1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* 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>
*/
#ifndef __LINUX_PINCTRL_PINMUX_H
#define __LINUX_PINCTRL_PINMUX_H
#include <linux/list.h>
#include <linux/seq_file.h>
#include <linux/pinctrl/pinctrl.h>
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 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
* @get_functions_count: returns number of selectable named functions available
* in this pinmux driver
* @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
* @set_mux: 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
* @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(pin number) 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.
* @gpio_disable_free: free up GPIO muxing on a certain pin, the reverse of
* @gpio_request_enable
* @gpio_set_direction: Since controllers may need different configurations
* depending on whether the GPIO is configured as input or output,
* a direction selector function may be implemented as a backing
* to the GPIO controllers that need pin muxing.
* @strict: do not allow simultaneous use of the same pin for GPIO and another
* function. Check both gpio_owner and mux_owner strictly before approving
* the pin request.
*/
struct pinmux_ops {
int (*request) (struct pinctrl_dev *pctldev, unsigned offset);
int (*free) (struct pinctrl_dev *pctldev, unsigned offset);
int (*get_functions_count) (struct pinctrl_dev *pctldev);
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 *num_groups);
int (*set_mux) (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);
void (*gpio_disable_free) (struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned offset);
int (*gpio_set_direction) (struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned offset,
bool input);
bool strict;
};
#endif /* __LINUX_PINCTRL_PINMUX_H */
|
