platform_data/mlxreg: Add field for notification callback

Add notification callback to inform caller that platform driver probing
has been completed. It allows to caller to perform some initialization
flow steps depending on specific driver probing completion.
Signed-off-by: Michael Shych <michaelsh@nvidia.com>
Reviewed-by: Vadim Pasternak <vadimp@nvidia.com>
Link: https://lore.kernel.org/r/20220430115809.54565-2-michaelsh@nvidia.comSigned-off-by: Hans de Goede <hdegoede@redhat.com>

include/linux/platform_data/mlxreg.h

@@ -216,6 +216,8 @@ struct mlxreg_core_platform_data {
  * @mask_low: low aggregation interrupt common mask;
  * @deferred_nr: I2C adapter number must be exist prior probing execution;
  * @shift_nr: I2C adapter numbers must be incremented by this value;
+ * @handle: handle to be passed by callback;
+ * @completion_notify: callback to notify when platform driver probing is done;
  */
 struct mlxreg_core_hotplug_platform_data {
 	struct mlxreg_core_item *items;
@@ -228,6 +230,8 @@ struct mlxreg_core_hotplug_platform_data {
 	u32 mask_low;
 	int deferred_nr;
 	int shift_nr;
+	void *handle;
+	int (*completion_notify)(void *handle, int id);
 };
 
 #endif /* __LINUX_PLATFORM_DATA_MLXREG_H */