[PATCH v3 2/4] serdev: add rust private data to serdev_device

[Markus Probst <markus.probst@posteo.de>]

Add rust private data to `struct serdev_device`, as it is required by the
rust abstraction added in the following commit
(rust: add basic serial device bus abstractions).

Signed-off-by: Markus Probst <markus.probst@posteo.de>
---
 include/linux/serdev.h | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/include/linux/serdev.h b/include/linux/serdev.h
index 5654c58eb73c..c74c345d60ae 100644
--- a/include/linux/serdev.h
+++ b/include/linux/serdev.h
@@ -33,12 +33,14 @@ struct serdev_device_ops {
 
 /**
  * struct serdev_device - Basic representation of an serdev device
- * @dev:	Driver model representation of the device.
- * @nr:		Device number on serdev bus.
- * @ctrl:	serdev controller managing this device.
- * @ops:	Device operations.
- * @write_comp	Completion used by serdev_device_write() internally
- * @write_lock	Lock to serialize access when writing data
+ * @dev:	       Driver model representation of the device.
+ * @nr:		       Device number on serdev bus.
+ * @ctrl:	       serdev controller managing this device.
+ * @ops:	       Device operations.
+ * @write_comp:	       Completion used by serdev_device_write() internally
+ * @write_lock:	       Lock to serialize access when writing data
+ * @rust_private_data: Private data for the rust abstraction. This should
+ *		       not be used by the C drivers.
  */
 struct serdev_device {
 	struct device dev;
@@ -47,6 +49,7 @@ struct serdev_device {
 	const struct serdev_device_ops *ops;
 	struct completion write_comp;
 	struct mutex write_lock;
+	void *rust_private_data;
 };
 
 static inline struct serdev_device *to_serdev_device(struct device *d)

-- 
2.52.0