dm: core: Scan "/firmware" node by default

All Linux firmware drivers are put under "/firmware" node
and it has support to populate "/firmware" node by default.

u-boot and Linux can share same DTB. In this case, driver
probe for devices under "/firmware" will not be invoked
as "/firmware" does not have its own "compatible" property.

This patch scans "/firmware" node by default like "/clocks".
Signed-off-by: NRajan Vaja <rajan.vaja@xilinx.com>
Reviewed-by: NSimon Glass <sjg@chromium.org>

drivers/core/root.c

@@ -357,8 +357,14 @@ int dm_extended_scan_fdt(const void *blob, bool pre_reloc_only)
 	}
 
 	ret = dm_scan_fdt_ofnode_path("/clocks", pre_reloc_only);
-	if (ret)
+	if (ret) {
 		debug("scan for /clocks failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = dm_scan_fdt_ofnode_path("/firmware", pre_reloc_only);
+	if (ret)
+		debug("scan for /firmware failed: %d\n", ret);
 
 	return ret;
 }