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Diffstat (limited to 'include/dm/pinctrl.h')
| -rw-r--r-- | include/dm/pinctrl.h | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/include/dm/pinctrl.h b/include/dm/pinctrl.h new file mode 100644 index 0000000000..bc6fdb4a1f --- /dev/null +++ b/include/dm/pinctrl.h @@ -0,0 +1,227 @@ +/* + * 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 */ |