ram: rockchip: Add initial Kconfig

Right now sdram drivers in rockchip SoC are built based
on the SoC configs which may not be an adequate solutions
while adding common or debug driver.

So, add meaningful Kconfig options start with rk3399.
Signed-off-by: NJagan Teki <jagan@amarulasolutions.com>
Reviewed-by: NKever Yang <Kever.yang@rock-chips.com>

drivers/ram/Kconfig

@@ -54,4 +54,5 @@ config K3_AM654_DDRSS
 	  config add support for the initialization of the external
 	  SDRAM devices connected to DDR subsystem.
 
+source "drivers/ram/rockchip/Kconfig"
 source "drivers/ram/stm32mp1/Kconfig"

drivers/ram/rockchip/Kconfig

+config RAM_ROCKCHIP
+	bool "Ram drivers support for Rockchip SoCs"
+	depends on RAM && ARCH_ROCKCHIP
+	default y
+	help
+	  This enables support for ram drivers Rockchip SoCs.
+
+if RAM_ROCKCHIP
+
+config RAM_RK3399
+	bool "Ram driver for Rockchip RK3399"
+	default ROCKCHIP_RK3399
+	help
+	  This enables ram drivers support for the platforms based on
+	  Rockchip RK3399 SoC.
+
+endif # RAM_ROCKCHIP

drivers/ram/rockchip/Makefile

@@ -9,4 +9,4 @@ obj-$(CONFIG_ROCKCHIP_RK3188) = sdram_rk3188.o
 obj-$(CONFIG_ROCKCHIP_RK322X) = sdram_rk322x.o
 obj-$(CONFIG_ROCKCHIP_RK3288) = sdram_rk3288.o
 obj-$(CONFIG_ROCKCHIP_RK3328) = sdram_rk3328.o
-obj-$(CONFIG_ROCKCHIP_RK3399) = sdram_rk3399.o
+obj-$(CONFIG_RAM_RK3399) += sdram_rk3399.o