86 lines
3.8 KiB
C
86 lines
3.8 KiB
C
|
/* 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 */
|