fdt: Add fdt_del_node_and_alias helper

Add a helper function that given an alias will delete both the node
the alias points to and the alias itself
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
Acked-by: NGerald Van Baren <vanbaren@cideas.com>

common/fdt_support.c

@@ -976,3 +976,16 @@ void fdt_fixup_mtdparts(void *blob, void *node_info, int node_info_size)
 	}
 }
 #endif
+
+void fdt_del_node_and_alias(void *blob, const char *alias)
+{
+	int off = fdt_path_offset(blob, alias);
+
+	if (off < 0)
+		return;
+
+	fdt_del_node(blob, off);
+
+	off = fdt_path_offset(blob, "/aliases");
+	fdt_delprop(blob, off, alias);
+}

include/fdt_support.h

@@ -82,6 +82,7 @@ int fdt_resize(void *blob);
 int fdt_fixup_nor_flash_size(void *blob, int cs, u32 size);
 
 void fdt_fixup_mtdparts(void *fdt, void *node_info, int node_info_size);
+void fdt_del_node_and_alias(void *blob, const char *alias);
 
 #endif /* ifdef CONFIG_OF_LIBFDT */
 #endif /* ifndef __FDT_SUPPORT_H */