ram: starfive: add ddr driver

Add driver for StarFive JH7110 to support ddr initialization in SPL.

Signed-off-by: Yanhong Wang <yanhong.wang@starfivetech.com>
Tested-by: Conor Dooley <conor.dooley@microchip.com>
diff --git a/drivers/ram/starfive/Makefile b/drivers/ram/starfive/Makefile
new file mode 100644
index 0000000..1df42c3
--- /dev/null
+++ b/drivers/ram/starfive/Makefile
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright (c) 2022 StarFive, Inc
+#
+ifdef CONFIG_SPL_BUILD
+obj-$(CONFIG_SPL_STARFIVE_DDR) += ddrphy_start.o
+obj-$(CONFIG_SPL_STARFIVE_DDR) += ddrphy_train.o
+obj-$(CONFIG_SPL_STARFIVE_DDR) += starfive_ddr.o
+obj-$(CONFIG_SPL_STARFIVE_DDR) += ddrphy_utils.o
+obj-$(CONFIG_SPL_STARFIVE_DDR) += ddrcsr_boot.o
+endif
\ No newline at end of file