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- /* SPDX-License-Identifier: GPL-2.0+ */
- /*
- * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
- */
- #ifndef __PINCTRL_H
- #define __PINCTRL_H
- #define PINNAME_SIZE 10
- #define PINMUX_SIZE 40
- /**
- * 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.
- *
- * The @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.
- *
- * @get_pins_count: return number of selectable named pins available
- * in this driver. (necessary to parse "pins" property in DTS)
- * @get_pin_name: return the pin name of the pin selector,
- * called by the core to figure out which pin it shall do
- * operations to. (necessary to parse "pins" property in DTS)
- * @get_groups_count: return number of selectable named groups available
- * in this driver. (necessary to parse "groups" property in DTS)
- * @get_group_name: return the group name of the group selector,
- * called by the core to figure out which pin group it shall do
- * operations to. (necessary to parse "groups" property in DTS)
- * @get_functions_count: return number of selectable named functions available
- * in this driver. (necessary for pin-muxing)
- * @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. (necessary for pin-muxing)
- * @pinmux_set: enable a certain muxing function with a certain pin.
- * The @func_selector selects a certain function whereas @pin_selector
- * selects a certain pin to be used. On simple controllers one of them
- * may be ignored. (necessary for pin-muxing against a single pin)
- * @pinmux_group_set: enable a certain muxing function with a certain pin
- * group. The @func_selector selects a certain function whereas
- * @group_selector selects a certain set of pins to be used. On simple
- * controllers one of them may be ignored.
- * (necessary for pin-muxing against a pin group)
- * @pinconf_num_params: number of driver-specific parameters to be parsed
- * from device trees (necessary for pin-configuration)
- * @pinconf_params: list of driver_specific parameters to be parsed from
- * device trees (necessary for pin-configuration)
- * @pinconf_set: configure an individual pin with a given parameter.
- * (necessary for pin-configuration against a single pin)
- * @pinconf_group_set: configure all pins in a group with a given parameter.
- * (necessary for pin-configuration against a pin group)
- * @set_state: do pinctrl operations specified by @config, a pseudo device
- * pointing a config node. (necessary for pinctrl_full)
- * @set_state_simple: do needed pinctrl operations for a peripherl @periph.
- * (necessary for pinctrl_simple)
- * @get_pin_muxing: display the muxing of a given pin.
- * @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
- */
- struct pinctrl_ops {
- int (*get_pins_count)(struct udevice *dev);
- const char *(*get_pin_name)(struct udevice *dev, unsigned selector);
- int (*get_groups_count)(struct udevice *dev);
- const char *(*get_group_name)(struct udevice *dev, unsigned selector);
- int (*get_functions_count)(struct udevice *dev);
- const char *(*get_function_name)(struct udevice *dev,
- unsigned selector);
- int (*pinmux_set)(struct udevice *dev, unsigned pin_selector,
- unsigned func_selector);
- int (*pinmux_group_set)(struct udevice *dev, unsigned group_selector,
- unsigned func_selector);
- unsigned int pinconf_num_params;
- const struct pinconf_param *pinconf_params;
- int (*pinconf_set)(struct udevice *dev, unsigned pin_selector,
- unsigned param, unsigned argument);
- int (*pinconf_group_set)(struct udevice *dev, unsigned group_selector,
- unsigned param, unsigned argument);
- int (*set_state)(struct udevice *dev, struct udevice *config);
- /* for pinctrl-simple */
- int (*set_state_simple)(struct udevice *dev, struct udevice *periph);
- /**
- * request() - Request a particular pinctrl function
- *
- * This activates the selected function.
- *
- * @dev: Device to adjust (UCLASS_PINCTRL)
- * @func: Function number (driver-specific)
- * @return 0 if OK, -ve on error
- */
- int (*request)(struct udevice *dev, int func, int flags);
- /**
- * get_periph_id() - get the peripheral ID for a device
- *
- * 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).
- *
- * @dev: Pinctrl device to use for decoding
- * @periph: Device to check
- * @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
- *
- * 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.
- *
- * @dev: Pinctrl device to use
- * @banknum: GPIO bank number
- * @index: GPIO index within the bank
- * @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
- *
- * This allows to display the muxing of a given pin. It's useful for
- * debug purpose 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.
- *
- * @dev: Pinctrl device to use
- * @selector: Pin selector
- * @buf Pin's muxing description
- * @size Pin's muxing description length
- * return 0 if OK, -ve on error
- */
- int (*get_pin_muxing)(struct udevice *dev, unsigned int selector,
- char *buf, int size);
- /**
- * gpio_request_enable: requests and enables GPIO on a certain pin.
- *
- * @dev: Pinctrl device to use
- * @selector: Pin selector
- * return 0 if OK, -ve on error
- */
- 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
- * return 0 if OK, -ve on error
- */
- int (*gpio_disable_free)(struct udevice *dev, unsigned int selector);
- };
- #define pinctrl_get_ops(dev) ((struct pinctrl_ops *)(dev)->driver->ops)
- /**
- * Generic pin configuration paramters
- *
- * enum pin_config_param - possible 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,
- PIN_CONFIG_BIAS_DISABLE,
- PIN_CONFIG_BIAS_HIGH_IMPEDANCE,
- PIN_CONFIG_BIAS_PULL_DOWN,
- PIN_CONFIG_BIAS_PULL_PIN_DEFAULT,
- PIN_CONFIG_BIAS_PULL_UP,
- PIN_CONFIG_DRIVE_OPEN_DRAIN,
- PIN_CONFIG_DRIVE_OPEN_SOURCE,
- PIN_CONFIG_DRIVE_PUSH_PULL,
- PIN_CONFIG_DRIVE_STRENGTH,
- PIN_CONFIG_DRIVE_STRENGTH_UA,
- PIN_CONFIG_INPUT_DEBOUNCE,
- PIN_CONFIG_INPUT_ENABLE,
- PIN_CONFIG_INPUT_SCHMITT,
- PIN_CONFIG_INPUT_SCHMITT_ENABLE,
- PIN_CONFIG_LOW_POWER_MODE,
- PIN_CONFIG_OUTPUT_ENABLE,
- PIN_CONFIG_OUTPUT,
- PIN_CONFIG_POWER_SOURCE,
- PIN_CONFIG_SLEEP_HARDWARE_STATE,
- PIN_CONFIG_SLEW_RATE,
- PIN_CONFIG_SKEW_DELAY,
- PIN_CONFIG_END = 0x7F,
- PIN_CONFIG_MAX = 0xFF,
- };
- #if CONFIG_IS_ENABLED(PINCTRL_GENERIC)
- /**
- * pinctrl_generic_set_state() - generic set_state operation
- * Parse the DT node of @config and its children and handle generic properties
- * such as "pins", "groups", "functions", and pin configuration parameters.
- *
- * @pctldev: pinctrl device
- * @config: config device (pseudo device), pointing a config node in DTS
- * @return: 0 on success, or negative error code on failure
- */
- int pinctrl_generic_set_state(struct udevice *pctldev, struct udevice *config);
- #else
- static inline int pinctrl_generic_set_state(struct udevice *pctldev,
- struct udevice *config)
- {
- return -EINVAL;
- }
- #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 -EINVAL;
- }
- #endif
- /**
- * pinctrl_request() - Request a particular pinctrl function
- *
- * @dev: Device to check (UCLASS_PINCTRL)
- * @func: Function number (driver-specific)
- * @flags: Flags (driver-specific)
- * @return 0 if OK, -ve on error
- */
- int pinctrl_request(struct udevice *dev, int func, int flags);
- /**
- * pinctrl_request_noflags() - Request a particular pinctrl function
- *
- * This is similar to pinctrl_request() but uses 0 for @flags.
- *
- * @dev: Device to check (UCLASS_PINCTRL)
- * @func: Function number (driver-specific)
- * @return 0 if OK, -ve on error
- */
- int pinctrl_request_noflags(struct udevice *dev, int func);
- /**
- * pinctrl_get_periph_id() - get the peripheral ID for a device
- *
- * 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).
- *
- * @dev: Pinctrl device to use for decoding
- * @periph: Device to check
- * @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
- *
- * 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.
- *
- * @dev: Pinctrl device to use
- * @banknum: GPIO bank number
- * @index: GPIO index within the bank
- * @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
- *
- * This allows to display the muxing description of the given pin for
- * debug purpose
- *
- * @dev: Pinctrl device to use
- * @selector Pin index within pin-controller
- * @buf Pin's muxing description
- * @size Pin's muxing description length
- * @return 0 if OK, -ve on error
- */
- int pinctrl_get_pin_muxing(struct udevice *dev, int selector, char *buf,
- int size);
- /**
- * pinctrl_get_pins_count() - display pin-controller pins number
- *
- * This allows to know the number of pins owned by a given pin-controller
- *
- * @dev: Pinctrl device to use
- * @return pins number if OK, -ve on error
- */
- int pinctrl_get_pins_count(struct udevice *dev);
- /**
- * pinctrl_get_pin_name() - Returns the pin's name
- *
- * This allows to display the pin's name for debug purpose
- *
- * @dev: Pinctrl device to use
- * @selector Pin index within pin-controller
- * @buf Pin's name
- * @return 0 if OK, -ve on error
- */
- 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: the GPIO pin offset from the GPIO controller
- * @return: 0 on success, or negative error code on failure
- */
- int pinctrl_gpio_request(struct udevice *dev, unsigned offset);
- /**
- * pinctrl_gpio_free() - free a single pin used as GPIO
- *
- * @dev: GPIO peripheral device
- * @offset: the 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 */
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