dts: bindings: flash_controller: stm32-qspi-nor: add writeoc property

Adds writeoc property to allow quad write opcode selection.

Signed-off-by: Georgij Cernysiov <[email protected]>

Author: GeorgeCGV

dts/bindings/flash_controller/st,stm32-qspi-nor.yaml

@@ -49,3 +49,18 @@ properties:
       required: false
       description: The width of (Q)SPI bus to which flash memory is connected.
                    Now only value of 4 (when using SIO[0123]) is supported.
+    writeoc:
+      type: string
+      required: false
+      enum:
+        - "PP_1_1_4"      # Quad data line SPI, PP 1-1-4 (0x32)
+        - "PP_1_4_4"      # Quad data line SPI, PP 1-4-4 (0x38)
+      description: |
+        The value encodes number of I/O lines used for the opcode,
+        address, and data.
+
+        There is no info about quad page program opcodes in the SFDP
+        tables, hence it has been assumed that NOR flash memory
+        supporting 1-4-4 mode also would support fast page programming.
+
+        If absent, then 1-4-4 program page is used in quad mode.