diff --git a/common/fdt_support.c b/common/fdt_support.c
index 10648b5a4a86e0d94765b94b02af7b0e4ca9fc76..f86365e8f0da60caddb0444518e72bb8e46ea0b7 100644
--- a/common/fdt_support.c
+++ b/common/fdt_support.c
@@ -454,6 +454,9 @@ int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks)
 		return err;
 	}
 
+	if (!banks)
+		return 0;
+
 	len = fdt_pack_reg(blob, tmp, start, size, banks);
 
 	err = fdt_setprop(blob, nodeoffset, "reg", tmp, len);
diff --git a/include/fdt_support.h b/include/fdt_support.h
index 0edc4fa5b1445e594368ebd6ac7c214687c9ef3d..296add01f34f9ece7f172b4a59c3cff9eb63d474 100644
--- a/include/fdt_support.h
+++ b/include/fdt_support.h
@@ -67,8 +67,34 @@ void do_fixup_by_compat(void *fdt, const char *compat,
 			const char *prop, const void *val, int len, int create);
 void do_fixup_by_compat_u32(void *fdt, const char *compat,
 			    const char *prop, u32 val, int create);
+/**
+ * Setup the memory node in the DT. Creates one if none was existing before.
+ * Calls fdt_fixup_memory_banks() to populate a single reg pair covering the
+ * whole memory.
+ *
+ * @param blob		FDT blob to update
+ * @param start		Begin of DRAM mapping in physical memory
+ * @param size		Size of the single memory bank
+ * @return 0 if ok, or -1 or -FDT_ERR_... on error
+ */
 int fdt_fixup_memory(void *blob, u64 start, u64 size);
+
+/**
+ * Fill the DT memory node with multiple memory banks.
+ * Creates the node if none was existing before.
+ * If banks is 0, it will not touch the existing reg property. This allows
+ * boards to not mess with the existing DT setup, which may have been
+ * filled in properly before.
+ *
+ * @param blob		FDT blob to update
+ * @param start		Array of size <banks> to hold the start addresses.
+ * @param size		Array of size <banks> to hold the size of each region.
+ * @param banks		Number of memory banks to create. If 0, the reg
+ *			property will be left untouched.
+ * @return 0 if ok, or -1 or -FDT_ERR_... on error
+ */
 int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks);
+
 void fdt_fixup_ethernet(void *fdt);
 int fdt_find_and_setprop(void *fdt, const char *node, const char *prop,
 			 const void *val, int len, int create);