mmc: zynq: Add OF initialization support

Enable initialize sdhci from DTB.
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>

arch/arm/include/asm/arch-zynq/sys_proto.h

@@ -19,5 +19,6 @@ extern void zynq_ddrc_init(void);
 
 /* Driver extern functions */
 extern int zynq_sdhci_init(u32 regbase);
+extern int zynq_sdhci_of_init(const void *blob);
 
 #endif /* _SYS_PROTO_H_ */

drivers/mmc/zynq_sdhci.c

@@ -7,6 +7,8 @@
  */
 
 #include <common.h>
+#include <fdtdec.h>
+#include <libfdt.h>
 #include <malloc.h>
 #include <sdhci.h>
 #include <asm/arch/sys_proto.h>
@@ -32,3 +34,30 @@ int zynq_sdhci_init(u32 regbase)
 	add_sdhci(host, 52000000, 52000000 >> 9);
 	return 0;
 }
+
+#ifdef CONFIG_OF_CONTROL
+int zynq_sdhci_of_init(const void *blob)
+{
+	int offset = 0;
+	u32 ret = 0;
+	u32 reg;
+
+	debug("ZYNQ SDHCI: Initialization\n");
+
+	do {
+		offset = fdt_node_offset_by_compatible(blob, offset,
+					"arasan,sdhci-8.9a");
+		if (offset != -1) {
+			reg = fdtdec_get_addr(blob, offset, "reg");
+			if (reg != FDT_ADDR_T_NONE) {
+				ret |= zynq_sdhci_init(reg);
+			} else {
+				debug("ZYNQ SDHCI: Can't get base address\n");
+				return -1;
+			}
+		}
+	} while (offset != -1);
+
+	return ret;
+}
+#endif