pinctrl: remove unused pin_is_valid()

This function was used by pin_request() to pointlessly double-check
the pin validity, and it was the only user ever.

Since commit d2f6a1c6 ("pinctrl: remove double pin validity
check."), no one has ever used it.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/core.c

@@ -178,29 +178,6 @@ const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned pin)
 	return desc->name;
 }
 
-/**
- * pin_is_valid() - check if pin exists on controller
- * @pctldev: the pin control device to check the pin on
- * @pin: pin to check, use the local pin controller index number
- *
- * This tells us whether a certain pin exist on a certain pin controller or
- * not. Pin lists may be sparse, so some pins may not exist.
- */
-bool pin_is_valid(struct pinctrl_dev *pctldev, int pin)
-{
-	struct pin_desc *pindesc;
-
-	if (pin < 0)
-		return false;
-
-	mutex_lock(&pctldev->mutex);
-	pindesc = pin_desc_get(pctldev, pin);
-	mutex_unlock(&pctldev->mutex);
-
-	return pindesc != NULL;
-}
-EXPORT_SYMBOL_GPL(pin_is_valid);
-
 /* Deletes a range of pin descriptors */
 static void pinctrl_free_pindescs(struct pinctrl_dev *pctldev,
 				  const struct pinctrl_pin_desc *pins,

include/linux/pinctrl/pinctrl.h

@@ -172,7 +172,6 @@ extern struct pinctrl_dev *devm_pinctrl_register(struct device *dev,
 extern void devm_pinctrl_unregister(struct device *dev,
 				struct pinctrl_dev *pctldev);
 
-extern bool pin_is_valid(struct pinctrl_dev *pctldev, int pin);
 extern void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev,
 				struct pinctrl_gpio_range *range);
 extern void pinctrl_add_gpio_ranges(struct pinctrl_dev *pctldev,
@@ -203,15 +202,6 @@ struct pinctrl_dev *of_pinctrl_get(struct device_node *np)
 extern const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev);
 extern const char *pinctrl_dev_get_devname(struct pinctrl_dev *pctldev);
 extern void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev);
-#else
-
-struct pinctrl_dev;
-
-/* Sufficiently stupid default functions when pinctrl is not in use */
-static inline bool pin_is_valid(struct pinctrl_dev *pctldev, int pin)
-{
-	return pin >= 0;
-}
 
 #endif /* !CONFIG_PINCTRL */