stm32mp1: ram: add tuning in DDR interactive mode

Add command tuning for DDR interactive mode, used during
board bring-up or with CubeMX DDR tools to execute software
tuning for the DDR configuration:
- software read DQS Gating (replace the built-in one)
- Bit de-skew
- Eye Training or DQS training

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/drivers/ram/stm32mp1/Kconfig b/drivers/ram/stm32mp1/Kconfig
index 4e682b4..2fd8c7b 100644
--- a/drivers/ram/stm32mp1/Kconfig
+++ b/drivers/ram/stm32mp1/Kconfig
@@ -37,3 +37,13 @@
 	help
 		activate test support for interactive support in
 		STM32MP1 DDR controller driver: command test
+
+config STM32MP1_DDR_TUNING
+	bool "STM32MP1 DDR driver : support of tuning"
+	depends on STM32MP1_DDR_INTERACTIVE
+	default y
+	help
+		activate tuning command in STM32MP1 DDR interactive mode
+		used for DDR tuning tools
+		- DQ Deskew algorithm
+		- DQS Trimming