diff --git a/include/dm/device-internal.h b/include/dm/device-internal.h
index 71e5c75028..e6b71cbfd2 100644
--- a/include/dm/device-internal.h
+++ b/include/dm/device-internal.h
@@ -284,6 +284,9 @@ static inline int device_chld_remove(struct udevice *dev, struct driver *drv,
  * Use this function to override normal operation for special situations, such
  * as needing to allocate a variable amount of data.
  *
+ * If OF_PLATDATA_RT is enabled, this function cannot be used out of core driver
+ * model code, since the pointer must be within the gd->dm_priv_base region.
+ *
  * @dev		Device to check
  * @priv	New private-data pointer
  */
@@ -298,6 +301,9 @@ void dev_set_priv(struct udevice *dev, void *priv);
  * Use this function to override normal operation for special situations, such
  * as needing to allocate a variable amount of data.
  *
+ * If OF_PLATDATA_RT is enabled, this function cannot be used out of core driver
+ * model code, since the pointer must be within the gd->dm_priv_base region.
+ *
  * @dev:	Device to update
  * @parent_priv: New parent-private data
  */
@@ -312,6 +318,9 @@ void dev_set_parent_priv(struct udevice *dev, void *parent_priv);
  * Use this function to override normal operation for special situations, such
  * as needing to allocate a variable amount of data.
  *
+ * If OF_PLATDATA_RT is enabled, this function cannot be used out of core driver
+ * model code, since the pointer must be within the gd->dm_priv_base region.
+ *
  * @dev:	Device to update
  * @uclass_priv: New uclass private data
  */
@@ -326,6 +335,9 @@ void dev_set_uclass_priv(struct udevice *dev, void *uclass_priv);
  * Use this function to override normal operation for special situations, such
  * as needing to allocate a variable amount of data.
  *
+ * If OF_PLATDATA_RT is enabled, this function cannot be used out of core driver
+ * model code, since the pointer must be within the gd->dm_priv_base region.
+ *
  * @dev		Device to check
  * @plat	New platform-data pointer
  */
@@ -340,6 +352,9 @@ void dev_set_plat(struct udevice *dev, void *priv);
  * Use this function to override normal operation for special situations, such
  * as needing to allocate a variable amount of data.
  *
+ * If OF_PLATDATA_RT is enabled, this function cannot be used out of core driver
+ * model code, since the pointer must be within the gd->dm_priv_base region.
+ *
  * @dev:	Device to update
  * @parent_plat: New parent platform data
  */
@@ -354,6 +369,9 @@ void dev_set_parent_plat(struct udevice *dev, void *parent_plat);
  * Use this function to override normal operation for special situations, such
  * as needing to allocate a variable amount of data.
  *
+ * If OF_PLATDATA_RT is enabled, this function cannot be used out of core driver
+ * model code, since the pointer must be within the gd->dm_priv_base region.
+ *
  * @dev:	Device to update
  * @uclass_plat: New uclass platform data
  */
diff --git a/include/dm/uclass-internal.h b/include/dm/uclass-internal.h
index f2a780682b..57c664c6da 100644
--- a/include/dm/uclass-internal.h
+++ b/include/dm/uclass-internal.h
@@ -69,6 +69,9 @@
  * Use this function to override normal operation for special situations, such
  * as needing to allocate a variable amount of data.
  *
+ * If OF_PLATDATA_RT is enabled, this function cannot be used out of core driver
+ * model code, since the pointer must be within the gd->dm_priv_base region.
+ *
  * @uc		Uclass to update
  * @priv	New private-data pointer
  */