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: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Gerald Van Baren <vanbaren@cideas.com>

common/fdt_support.c

diff --git a/common/fdt_support.c b/common/fdt_support.c
index b7d4fe5..b6f252a 100644
--- a/common/fdt_support.c
+++ b/common/fdt_support.c
@@ -976,3 +976,16 @@
 	}
 }
 #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

diff --git a/include/fdt_support.h b/include/fdt_support.h
index a3d5f8c..9a453af 100644
--- a/include/fdt_support.h
+++ b/include/fdt_support.h
@@ -82,6 +82,7 @@
 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 */