MFD AXP192 interface

Functions
int	mfd_axp192_gpio_func_ctrl (const struct device *dev, const struct device *client_dev, uint8_t gpio, enum axp192_gpio_func func)
	Request a GPIO pin to be configured to a specific function.
int	mfd_axp192_gpio_func_get (const struct device *dev, uint8_t gpio, enum axp192_gpio_func *func)
	Read out current configuration of a specific GPIO pin.
int	mfd_axp192_gpio_pd_ctrl (const struct device *dev, uint8_t gpio, bool enable)
	Enable pull-down on specified GPIO pin.
int	mfd_axp192_gpio_pd_get (const struct device *dev, uint8_t gpio, bool *enabled)
	Read out the current pull-down configuration of a specific GPIO.
int	mfd_axp192_gpio_read_port (const struct device *dev, uint8_t *value)
	Read GPIO port.
int	mfd_axp192_gpio_write_port (const struct device *dev, uint8_t value, uint8_t mask)
	Write GPIO port.

Detailed Description

Pins of AXP192 support several different functions. The mfd interface offers an API to configure and control these different functions.

The 6 GPIOS are mapped as follows:

Function Documentation

mfd_axp192_gpio_func_ctrl()

int mfd_axp192_gpio_func_ctrl	(	const struct device *	dev,
		const struct device *	client_dev,
		uint8_t	gpio,
		enum axp192_gpio_func	func )

#include <zephyr/drivers/mfd/axp192.h>

Request a GPIO pin to be configured to a specific function.

GPIO0..5 of AXP192 feature various functions (see axp192_gpio_func for details). A GPIO can only be used by one driver instance. Subsequential calls on the same GPIO will overwrite according function.

Parameters

dev	axp192 mfd device
client_dev	client device the gpio is used in
gpio	GPIO to be configured (0..5)
func	Function to be configured (see axp192_gpio_func for details)

Return values

0	on success
-EINVAL	if an invalid GPIO number is passed
-ENOTSUP	if the requested function is not supported by the given
-errno	in case of any bus error

mfd_axp192_gpio_func_get()

int mfd_axp192_gpio_func_get	(	const struct device *	dev,
		uint8_t	gpio,
		enum axp192_gpio_func *	func )

#include <zephyr/drivers/mfd/axp192.h>

Read out current configuration of a specific GPIO pin.

Parameters

dev	axp192 mfd device
gpio	GPIO to read configuration from
func	Pointer to store current function configuration in.

Returns

0 on success

Return values

-EINVAL	if an invalid GPIO number is passed
-errno	in case of any bus error

mfd_axp192_gpio_pd_ctrl()

int mfd_axp192_gpio_pd_ctrl	(	const struct device *	dev,
		uint8_t	gpio,
		bool	enable )

#include <zephyr/drivers/mfd/axp192.h>

Enable pull-down on specified GPIO pin.

AXP192 only supports pull-down on GPIO3..5. Pull-ups are not supported.

Parameters

dev	axp192 mfd device
gpio	GPIO to control pull-downs
enable	true to enable, false to disable pull-down

Return values

0	on success
-EINVAL	if an invalid argument is given (e.g. invalid GPIO number)
-ENOTSUP	if pull-down is not supported by the givenn GPIO
-errno	in case of any bus error

mfd_axp192_gpio_pd_get()

int mfd_axp192_gpio_pd_get	(	const struct device *	dev,
		uint8_t	gpio,
		bool *	enabled )

#include <zephyr/drivers/mfd/axp192.h>

Read out the current pull-down configuration of a specific GPIO.

Parameters

dev	axp192 mfd device
gpio	GPIO to control pull-downs
enabled	Pointer to current pull-down configuration (true: pull-down enabled/ false: pull-down disabled)

Return values

-EINVAL	if an invalid argument is given (e.g. invalid GPIO number)
-ENOTSUP	if pull-down is not supported by the givenn GPIO
-errno	in case of any bus error

mfd_axp192_gpio_read_port()

int mfd_axp192_gpio_read_port	(	const struct device *	dev,
		uint8_t *	value )

#include <zephyr/drivers/mfd/axp192.h>

Read GPIO port.

Parameters

dev	axp192 mfd device
value	Pointer to port value

Return values

0	on success
-errno	in case of any bus error

mfd_axp192_gpio_write_port()

int mfd_axp192_gpio_write_port	(	const struct device *	dev,
		uint8_t	value,
		uint8_t	mask )

#include <zephyr/drivers/mfd/axp192.h>

Write GPIO port.

Parameters

dev	axp192 mfd device
value	port value
mask	pin mask within the port

Return values

0	on success
-errno	in case of any bus error