X-Git-Url: http://git.monstr.eu/?a=blobdiff_plain;f=drivers%2Fpinctrl%2Fcore.c;h=2bbd8ee935075b7a419851bad3767efb4475d05d;hb=3b805ca177a24ff78b466ca73febe8466c67ea61;hp=b70df27874d1ddedfb2f16dd43d2721c8a65d772;hpb=6f50fa2a6f1395ad5f59ce7b87730f1f3ea19d76;p=linux-2.6-microblaze.git

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