fdt_support: call mtdparts_init() after finding MTD node to fix up

Platform code can call fdt_fixup_mtdparts() in order to hand U-Boot's
MTD partitions over to the Linux device tree.

Currently, fdt_fixup_mtdparts() calls mtdparts_init() in its entry.
If no target MTD device is found, an error message like follows is
displayed:

    Device nand0 not found!

This occurs when the same code (e.g. arch/arm/mach-uniphier/fdt-fixup.c)
is shared among several boards, but not all of them support an MTD device.

Parse the DT first, then call mtdparts_init() only when the target MTD
node is found.

Yet, you still need to call mtdparts_init() before device_find().

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

common/fdt_support.c

@@ -951,9 +951,7 @@ void fdt_fixup_mtdparts(void *blob, const struct node_info *node_info,
 	struct mtd_device *dev;
 	int i, idx;
 	int noff;
-
-	if (mtdparts_init() != 0)
-		return;
+	bool inited = false;
 
 	for (i = 0; i < node_info_size; i++) {
 		idx = 0;
@@ -963,6 +961,13 @@ void fdt_fixup_mtdparts(void *blob, const struct node_info *node_info,
 			debug("%s: %s, mtd dev type %d\n",
 				fdt_get_name(blob, noff, 0),
 				node_info[i].compat, node_info[i].type);
+
+			if (!inited) {
+				if (mtdparts_init() != 0)
+					return;
+				inited = true;
+			}
+
 			dev = device_find(node_info[i].type, idx++);
 			if (dev) {
 				if (fdt_node_set_part_info(blob, noff, dev))