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Immutable branch betweeb the GPIO and I2C trees for v7.2-rc1

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- add the gpiod_is_single_ended() helper function
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Merge tag 'ib-gpio-add-gpiod-is-single-ended-for-v7.2' into i2c/i2c-host

Immutable branch between the GPIO and I2C trees for v7.2-rc1

- add the gpiod_is_single_ended() helper function
This commit is contained in:
Andi Shyti 2026-06-05 10:46:58 +02:00
commit afd9ada24b
2 changed files with 27 additions and 0 deletions
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22
drivers/gpio/gpiolib.c
View File

@ -491,6 +491,28 @@ int gpiod_get_direction(struct gpio_desc *desc)
}
EXPORT_SYMBOL_GPL(gpiod_get_direction);
/**
* gpiod_is_single_ended - check if the GPIO is configured as single-ended
* @desc: the GPIO descriptor to check
*
* Returns true if the GPIO is configured as either Open Drain or Open Source.
* In these modes, the direction of the line cannot always be reliably
* determined by reading hardware registers, as the "off" state (High-Z)
* is physically indistinguishable from an input state.
*/
bool gpiod_is_single_ended(struct gpio_desc *desc)
{
if (!desc)
return false;
if (test_bit(GPIOD_FLAG_OPEN_DRAIN, &desc->flags) ||
test_bit(GPIOD_FLAG_OPEN_SOURCE, &desc->flags))
return true;
return false;
}
EXPORT_SYMBOL_GPL(gpiod_is_single_ended);
/*
* Add a new chip to the global chips list, keeping the list of chips sorted
* by range(means [base, base + ngpio - 1]) order.

5
include/linux/gpio/consumer.h
View File

@ -111,6 +111,7 @@ void devm_gpiod_unhinge(struct device *dev, struct gpio_desc *desc);
void devm_gpiod_put_array(struct device *dev, struct gpio_descs *descs);
int gpiod_get_direction(struct gpio_desc *desc);
bool gpiod_is_single_ended(struct gpio_desc *desc);
int gpiod_direction_input(struct gpio_desc *desc);
int gpiod_direction_output(struct gpio_desc *desc, int value);
int gpiod_direction_output_raw(struct gpio_desc *desc, int value);
@ -337,6 +338,10 @@ static inline int gpiod_get_direction(const struct gpio_desc *desc)
WARN_ON(desc);
return -ENOSYS;
}
static inline bool gpiod_is_single_ended(struct gpio_desc *desc)
{
return false;
}
static inline int gpiod_direction_input(struct gpio_desc *desc)
{
/* GPIO can never have been requested */