dm: core: Add a function to bind child devices

We currently use dm_scan_fdt_node() to bind devices. It is an internal
function and it requires the caller to know whether we are pre- or post-
relocation.

This requirement has become quite common in drivers, so the current function
is not ideal.

Add a new function with fewer arguments, that does not require internal
headers. This can be used directly as a post_bind() method if needed.

Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/core/root.c

@@ -218,6 +218,15 @@ int dm_scan_fdt_node(struct udevice *parent, const void *blob, int offset,
 	return ret;
 }
 
+int dm_scan_fdt_dev(struct udevice *dev)
+{
+	if (dev->of_offset == -1)
+		return 0;
+
+	return dm_scan_fdt_node(dev, gd->fdt_blob, dev->of_offset,
+				gd->flags & GD_FLG_RELOC ? false : true);
+}
+
 int dm_scan_fdt(const void *blob, bool pre_reloc_only)
 {
 	return dm_scan_fdt_node(gd->dm_root, blob, 0, pre_reloc_only);