/* SPDX-License-Identifier: GPL-2.0+ */ /* * Copyright (C) 2015 Masahiro Yamada */ #ifndef __PINCTRL_H #define __PINCTRL_H #define PINNAME_SIZE 10 #define PINMUX_SIZE 80 /** * struct pinconf_param - pin config parameters * @property: Property name in DT nodes * @param: ID for this config parameter * @default_value: default value for this config parameter used in case * no value is specified in DT nodes */ struct pinconf_param { const char * const property; unsigned int param; u32 default_value; }; /** * struct pinctrl_ops - pin control operations, to be implemented by * pin controller drivers. * * set_state() is the only mandatory operation. You can implement your pinctrl * driver with its own @set_state. In this case, the other callbacks are not * required. Otherwise, generic pinctrl framework is also available; use * pinctrl_generic_set_state for @set_state, and implement other operations * depending on your necessity. */ struct pinctrl_ops { /** * @get_pins_count: Get the number of selectable pins * * @dev: Pinctrl device to use * * This function is necessary to parse the "pins" property in DTS. * * @Return: * number of selectable named pins available in this driver */ int (*get_pins_count)(struct udevice *dev); /** * @get_pin_name: Get the name of a pin * * @dev: Pinctrl device of the pin * * @selector: The pin selector * * This function is called by the core to figure out which pin it will * do operations to. This function is necessary to parse the "pins" * property in DTS. * * @Return: const pointer to the name of the pin */ const char *(*get_pin_name)(struct udevice *dev, unsigned selector); /** * @get_groups_count: Get the number of selectable groups * * @dev: Pinctrl device to use * * This function is necessary to parse the "groups" property in DTS. * * @Return: * number of selectable named groups available in the driver */ int (*get_groups_count)(struct udevice *dev); /** * @get_group_name: Get the name of a group * * @dev: Pinctrl device of the group * * @selector: The group selector * * This function is called by the core to figure out which group it * will do operations to. This function is necessary to parse the * "groups" property in DTS. * * @Return: Pointer to the name of the group */ const char *(*get_group_name)(struct udevice *dev, unsigned selector); /** * @get_functions_count: Get the number of selectable functions * * @dev: Pinctrl device to use * * This function is necessary for pin-muxing. * * @Return: * number of selectable named functions available in this driver */ int (*get_functions_count)(struct udevice *dev); /** * @get_function_name: Get the name of a function * * @dev: Pinmux device of the function * * @selector: The function selector * * This function is called by the core to figure out which mux setting * it will map a certain device to. This function is necessary for * pin-muxing. * * @Return: * Pointer to the function name of the muxing selector */ const char *(*get_function_name)(struct udevice *dev, unsigned selector); /** * @pinmux_set: Mux a pin to a function * * @dev: Pinctrl device to use * * @pin_selector: The pin selector * * @func_selector: The func selector * * On simple controllers one of @pin_selector or @func_selector may be * ignored. This function is necessary for pin-muxing against a single * pin. * * @Return: 0 if OK, or negative error code on failure */ int (*pinmux_set)(struct udevice *dev, unsigned pin_selector, unsigned func_selector); /** * @pinmux_group_set: Mux a group of pins to a function * * @dev: Pinctrl device to use * * @group_selector: The group selector * * @func_selector: The func selector * * On simple controllers one of @group_selector or @func_selector may be * ignored. This function is necessary for pin-muxing against a group of * pins. * * @Return: 0 if OK, or negative error code on failure */ int (*pinmux_group_set)(struct udevice *dev, unsigned group_selector, unsigned func_selector); /** * @pinmux_property_set: Enable a pinmux group * * @dev: Pinctrl device to use * * @pinmux_group: A u32 representing the pin identifier and mux * settings. The exact format of a pinmux group is left * up to the driver. * * Mux a single pin to a single function based on a driver-specific * pinmux group. This function is necessary for parsing the "pinmux" * property in DTS, and for pin-muxing against a pinmux group. * * @Return: * Pin selector for the muxed pin if OK, or negative error code on * failure */ int (*pinmux_property_set)(struct udevice *dev, u32 pinmux_group); /** * @pinconf_num_params: * Number of driver-specific parameters to be parsed from device * trees. This member is necessary for pin configuration. */ unsigned int pinconf_num_params; /** * @pinconf_params: * List of driver-specific parameters to be parsed from the device * tree. This member is necessary for pin configuration. */ const struct pinconf_param *pinconf_params; /** * @pinconf_set: Configure an individual pin with a parameter * * @dev: Pinctrl device to use * * @pin_selector: The pin selector * * @param: An &enum pin_config_param from @pinconf_params * * @argument: The argument to this param from the device tree, or * @pinconf_params.default_value * * This function is necessary for pin configuration against a single * pin. * * @Return: 0 if OK, or negative error code on failure */ int (*pinconf_set)(struct udevice *dev, unsigned pin_selector, unsigned param, unsigned argument); /** * @pinconf_group_set: Configure all pins in a group with a parameter * * @dev: Pinctrl device to use * * @pin_selector: The group selector * * @param: A &enum pin_config_param from * @pinconf_params * * @argument: The argument to this param from the device tree, or * @pinconf_params.default_value * * This function is necessary for pin configuration against a group of * pins. * * @Return: 0 if OK, or negative error code on failure */ int (*pinconf_group_set)(struct udevice *dev, unsigned group_selector, unsigned param, unsigned argument); /** * @set_state: Configure a pinctrl device * * @dev: Pinctrl device to use * * @config: Pseudo device pointing a config node * * This function is required to be implemented by all pinctrl drivers. * Drivers may set this member to pinctrl_generic_set_state(), which * will call other functions in &struct pinctrl_ops to parse * @config. * * @Return: 0 if OK, or negative error code on failure */ int (*set_state)(struct udevice *dev, struct udevice *config); /** * @set_state_simple: Configure a pinctrl device * * @dev: Pinctrl device to use * * @config: Pseudo-device pointing a config node * * This function is usually a simpler version of set_state(). Only the * first pinctrl device on the system is supported by this function. * * @Return: 0 if OK, or negative error code on failure */ int (*set_state_simple)(struct udevice *dev, struct udevice *periph); /** * @request: Request a particular pinctrl function * * @dev: Device to adjust (%UCLASS_PINCTRL) * * @func: Function number (driver-specific) * * This activates the selected function. * * @Return: 0 if OK, or negative error code on failure */ int (*request)(struct udevice *dev, int func, int flags); /** * @get_periph_id: Get the peripheral ID for a device * * @dev: Pinctrl device to use for decoding * * @periph: Device to check * * This generally looks at the peripheral's device tree node to work * out the peripheral ID. The return value is normally interpreted as * &enum periph_id. so long as this is defined by the platform (which it * should be). * * @Return: * Peripheral ID of @periph, or %-ENOENT on error */ int (*get_periph_id)(struct udevice *dev, struct udevice *periph); /** * @get_gpio_mux: Get the mux value for a particular GPIO * * @dev: Pinctrl device to use * * @banknum: GPIO bank number * * @index: GPIO index within the bank * * This allows the raw mux value for a GPIO to be obtained. It is * useful for displaying the function being used by that GPIO, such * as with the 'gpio' command. This function is internal to the GPIO * subsystem and should not be used by generic code. Typically it is * used by a GPIO driver with knowledge of the SoC pinctrl setup. * * @Return: * Mux value (SoC-specific, e.g. 0 for input, 1 for output) */ int (*get_gpio_mux)(struct udevice *dev, int banknum, int index); /** * @get_pin_muxing: Show pin muxing * * @dev: Pinctrl device to use * * @selector: Pin selector * * @buf: Buffer to fill with pin muxing description * * @size: Size of @buf * * This allows to display the muxing of a given pin. It's useful for * debug purposes to know if a pin is configured as GPIO or as an * alternate function and which one. Typically it is used by a PINCTRL * driver with knowledge of the SoC pinctrl setup. * * @Return: 0 if OK, or negative error code on failure */ int (*get_pin_muxing)(struct udevice *dev, unsigned int selector, char *buf, int size); /** * @gpio_request_enable: Request and enable GPIO on a certain pin. * * @dev: Pinctrl device to use * * @selector: Pin selector * * 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. * * @Return: * 0 if OK, or negative error code on failure */ int (*gpio_request_enable)(struct udevice *dev, unsigned int selector); /** * @gpio_disable_free: Free up GPIO muxing on a certain pin. * * @dev: Pinctrl device to use * * @selector: Pin selector * * This function is the reverse of @gpio_request_enable. * * @Return: 0 if OK, or negative error code on failure */ int (*gpio_disable_free)(struct udevice *dev, unsigned int selector); }; #define pinctrl_get_ops(dev) ((struct pinctrl_ops *)(dev)->driver->ops) /** * enum pin_config_param - Generic pin configuration parameters * * @PIN_CONFIG_BIAS_BUS_HOLD: The pin will be set to weakly latch so that it * weakly drives the last value on a tristate bus, also known as a "bus * holder", "bus keeper" or "repeater". This allows another device on the * bus to change the value by driving the bus high or low and switching to * tristate. The argument is ignored. * @PIN_CONFIG_BIAS_DISABLE: Disable any pin bias on the pin, a * transition from say pull-up to pull-down implies that you disable * pull-up in the process, this setting disables all biasing. * @PIN_CONFIG_BIAS_HIGH_IMPEDANCE: The pin will be set to a high impedance * mode, also know as "third-state" (tristate) or "high-Z" or "floating". * On output pins this effectively disconnects the pin, which is useful * if for example some other pin is going to drive the signal connected * to it for a while. Pins used for input are usually always high * impedance. * @PIN_CONFIG_BIAS_PULL_DOWN: The pin will be pulled down (usually with high * impedance to GROUND). If the argument is != 0 pull-down is enabled, * if it is 0, pull-down is total, i.e. the pin is connected to GROUND. * @PIN_CONFIG_BIAS_PULL_PIN_DEFAULT: The pin will be pulled up or down based * on embedded knowledge of the controller hardware, like current mux * function. The pull direction and possibly strength too will normally * be decided completely inside the hardware block and not be readable * from the kernel side. * If the argument is != 0 pull up/down is enabled, if it is 0, the * configuration is ignored. The proper way to disable it is to use * @PIN_CONFIG_BIAS_DISABLE. * @PIN_CONFIG_BIAS_PULL_UP: The pin will be pulled up (usually with high * impedance to VDD). If the argument is != 0 pull-up is enabled, * if it is 0, pull-up is total, i.e. the pin is connected to VDD. * @PIN_CONFIG_DRIVE_OPEN_DRAIN: The pin will be driven with open drain (open * collector) which means it is usually wired with other output ports * which are then pulled up with an external resistor. Setting this * config will enable open drain mode, the argument is ignored. * @PIN_CONFIG_DRIVE_OPEN_SOURCE: The pin will be driven with open source * (open emitter). Setting this config will enable open source mode, the * argument is ignored. * @PIN_CONFIG_DRIVE_PUSH_PULL: The pin will be driven actively high and * low, this is the most typical case and is typically achieved with two * active transistors on the output. Setting this config will enable * push-pull mode, the argument is ignored. * @PIN_CONFIG_DRIVE_STRENGTH: The pin will sink or source at most the current * passed as argument. The argument is in mA. * @PIN_CONFIG_DRIVE_STRENGTH_UA: The pin will sink or source at most the * current passed as argument. The argument is in uA. * @PIN_CONFIG_INPUT_DEBOUNCE: This will configure the pin to debounce mode, * which means it will wait for signals to settle when reading inputs. The * argument gives the debounce time in usecs. Setting the * argument to zero turns debouncing off. * @PIN_CONFIG_INPUT_ENABLE: Enable the pin's input. Note that this does not * affect the pin's ability to drive output. 1 enables input, 0 disables * input. * @PIN_CONFIG_INPUT_SCHMITT: This will configure an input pin to run in * schmitt-trigger mode. If the schmitt-trigger has adjustable hysteresis, * the threshold value is given on a custom format as argument when * setting pins to this mode. * @PIN_CONFIG_INPUT_SCHMITT_ENABLE: Control schmitt-trigger mode on the pin. * If the argument != 0, schmitt-trigger mode is enabled. If it's 0, * schmitt-trigger mode is disabled. * @PIN_CONFIG_LOW_POWER_MODE: This will configure the pin for low power * operation, if several modes of operation are supported these can be * passed in the argument on a custom form, else just use argument 1 * to indicate low power mode, argument 0 turns low power mode off. * @PIN_CONFIG_OUTPUT_ENABLE: This will enable the pin's output mode * without driving a value there. For most platforms this reduces to * enable the output buffers and then let the pin controller current * configuration (eg. the currently selected mux function) drive values on * the line. Use argument 1 to enable output mode, argument 0 to disable * it. * @PIN_CONFIG_OUTPUT: This will configure the pin as an output and drive a * value on the line. Use argument 1 to indicate high level, argument 0 to * indicate low level. (Please see Documentation/driver-api/pinctl.rst, * section "GPIO mode pitfalls" for a discussion around this parameter.) * @PIN_CONFIG_POWER_SOURCE: If the pin can select between different power * supplies, the argument to this parameter (on a custom format) tells * the driver which alternative power source to use. * @PIN_CONFIG_SLEEP_HARDWARE_STATE: Indicate this is sleep related state. * @PIN_CONFIG_SLEW_RATE: If the pin can select slew rate, the argument to * this parameter (on a custom format) tells the driver which alternative * slew rate to use. * @PIN_CONFIG_SKEW_DELAY: If the pin has programmable skew rate (on inputs) * or latch delay (on outputs) this parameter (in a custom format) * specifies the clock skew or latch delay. It typically controls how * many double inverters are put in front of the line. * @PIN_CONFIG_END: This is the last enumerator for pin configurations, if * you need to pass in custom configurations to the pin controller, use * PIN_CONFIG_END+1 as the base offset. * @PIN_CONFIG_MAX: This is the maximum configuration value that can be * presented using the packed format. */ enum pin_config_param { PIN_CONFIG_BIAS_BUS_HOLD = 0, PIN_CONFIG_BIAS_DISABLE = 1, PIN_CONFIG_BIAS_HIGH_IMPEDANCE = 2, PIN_CONFIG_BIAS_PULL_DOWN = 3, PIN_CONFIG_BIAS_PULL_PIN_DEFAULT = 4, PIN_CONFIG_BIAS_PULL_UP = 5, PIN_CONFIG_DRIVE_OPEN_DRAIN = 6, PIN_CONFIG_DRIVE_OPEN_SOURCE = 7, PIN_CONFIG_DRIVE_PUSH_PULL = 8, PIN_CONFIG_DRIVE_STRENGTH = 9, PIN_CONFIG_DRIVE_STRENGTH_UA = 10, PIN_CONFIG_INPUT_DEBOUNCE = 11, PIN_CONFIG_INPUT_ENABLE = 12, PIN_CONFIG_INPUT_SCHMITT = 13, PIN_CONFIG_INPUT_SCHMITT_ENABLE = 14, PIN_CONFIG_LOW_POWER_MODE = 15, PIN_CONFIG_OUTPUT_ENABLE = 16, PIN_CONFIG_OUTPUT = 17, PIN_CONFIG_POWER_SOURCE = 18, PIN_CONFIG_SLEEP_HARDWARE_STATE = 19, PIN_CONFIG_SLEW_RATE = 20, PIN_CONFIG_SKEW_DELAY = 21, PIN_CONFIG_END = 127, /* 0x7F */ PIN_CONFIG_MAX = 255, /* 0xFF */ }; #if CONFIG_IS_ENABLED(PINCTRL_GENERIC) /** * pinctrl_generic_set_state() - Generic set_state operation * @pctldev: Pinctrl device to use * @config: Config device (pseudo device), pointing a config node in DTS * * Parse the DT node of @config and its children and handle generic properties * such as "pins", "groups", "functions", and pin configuration parameters. * * Return: 0 on success, or negative error code on failure */ int pinctrl_generic_set_state(struct udevice *pctldev, struct udevice *config); int pinctrl_generic_set_state_prefix(struct udevice *pctldev, struct udevice *config, const char *prefix); #else static inline int pinctrl_generic_set_state(struct udevice *pctldev, struct udevice *config) { return -ENOSYS; } #endif #if CONFIG_IS_ENABLED(PINCTRL) /** * pinctrl_select_state() - Set a device to a given state * @dev: Peripheral device * @statename: State name, like "default" * * Return: 0 on success, or negative error code on failure */ int pinctrl_select_state(struct udevice *dev, const char *statename); #else static inline int pinctrl_select_state(struct udevice *dev, const char *statename) { return -ENOSYS; } #endif /** * pinctrl_request() - Request a particular pinctrl function * @dev: Pinctrl device to use * @func: Function number (driver-specific) * @flags: Flags (driver-specific) * * Return: 0 if OK, or negative error code on failure */ int pinctrl_request(struct udevice *dev, int func, int flags); /** * pinctrl_request_noflags() - Request a particular pinctrl function * @dev: Pinctrl device to use * @func: Function number (driver-specific) * * This is similar to pinctrl_request() but uses 0 for @flags. * * Return: 0 if OK, or negative error code on failure */ int pinctrl_request_noflags(struct udevice *dev, int func); /** * pinctrl_get_periph_id() - Get the peripheral ID for a device * @dev: Pinctrl device to use for decoding * @periph: Device to check * * This generally looks at the peripheral's device tree node to work out the * peripheral ID. The return value is normally interpreted as enum periph_id. * so long as this is defined by the platform (which it should be). * * Return: Peripheral ID of @periph, or -ENOENT on error */ int pinctrl_get_periph_id(struct udevice *dev, struct udevice *periph); /** * pinctrl_get_gpio_mux() - get the mux value for a particular GPIO * @dev: Pinctrl device to use * @banknum: GPIO bank number * @index: GPIO index within the bank * * This allows the raw mux value for a GPIO to be obtained. It is * useful for displaying the function being used by that GPIO, such * as with the 'gpio' command. This function is internal to the GPIO * subsystem and should not be used by generic code. Typically it is * used by a GPIO driver with knowledge of the SoC pinctrl setup. * * Return: Mux value (SoC-specific, e.g. 0 for input, 1 for output) */ int pinctrl_get_gpio_mux(struct udevice *dev, int banknum, int index); /** * pinctrl_get_pin_muxing() - Returns the muxing description * @dev: Pinctrl device to use * @selector: Pin index within pin-controller * @buf: Pin's muxing description * @size: Pin's muxing description length * * This allows to display the muxing description of the given pin for * debug purpose * * Return: 0 if OK, or negative error code on failure */ int pinctrl_get_pin_muxing(struct udevice *dev, int selector, char *buf, int size); /** * pinctrl_get_pins_count() - Display pin-controller pins number * @dev: Pinctrl device to use * * This allows to know the number of pins owned by a given pin-controller * * Return: Number of pins if OK, or -ENOSYS when not supported */ int pinctrl_get_pins_count(struct udevice *dev); /** * pinctrl_get_pin_name() - Returns the pin's name * @dev: Pinctrl device to use * @selector: Pin index within pin-controller * @buf: Buffer to fill with the name of the pin * @size: Size of @buf * * This allows to display the pin's name for debug purpose * * Return: 0 if OK, or negative error code on failure */ int pinctrl_get_pin_name(struct udevice *dev, int selector, char *buf, int size); /** * pinctrl_gpio_request() - Request a single pin to be used as GPIO * @dev: GPIO peripheral device * @offset: GPIO pin offset from the GPIO controller * @label: GPIO label * * Return: 0 on success, or negative error code on failure */ int pinctrl_gpio_request(struct udevice *dev, unsigned offset, const char *label); /** * pinctrl_gpio_free() - Free a single pin used as GPIO * @dev: GPIO peripheral device * @offset: GPIO pin offset from the GPIO controller * * Return: 0 on success, or negative error code on failure */ int pinctrl_gpio_free(struct udevice *dev, unsigned offset); #endif /* __PINCTRL_H */