From: Sean Anderson Date: Mon, 14 Sep 2020 15:01:56 +0000 (-0400) Subject: pinctrl: Reformat documentation in dm/pinctrl.h X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=5eee93e5b1ae9b2b31db99f774e0f635ad276068;p=u-boot.git pinctrl: Reformat documentation in dm/pinctrl.h This normalizes the documentation to conform to kernel-doc style [1]. It also moves the documentation for pinctrl_ops inline, and adds argument and return-value documentation. I have kept the usual function style for these comments. I could not find any existing examples of function documentation inside structs. [1] https://www.kernel.org/doc/html/latest/doc-guide/kernel-doc.html Signed-off-by: Sean Anderson Reviewed-by: Simon Glass --- diff --git a/doc/api/index.rst b/doc/api/index.rst index b7eb5725f2..1c261bcb73 100644 --- a/doc/api/index.rst +++ b/doc/api/index.rst @@ -9,6 +9,7 @@ U-Boot API documentation dfu efi linker_lists + pinctrl rng serial unicode diff --git a/doc/api/pinctrl.rst b/doc/api/pinctrl.rst new file mode 100644 index 0000000000..043bd57efa --- /dev/null +++ b/doc/api/pinctrl.rst @@ -0,0 +1,7 @@ +.. SPDX-License-Identifier: GPL-2.0+ + +Pinctrl and Pinmux +================== + +.. kernel-doc:: include/dm/pinctrl.h + :internal: diff --git a/include/dm/pinctrl.h b/include/dm/pinctrl.h index d50af1ce38..1bdc8d3cbd 100644 --- a/include/dm/pinctrl.h +++ b/include/dm/pinctrl.h @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: GPL-2.0+ */ /* - * Copyright (C) 2015 Masahiro Yamada + * Copyright (C) 2015 Masahiro Yamada */ #ifndef __PINCTRL_H @@ -11,11 +11,10 @@ /** * 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 + * @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; @@ -27,111 +26,274 @@ struct pinconf_param { * 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 + * 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) - * @pinmux_property_set: enable a pinmux group. @pinmux_group should specify the - * pin identifier and mux settings. The exact format of a pinmux group is - * left up to the driver. The pin selector for the mux-ed pin should be - * returned on success. (necessary to parse the "pinmux" property in DTS) - * @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 { + /** + * @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); - /* for pinctrl-simple */ + /** + * @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 + * @request: Request a particular pinctrl function + * + * @dev: Device to adjust (%UCLASS_PINCTRL) + * + * @func: Function number (driver-specific) * * This activates the selected function. * - * @dev: Device to adjust (UCLASS_PINCTRL) - * @func: Function number (driver-specific) - * @return 0 if OK, -ve on error + * @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 + * @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 + * &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 + * @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 + * @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 @@ -139,46 +301,60 @@ struct pinctrl_ops { * 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) + * @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 + * @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 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 + * 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: requests and enables GPIO on a certain pin. + * @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. * - * @dev: Pinctrl device to use - * @selector: Pin selector - * return 0 if OK, -ve on error + * @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. + * @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 + * @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); }; @@ -186,27 +362,26 @@ struct pinctrl_ops { #define pinctrl_get_ops(dev) ((struct pinctrl_ops *)(dev)->driver->ops) /** - * Generic pin configuration paramters + * enum pin_config_param - Generic pin configuration parameters * - * enum pin_config_param - possible pin configuration parameters - * @PIN_CONFIG_BIAS_BUS_HOLD: the pin will be set to weakly latch so that it + * @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 + * @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 + * @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 + * @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 + * @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 @@ -214,67 +389,67 @@ struct pinctrl_ops { * 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 + * @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 + * @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 + * @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 + * @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 + * @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, + * @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 + * @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 + * @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. + * @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 + * @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 + * @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 + * @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 + * @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 + * @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) + * @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 + * @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 + * @PIN_CONFIG_MAX: This is the maximum configuration value that can be * presented using the packed format. */ enum pin_config_param { @@ -306,13 +481,14 @@ enum pin_config_param { #if CONFIG_IS_ENABLED(PINCTRL_GENERIC) /** - * pinctrl_generic_set_state() - generic set_state operation + * 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. * - * @pctldev: pinctrl device - * @config: config device (pseudo device), pointing a config node in DTS - * @return: 0 on success, or negative error code on failure + * Return: 0 on success, or negative error code on failure */ int pinctrl_generic_set_state(struct udevice *pctldev, struct udevice *config); #else @@ -325,11 +501,11 @@ static inline int pinctrl_generic_set_state(struct udevice *pctldev, #if CONFIG_IS_ENABLED(PINCTRL) /** - * pinctrl_select_state() - set a device to a given state + * pinctrl_select_state() - Set a device to a given state + * @dev: Peripheral device + * @statename: State name, like "default" * - * @dev: peripheral device - * @statename: state name, like "default" - * @return: 0 on success, or negative error code on failure + * Return: 0 on success, or negative error code on failure */ int pinctrl_select_state(struct udevice *dev, const char *statename); #else @@ -342,40 +518,43 @@ static inline int pinctrl_select_state(struct udevice *dev, /** * pinctrl_request() - Request a particular pinctrl function - * - * @dev: Device to check (UCLASS_PINCTRL) + * @dev: Pinctrl device to use * @func: Function number (driver-specific) * @flags: Flags (driver-specific) - * @return 0 if OK, -ve on error + * + * 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. * - * @dev: Device to check (UCLASS_PINCTRL) - * @func: Function number (driver-specific) - * @return 0 if OK, -ve on error + * 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 + * 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). * - * @dev: Pinctrl device to use for decoding - * @periph: Device to check - * @return peripheral ID of @periph, or -ENOENT on error + * 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 @@ -383,66 +562,64 @@ int pinctrl_get_periph_id(struct udevice *dev, struct udevice *periph); * 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) + * 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 * - * @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 + * 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 + * 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 * - * @dev: Pinctrl device to use - * @return pins number if OK, -ve on error + * Return: Number of pins if OK, or negative error code on failure */ 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 * - * @dev: Pinctrl device to use - * @selector Pin index within pin-controller - * @buf Pin's name - * @return 0 if OK, -ve on error + * 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 + * pinctrl_gpio_request() - Request a single pin to be used as GPIO + * @dev: GPIO peripheral device + * @offset: GPIO pin offset from the GPIO controller * - * @dev: GPIO peripheral device - * @offset: the GPIO pin offset from the GPIO controller - * @return: 0 on success, or negative error code on failure + * 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 + * pinctrl_gpio_free() - Free a single pin used as GPIO + * @dev: GPIO peripheral device + * @offset: GPIO pin offset from the GPIO controller * - * @dev: GPIO peripheral device - * @offset: the GPIO pin offset from the GPIO controller - * @return: 0 on success, or negative error code on failure + * Return: 0 on success, or negative error code on failure */ int pinctrl_gpio_free(struct udevice *dev, unsigned offset);