Add submodule dependency filesHEADmaster

Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec

1 files changed, 626 insertions, 0 deletions

diff --git a/roms/u-boot/include/dm/pinctrl.h b/roms/u-boot/include/dm/pinctrl.h
new file mode 100644
index 000000000..1bdc8d3cb
--- /dev/null
+++ b/roms/u-boot/include/dm/pinctrl.h
@@ -0,0 +1,626 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2015  Masahiro Yamada <yamada.masahiro@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.
+ *
+ * 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,
+	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
+ * @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);
+#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:	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 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
+ *
+ * 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
+ *
+ * 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:	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 */