arm: zynq: Add Kconfig option for any DDR specific initialization

Add Kconfig option for ddr init as this might be required
in cases like ddr less systems where we want to skip ddrc
init and this option is useful for it.

Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

arch/arm/mach-zynq/Kconfig

@@ -24,6 +24,14 @@ config SPL_SPI_FLASH_SUPPORT
 config SPL_SPI_SUPPORT
 	default y if ZYNQ_QSPI
 
+config ZYNQ_DDRC_INIT
+	bool "Zynq DDRC initialization"
+	default y
+	help
+	  This option used to perform DDR specific initialization
+	  if required. There might be cases like ddr less where we
+	  want to skip ddr init and this option is useful for it.
+
 config SYS_BOARD
 	default "zynq"
 

arch/arm/mach-zynq/ddrc.c

@@ -12,6 +12,9 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+#ifndef CONFIG_ZYNQ_DDRC_INIT
+void zynq_ddrc_init(void) {}
+#else
 /* Control regsiter bitfield definitions */
 #define ZYNQ_DDRC_CTRLREG_BUSWIDTH_MASK		0xC
 #define ZYNQ_DDRC_CTRLREG_BUSWIDTH_SHIFT	2
@@ -46,3 +49,4 @@ void zynq_ddrc_init(void)
 		puts("ECC disabled ");
 	}
 }
+#endif