pwm: Drop pwm_[sg]et_chip_data()

The semantic of chip_data is a bit surprising as it's cleared when
pwm_put() is called. Also there is a big overlap with the standard driver
data.

All drivers were adapted to not make use of chip_data any more, so it can
go away.

Link: https://lore.kernel.org/r/20230705080650.2353391-9-u.kleine-koenig@pengutronix.deSigned-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/core.c

@@ -208,36 +208,6 @@ static void of_pwmchip_remove(struct pwm_chip *chip)
 		of_node_put(chip->dev->of_node);
 }
 
-/**
- * pwm_set_chip_data() - set private chip data for a PWM
- * @pwm: PWM device
- * @data: pointer to chip-specific data
- *
- * Returns: 0 on success or a negative error code on failure.
- */
-int pwm_set_chip_data(struct pwm_device *pwm, void *data)
-{
-	if (!pwm)
-		return -EINVAL;
-
-	pwm->chip_data = data;
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(pwm_set_chip_data);
-
-/**
- * pwm_get_chip_data() - get private chip data for a PWM
- * @pwm: PWM device
- *
- * Returns: A pointer to the chip-private data for the PWM device.
- */
-void *pwm_get_chip_data(struct pwm_device *pwm)
-{
-	return pwm ? pwm->chip_data : NULL;
-}
-EXPORT_SYMBOL_GPL(pwm_get_chip_data);
-
 static bool pwm_ops_check(const struct pwm_chip *chip)
 {
 	const struct pwm_ops *ops = chip->ops;
@@ -980,7 +950,6 @@ void pwm_put(struct pwm_device *pwm)
 	if (pwm->chip->ops->free)
 		pwm->chip->ops->free(pwm->chip, pwm);
 
-	pwm_set_chip_data(pwm, NULL);
 	pwm->label = NULL;
 
 	module_put(pwm->chip->owner);

include/linux/pwm.h

@@ -71,7 +71,6 @@ struct pwm_state {
  * @hwpwm: per-chip relative index of the PWM device
  * @pwm: global index of the PWM device
  * @chip: PWM chip providing this PWM device
- * @chip_data: chip-private data associated with the PWM device
  * @args: PWM arguments
  * @state: last applied state
  * @last: last implemented state (for PWM_DEBUG)
@@ -82,7 +81,6 @@ struct pwm_device {
 	unsigned int hwpwm;
 	unsigned int pwm;
 	struct pwm_chip *chip;
-	void *chip_data;
 
 	struct pwm_args args;
 	struct pwm_state state;
@@ -383,8 +381,6 @@ static inline void pwm_disable(struct pwm_device *pwm)
 /* PWM provider APIs */
 int pwm_capture(struct pwm_device *pwm, struct pwm_capture *result,
 		unsigned long timeout);
-int pwm_set_chip_data(struct pwm_device *pwm, void *data);
-void *pwm_get_chip_data(struct pwm_device *pwm);
 
 int __pwmchip_add(struct pwm_chip *chip, struct module *owner);
 #define pwmchip_add(chip) __pwmchip_add(chip, THIS_MODULE)
@@ -447,16 +443,6 @@ static inline int pwm_capture(struct pwm_device *pwm,
 	return -EINVAL;
 }
 
-static inline int pwm_set_chip_data(struct pwm_device *pwm, void *data)
-{
-	return -EINVAL;
-}
-
-static inline void *pwm_get_chip_data(struct pwm_device *pwm)
-{
-	return NULL;
-}
-
 static inline int pwmchip_add(struct pwm_chip *chip)
 {
 	return -EINVAL;