doc: releases: migration-guide-4.1: document change to mipi-dbi binding

Document change to mipi-dbi device binding, and provide users with
example of how to transition to the new mipi-mode property.

Signed-off-by: Daniel DeGrasse <[email protected]>

doc/releases/migration-guide-4.1.rst

@@ -55,6 +55,29 @@ Controller Area Network (CAN)
 Display
 =======
 
+* Displays using the MIPI DBI driver which set their MIPI DBI mode via the
+  ``mipi-mode`` property in devicetree should now use a string property of
+  the same name, like so:
+
+  .. code-block:: devicetree
+
+    /* Legacy display definition */
+
+    st7735r: st7735r@0 {
+        ...
+        mipi-mode = <MIPI_DBI_MODE_SPI_4WIRE>;
+        ...
+    };
+
+    /* New display definition */
+
+    st7735r: st7735r@0 {
+        ...
+        mipi-mode = "MIPI_DBI_MODE_SPI_4WIRE";
+        ...
+    };
+
+
 Enhanced Serial Peripheral Interface (eSPI)
 ===========================================