1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Interface the pinmux subsystem
5 * Copyright (C) 2011 ST-Ericsson SA
6 * Written on behalf of Linaro for ST-Ericsson
7 * Based on bits of regulator core, gpio core and clk core
9 * Author: Linus Walleij <linus.walleij@linaro.org>
11 #ifndef __LINUX_PINCTRL_PINMUX_H
12 #define __LINUX_PINCTRL_PINMUX_H
14 #include <linux/list.h>
15 #include <linux/seq_file.h>
16 #include <linux/pinctrl/pinctrl.h>
23 * struct pinmux_ops - pinmux operations, to be implemented by pin controller
24 * drivers that support pinmuxing
25 * @request: called by the core to see if a certain pin can be made
26 * available for muxing. This is called by the core to acquire the pins
27 * before selecting any actual mux setting across a function. The driver
28 * is allowed to answer "no" by returning a negative error code
29 * @free: the reverse function of the request() callback, frees a pin after
31 * @get_functions_count: returns number of selectable named functions available
32 * in this pinmux driver
33 * @get_function_name: return the function name of the muxing selector,
34 * called by the core to figure out which mux setting it shall map a
36 * @get_function_groups: return an array of groups names (in turn
37 * referencing pins) connected to a certain function selector. The group
38 * name can be used with the generic @pinctrl_ops to retrieve the
39 * actual pins affected. The applicable groups will be returned in
40 * @groups and the number of groups in @num_groups
41 * @set_mux: enable a certain muxing function with a certain pin group. The
42 * driver does not need to figure out whether enabling this function
43 * conflicts some other use of the pins in that group, such collisions
44 * are handled by the pinmux subsystem. The @func_selector selects a
45 * certain function whereas @group_selector selects a certain set of pins
46 * to be used. On simple controllers the latter argument may be ignored
47 * @gpio_request_enable: requests and enables GPIO on a certain pin.
48 * Implement this only if you can mux every pin individually as GPIO. The
49 * affected GPIO range is passed along with an offset(pin number) into that
50 * specific GPIO range - function selectors and pin groups are orthogonal
51 * to this, the core will however make sure the pins do not collide.
52 * @gpio_disable_free: free up GPIO muxing on a certain pin, the reverse of
53 * @gpio_request_enable
54 * @gpio_set_direction: Since controllers may need different configurations
55 * depending on whether the GPIO is configured as input or output,
56 * a direction selector function may be implemented as a backing
57 * to the GPIO controllers that need pin muxing.
58 * @strict: do not allow simultaneous use of the same pin for GPIO and another
59 * function. Check both gpio_owner and mux_owner strictly before approving
63 int (*request) (struct pinctrl_dev *pctldev, unsigned offset);
64 int (*free) (struct pinctrl_dev *pctldev, unsigned offset);
65 int (*get_functions_count) (struct pinctrl_dev *pctldev);
66 const char *(*get_function_name) (struct pinctrl_dev *pctldev,
68 int (*get_function_groups) (struct pinctrl_dev *pctldev,
70 const char * const **groups,
71 unsigned *num_groups);
72 int (*set_mux) (struct pinctrl_dev *pctldev, unsigned func_selector,
73 unsigned group_selector);
74 int (*gpio_request_enable) (struct pinctrl_dev *pctldev,
75 struct pinctrl_gpio_range *range,
77 void (*gpio_disable_free) (struct pinctrl_dev *pctldev,
78 struct pinctrl_gpio_range *range,
80 int (*gpio_set_direction) (struct pinctrl_dev *pctldev,
81 struct pinctrl_gpio_range *range,
87 #endif /* CONFIG_PINMUX */
89 #endif /* __LINUX_PINCTRL_PINMUX_H */