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* 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 <>
* License terms: GNU General Public License (GPL) version 2
#include <linux/radix-tree.h>
#include <linux/list.h>
#include <linux/seq_file.h>
#include <linux/pinctrl/pinctrl-state.h>
struct device;
struct pinctrl_dev;
struct pinctrl_map;
struct pinmux_ops;
struct pinconf_ops;
struct pin_config_item;
struct gpio_chip;
struct device_node;
* 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
* @drv_data: driver-defined per-pin data. pinctrl core does not touch this
struct pinctrl_pin_desc {
unsigned number;
const char *name;
void *drv_data;
/* 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
* @pin_base: base pin number of the GPIO range if pins == NULL
* @pins: enumeration of pins in GPIO range or NULL
* @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 pin_base;
unsigned const *pins;
unsigned int npins;
struct gpio_chip *gc;
* struct pinctrl_ops - global pin control operations, to be implemented by
* pin controller drivers.
* @get_groups_count: Returns the count of total number of groups registered.
* @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
* @dt_node_to_map: parse a device tree "pin configuration node", and create
* mapping table entries for it. These are returned through the @map and
* @num_maps output parameters. This function is optional, and may be
* omitted for pinctrl drivers that do not support device tree.
* @dt_free_map: free mapping table entries created via @dt_node_to_map. The
* top-level @map pointer must be freed, along with any dynamically
* allocated members of the mapping table entries themselves. This
* function is optional, and may be omitted for pinctrl drivers that do
* not support device tree.
struct pinctrl_ops {
int (*get_groups_count) (struct pinctrl_dev *pctldev);
const char *(*get_group_name) (struct pinctrl_dev *pctldev,
unsigned selector);
int (*get_group_pins) (struct pinctrl_dev *pctldev,
unsigned selector,
const unsigned **pins,
unsigned *num_pins);
void (*pin_dbg_show) (struct pinctrl_dev *pctldev, struct seq_file *s,
unsigned offset);
int (*dt_node_to_map) (struct pinctrl_dev *pctldev,
struct device_node *np_config,
struct pinctrl_map **map, unsigned *num_maps);
void (*dt_free_map) (struct pinctrl_dev *pctldev,
struct pinctrl_map *map, unsigned num_maps);
* 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
* @pctlops: pin control operation vtable, to support global concepts like
* grouping of pins, this is optional.
* @pmxops: pinmux operations vtable, if you support pinmuxing in your driver
* @confops: pin config operations vtable, if you support pin configuration in
* your driver
* @owner: module providing the pin controller, used for refcounting
* @num_custom_params: Number of driver-specific custom parameters to be parsed
* from the hardware description
* @custom_params: List of driver_specific custom parameters to be parsed from
* the hardware description
* @custom_conf_items: Information how to print @params in debugfs, must be
* the same size as the @custom_params, i.e. @num_custom_params
struct pinctrl_desc {
const char *name;
const struct pinctrl_pin_desc *pins;
unsigned int npins;
const struct pinctrl_ops *pctlops;
const struct pinmux_ops *pmxops;
const struct pinconf_ops *confops;
struct module *owner;
unsigned int num_custom_params;
const struct pinconf_generic_params *custom_params;
const struct pin_config_item *custom_conf_items;
/* External interface to pin controller */
extern int pinctrl_register_and_init(struct pinctrl_desc *pctldesc,
struct device *dev, void *driver_data,
struct pinctrl_dev **pctldev);
extern int pinctrl_enable(struct pinctrl_dev *pctldev);
/* Please use pinctrl_register_and_init() and pinctrl_enable() instead */
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 int devm_pinctrl_register_and_init(struct device *dev,
struct pinctrl_desc *pctldesc,
void *driver_data,
struct pinctrl_dev **pctldev);
/* Please use devm_pinctrl_register_and_init() instead */
extern struct pinctrl_dev *devm_pinctrl_register(struct device *dev,
struct pinctrl_desc *pctldesc,
void *driver_data);
extern void devm_pinctrl_unregister(struct device *dev,
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_add_gpio_ranges(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *ranges,
unsigned nranges);
extern void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range);
extern struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname,
struct pinctrl_gpio_range *range);
extern struct pinctrl_gpio_range *
pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev,
unsigned int pin);
extern int pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
const char *pin_group, const unsigned **pins,
unsigned *num_pins);
#ifdef CONFIG_OF
extern struct pinctrl_dev *of_pinctrl_get(struct device_node *np);
static inline
struct pinctrl_dev *of_pinctrl_get(struct device_node *np)
return NULL;
#endif /* CONFIG_OF */
extern const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev);
extern const char *pinctrl_dev_get_devname(struct pinctrl_dev *pctldev);
extern void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev);
struct pinctrl_dev;
/* Sufficiently stupid default functions when pinctrl is not in use */
static inline bool pin_is_valid(struct pinctrl_dev *pctldev, int pin)
return pin >= 0;
#endif /* !CONFIG_PINCTRL */