i2c: Warn on deprecated binding model use

Let the kernel developers know that i2c_attach_client() and
i2c_detach_client() are deprecated and should no longer be used.
Drivers using these should be converted to the standard device
driver binding model (probe and remove methods.)
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Ben Dooks <ben-linux@fluff.org>

include/linux/i2c.h

@@ -151,7 +151,7 @@ struct i2c_driver {
 	 * has been dynamically allocated by the driver in the function above,
 	 * it must be freed here.  (LEGACY I2C DRIVERS ONLY)
 	 */
-	int (*detach_client)(struct i2c_client *);
+	int (*detach_client)(struct i2c_client *) __deprecated;
 
 	/* Standard driver model interfaces, for "new style" i2c drivers.
 	 * With the driver model, device enumeration is NEVER done by drivers;
@@ -429,8 +429,10 @@ static inline int i2c_add_driver(struct i2c_driver *driver)
 	return i2c_register_driver(THIS_MODULE, driver);
 }
 
-extern int i2c_attach_client(struct i2c_client *);
-extern int i2c_detach_client(struct i2c_client *);
+/* These are deprecated, your driver should use the standard .probe()
+ * and .remove() methods instead. */
+extern int __deprecated i2c_attach_client(struct i2c_client *);
+extern int __deprecated i2c_detach_client(struct i2c_client *);
 
 extern struct i2c_client *i2c_use_client(struct i2c_client *client);
 extern void i2c_release_client(struct i2c_client *client);