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drivers: gpio: Add a managed API to get a GPIO from the device-tree

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Add managed functions to get a gpio from the devce-tree, based on a
property name (minus the '-gpios' suffix) and optionally an index.

When the device is unbound, the GPIO is automatically released and the
data structure is freed.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
This commit is contained in:
Jean-Jacques Hiblot
2020-09-11 13:43:34 +05:30
committed by Tom Rini
parent bad2433151
commit d4b722e3a8
2 changed files with 118 additions and 0 deletions
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47
include/asm-generic/gpio.h
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@@ -701,4 +701,51 @@ int gpio_get_number(const struct gpio_desc *desc);
*/
int gpio_get_acpi(const struct gpio_desc *desc, struct acpi_gpio *gpio);
/**
* devm_gpiod_get_index - Resource-managed gpiod_get()
* @dev: GPIO consumer
* @con_id: function within the GPIO consumer
* @index: index of the GPIO to obtain in the consumer
* @flags: optional GPIO initialization flags
*
* Managed gpiod_get(). GPIO descriptors returned from this function are
* automatically disposed on device unbind.
* Return the GPIO descriptor corresponding to the function con_id of device
* dev, -ENOENT if no GPIO has been assigned to the requested function, or
* another IS_ERR() code if an error occurred while trying to acquire the GPIO.
*/
struct gpio_desc *devm_gpiod_get_index(struct udevice *dev, const char *id,
unsigned int index, int flags);
#define devm_gpiod_get(dev, id, flags) devm_gpiod_get_index(dev, id, 0, flags)
/**
* gpiod_get_optional - obtain an optional GPIO for a given GPIO function
* @dev: GPIO consumer, can be NULL for system-global GPIOs
* @con_id: function within the GPIO consumer
* @index: index of the GPIO to obtain in the consumer
* @flags: optional GPIO initialization flags
*
* This is equivalent to devm_gpiod_get(), except that when no GPIO was
* assigned to the requested function it will return NULL. This is convenient
* for drivers that need to handle optional GPIOs.
*/
struct gpio_desc *devm_gpiod_get_index_optional(struct udevice *dev,
const char *id,
unsigned int index,
int flags);
#define devm_gpiod_get_optional(dev, id, flags) \
devm_gpiod_get_index_optional(dev, id, 0, flags)
/**
* devm_gpiod_put - Resource-managed gpiod_put()
* @dev: GPIO consumer
* @desc: GPIO descriptor to dispose of
*
* Dispose of a GPIO descriptor obtained with devm_gpiod_get() or
* devm_gpiod_get_index(). Normally this function will not be called as the GPIO
* will be disposed of by the resource management code.
*/
void devm_gpiod_put(struct udevice *dev, struct gpio_desc *desc);
#endif /* _ASM_GENERIC_GPIO_H_ */