[PATCH v5 039/111] pwm: Provide wrappers for storing and getting driver private data

[Uwe Kleine-König]

These functions are useful to store and query driver private data a
After struct pwm_chip got its own struct device, this can make use of
dev_get_drvdata() and dev_set_drvdata() on that device.  These functions
are required already now to convert drivers to pwmchip_alloc() which
must happen before changing pwm_chip::dev.

Signed-off-by: Uwe Kleine-König <u.kleine-koe...@pengutronix.de>
---
 include/linux/pwm.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index d7966918f301..2c49d2fe2fe7 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -272,6 +272,7 @@ struct pwm_ops {
  * @npwm: number of PWMs controlled by this chip
  * @of_xlate: request a PWM device given a device tree PWM specifier
  * @atomic: can the driver's ->apply() be called in atomic context
+ * @driver_data: Private pointer for driver specific info
  * @pwms: array of PWM devices allocated by the framework
  */
 struct pwm_chip {
@@ -286,6 +287,7 @@ struct pwm_chip {
        bool atomic;
 
        /* only used internally by the PWM framework */
+       void *driver_data;
        struct pwm_device *pwms;
 };
 
@@ -294,6 +296,24 @@ static inline struct device *pwmchip_parent(struct 
pwm_chip *chip)
        return chip->dev;
 }
 
+static inline void *pwmchip_get_drvdata(struct pwm_chip *chip)
+{
+       /*
+        * After pwm_chip got a dedicated struct device, this can be replaced by
+        * dev_get_drvdata(&chip->dev);
+        */
+       return chip->driver_data;
+}
+
+static inline void pwmchip_set_drvdata(struct pwm_chip *chip, void *data)
+{
+       /*
+        * After pwm_chip got a dedicated struct device, this can be replaced by
+        * dev_set_drvdata(&chip->dev, data);
+        */
+       chip->driver_data = data;
+}
+
 #if IS_ENABLED(CONFIG_PWM)
 /* PWM user APIs */
 int pwm_apply_might_sleep(struct pwm_device *pwm, const struct pwm_state 
*state);
-- 
2.43.0