3 files changed, 39 insertions, 0 deletions
diff --git a/include/dm/of_access.h b/include/dm/of_access.h
index 5ed1a0cdb42..13fedb7cf5e 100644
--- a/include/dm/of_access.h
+++ b/include/dm/of_access.h
@@ -425,6 +425,16 @@ int of_alias_scan(void);
 int of_alias_get_id(const struct device_node *np, const char *stem);
 
 /**
+ * of_alias_get_highest_id - Get highest alias id for the given stem
+ * @stem:	Alias stem to be examined
+ *
+ * The function travels the lookup table to get the highest alias id for the
+ * given alias stem.
+ * @return alias ID, if found, else -1
+ */
+int of_alias_get_highest_id(const char *stem);
+
+/**
  * of_get_stdout() - Get node to use for stdout
  *
  * @return node referred to by stdout-path alias, or NULL if none
diff --git a/include/dm/read.h b/include/dm/read.h
index 389e30e7fb4..60b727cbd82 100644
--- a/include/dm/read.h
+++ b/include/dm/read.h
@@ -510,6 +510,17 @@ int dev_read_resource_byname(struct udevice *dev, const char *name,
  * @return the translated address; OF_BAD_ADDR on error
  */
 u64 dev_translate_address(struct udevice *dev, const fdt32_t *in_addr);
+
+/**
+ * dev_read_alias_highest_id - Get highest alias id for the given stem
+ * @stem:	Alias stem to be examined
+ *
+ * The function travels the lookup table to get the highest alias id for the
+ * given alias stem.
+ * @return alias ID, if found, else -1
+ */
+int dev_read_alias_highest_id(const char *stem);
+
 #else /* CONFIG_DM_DEV_READ_INLINE is enabled */
 
 static inline int dev_read_u32(struct udevice *dev,
@@ -740,6 +751,11 @@ static inline u64 dev_translate_address(struct udevice *dev, const fdt32_t *in_a
 	return ofnode_translate_address(dev_ofnode(dev), in_addr);
 }
 
+static inline int dev_read_alias_highest_id(const char *stem)
+{
+	return fdtdec_get_alias_highest_id(gd->fdt_blob, stem);
+}
+
 #endif /* CONFIG_DM_DEV_READ_INLINE */
 
 /**
diff --git a/include/fdtdec.h b/include/fdtdec.h
index 2a8ad960260..b7e35cd87c5 100644
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -619,6 +619,19 @@ int fdtdec_get_alias_seq(const void *blob, const char *base, int node,
 			 int *seqp);
 
 /**
+ * Get the highest alias number for susbystem.
+ *
+ * It parses all aliases and find out highest recorded alias for subsystem.
+ * Aliases are of the form <base><num> where <num> is the sequence number.
+ *
+ * @param blob		Device tree blob (if NULL, then error is returned)
+ * @param base		Base name for alias susbystem (before the number)
+ *
+ * @return 0 highest alias ID, -1 if not found
+ */
+int fdtdec_get_alias_highest_id(const void *blob, const char *base);
+
+/**
  * Get a property from the /chosen node
  *
  * @param blob		Device tree blob (if NULL, then NULL is returned)