pwm: Make pwm_request_from_chip() private to the core

The last user of this function outside of core.c is gone, so it can be
made static.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Link: https://lore.kernel.org/r/20240607084416.897777-8-u.kleine-koenig@baylibre.com
Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>

Author: Uwe Kleine-König

drivers/pwm/core.c

@@ -396,9 +396,9 @@ static int pwm_device_request(struct pwm_device *pwm, const char *label)
  * chip. A negative error code is returned if the index is not valid for the
  * specified PWM chip or if the PWM device cannot be requested.
  */
-struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
-					 unsigned int index,
-					 const char *label)
+static struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
+						unsigned int index,
+						const char *label)
 {
 	struct pwm_device *pwm;
 	int err;
@@ -416,8 +416,6 @@ struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
 	mutex_unlock(&pwm_lock);
 	return pwm;
 }
-EXPORT_SYMBOL_GPL(pwm_request_from_chip);
-
 
 struct pwm_device *
 of_pwm_xlate_with_flags(struct pwm_chip *chip, const struct of_phandle_args *args)

include/linux/pwm.h

@@ -410,10 +410,6 @@ void pwmchip_remove(struct pwm_chip *chip);
 int __devm_pwmchip_add(struct device *dev, struct pwm_chip *chip, struct module *owner);
 #define devm_pwmchip_add(dev, chip) __devm_pwmchip_add(dev, chip, THIS_MODULE)
 
-struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
-					 unsigned int index,
-					 const char *label);
-
 struct pwm_device *of_pwm_xlate_with_flags(struct pwm_chip *chip,
 		const struct of_phandle_args *args);
 struct pwm_device *of_pwm_single_xlate(struct pwm_chip *chip,
@@ -508,14 +504,6 @@ static inline int devm_pwmchip_add(struct device *dev, struct pwm_chip *chip)
 	return -EINVAL;
 }
 
-static inline struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
-						       unsigned int index,
-						       const char *label)
-{
-	might_sleep();
-	return ERR_PTR(-ENODEV);
-}
-
 static inline struct pwm_device *pwm_get(struct device *dev,
 					 const char *consumer)
 {