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drivers: create a pin control subsystem 

This creates a subsystem for handling of pin control devices.
These are devices that control different aspects of package
pins.

Currently it handles pinmuxing, i.e. assigning electronic
functions to groups of pins on primarily PGA and BGA type of
chip packages which are common in embedded systems.

The plan is to also handle other I/O pin control aspects
such as biasing, driving, input properties such as
schmitt-triggering, load capacitance etc within this
subsystem, to remove a lot of ARM arch code as well as
feature-creepy GPIO drivers which are implementing the same
thing over and over again.

This is being done to depopulate the arch/arm/* directory
of such custom drivers and try to abstract the infrastructure
they all need. See the Documentation/pinctrl.txt file that is
part of this patch for more details.

ChangeLog v1->v2:

- Various minor fixes from Joe's and Stephens review comments
- Added a pinmux_config() that can invoke custom configuration
  with arbitrary data passed in or out to/from the pinmux driver

ChangeLog v2->v3:

- Renamed subsystem folder to "pinctrl" since we will likely
  want to keep other pin control such as biasing in this
  subsystem too, so let us keep to something generic even though
  we're mainly doing pinmux now.
- As a consequence, register pins as an abstract entity separate
  from the pinmux. The muxing functions will claim pins out of the
  pin pool and make sure they do not collide. Pins can now be
  named by the pinctrl core.
- Converted the pin lookup from a static array into a radix tree,
  I agreed with Grant Likely to try to avoid any static allocation
  (which is crap for device tree stuff) so I just rewrote this
  to be dynamic, just like irq number descriptors. The
  platform-wide definition of number of pins goes away - this is
  now just the sum total of the pins registered to the subsystem.
- Make sure mappings with only a function name and no device
  works properly.

ChangeLog v3->v4:

- Define a number space per controller instead of globally,
  Stephen and Grant requested the same thing so now maps need to
  define target controller, and the radix tree of pin descriptors
  is a property on each pin controller device.
- Add a compulsory pinctrl device entry to the pinctrl mapping
  table. This must match the pinctrl device, like "pinctrl.0"
- Split the file core.c in two: core.c and pinmux.c where the
  latter carry all pinmux stuff, the core is for generic pin
  control, and use local headers to access functionality between
  files. It is now possible to implement a "blank" pin controller
  without pinmux capabilities. This split will make new additions
  like pindrive.c, pinbias.c etc possible for combined drivers
  and chunks of functionality which is a GoodThing(TM).
- Rewrite the interaction with the GPIO subsystem - the pin
  controller descriptor now handles this by defining an offset
  into the GPIO numberspace for its handled pin range. This is
  used to look up the apropriate pin controller for a GPIO pin.
  Then that specific GPIO range is matched 1-1 for the target
  controller instance.
- Fixed a number of review comments from Joe Perches.
- Broke out a header file pinctrl.h for the core pin handling
  stuff that will be reused by other stuff than pinmux.
- Fixed some erroneous EXPORT() stuff.
- Remove mispatched U300 Kconfig and Makefile entries
- Fixed a number of review comments from Stephen Warren, not all
  of them - still WIP. But I think the new mapping that will
  specify which function goes to which pin mux controller address
  50% of your concerns (else beat me up).

ChangeLog v4->v5:

- Defined a "position" for each function, so the pin controller now
  tracks a function in a certain position, and the pinmux maps define
  what position you want the function in. (Feedback from Stephen
  Warren and Sascha Hauer).
- Since we now need to request a combined function+position from
  the machine mapping table that connect mux settings to drivers,
  it was extended with a position field and a name field. The
  name field is now used if you e.g. need to switch between two
  mux map settings at runtime.
- Switched from a class device to using struct bus_type for this
  subsystem. Verified sysfs functionality: seems to work fine.
  (Feedback from Arnd Bergmann and Greg Kroah-Hartman)
- Define a per pincontroller list of GPIO ranges from the GPIO
  pin space that can be handled by the pin controller. These can
  be added one by one at runtime. (Feedback from Barry Song)
- Expanded documentation of regulator_[get|enable|disable|put]
  semantics.
- Fixed a number of review comments from Barry Song. (Thanks!)

ChangeLog v5->v6:

- Create an abstract pin group concept that can sort pins into
  named and enumerated groups no matter what the use of these
  groups may be, one possible usecase is a group of pins being
  muxed in or so. The intention is however to also use these
  groups for other pin control activities.
- Make it compulsory for pinmux functions to associate with
  at least one group, so the abstract pin group concept is used
  to define the groups of pins affected by a pinmux function.
  The pinmux driver interface has been altered so as to enforce
  a function to list applicable groups per function.
- Provide an optional .group entry in the pinmux machine map
  so the map can select beteween different available groups
  to be used with a certain function.
- Consequent changes all over the place so that e.g. debugfs
  present reasonable information about the world.
- Drop the per-pin mux (*config) function in the pinmux_ops
  struct - I was afraid that this would start to be used for
  things totally unrelated to muxing, we can introduce that to
  the generic struct pinctrl_ops if needed. I want to keep
  muxing orthogonal to other pin control subjects and not mix
  these things up.

ChangeLog v6->v7:

- Make it possible to have several map entries matching the
  same device, pin controller and function, but using
  a different group, and alter the semantics so that
  pinmux_get() will pick all matching map entries, and
  store the associated groups in a list. The list will
  then be iterated over at pinmux_enable()/pinmux_disable()
  and corresponding driver functions called for each
  defined group. Notice that you're only allowed to map
  multiple *groups* to the same
  { device, pin controller, function } triplet, attempts
  to map the same device to multiple pin controllers will
  for example fail. This is hopefully the crucial feature
  requested by Stephen Warren.
- Add a pinmux hogging field to the pinmux mapping entries,
  and enable the pinmux core to hog pinmux map entries.
  This currently only works for pinmuxes without assigned
  devices as it looks now, but with device trees we can
  look up the corresponding struct device * entries when
  we register the pinmux driver, and have it hog each
  pinmux map in turn, for a simple approach to
  non-dynamic pin muxing. This addresses an issue from
  Grant Likely that the machine should take care of as
  much of the pinmux setup as possible, not the devices.
  By supplying a list of hogs, it can now instruct the
  core to take care of any static mappings.
- Switch pinmux group retrieveal function to grab an
  array of strings representing the groups rather than an
  array of unsigned and rewrite accordingly.
- Alter debugfs to show the grouplist handled by each
  pinmux. Also add a list of hogs.
- Dynamically allocate a struct pinmux at pinmux_get() and
  free it at pinmux_put(), then add these to the global
  list of pinmuxes active as we go along.
- Go over the list of pinmux maps at pinmux_get() time
  and repeatedly apply matches.
- Retrieve applicable groups per function from the driver
  as a string array rather than a unsigned array, then
  lookup the enumerators.
- Make the device to pinmux map a singleton - only allow the
  mapping table to be registered once and even tag the
  registration function with __init so it surely won't be
  abused.
- Create a separate debugfs file to view the pinmux map at
  runtime.
- Introduce a spin lock to the pin descriptor struct, lock it
  when modifying pin status entries. Reported by Stijn Devriendt.
- Fix up the documentation after review from Stephen Warren.
- Let the GPIO ranges give names as const char * instead of some
  fixed-length string.
- add a function to unregister GPIO ranges to mirror the
  registration function.
- Privatized the struct pinctrl_device and removed it from the
  <linux/pinctrl/pinctrl.h> API, the drivers do not need to know
  the members of this struct. It is now in the local header
  "core.h".
- Rename the concept of "anonymous" mux maps to "system" muxes
  and add convenience macros and documentation.

ChangeLog v7->v8:

- Delete the leftover pinmux_config() function from the
 <linux/pinctrl/pinmux.h> header.
- Fix a race condition found by Stijn Devriendt in pin_request()

ChangeLog v8->v9:

- Drop the bus_type and the sysfs attributes and all, we're not on
  the clear about how this should be used for e.g. userspace
  interfaces so let us save this for the future.
- Use the right name in MAINTAINERS, PIN CONTROL rather than
  PINMUX
- Don't kfree() the device state holder, let the .remove() callback
  handle this.
- Fix up numerous kerneldoc headers to have one line for the function
  description and more verbose documentation below the parameters

ChangeLog v9->v10:
- pinctrl: EXPORT_SYMBOL needs export.h, folded in a patch
  from Steven Rothwell
- fix pinctrl_register error handling, folded in a patch from
  Axel Lin
- Various fixes to documentation text so that it's consistent.
- Removed pointless comment from drivers/Kconfig
- Removed dependency on SYSFS since we removed the bus in
  v9.
- Renamed hopelessly abbreviated pctldev_* functions to the
  more verbose pinctrl_dev_*
- Drop mutex properly when looking up GPIO ranges
- Return NULL instead of ERR_PTR() errors on registration of
  pin controllers, using cast pointers is fragile. We can
  live without the detailed error codes for sure.

Cc: Stijn Devriendt <highguy@gmail.com>
Cc: Joe Perches <joe@perches.com>
Cc: Russell King <linux@arm.linux.org.uk>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Barry Song <21cnbao@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
hifive-unleashed-5.1
Linus Walleij 2011-05-02 20:50:54 +02:00 committed by Linus Walleij
parent a102a9ece5
commit 2744e8afb3
13 changed files with 3249 additions and 0 deletions
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950
Documentation/pinctrl.txt 100644
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PINCTRL (PIN CONTROL) subsystem
This document outlines the pin control subsystem in Linux
This subsystem deals with:
- Enumerating and naming controllable pins
- 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 CONTROLLER:
- A pin controller is a piece of hardware, usually a set of registers, that
can control PINs. It may be able to multiplex, bias, set load capacitance,
set drive strength etc for individual pins or groups of pins.
Definition of PIN:
- PINS are equal to pads, fingers, balls or whatever packaging input or
output line you want to control and these are denoted by unsigned integers
in the range 0..maxpin. This numberspace is local to each PIN CONTROLLER, so
there may be several such number spaces in a system. This pin space may
be sparse - i.e. there may be gaps in the space with numbers where no
pin exists.
When a PIN CONTROLLER is instatiated, it will register a descriptor to the
pin control framework, and this descriptor contains an array of pin descriptors
describing the pins handled by this specific pin controller.
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 a pin controller and name all the pins on this package we can do
this in our driver:
#include <linux/pinctrl/pinctrl.h>
const struct pinctrl_pin_desc __refdata foo_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"),
};
static struct pinctrl_desc foo_desc = {
.name = "foo",
.pins = foo_pins,
.npins = ARRAY_SIZE(foo_pins),
.maxpin = 63,
.owner = THIS_MODULE,
};
int __init foo_probe(void)
{
struct pinctrl_dev *pctl;
pctl = pinctrl_register(&foo_desc, <PARENT>, NULL);
if (IS_ERR(pctl))
pr_err("could not register foo pin driver\n");
}
Pins usually have fancier names than this. You can find these in the dataheet
for your chip. Notice that the core pinctrl.h file provides a fancy macro
called PINCTRL_PIN() to create the struct entries. As you can see I enumerated
the pins from 0 in the upper left corner to 63 in the lower right corner,
this enumeration was arbitrarily chosen, in practice you need to think
through your numbering system so that it matches the layout of registers
and such things in your driver, or the code may become complicated. You must
also consider matching of offsets to the GPIO ranges that may be handled by
the pin controller.
For a padring with 467 pads, as opposed to actual pins, I used an enumeration
like this, walking around the edge of the chip, which seems to be industry
standard too (all these pads had names, too):
0 ..... 104
466 105
. .
. .
358 224
357 .... 225
Pin groups
==========
Many controllers need to deal with groups of pins, so the pin controller
subsystem has a mechanism for enumerating groups of pins and retrieving the
actual enumerated pins that are part of a certain group.
For example, say that we have a group of pins dealing with an SPI interface
on { 0, 8, 16, 24 }, and a group of pins dealing with an I2C interface on pins
on { 24, 25 }.
These two groups are presented to the pin control subsystem by implementing
some generic pinctrl_ops like this:
#include <linux/pinctrl/pinctrl.h>
struct foo_group {
const char *name;
const unsigned int *pins;
const unsigned num_pins;
};
static unsigned int spi0_pins[] = { 0, 8, 16, 24 };
static unsigned int i2c0_pins[] = { 24, 25 };
static const struct foo_group foo_groups[] = {
{
.name = "spi0_grp",
.pins = spi0_pins,
.num_pins = ARRAY_SIZE(spi0_pins),
},
{
.name = "i2c0_grp",
.pins = i2c0_pins,
.num_pins = ARRAY_SIZE(i2c0_pins),
},
};
static int foo_list_groups(struct pinctrl_dev *pctldev, unsigned selector)
{
if (selector >= ARRAY_SIZE(foo_groups))
return -EINVAL;
return 0;
}
static const char *foo_get_group_name(struct pinctrl_dev *pctldev,
unsigned selector)
{
return foo_groups[selector].name;
}
static int foo_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector,
unsigned ** const pins,
unsigned * const num_pins)
{
*pins = (unsigned *) foo_groups[selector].pins;
*num_pins = foo_groups[selector].num_pins;
return 0;
}
static struct pinctrl_ops foo_pctrl_ops = {
.list_groups = foo_list_groups,
.get_group_name = foo_get_group_name,
.get_group_pins = foo_get_group_pins,
};
static struct pinctrl_desc foo_desc = {
...
.pctlops = &foo_pctrl_ops,
};
The pin control subsystem will call the .list_groups() function repeatedly
beginning on 0 until it returns non-zero to determine legal selectors, then
it will call the other functions to retrieve the name and pins of the group.
Maintaining the data structure of the groups is up to the driver, this is
just a simple example - in practice you may need more entries in your group
structure, for example specific register ranges associated with each group
and so on.
Interaction with the GPIO subsystem
===================================
The GPIO drivers may want to perform operations of various types on the same
physical pins that are also registered as pin controller pins.
Since the pin controller subsystem have its pinspace local to the pin
controller we need a mapping so that the pin control subsystem can figure out
which pin controller handles control of a certain GPIO pin. Since a single
pin controller may be muxing several GPIO ranges (typically SoCs that have
one set of pins but internally several GPIO silicon blocks, each modeled as
a struct gpio_chip) any number of GPIO ranges can be added to a pin controller
instance like this:
struct gpio_chip chip_a;
struct gpio_chip chip_b;
static struct pinctrl_gpio_range gpio_range_a = {
.name = "chip a",
.id = 0,
.base = 32,
.npins = 16,
.gc = &chip_a;
};
static struct pinctrl_gpio_range gpio_range_a = {
.name = "chip b",
.id = 0,
.base = 48,
.npins = 8,
.gc = &chip_b;
};
{
struct pinctrl_dev *pctl;
...
pinctrl_add_gpio_range(pctl, &gpio_range_a);
pinctrl_add_gpio_range(pctl, &gpio_range_b);
}
So this complex system has one pin controller handling two different
GPIO chips. Chip a has 16 pins and chip b has 8 pins. They are mapped in
the global GPIO pin space at:
chip a: [32 .. 47]
chip b: [48 .. 55]
When GPIO-specific functions in the pin control subsystem are called, these
ranges will be used to look up the apropriate pin controller by inspecting
and matching the pin to the pin ranges across all controllers. When a
pin controller handling the matching range is found, GPIO-specific functions
will be called on that specific pin controller.
For all functionalities dealing with pin biasing, pin muxing etc, the pin
controller subsystem will subtract the range's .base offset from the passed
in gpio pin number, and pass that on to the pin control driver, so the driver
will get an offset into its handled number range. Further it is also passed
the range ID value, so that the pin controller knows which range it should
deal with.
For example: if a user issues pinctrl_gpio_set_foo(50), the pin control
subsystem will find that the second range on this pin controller matches,
subtract the base 48 and call the
pinctrl_driver_gpio_set_foo(pinctrl, range, 2) where the latter function has
this signature:
int pinctrl_driver_gpio_set_foo(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *rangeid,
unsigned offset);
Now the driver knows that we want to do some GPIO-specific operation on the
second GPIO range handled by "chip b", at offset 2 in that specific range.
(If the GPIO subsystem is ever refactored to use a local per-GPIO controller
pin space, this mapping will need to be augmented accordingly.)
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 pin (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 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() 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 }.
On the botton row at { A1, B1, C1, D1, E1, F1, G1, H1 } we have something
special - it's an external MMC bus that can be 2, 4 or 8 bits wide, and it will
consume 2, 4 or 8 pins respectively, so either { A1, B1 } are taken or
{ A1, B1, C1, D1 } or all of them. If we use all 8 bits, we cannot use the SPI
port on pins { G4, G3, G2, G1 } of course.
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 functionality in the pin controller 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 pin
control subsystem in the drivers/pinctrl/* directory of the kernel. The
pin control driver knows the possible functions. In the example above you can
identify three pinmux functions, one for spi, one for i2c and one for mmc.
- FUNCTIONS are assumed to be enumerable from zero in a one-dimensional array.
In this case the array could be something like: { spi0, i2c0, mmc0 }
for the three available functions.
- FUNCTIONS have PIN GROUPS as defined on the generic level - so a certain
function is *always* associated with a certain set of pin groups, could
be just a single one, but could also be many. In the example above the
function i2c is associated with the pins { A5, B5 }, enumerated as
{ 24, 25 } in the controller pin space.
The Function spi is associated with pin groups { A8, A7, A6, A5 }
and { G4, G3, G2, G1 }, which are enumerated as { 0, 8, 16, 24 } and
{ 38, 46, 54, 62 } respectively.
Group names must be unique per pin controller, no two groups on the same
controller may have the same name.
- The combination of a FUNCTION and a PIN GROUP determine a certain function
for a certain set of pins. The knowledge of the functions and pin groups
and their machine-specific particulars are kept inside the pinmux driver,
from the outside only the enumerators are known, and the driver core can:
- Request the name of a function with a certain selector (>= 0)
- A list of groups associated with a certain function
- Request that a certain group in that list to be activated for a certain
function
As already described above, pin groups are in turn self-descriptive, so
the core will retrieve the actual pin range in a certain group from the
driver.
- FUNCTIONS and GROUPS on a certain PIN CONTROLLER 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. Defining a pin controller, function and group thus uniquely identify
the set of pins to be used by a certain device. (If only one possible group
of pins is available for the function, no group name need to be supplied -
the core will simply select the first and only group available.)
In the example case we can define that this particular machine shall
use device spi0 with pinmux function fspi0 group gspi0 and i2c0 on function
fi2c0 group gi2c0, on the primary pin controller, we get mappings
like these:
{
{"map-spi0", spi0, pinctrl0, fspi0, gspi0},
{"map-i2c0", i2c0, pinctrl0, fi2c0, gi2c0}
}
Every map must be assigned a symbolic name, pin controller and function.
The group is not compulsory - if it is omitted the first group presented by
the driver as applicable for the function will be selected, which is
useful for simple cases.
The device name is present in map entries tied to specific devices. Maps
without device names are referred to as SYSTEM pinmuxes, such as can be taken
by the machine implementation on boot and not tied to any specific device.
It is possible to map several groups to the same combination of device,
pin controller and function. This is for cases where a certain function on
a certain pin controller may use different sets of pins in different
configurations.
- PINS for a certain FUNCTION using a certain PIN GROUP on a certain
PIN CONTROLLER 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.
Assumptions:
We assume that the number possible function maps to pin groups is limited by
the hardware. I.e. we assume that there is no system where any function can be
mapped to any pin, like in a phone exchange. So the available pins groups for
a certain function will be limited to a few choices (say up to eight or so),
not hundreds or any amount of choices. This is the characteristic we have found
by inspecting available pinmux hardware, and a necessary assumption since we
expect pinmux drivers to present *all* possible function vs pin group mappings
to the subsystem.
Pinmux drivers
==============
The pinmux core takes care of preventing conflicts on pins and calling
the pin controller driver to execute different settings.
It is the responsibility of the pinmux driver to impose further restrictions
(say for example infer electronic limitations due to load etc) to determine
whether or not the requested function can actually be allowed, and in case it
is possible to perform the requested mux setting, poke the hardware so that
this happens.
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, 2, 3 or 4
into some register named MUX to select a certain function with a certain
group of pins would work something like this:
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinmux.h>
struct foo_group {
const char *name;
const unsigned int *pins;
const unsigned num_pins;
};
static const unsigned spi0_0_pins[] = { 0, 8, 16, 24 };
static const unsigned spi0_1_pins[] = { 38, 46, 54, 62 };
static const unsigned i2c0_pins[] = { 24, 25 };
static const unsigned mmc0_1_pins[] = { 56, 57 };
static const unsigned mmc0_2_pins[] = { 58, 59 };
static const unsigned mmc0_3_pins[] = { 60, 61, 62, 63 };
static const struct foo_group foo_groups[] = {
{
.name = "spi0_0_grp",
.pins = spi0_0_pins,
.num_pins = ARRAY_SIZE(spi0_0_pins),
},
{
.name = "spi0_1_grp",
.pins = spi0_1_pins,
.num_pins = ARRAY_SIZE(spi0_1_pins),
},
{
.name = "i2c0_grp",
.pins = i2c0_pins,
.num_pins = ARRAY_SIZE(i2c0_pins),
},
{
.name = "mmc0_1_grp",
.pins = mmc0_1_pins,
.num_pins = ARRAY_SIZE(mmc0_1_pins),
},
{
.name = "mmc0_2_grp",
.pins = mmc0_2_pins,
.num_pins = ARRAY_SIZE(mmc0_2_pins),
},
{
.name = "mmc0_3_grp",
.pins = mmc0_3_pins,
.num_pins = ARRAY_SIZE(mmc0_3_pins),
},
};
static int foo_list_groups(struct pinctrl_dev *pctldev, unsigned selector)
{
if (selector >= ARRAY_SIZE(foo_groups))
return -EINVAL;
return 0;
}
static const char *foo_get_group_name(struct pinctrl_dev *pctldev,
unsigned selector)
{
return foo_groups[selector].name;
}
static int foo_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector,
unsigned ** const pins,
unsigned * const num_pins)
{
*pins = (unsigned *) foo_groups[selector].pins;
*num_pins = foo_groups[selector].num_pins;
return 0;
}
static struct pinctrl_ops foo_pctrl_ops = {
.list_groups = foo_list_groups,
.get_group_name = foo_get_group_name,
.get_group_pins = foo_get_group_pins,
};
struct foo_pmx_func {
const char *name;
const char * const *groups;
const unsigned num_groups;
};
static const char * const spi0_groups[] = { "spi0_1_grp" };
static const char * const i2c0_groups[] = { "i2c0_grp" };
static const char * const mmc0_groups[] = { "mmc0_1_grp", "mmc0_2_grp",
"mmc0_3_grp" };
static const struct foo_pmx_func foo_functions[] = {
{
.name = "spi0",
.groups = spi0_groups,
.num_groups = ARRAY_SIZE(spi0_groups),
},
{
.name = "i2c0",
.groups = i2c0_groups,
.num_groups = ARRAY_SIZE(i2c0_groups),
},
{
.name = "mmc0",
.groups = mmc0_groups,
.num_groups = ARRAY_SIZE(mmc0_groups),
},
};
int foo_list_funcs(struct pinctrl_dev *pctldev, unsigned selector)
{
if (selector >= ARRAY_SIZE(foo_functions))
return -EINVAL;
return 0;
}
const char *foo_get_fname(struct pinctrl_dev *pctldev, unsigned selector)
{
return myfuncs[selector].name;
}
static int foo_get_groups(struct pinctrl_dev *pctldev, unsigned selector,
const char * const **groups,
unsigned * const num_groups)
{
*groups = foo_functions[selector].groups;
*num_groups = foo_functions[selector].num_groups;
return 0;
}
int foo_enable(struct pinctrl_dev *pctldev, unsigned selector,
unsigned group)
{
u8 regbit = (1 << group);
writeb((readb(MUX)|regbit), MUX)
return 0;
}
int foo_disable(struct pinctrl_dev *pctldev, unsigned selector,
unsigned group)
{
u8 regbit = (1 << group);
writeb((readb(MUX) & ~(regbit)), MUX)
return 0;
}
struct pinmux_ops foo_pmxops = {
.list_functions = foo_list_funcs,
.get_function_name = foo_get_fname,
.get_function_groups = foo_get_groups,
.enable = foo_enable,
.disable = foo_disable,
};
/* Pinmux operations are handled by some pin controller */
static struct pinctrl_desc foo_desc = {
...
.pctlops = &foo_pctrl_ops,
.pmxops = &foo_pmxops,
};
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. Thus bits 0 and 1 in the control register will never be set at the
same time.
All the above functions are mandatory to implement for a pinmux driver.
Pinmux interaction with the GPIO subsystem
==========================================
The function list could become long, especially if you can convert every
individual pin into a GPIO pin independent of any other pins, and then try
the approach to define every pin as a function.
In this case, the function array would become 64 entries for each GPIO
setting and then the device functions.
For this reason there is an additional function a pinmux driver can implement
to enable only GPIO on an individual pin: .gpio_request_enable(). The same
.free() function as for other functions is assumed to be usable also for
GPIO pins.
This function will pass in the affected GPIO range identified by the pin
controller core, so you know which GPIO pins are being affected by the request
operation.
Alternatively it is fully allowed to use named functions for each GPIO
pin, the pinmux_request_gpio() will attempt to obtain the function "gpioN"
where "N" is the global GPIO pin number if no special GPIO-handler is
registered.
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[] = {
{
.ctrl_dev_name = "pinctrl.0",
.function = "spi0",
.dev_name = "foo-spi.0",
},
{
.ctrl_dev_name = "pinctrl.0",
.function = "i2c0",
.dev_name = "foo-i2c.0",
},
{
.ctrl_dev_name = "pinctrl.0",
.function = "mmc0",
.dev_name = "foo-mmc.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.
As you can see we may have several pin controllers on the system and thus
we need to specify which one of them that contain the functions we wish
to map. The map can also use struct device * directly, so there is no
inherent need to use strings to specify .dev_name or .ctrl_dev_name, these
are for the situation where you do not have a handle to the struct device *,
for example if they are not yet instantiated or cumbersome to obtain.
You register this pinmux mapping to the pinmux subsystem by simply:
ret = pinmux_register_mappings(&pmx_mapping, ARRAY_SIZE(pmx_mapping));
Since the above construct is pretty common there is a helper macro to make
it even more compact which assumes you want to use pinctrl.0 and position
0 for mapping, for example:
static struct pinmux_map pmx_mapping[] = {
PINMUX_MAP_PRIMARY("I2CMAP", "i2c0", "foo-i2c.0"),
};
Complex mappings
================
As it is possible to map a function to different groups of pins an optional
.group can be specified like this:
...
{
.name = "spi0-pos-A",
.ctrl_dev_name = "pinctrl.0",
.function = "spi0",
.group = "spi0_0_grp",
.dev_name = "foo-spi.0",
},
{
.name = "spi0-pos-B",
.ctrl_dev_name = "pinctrl.0",
.function = "spi0",
.group = "spi0_1_grp",
.dev_name = "foo-spi.0",
},
...
This example mapping is used to switch between two positions for spi0 at
runtime, as described further below under the heading "Runtime pinmuxing".
Further it is possible to match several groups of pins to the same function
for a single device, say for example in the mmc0 example above, where you can
additively expand the mmc0 bus from 2 to 4 to 8 pins. If we want to use all
three groups for a total of 2+2+4 = 8 pins (for an 8-bit MMC bus as is the
case), we define a mapping like this:
...
{
.name "2bit"
.ctrl_dev_name = "pinctrl.0",
.function = "mmc0",
.group = "mmc0_0_grp",
.dev_name = "foo-mmc.0",
},
{
.name "4bit"
.ctrl_dev_name = "pinctrl.0",
.function = "mmc0",
.group = "mmc0_0_grp",
.dev_name = "foo-mmc.0",
},
{
.name "4bit"
.ctrl_dev_name = "pinctrl.0",
.function = "mmc0",
.group = "mmc0_1_grp",
.dev_name = "foo-mmc.0",
},
{
.name "8bit"
.ctrl_dev_name = "pinctrl.0",
.function = "mmc0",
.group = "mmc0_0_grp",
.dev_name = "foo-mmc.0",
},
{
.name "8bit"
.ctrl_dev_name = "pinctrl.0",
.function = "mmc0",
.group = "mmc0_1_grp",
.dev_name = "foo-mmc.0",
},
{
.name "8bit"
.ctrl_dev_name = "pinctrl.0",
.function = "mmc0",
.group = "mmc0_2_grp",
.dev_name = "foo-mmc.0",
},
...
The result of grabbing this mapping from the device with something like
this (see next paragraph):
pmx = pinmux_get(&device, "8bit");
Will be that you activate all the three bottom records in the mapping at
once. Since they share the same name, pin controller device, funcion and
device, and since we allow multiple groups to match to a single device, they
all get selected, and they all get enabled and disable simultaneously by the
pinmux core.
Pinmux requests from drivers
============================
Generally it is discouraged to let individual drivers get and enable pinmuxes.
So if possible, handle the pinmuxes in platform code or some other place where
you have access to all the affected struct device * pointers. In some cases
where a driver needs to switch between different mux mappings at runtime
this is not possible.
A driver may request a certain mux to be activated, usually just the default
mux like this:
#include <linux/pinctrl/pinmux.h>
struct foo_state {
struct pinmux *pmx;
...
};
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 to grab a specific mux mapping and not just the first one found for
this device you can specify a specific mapping name, for example in the above
example the second i2c0 setting: pinmux_get(&device, "spi0-pos-B");
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 semantics of the get/enable respective disable/put is as follows:
- pinmux_get() is called in process context to reserve the pins affected with
a certain mapping and set up the pinmux core and the driver. It will allocate
a struct from the kernel memory to hold the pinmux state.
- pinmux_enable()/pinmux_disable() is quick and can be called from fastpath
(irq context) when you quickly want to set up/tear down the hardware muxing
when running a device driver. Usually it will just poke some values into a
register.
- pinmux_disable() is called in process context to tear down the pin requests
and release the state holder struct for the mux setting.
Usually the pinmux core handled the get/put pair and call out to the device
drivers bookkeeping operations, like checking available functions and the
associated pins, whereas the enable/disable pass on to the pin controller
driver which takes care of activating and/or deactivating the mux setting by
quickly poking some registers.
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.
System pinmux hogging
=====================
A system pinmux map entry, i.e. a pinmux setting that does not have a device
associated with it, can be hogged by the core when the pin controller is
registered. This means that the core will attempt to call pinmux_get() and
pinmux_enable() on it immediately after the pin control device has been
registered.
This is enabled by simply setting the .hog_on_boot field in the map to true,
like this:
{
.name "POWERMAP"
.ctrl_dev_name = "pinctrl.0",
.function = "power_func",
.hog_on_boot = true,
},
Since it may be common to request the core to hog a few always-applicable
mux settings on the primary pin controller, there is a convenience macro for
this:
PINMUX_MAP_PRIMARY_SYS_HOG("POWERMAP", "power_func")
This gives the exact same result as the above construction.
Runtime pinmuxing
=================
It is possible to mux a certain function in and out at runtime, say to move
an SPI port from one set of pins to another set of pins. Say for example for
spi0 in the example above, we expose two different groups of pins for the same
function, but with different named in the mapping as described under
"Advanced mapping" above. So we have two mappings named "spi0-pos-A" and
"spi0-pos-B".
This snippet first muxes the function in the pins defined by group A, enables
it, disables and releases it, and muxes it in on the pins defined by group B:
foo_switch()
{
struct pinmux pmx;
/* Enable on position A */
pmx = pinmux_get(&device, "spi0-pos-A");
if IS_ERR(pmx)
return PTR_ERR(pmx);
pinmux_enable(pmx);
/* This releases the pins again */
pinmux_disable(pmx);
pinmux_put(pmx);
/* Enable on position B */
pmx = pinmux_get(&device, "spi0-pos-B");
if IS_ERR(pmx)
return PTR_ERR(pmx);
pinmux_enable(pmx);
...
}
The above has to be done from process context.

5
MAINTAINERS
View File

@ -5010,6 +5010,11 @@ L: linux-mtd@lists.infradead.org
S: Maintained
F: drivers/mtd/devices/phram.c
PIN CONTROL SUBSYSTEM
M: Linus Walleij <linus.walleij@linaro.org>
S: Maintained
F: drivers/pinmux/
PKTCDVD DRIVER
M: Peter Osterlund <petero2@telia.com>
S: Maintained

2
drivers/Kconfig
View File

@ -56,6 +56,8 @@ source "drivers/pps/Kconfig"
source "drivers/ptp/Kconfig"
source "drivers/pinctrl/Kconfig"
source "drivers/gpio/Kconfig"
source "drivers/w1/Kconfig"

2
drivers/Makefile
View File

@ -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/

29
drivers/pinctrl/Kconfig 100644
View File

@ -0,0 +1,29 @@
#
# PINCTRL infrastructure and drivers
#
menuconfig PINCTRL
bool "PINCTRL Support"
depends on 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 PINMUX
bool "Support pinmux controllers"
help
Say Y here if you want the pincontrol subsystem to handle pin
multiplexing drivers.
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.
endif

6
drivers/pinctrl/Makefile 100644
View File

@ -0,0 +1,6 @@
# generic pinmux support
ccflags-$(CONFIG_DEBUG_PINMUX) += -DDEBUG
obj-$(CONFIG_PINCTRL) += core.o
obj-$(CONFIG_PINMUX) += pinmux.o

599
drivers/pinctrl/core.c 100644
View File

@ -0,0 +1,599 @@
/*
* Core driver for the pin control 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/pinctrl.h>
#include <linux/pinctrl/machine.h>
#include "core.h"
#include "pinmux.h"
/* Global list of pin control devices */
static DEFINE_MUTEX(pinctrldev_list_mutex);
static LIST_HEAD(pinctrldev_list);
static void pinctrl_dev_release(struct device *dev)
{
struct pinctrl_dev *pctldev = dev_get_drvdata(dev);
kfree(pctldev);
}
const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev)
{
/* We're not allowed to register devices without name */
return pctldev->desc->name;
}
EXPORT_SYMBOL_GPL(pinctrl_dev_get_name);
void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev)
{
return pctldev->driver_data;
}
EXPORT_SYMBOL_GPL(pinctrl_dev_get_drvdata);
/**
* get_pinctrl_dev_from_dev() - look up pin controller device
* @dev: a device pointer, this may be NULL but then devname needs to be
* defined instead
* @devname: the name of a device instance, as returned by dev_name(), this
* may be NULL but then dev needs to be defined instead
*
* Looks up a pin control device matching a certain device name or pure device
* pointer, the pure device pointer will take precedence.
*/
struct pinctrl_dev *get_pinctrl_dev_from_dev(struct device *dev,
const char *devname)
{
struct pinctrl_dev *pctldev = NULL;
bool found = false;
mutex_lock(&pinctrldev_list_mutex);
list_for_each_entry(pctldev, &pinctrldev_list, node) {
if (dev && &pctldev->dev == dev) {
/* Matched on device pointer */
found = true;
break;
}
if (devname &&
!strcmp(dev_name(&pctldev->dev), devname)) {
/* Matched on device name */
found = true;
break;
}
}
mutex_unlock(&pinctrldev_list_mutex);
return found ? pctldev : NULL;
}
struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev, int pin)
{
struct pin_desc *pindesc;
unsigned long flags;
spin_lock_irqsave(&pctldev->pin_desc_tree_lock, flags);
pindesc = radix_tree_lookup(&pctldev->pin_desc_tree, pin);
spin_unlock_irqrestore(&pctldev->pin_desc_tree_lock, flags);
return pindesc;
}
/**
* pin_is_valid() - check if pin exists on controller
* @pctldev: the pin control device to check the pin on
* @pin: pin to check, use the local pin controller index number
*
* This tells us whether a certain pin exist on a certain pin controller or
* not. Pin lists may be sparse, so some pins may not exist.
*/
bool pin_is_valid(struct pinctrl_dev *pctldev, int pin)
{
struct pin_desc *pindesc;
if (pin < 0)
return false;
pindesc = pin_desc_get(pctldev, pin);
if (pindesc == NULL)
return false;
return true;
}
EXPORT_SYMBOL_GPL(pin_is_valid);
/* Deletes a range of pin descriptors */
static void pinctrl_free_pindescs(struct pinctrl_dev *pctldev,
const struct pinctrl_pin_desc *pins,
unsigned num_pins)
{
int i;
spin_lock(&pctldev->pin_desc_tree_lock);
for (i = 0; i < num_pins; i++) {
struct pin_desc *pindesc;
pindesc = radix_tree_lookup(&pctldev->pin_desc_tree,
pins[i].number);
if (pindesc != NULL) {
radix_tree_delete(&pctldev->pin_desc_tree,
pins[i].number);
}
kfree(pindesc);
}
spin_unlock(&pctldev->pin_desc_tree_lock);
}
static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev,
unsigned number, const char *name)
{
struct pin_desc *pindesc;
pindesc = pin_desc_get(pctldev, number);
if (pindesc != NULL) {
pr_err("pin %d already registered on %s\n", number,
pctldev->desc->name);
return -EINVAL;
}
pindesc = kzalloc(sizeof(*pindesc), GFP_KERNEL);
if (pindesc == NULL)
return -ENOMEM;
spin_lock_init(&pindesc->lock);
/* Set owner */
pindesc->pctldev = pctldev;
/* Copy optional basic pin info */
if (name)
strlcpy(pindesc->name, name, sizeof(pindesc->name));
spin_lock(&pctldev->pin_desc_tree_lock);
radix_tree_insert(&pctldev->pin_desc_tree, number, pindesc);
spin_unlock(&pctldev->pin_desc_tree_lock);
pr_debug("registered pin %d (%s) on %s\n",
number, name ? name : "(unnamed)", pctldev->desc->name);
return 0;
}
static int pinctrl_register_pins(struct pinctrl_dev *pctldev,
struct pinctrl_pin_desc const *pins,
unsigned num_descs)
{
unsigned i;
int ret = 0;
for (i = 0; i < num_descs; i++) {
ret = pinctrl_register_one_pin(pctldev,
pins[i].number, pins[i].name);
if (ret)
return ret;
}
return 0;
}
/**
* pinctrl_match_gpio_range() - check if a certain GPIO pin is in range
* @pctldev: pin controller device to check
* @gpio: gpio pin to check taken from the global GPIO pin space
*
* Tries to match a GPIO pin number to the ranges handled by a certain pin
* controller, return the range or NULL
*/
static struct pinctrl_gpio_range *
pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, unsigned gpio)
{
struct pinctrl_gpio_range *range = NULL;
/* Loop over the ranges */
mutex_lock(&pctldev->gpio_ranges_lock);
list_for_each_entry(range, &pctldev->gpio_ranges, node) {
/* Check if we're in the valid range */
if (gpio >= range->base &&
gpio < range->base + range->npins) {
mutex_unlock(&pctldev->gpio_ranges_lock);
return range;
}
}
mutex_unlock(&pctldev->gpio_ranges_lock);
return NULL;
}
/**
* pinctrl_get_device_gpio_range() - find device for GPIO range
* @gpio: the pin to locate the pin controller for
* @outdev: the pin control device if found
* @outrange: the GPIO range if found
*
* Find the pin controller handling a certain GPIO pin from the pinspace of
* the GPIO subsystem, return the device and the matching GPIO range. Returns
* negative if the GPIO range could not be found in any device.
*/
int pinctrl_get_device_gpio_range(unsigned gpio,
struct pinctrl_dev **outdev,
struct pinctrl_gpio_range **outrange)
{
struct pinctrl_dev *pctldev = NULL;
/* Loop over the pin controllers */
mutex_lock(&pinctrldev_list_mutex);
list_for_each_entry(pctldev, &pinctrldev_list, node) {
struct pinctrl_gpio_range *range;
range = pinctrl_match_gpio_range(pctldev, gpio);
if (range != NULL) {
*outdev = pctldev;
*outrange = range;
mutex_unlock(&pinctrldev_list_mutex);
return 0;
}
}
mutex_unlock(&pinctrldev_list_mutex);
return -EINVAL;
}
/**
* pinctrl_add_gpio_range() - register a GPIO range for a controller
* @pctldev: pin controller device to add the range to
* @range: the GPIO range to add
*
* This adds a range of GPIOs to be handled by a certain pin controller. Call
* this to register handled ranges after registering your pin controller.
*/
void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range)
{
mutex_lock(&pctldev->gpio_ranges_lock);
list_add(&range->node, &pctldev->gpio_ranges);
mutex_unlock(&pctldev->gpio_ranges_lock);
}
/**
* pinctrl_remove_gpio_range() - remove a range of GPIOs fro a pin controller
* @pctldev: pin controller device to remove the range from
* @range: the GPIO range to remove
*/
void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range)
{
mutex_lock(&pctldev->gpio_ranges_lock);
list_del(&range->node);
mutex_unlock(&pctldev->gpio_ranges_lock);
}
#ifdef CONFIG_DEBUG_FS
static int pinctrl_pins_show(struct seq_file *s, void *what)
{
struct pinctrl_dev *pctldev = s->private;
const struct pinctrl_ops *ops = pctldev->desc->pctlops;
unsigned pin;
seq_printf(s, "registered pins: %d\n", pctldev->desc->npins);
seq_printf(s, "max pin number: %d\n", pctldev->desc->maxpin);
/* The highest pin number need to be included in the loop, thus <= */
for (pin = 0; pin <= pctldev->desc->maxpin; pin++) {
struct pin_desc *desc;
desc = pin_desc_get(pctldev, pin);
/* Pin space may be sparse */
if (desc == NULL)
continue;
seq_printf(s, "pin %d (%s) ", pin,
desc->name ? desc->name : "unnamed");
/* Driver-specific info per pin */
if (ops->pin_dbg_show)
ops->pin_dbg_show(pctldev, s, pin);
seq_puts(s, "\n");
}
return 0;
}
static int pinctrl_groups_show(struct seq_file *s, void *what)
{
struct pinctrl_dev *pctldev = s->private;
const struct pinctrl_ops *ops = pctldev->desc->pctlops;
unsigned selector = 0;
/* No grouping */
if (!ops)
return 0;
seq_puts(s, "registered pin groups:\n");
while (ops->list_groups(pctldev, selector) >= 0) {
unsigned *pins;
unsigned num_pins;
const char *gname = ops->get_group_name(pctldev, selector);
int ret;
int i;
ret = ops->get_group_pins(pctldev, selector,
&pins, &num_pins);
if (ret)
seq_printf(s, "%s [ERROR GETTING PINS]\n",
gname);
else {
seq_printf(s, "group: %s, pins = [ ", gname);
for (i = 0; i < num_pins; i++)
seq_printf(s, "%d ", pins[i]);
seq_puts(s, "]\n");
}
selector++;
}
return 0;
}
static int pinctrl_gpioranges_show(struct seq_file *s, void *what)
{
struct pinctrl_dev *pctldev = s->private;
struct pinctrl_gpio_range *range = NULL;
seq_puts(s, "GPIO ranges handled:\n");
/* Loop over the ranges */
mutex_lock(&pctldev->gpio_ranges_lock);
list_for_each_entry(range, &pctldev->gpio_ranges, node) {
seq_printf(s, "%u: %s [%u - %u]\n", range->id, range->name,
range->base, (range->base + range->npins - 1));
}
mutex_unlock(&pctldev->gpio_ranges_lock);
return 0;
}
static int pinctrl_devices_show(struct seq_file *s, void *what)
{
struct pinctrl_dev *pctldev;
seq_puts(s, "name [pinmux]\n");
mutex_lock(&pinctrldev_list_mutex);
list_for_each_entry(pctldev, &pinctrldev_list, node) {
seq_printf(s, "%s ", pctldev->desc->name);
if (pctldev->desc->pmxops)
seq_puts(s, "yes");
else
seq_puts(s, "no");
seq_puts(s, "\n");
}
mutex_unlock(&pinctrldev_list_mutex);
return 0;
}
static int pinctrl_pins_open(struct inode *inode, struct file *file)
{
return single_open(file, pinctrl_pins_show, inode->i_private);
}
static int pinctrl_groups_open(struct inode *inode, struct file *file)
{
return single_open(file, pinctrl_groups_show, inode->i_private);
}
static int pinctrl_gpioranges_open(struct inode *inode, struct file *file)
{
return single_open(file, pinctrl_gpioranges_show, inode->i_private);
}
static int pinctrl_devices_open(struct inode *inode, struct file *file)
{
return single_open(file, pinctrl_devices_show, NULL);
}
static const struct file_operations pinctrl_pins_ops = {
.open = pinctrl_pins_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static const struct file_operations pinctrl_groups_ops = {
.open = pinctrl_groups_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static const struct file_operations pinctrl_gpioranges_ops = {
.open = pinctrl_gpioranges_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static const struct file_operations pinctrl_devices_ops = {
.open = pinctrl_devices_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static struct dentry *debugfs_root;
static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
{
static struct dentry *device_root;
device_root = debugfs_create_dir(dev_name(&pctldev->dev),
debugfs_root);
if (IS_ERR(device_root) || !device_root) {
pr_warn("failed to create debugfs directory for %s\n",
dev_name(&pctldev->dev));
return;
}
debugfs_create_file("pins", S_IFREG | S_IRUGO,
device_root, pctldev, &pinctrl_pins_ops);
debugfs_create_file("pingroups", S_IFREG | S_IRUGO,
device_root, pctldev, &pinctrl_groups_ops);
debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO,
device_root, pctldev, &pinctrl_gpioranges_ops);
pinmux_init_device_debugfs(device_root, pctldev);
}
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("pinctrl-devices", S_IFREG | S_IRUGO,
debugfs_root, NULL, &pinctrl_devices_ops);
pinmux_init_debugfs(debugfs_root);
}
#else /* CONFIG_DEBUG_FS */
static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
{
}
static void pinctrl_init_debugfs(void)
{
}
#endif
/**
* pinctrl_register() - register a pin controller device
* @pctldesc: descriptor for this pin controller
* @dev: parent device for this pin controller
* @driver_data: private pin controller data for this pin controller
*/
struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
struct device *dev, void *driver_data)
{
static atomic_t pinmux_no = ATOMIC_INIT(0);
struct pinctrl_dev *pctldev;
int ret;
if (pctldesc == NULL)
return NULL;
if (pctldesc->name == NULL)
return NULL;
/* If we're implementing pinmuxing, check the ops for sanity */
if (pctldesc->pmxops) {
ret = pinmux_check_ops(pctldesc->pmxops);
if (ret) {
pr_err("%s pinmux ops lacks necessary functions\n",
pctldesc->name);
return NULL;
}
}
pctldev = kzalloc(sizeof(struct pinctrl_dev), GFP_KERNEL);
if (pctldev == NULL)
return NULL;
/* Initialize pin control device struct */
pctldev->owner = pctldesc->owner;
pctldev->desc = pctldesc;
pctldev->driver_data = driver_data;
INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL);
spin_lock_init(&pctldev->pin_desc_tree_lock);
INIT_LIST_HEAD(&pctldev->gpio_ranges);
mutex_init(&pctldev->gpio_ranges_lock);
/* Register device */
pctldev->dev.parent = dev;
dev_set_name(&pctldev->dev, "pinctrl.%d",
atomic_inc_return(&pinmux_no) - 1);
pctldev->dev.release = pinctrl_dev_release;
ret = device_register(&pctldev->dev);
if (ret != 0) {
pr_err("error in device registration\n");
goto out_reg_dev_err;
}
dev_set_drvdata(&pctldev->dev, pctldev);
/* Register all the pins */
pr_debug("try to register %d pins on %s...\n",
pctldesc->npins, pctldesc->name);
ret = pinctrl_register_pins(pctldev, pctldesc->pins, pctldesc->npins);
if (ret) {
pr_err("error during pin registration\n");
pinctrl_free_pindescs(pctldev, pctldesc->pins,
pctldesc->npins);
goto out_reg_pins_err;
}
pinctrl_init_device_debugfs(pctldev);
mutex_lock(&pinctrldev_list_mutex);
list_add(&pctldev->node, &pinctrldev_list);
mutex_unlock(&pinctrldev_list_mutex);
pinmux_hog_maps(pctldev);
return pctldev;
out_reg_pins_err:
device_del(&pctldev->dev);
out_reg_dev_err:
put_device(&pctldev->dev);
return NULL;
}
EXPORT_SYMBOL_GPL(pinctrl_register);
/**
* pinctrl_unregister() - unregister pinmux
* @pctldev: pin controller to unregister
*
* Called by pinmux drivers to unregister a pinmux.
*/
void pinctrl_unregister(struct pinctrl_dev *pctldev)
{
if (pctldev == NULL)
return;
pinmux_unhog_maps(pctldev);
/* TODO: check that no pinmuxes are still active? */
mutex_lock(&pinctrldev_list_mutex);
list_del(&pctldev->node);
mutex_unlock(&pinctrldev_list_mutex);
/* Destroy descriptor tree */
pinctrl_free_pindescs(pctldev, pctldev->desc->pins,
pctldev->desc->npins);
device_unregister(&pctldev->dev);
}
EXPORT_SYMBOL_GPL(pinctrl_unregister);
static int __init pinctrl_init(void)
{
pr_info("initialized pinctrl subsystem\n");
pinctrl_init_debugfs();
return 0;
}
/* init early since many drivers really need to initialized pinmux early */
core_initcall(pinctrl_init);

72
drivers/pinctrl/core.h 100644
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@ -0,0 +1,72 @@
/*
* Core private header for the pin control subsystem
*
* Copyright (C) 2011 ST-Ericsson SA
* Written on behalf of Linaro for ST-Ericsson
*
* Author: Linus Walleij <linus.walleij@linaro.org>
*
* License terms: GNU General Public License (GPL) version 2
*/
/**
* struct pinctrl_dev - pin control class device
* @node: node to include this pin controller in the global pin controller list
* @desc: the pin controller descriptor supplied when initializing this pin
* controller
* @pin_desc_tree: each pin descriptor for this pin controller is stored in
* this radix tree
* @pin_desc_tree_lock: lock for the descriptor tree
* @gpio_ranges: a list of GPIO ranges that is handled by this pin controller,
* ranges are added to this list at runtime
* @gpio_ranges_lock: lock for the GPIO ranges list
* @dev: the device entry for this pin controller
* @owner: module providing the pin controller, used for refcounting
* @driver_data: driver data for drivers registering to the pin controller
* subsystem
* @pinmux_hogs_lock: lock for the pinmux hog list
* @pinmux_hogs: list of pinmux maps hogged by this device
*/
struct pinctrl_dev {
struct list_head node;
struct pinctrl_desc *desc;
struct radix_tree_root pin_desc_tree;
spinlock_t pin_desc_tree_lock;
struct list_head gpio_ranges;
struct mutex gpio_ranges_lock;
struct device dev;
struct module *owner;
void *driver_data;
#ifdef CONFIG_PINMUX
struct mutex pinmux_hogs_lock;
struct list_head pinmux_hogs;
#endif
};
/**
* struct pin_desc - pin descriptor for each physical pin in the arch
* @pctldev: corresponding pin control device
* @name: a name for the pin, e.g. the name of the pin/pad/finger on a
* datasheet or such
* @lock: a lock to protect the descriptor structure
* @mux_requested: whether the pin is already requested by pinmux or not
* @mux_function: a named muxing function for the pin that will be passed to
* subdrivers and shown in debugfs etc
*/
struct pin_desc {
struct pinctrl_dev *pctldev;
char name[16];
spinlock_t lock;
/* These fields only added when supporting pinmux drivers */
#ifdef CONFIG_PINMUX
bool mux_requested;
char mux_function[16];
#endif
};
struct pinctrl_dev *get_pinctrl_dev_from_dev(struct device *dev,
const char *dev_name);
struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev, int pin);
int pinctrl_get_device_gpio_range(unsigned gpio,
struct pinctrl_dev **outdev,
struct pinctrl_gpio_range **outrange);

1180
drivers/pinctrl/pinmux.c 100644
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47
drivers/pinctrl/pinmux.h 100644
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@ -0,0 +1,47 @@
/*
* Internal interface between the core pin control system and the
* pinmux portions
*
* 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
*/
#ifdef CONFIG_PINMUX
int pinmux_check_ops(const struct pinmux_ops *ops);
void pinmux_init_device_debugfs(struct dentry *devroot,
struct pinctrl_dev *pctldev);
void pinmux_init_debugfs(struct dentry *subsys_root);
int pinmux_hog_maps(struct pinctrl_dev *pctldev);
void pinmux_unhog_maps(struct pinctrl_dev *pctldev);
#else
static inline int pinmux_check_ops(const struct pinmux_ops *ops)
{
return 0;
}
static inline void pinmux_init_device_debugfs(struct dentry *devroot,
struct pinctrl_dev *pctldev)
{
}
static inline void pinmux_init_debugfs(struct dentry *subsys_root)
{
}
static inline int pinmux_hog_maps(struct pinctrl_dev *pctldev)
{
return 0;
}
static inline void pinmux_unhog_maps(struct pinctrl_dev *pctldev)
{
}
#endif

107
include/linux/pinctrl/machine.h 100644
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@ -0,0 +1,107 @@
/*
* 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
* @name: the name of this specific map entry for the particular machine.
* This is the second parameter passed to pinmux_get() when you want
* to have several mappings to the same device
* @ctrl_dev: the pin control device to be used by this mapping, may be NULL
* if you provide .ctrl_dev_name instead (this is more common)
* @ctrl_dev_name: the name of the device controlling this specific mapping,
* the name must be the same as in your struct device*, may be NULL if
* you provide .ctrl_dev instead
* @function: a function in the driver to use for this mapping, the driver
* will lookup the function referenced by this ID on the specified
* pin control device
* @group: sometimes a function can map to different pin groups, so this
* selects a certain specific pin group to activate for the function, if
* left as NULL, the first applicable group will be used
* @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 as in your struct device*, may be NULL if you
* provide .dev instead
* @hog_on_boot: if this is set to true, the pin control subsystem will itself
* hog the mappings as the pinmux device drivers are attached, so this is
* typically used with system maps (mux mappings without an assigned
* device) that you want to get hogged and enabled by default as soon as
* a pinmux device supporting it is registered. These maps will not be
* disabled and put until the system shuts down.
*/
struct pinmux_map {
const char *name;
struct device *ctrl_dev;
const char *ctrl_dev_name;
const char *function;
const char *group;
struct device *dev;
const char *dev_name;
const bool hog_on_boot;
};
/*
* Convenience macro to set a simple map from a certain pin controller and a
* certain function to a named device
*/
#define PINMUX_MAP(a, b, c, d) \
{ .name = a, .ctrl_dev_name = b, .function = c, .dev_name = d }
/*
* Convenience macro to map a system function onto a certain pinctrl device.
* System functions are not assigned to a particular device.
*/
#define PINMUX_MAP_SYS(a, b, c) \
{ .name = a, .ctrl_dev_name = b, .function = c }
/*
* Convenience macro to map a function onto the primary device pinctrl device
* this is especially helpful on systems that have only one pin controller
* or need to set up a lot of mappings on the primary controller.
*/
#define PINMUX_MAP_PRIMARY(a, b, c) \
{ .name = a, .ctrl_dev_name = "pinctrl.0", .function = b, \
.dev_name = c }
/*
* Convenience macro to map a system function onto the primary pinctrl device.
* System functions are not assigned to a particular device.
*/
#define PINMUX_MAP_PRIMARY_SYS(a, b) \
{ .name = a, .ctrl_dev_name = "pinctrl.0", .function = b }
/*
* Convenience macro to map a system function onto the primary pinctrl device,
* to be hogged by the pinmux core until the system shuts down.
*/
#define PINMUX_MAP_PRIMARY_SYS_HOG(a, b) \
{ .name = a, .ctrl_dev_name = "pinctrl.0", .function = b, \
.hog_on_boot = true }
#ifdef CONFIG_PINMUX
extern int pinmux_register_mappings(struct pinmux_map const *map,
unsigned num_maps);
#else
static inline int pinmux_register_mappings(struct pinmux_map const *map,
unsigned num_maps)
{
return 0;
}
#endif /* !CONFIG_PINMUX */
#endif

133
include/linux/pinctrl/pinctrl.h 100644
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@ -0,0 +1,133 @@
/*
* Interface the pinctrl subsystem
*
* Copyright (C) 2011 ST-Ericsson SA
* Written on behalf of Linaro for ST-Ericsson
* This interface is used in the core to keep track of pins.
*
* Author: Linus Walleij <linus.walleij@linaro.org>
*
* License terms: GNU General Public License (GPL) version 2
*/
#ifndef __LINUX_PINCTRL_PINCTRL_H
#define __LINUX_PINCTRL_PINCTRL_H
#ifdef CONFIG_PINCTRL
#include <linux/radix-tree.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/seq_file.h>
struct pinctrl_dev;
struct pinmux_ops;
struct gpio_chip;
/**
* 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 }
/**
* struct pinctrl_gpio_range - each pin controller can provide subranges of
* the GPIO number space to be handled by the controller
* @node: list node for internal use
* @name: a name for the chip in this range
* @id: an ID number for the chip in this range
* @base: base offset of the GPIO range
* @npins: number of pins in the GPIO range, including the base number
* @gc: an optional pointer to a gpio_chip
*/
struct pinctrl_gpio_range {
struct list_head node;
const char *name;
unsigned int id;
unsigned int base;
unsigned int npins;
struct gpio_chip *gc;
};
/**
* struct pinctrl_ops - global pin control operations, to be implemented by
* pin controller drivers.
* @list_groups: list the number of selectable named groups available
* in this pinmux driver, the core will begin on 0 and call this
* repeatedly as long as it returns >= 0 to enumerate the groups
* @get_group_name: return the group name of the pin group
* @get_group_pins: return an array of pins corresponding to a certain
* group selector @pins, and the size of the array in @num_pins
* @pin_dbg_show: optional debugfs display hook that will provide per-device
* info for a certain pin in debugfs
*/
struct pinctrl_ops {
int (*list_groups) (struct pinctrl_dev *pctldev, unsigned selector);
const char *(*get_group_name) (struct pinctrl_dev *pctldev,
unsigned selector);
int (*get_group_pins) (struct pinctrl_dev *pctldev,
unsigned selector,
unsigned ** const pins,
unsigned * const num_pins);
void (*pin_dbg_show) (struct pinctrl_dev *pctldev, struct seq_file *s,
unsigned offset);
};
/**
* struct pinctrl_desc - pin controller descriptor, register this to pin
* control subsystem
* @name: name for the pin controller
* @pins: an array of pin descriptors describing all the pins handled by
* this pin controller
* @npins: number of descriptors in the array, usually just ARRAY_SIZE()
* of the pins field above
* @maxpin: since pin spaces may be sparse, there can he "holes" in the
* pin range, this attribute gives the maximum pin number in the
* total range. This should not be lower than npins for example,
* but may be equal to npins if you have no holes in the pin range.
* @pctlops: pin control operation vtable, to support global concepts like
* grouping of pins, this is optional.
* @pmxops: pinmux operation vtable, if you support pinmuxing in your driver
* @owner: module providing the pin controller, used for refcounting
*/
struct pinctrl_desc {
const char *name;
struct pinctrl_pin_desc const *pins;
unsigned int npins;
unsigned int maxpin;
struct pinctrl_ops *pctlops;
struct pinmux_ops *pmxops;
struct module *owner;
};
/* External interface to pin controller */
extern struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
struct device *dev, void *driver_data);
extern void pinctrl_unregister(struct pinctrl_dev *pctldev);
extern bool pin_is_valid(struct pinctrl_dev *pctldev, int pin);
extern void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range);
extern void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range);
extern const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev);
extern void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev);
#else
/* Sufficiently stupid default function when pinctrl is not in use */
static inline bool pin_is_valid(struct pinctrl_dev *pctldev, int pin)
{
return pin >= 0;
}
#endif /* !CONFIG_PINCTRL */
#endif /* __LINUX_PINCTRL_PINCTRL_H */

117
include/linux/pinctrl/pinmux.h 100644
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@ -0,0 +1,117 @@
/*
* 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>
#include "pinctrl.h"
/* This struct is private to the core and should be regarded as a cookie */
struct pinmux;
#ifdef CONFIG_PINMUX
struct pinctrl_dev;
/**
* struct pinmux_ops - pinmux operations, to be implemented by pin controller
* drivers that support pinmuxing
* @request: called by the core to see if a certain pin can be made available
* available for muxing. This is called by the core to acquire the pins
* before selecting any actual mux setting across a function. The driver
* is allowed to answer "no" by returning a negative error code
* @free: the reverse function of the request() callback, frees a pin after
* being requested
* @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_groups: return an array of groups names (in turn
* referencing pins) connected to a certain function selector. The group
* name can be used with the generic @pinctrl_ops to retrieve the
* actual pins affected. The applicable groups will be returned in
* @groups and the number of groups in @num_groups
* @enable: enable a certain muxing function with a certain pin group. The
* driver does not need to figure out whether enabling this function
* conflicts some other use of the pins in that group, such collisions
* are handled by the pinmux subsystem. The @func_selector selects a
* certain function whereas @group_selector selects a certain set of pins
* to be used. On simple controllers the latter argument may be ignored
* @disable: disable a certain muxing selector with a certain pin group
* @gpio_request_enable: requests and enables GPIO on a certain pin.
* Implement this only if you can mux every pin individually as GPIO. The
* affected GPIO range is passed along with an offset into that
* specific GPIO range - function selectors and pin groups are orthogonal
* to this, the core will however make sure the pins do not collide
*/
struct pinmux_ops {
int (*request) (struct pinctrl_dev *pctldev, unsigned offset);
int (*free) (struct pinctrl_dev *pctldev, unsigned offset);
int (*list_functions) (struct pinctrl_dev *pctldev, unsigned selector);
const char *(*get_function_name) (struct pinctrl_dev *pctldev,
unsigned selector);
int (*get_function_groups) (struct pinctrl_dev *pctldev,
unsigned selector,
const char * const **groups,
unsigned * const num_groups);
int (*enable) (struct pinctrl_dev *pctldev, unsigned func_selector,
unsigned group_selector);
void (*disable) (struct pinctrl_dev *pctldev, unsigned func_selector,
unsigned group_selector);
int (*gpio_request_enable) (struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned offset);
};
/* External interface to pinmux */
extern int pinmux_request_gpio(unsigned gpio);
extern void pinmux_free_gpio(unsigned gpio);
extern struct pinmux * __must_check pinmux_get(struct device *dev, const char *name);
extern void pinmux_put(struct pinmux *pmx);
extern int pinmux_enable(struct pinmux *pmx);
extern void pinmux_disable(struct pinmux *pmx);
#else /* !CONFIG_PINMUX */
static inline int pinmux_request_gpio(unsigned gpio)
{
return 0;
}
static inline void pinmux_free_gpio(unsigned gpio)
{
}
static inline struct pinmux * __must_check pinmux_get(struct device *dev, const char *name)
{
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)
{
}
#endif /* CONFIG_PINMUX */
#endif /* __LINUX_PINCTRL_PINMUX_H */