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usr
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src
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linux-headers-6.8.0-101
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include
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linux
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pinctrl
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Filename :
pinmux.h
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/* 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/types.h> struct pinctrl_dev; struct pinctrl_gpio_range; /** * 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 int offset); int (*free) (struct pinctrl_dev *pctldev, unsigned int offset); int (*get_functions_count) (struct pinctrl_dev *pctldev); const char *(*get_function_name) (struct pinctrl_dev *pctldev, unsigned int selector); int (*get_function_groups) (struct pinctrl_dev *pctldev, unsigned int selector, const char * const **groups, unsigned int *num_groups); int (*set_mux) (struct pinctrl_dev *pctldev, unsigned int func_selector, unsigned int group_selector); int (*gpio_request_enable) (struct pinctrl_dev *pctldev, struct pinctrl_gpio_range *range, unsigned int offset); void (*gpio_disable_free) (struct pinctrl_dev *pctldev, struct pinctrl_gpio_range *range, unsigned int offset); int (*gpio_set_direction) (struct pinctrl_dev *pctldev, struct pinctrl_gpio_range *range, unsigned int offset, bool input); bool strict; }; #endif /* __LINUX_PINCTRL_PINMUX_H */