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/*
* Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __PINCTRL_H
#define __PINCTRL_H
/**
* 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)
*/
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);
int (*set_state_simple)(struct udevice *dev, struct udevice *periph);
};
#define pinctrl_get_ops(dev) ((struct pinctrl_ops *)(dev)->driver->ops)
/**
* Generic pin configuration paramters
*
* @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_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_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_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_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_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_STRENGTH: the pin will sink or source at most the current
* passed as argument. The argument is in mA.
* @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_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_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_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_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_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_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: this will configure the pin as an output. Use argument
* 1 to indicate high level, argument 0 to indicate low level. (Please
* see Documentation/pinctrl.txt, section "GPIO mode pitfalls" for a
* discussion around this parameter.)
* @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.
*/
#define PIN_CONFIG_BIAS_DISABLE 0
#define PIN_CONFIG_BIAS_HIGH_IMPEDANCE 1
#define PIN_CONFIG_BIAS_BUS_HOLD 2
#define PIN_CONFIG_BIAS_PULL_UP 3
#define PIN_CONFIG_BIAS_PULL_DOWN 4
#define PIN_CONFIG_BIAS_PULL_PIN_DEFAULT 5
#define PIN_CONFIG_DRIVE_PUSH_PULL 6
#define PIN_CONFIG_DRIVE_OPEN_DRAIN 7
#define PIN_CONFIG_DRIVE_OPEN_SOURCE 8
#define PIN_CONFIG_DRIVE_STRENGTH 9
#define PIN_CONFIG_INPUT_ENABLE 10
#define PIN_CONFIG_INPUT_SCHMITT_ENABLE 11
#define PIN_CONFIG_INPUT_SCHMITT 12
#define PIN_CONFIG_INPUT_DEBOUNCE 13
#define PIN_CONFIG_POWER_SOURCE 14
#define PIN_CONFIG_SLEW_RATE 15
#define PIN_CONFIG_LOW_POWER_MODE 16
#define PIN_CONFIG_OUTPUT 17
#define PIN_CONFIG_END 0x7FFF
#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
#endif /* __PINCTRL_H */
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