stm32mp1: ram: add support for LPDDR2/LPDDR3

Manage power supply configuration for board using stpmic1
with LPDDR2 or with LPDDR3:
+ VDD_DDR1 = 1.8V with BUCK3 (bypass if possible)
+ VDD_DDR2 = 1.2V with BUCK2

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>

arch/arm/mach-stm32mp/include/mach/ddr.h

@@ -6,6 +6,13 @@
 #ifndef __MACH_STM32MP_DDR_H_
 #define __MACH_STM32MP_DDR_H_
 
-int board_ddr_power_init(void);
+/* DDR power initializations */
+enum ddr_type {
+	STM32MP_DDR3,
+	STM32MP_LPDDR2,
+	STM32MP_LPDDR3,
+};
+
+int board_ddr_power_init(enum ddr_type ddr_type);
 
 #endif