diff options
Diffstat (limited to 'drivers/pinctrl/core.c')
| -rw-r--r-- | drivers/pinctrl/core.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c index b70df27874d1..2bbd8ee93507 100644 --- a/drivers/pinctrl/core.c +++ b/drivers/pinctrl/core.c @@ -736,6 +736,34 @@ int pinctrl_get_group_selector(struct pinctrl_dev *pctldev, return -EINVAL; } +bool pinctrl_gpio_can_use_line(unsigned gpio) +{ + struct pinctrl_dev *pctldev; + struct pinctrl_gpio_range *range; + bool result; + int pin; + + /* + * Try to obtain GPIO range, if it fails + * we're probably dealing with GPIO driver + * without a backing pin controller - bail out. + */ + if (pinctrl_get_device_gpio_range(gpio, &pctldev, &range)) + return true; + + mutex_lock(&pctldev->mutex); + + /* Convert to the pin controllers number space */ + pin = gpio_to_pin(range, gpio); + + result = pinmux_can_be_used_for_gpio(pctldev, pin); + + mutex_unlock(&pctldev->mutex); + + return result; +} +EXPORT_SYMBOL_GPL(pinctrl_gpio_can_use_line); + /** * pinctrl_gpio_request() - request a single pin to be used as GPIO * @gpio: the GPIO pin number from the GPIO subsystem number space |