nitrogen8m: use common ddr files

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>

board/boundary/nitrogen8m/Makefile

@@ -8,5 +8,9 @@ obj-y += nitrogen8m.o mmc.o
 
 ifdef CONFIG_SPL_BUILD
 obj-y += spl.o
+ifdef CONFIG_IMX8M_LPDDR4
+obj-y += lpddr4_timing.o
+else
 obj-y += ddr/ddr_init.o ddr/ddrphy_train.o ddr/helper.o
 endif
+endif

board/boundary/nitrogen8m/spl.c

@@ -19,15 +19,23 @@
 #include <asm/mach-imx/mxc_i2c.h>
 #include <fsl_esdhc.h>
 #include <mmc.h>
+#ifdef CONFIG_IMX8M_LPDDR4
+#include <asm/arch/imx8m_ddr.h>
+#else
 #include "ddr/ddr.h"
 #include "ddr/ddr_memory_map.h"
+#endif
 
 DECLARE_GLOBAL_DATA_PTR;
 
 void spl_dram_init(void)
 {
 	/* ddr init */
+#ifdef CONFIG_IMX8M_LPDDR4
+	ddr_init(&lpddr4_timing);
+#else
 	ddr_init();
+#endif
 }
 
 #define I2C_PAD_CTRL	(PAD_CTL_DSE6 | PAD_CTL_HYS | PAD_CTL_PUE)

configs/nitrogen8m_defconfig

 CONFIG_ARM=y
 CONFIG_ARCH_IMX8M=y
 CONFIG_SYS_TEXT_BASE=0x40200000
+# CONFIG_IMX8M_LPDDR4=y
 CONFIG_SPL_GPIO_SUPPORT=y
 CONFIG_SPL_LIBCOMMON_SUPPORT=y
 CONFIG_SPL_LIBGENERIC_SUPPORT=y