1 files changed, 76 insertions, 0 deletions

diff --git a/include/linux/of.h b/include/linux/of.h
index 435cb995904d..83d1ac80c91e 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -198,6 +198,8 @@ extern struct device_node *of_find_node_with_property(
 extern struct property *of_find_property(const struct device_node *np,
                                          const char *name,
                                          int *lenp);
+extern int of_property_count_elems_of_size(const struct device_node *np,
+                                const char *propname, int elem_size);
 extern int of_property_read_u32_index(const struct device_node *np,
                                        const char *propname,
                                        u32 index, u32 *out_value);
@@ -390,6 +392,12 @@ static inline struct device_node *of_find_compatible_node(
         return NULL;
 }
 
+static inline int of_property_count_elems_of_size(const struct device_node *np,
+                        const char *propname, int elem_size)
+{
+        return -ENOSYS;
+}
+
 static inline int of_property_read_u32_index(const struct device_node *np,
                         const char *propname, u32 index, u32 *out_value)
 {
@@ -536,6 +544,74 @@ static inline struct device_node *of_find_matching_node(
 }
 
 /**
+ * of_property_count_u8_elems - Count the number of u8 elements in a property
+ *
+ * @np:         device node from which the property value is to be read.
+ * @propname:   name of the property to be searched.
+ *
+ * Search for a property in a device node and count the number of u8 elements
+ * in it. Returns number of elements on sucess, -EINVAL if the property does
+ * not exist or its length does not match a multiple of u8 and -ENODATA if the
+ * property does not have a value.
+ */
+static inline int of_property_count_u8_elems(const struct device_node *np,
+                                const char *propname)
+{
+        return of_property_count_elems_of_size(np, propname, sizeof(u8));
+}
+
+/**
+ * of_property_count_u16_elems - Count the number of u16 elements in a property
+ *
+ * @np:         device node from which the property value is to be read.
+ * @propname:   name of the property to be searched.
+ *
+ * Search for a property in a device node and count the number of u16 elements
+ * in it. Returns number of elements on sucess, -EINVAL if the property does
+ * not exist or its length does not match a multiple of u16 and -ENODATA if the
+ * property does not have a value.
+ */
+static inline int of_property_count_u16_elems(const struct device_node *np,
+                                const char *propname)
+{
+        return of_property_count_elems_of_size(np, propname, sizeof(u16));
+}
+
+/**
+ * of_property_count_u32_elems - Count the number of u32 elements in a property
+ *
+ * @np:         device node from which the property value is to be read.
+ * @propname:   name of the property to be searched.
+ *
+ * Search for a property in a device node and count the number of u32 elements
+ * in it. Returns number of elements on sucess, -EINVAL if the property does
+ * not exist or its length does not match a multiple of u32 and -ENODATA if the
+ * property does not have a value.
+ */
+static inline int of_property_count_u32_elems(const struct device_node *np,
+                                const char *propname)
+{
+        return of_property_count_elems_of_size(np, propname, sizeof(u32));
+}
+
+/**
+ * of_property_count_u64_elems - Count the number of u64 elements in a property
+ *
+ * @np:         device node from which the property value is to be read.
+ * @propname:   name of the property to be searched.
+ *
+ * Search for a property in a device node and count the number of u64 elements
+ * in it. Returns number of elements on sucess, -EINVAL if the property does
+ * not exist or its length does not match a multiple of u64 and -ENODATA if the
+ * property does not have a value.
+ */
+static inline int of_property_count_u64_elems(const struct device_node *np,
+                                const char *propname)
+{
+        return of_property_count_elems_of_size(np, propname, sizeof(u64));
+}
+
+/**
  * of_property_read_bool - Findfrom a property
  * @np:         device node from which the property value is to be read.
  * @propname:   name of the property to be searched.