [ERROR GETTING PINS]\n",
+					   func);
+
+			else {
+				seq_printf(s, "function: %s, pins = [ ", func);
+				for (i = 0; i < num_pins; i++)
+					seq_printf(s, "%d ", pins[i]);
+				seq_puts(s, "]\n");
+			}
+
+			selector++;
+
+		}
+	}
+
+	return 0;
+}
+
+static int pinmux_maps_show(struct seq_file *s, void *what)
+{
+	struct pinmux *pmx;
+	const struct pinmux_map *map;
+
+	seq_puts(s, "Pinmux maps:\n");
+	list_for_each_entry(pmx, &pinmux_list, node) {
+		map = pmx->map;
+
+		seq_printf(s, "map: %s -> %s\n", map->function,
+			   pmx->dev ? dev_name(pmx->dev) : "(unassigned)");
+	}
+
+	return 0;
+}
+
+static int pinmux_pins_show(struct seq_file *s, void *what)
+{
+	unsigned pin;
+
+	seq_puts(s, "Pinmux settings per pin\n");
+	seq_puts(s, "Format: pin (name): pinmuxfunction pinmuxdriver\n");
+	spin_lock(&pin_desc_tree_lock);
+	for (pin = 0; pin < num_pins; pin++) {
+		struct pin_desc *desc;
+		struct pinmux_dev *pmxdev;
+
+		desc = radix_tree_lookup(&pin_desc_tree, pin);
+		pmxdev = desc->pmxdev;
+
+		seq_printf(s, "pin %d (%s): %s", pin,
+			   desc->name ? desc->name : "(unnamed)",
+			   desc->requested ? desc->function : "(unclaimed)");
+
+		if (pmxdev && pmxdev->desc->ops->dbg_show)
+			pmxdev->desc->ops->dbg_show(pmxdev, s,
+						    pin - pmxdev->desc->base);
+
+		seq_puts(s, "\n");
+	}
+	spin_unlock(&pin_desc_tree_lock);
+
+	return 0;
+}
+
+static int pins_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, pins_show, NULL);
+}
+
+static int pinmux_devices_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, pinmux_devices_show, NULL);
+}
+
+static int pinmux_maps_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, pinmux_maps_show, NULL);
+}
+
+static int pinmux_pins_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, pinmux_pins_show, NULL);
+}
+
+static const struct file_operations pins_ops = {
+	.open		= pins_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static const struct file_operations pinmux_devices_ops = {
+	.open		= pinmux_devices_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static const struct file_operations pinmux_maps_ops = {
+	.open		= pinmux_maps_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static const struct file_operations pinmux_pins_ops = {
+	.open		= pinmux_pins_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static struct dentry *debugfs_root;
+
+static void pinctrl_init_debugfs(void)
+{
+	debugfs_root = debugfs_create_dir("pinctrl", NULL);
+	if (IS_ERR(debugfs_root) || !debugfs_root) {
+		pr_warn("failed to create debugfs directory\n");
+		debugfs_root = NULL;
+		return;
+	}
+
+	debugfs_create_file("pins", S_IFREG | S_IRUGO,
+			    debugfs_root, NULL, &pins_ops);
+	debugfs_create_file("pinmux-devices", S_IFREG | S_IRUGO,
+			    debugfs_root, NULL, &pinmux_devices_ops);
+	debugfs_create_file("pinmux-maps", S_IFREG | S_IRUGO,
+			    debugfs_root, NULL, &pinmux_maps_ops);
+	debugfs_create_file("pinmux-pins", S_IFREG | S_IRUGO,
+			    debugfs_root, NULL, &pinmux_pins_ops);
+}
+
+#else /* CONFIG_DEBUG_FS */
+
+static void pinctrl_init_debugfs(void)
+{
+}
+
+#endif
+
+static int __init pinctrl_init(void)
+{
+	int ret;
+
+	ret = class_register(&pinmux_class);
+	pr_info("initialized pinctrl subsystem\n");
+
+	pinctrl_init_debugfs();
+	return ret;
+}
+
+/* init early since many drivers really need to initialized pinmux early */
+core_initcall(pinctrl_init);
diff --git a/include/linux/pinctrl/machine.h b/include/linux/pinctrl/machine.h
new file mode 100644
index 0000000..1bc29f7
--- /dev/null
+++ b/include/linux/pinctrl/machine.h
@@ -0,0 +1,57 @@
+/*
+ * Machine interface for the pinctrl subsystem.
+ *
+ * Copyright (C) 2011 ST-Ericsson SA
+ * Written on behalf of Linaro for ST-Ericsson
+ * Based on bits of regulator core, gpio core and clk core
+ *
+ * Author: Linus Walleij <linus.walleij@linaro.org>
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ */
+#ifndef __LINUX_PINMUX_MACHINE_H
+#define __LINUX_PINMUX_MACHINE_H
+
+/**
+ * struct pinmux_map - boards/machines shall provide this map for devices
+ * @function: a functional name for this mapping so it can be passed down
+ *	to the driver to invoke that function and be referenced by this ID
+ *	in e.g. pinmux_get()
+ * @dev: the device using this specific mapping, may be NULL if you provide
+ *	.dev_name instead (this is more common)
+ * @dev_name: the name of the device using this specific mapping, the name
+ *	must be the same that will return your struct device*
+ */
+struct pinmux_map {
+	const char *function;
+	struct device *dev;
+	const char *dev_name;
+};
+
+/* Convenience macro to set a simple map from a function to a named device */
+#define PINMUX_MAP(a, b) { .function = a, .dev_name = b }
+
+/**
+ * struct pinctrl_pin_desc - boards/machines provide information on their
+ * pins, pads or other muxable units in this struct
+ * @number: unique pin number from the global pin number space
+ * @name: a name for this pin
+ */
+struct pinctrl_pin_desc {
+	unsigned number;
+	const char *name;
+};
+
+/* Convenience macro to define a single named or anonymous pin descriptor */
+#define PINCTRL_PIN(a, b) { .number = a, .name = b }
+#define PINCTRL_PIN_ANON(a) { .number = a }
+
+extern int pinctrl_register_pins_sparse(struct pinctrl_pin_desc const *pins,
+				unsigned num_descs);
+extern int pinctrl_register_pins_dense(struct pinctrl_pin_desc const *pins,
+				unsigned num_descs, unsigned num_pins);
+extern int pinctrl_register_anon_pins(unsigned first, unsigned last);
+extern int pinmux_register_mappings(struct pinmux_map const *map,
+				    unsigned num_maps);
+
+#endif
diff --git a/include/linux/pinctrl/pinmux.h b/include/linux/pinctrl/pinmux.h
new file mode 100644
index 0000000..7b40893
--- /dev/null
+++ b/include/linux/pinctrl/pinmux.h
@@ -0,0 +1,180 @@
+/*
+ * Interface the pinmux subsystem
+ *
+ * Copyright (C) 2011 ST-Ericsson SA
+ * Written on behalf of Linaro for ST-Ericsson
+ * Based on bits of regulator core, gpio core and clk core
+ *
+ * Author: Linus Walleij <linus.walleij@linaro.org>
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ */
+#ifndef __LINUX_PINCTRL_PINMUX_H
+#define __LINUX_PINCTRL_PINMUX_H
+
+#include <linux/list.h>
+#include <linux/seq_file.h>
+
+struct pinmux;
+
+#ifdef CONFIG_PINCTRL
+
+struct pinmux_dev;
+
+/**
+ * struct pinmux_ops - pinmux operations, to be implemented by drivers
+ * @request: called by the core to see if a certain pin can be muxed in
+ *	and made available in a certain mux setting The driver is allowed
+ *	to answer "no" by returning a negative error code
+ * @list_functions: list the number of selectable named functions available
+ *	in this pinmux driver, the core will begin on 0 and call this
+ *	repeatedly as long as it returns >= 0 to enumerate mux settings
+ * @get_function_name: return the function name of the muxing selector,
+ *	called by the core to figure out which mux setting it shall map a
+ *	certain device to
+ * @get_function_pins: return an array of pins corresponding to a certain
+ *	function selector in @pins, and the size of the array in @num_pins
+ * @enable: enable a certain muxing enumerator. The driver does not need to
+ *	figure out whether enabling this function conflicts some other use
+ *	of the pins, such collisions are handled by the pinmux subsystem
+ * @disable: disable a certain muxing enumerator
+ * @config: custom configuration function for a certain muxing enumerator -
+ *	this works a bit like an ioctl() and can pass in and return arbitrary
+ *	configuration data to the pinmux
+ * @gpio_request_enable: requests and enables GPIO on a certain pin.
+ *	Implement this only if you can mux every pin individually as GPIO. If
+ *	your gpio assignments are grouped, so you cannot control the GPIO
+ *	muxing of every indvidual pin.
+ * @dbg_show: optional debugfs display hook that will provide per-device
+ *	info for a certain pin in debugfs
+ */
+struct pinmux_ops {
+	int (*request) (struct pinmux_dev *pmxdev, unsigned offset);
+	int (*free) (struct pinmux_dev *pmxdev, unsigned offset);
+	int (*list_functions) (struct pinmux_dev *pmxdev, unsigned selector);
+	const char *(*get_function_name) (struct pinmux_dev *pmxdev,
+					unsigned selector);
+	int (*get_function_pins) (struct pinmux_dev *pmxdev, unsigned selector,
+			unsigned ** const pins, unsigned * const num_pins);
+	int (*enable) (struct pinmux_dev *pmxdev, unsigned selector);
+	void (*disable) (struct pinmux_dev *pmxdev, unsigned selector);
+	int (*config) (struct pinmux_dev *pmxdev, unsigned selector,
+		       u16 param, unsigned long *data);
+	int (*gpio_request_enable) (struct pinmux_dev *pmxdev, unsigned offset);
+	void (*dbg_show) (struct pinmux_dev *pmxdev, struct seq_file *s,
+			  unsigned offset);
+};
+
+/**
+ * struct pinmux_desc - pinmux descriptor, register this to pinmux subsystem
+ * @name: name for the pinmux
+ * @ops: pinmux operation table
+ * @owner: module providing the pinmux, used for refcounting
+ * @base: the number of the first pin handled by this pinmux, in the global
+ *	pin space, subtracted from a given pin to get the offset into the range
+ *	of a certain pinmux
+ * @npins: the number of pins handled by this pinmux - note that
+ *	this is the number of possible pin settings, if your driver handles
+ *	8 pins that each can be muxed in 3 different ways, you reserve 24
+ *	pins in the global pin space and set this to 24
+ */
+struct pinmux_desc {
+	const char *name;
+	struct pinmux_ops *ops;
+	struct module *owner;
+	int base;
+	int npins;
+};
+
+/**
+ * struct pinmux_dev - pinmux class device
+ * @desc: the descriptor supplied when initializing this pinmux
+ * @node: node to include this pinmux in the global pinmux list
+ * @dev: the device entry for this pinmux
+ * @owner: module providing the pinmux, used for refcounting
+ * @driver_data: driver data for drivers registering to the subsystem
+ *
+ * This should be dereferenced and used by the pinmux core ONLY
+ */
+struct pinmux_dev {
+	struct pinmux_desc *desc;
+	struct list_head node;
+	struct device dev;
+	struct module *owner;
+	void *driver_data;
+};
+
+/* These should only be used from drives */
+static inline const char *pmxdev_get_name(struct pinmux_dev *pmxdev)
+{
+	/* We're not allowed to register devices without name */
+	return pmxdev->desc->name;
+}
+
+static inline void *pmxdev_get_drvdata(struct pinmux_dev *pmxdev)
+{
+	return pmxdev->driver_data;
+}
+
+/* External interface to pinmux */
+extern int pin_is_valid(int pin);
+extern int pinmux_request_gpio(int pin, unsigned gpio);
+extern void pinmux_free_gpio(int pin);
+extern struct pinmux *pinmux_get(struct device *dev, const char *func);
+extern void pinmux_put(struct pinmux *pmx);
+extern int pinmux_enable(struct pinmux *pmx);
+extern void pinmux_disable(struct pinmux *pmx);
+extern int pinmux_config(struct pinmux *pmx, u16 param, unsigned long *data);
+extern struct pinmux_dev *pinmux_register(struct pinmux_desc *pmxdesc,
+				struct device *dev, void *driver_data);
+extern void pinmux_unregister(struct pinmux_dev *pmxdev);
+
+#else /* !CONFIG_PINMUX */
+
+static inline int pin_is_valid(int pin)
+{
+	return pin >= 0;
+}
+
+static inline int pinmux_request_gpio(int pin, unsigned gpio)
+{
+	return 0;
+}
+
+static inline void pinmux_free_gpio(int pin)
+{
+}
+
+static inline int pinmux_register_mappings(struct pinmux_map const *map,
+					   unsigned num_maps)
+{
+	return 0;
+}
+
+static inline struct pinmux *pinmux_get(struct device *dev, const char *func)
+{
+	return NULL;
+}
+
+static inline void pinmux_put(struct pinmux *pmx)
+{
+}
+
+static inline int pinmux_enable(struct pinmux *pmx)
+{
+	return 0;
+}
+
+static inline void pinmux_disable(struct pinmux *pmx)
+{
+}
+
+static inline int pinmux_config(struct pinmux *pmx, u16 param,
+				unsigned long *data)
+{
+	return 0;
+}
+
+#endif /* CONFIG_PINMUX */
+
+#endif /* __LINUX_PINCTRL_PINMUX_H */
