Merge tag 'devicetree-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[linux-beck.git] / drivers / of / base.c

diff --git a/drivers/of/base.c b/drivers/of/base.c
index f2be7c860cf24c6933fd23f653260de8cef5fd78..36536b6a8834acd270a4813ff551432946d9e381 100644 (file)
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1271,6 +1271,39 @@ int of_property_read_u64(const struct device_node *np, const char *propname,
 }
 EXPORT_SYMBOL_GPL(of_property_read_u64);
 
+/**
+ * of_property_read_u64_array - Find and read an array of 64 bit integers
+ * from a property.
+ *
+ * @np:                device node from which the property value is to be read.
+ * @propname:  name of the property to be searched.
+ * @out_values:        pointer to return value, modified only if return value is 0.
+ * @sz:                number of array elements to read
+ *
+ * Search for a property in a device node and read 64-bit value(s) from
+ * it. Returns 0 on success, -EINVAL if the property does not exist,
+ * -ENODATA if property does not have a value, and -EOVERFLOW if the
+ * property data isn't large enough.
+ *
+ * The out_values is modified only if a valid u64 value can be decoded.
+ */
+int of_property_read_u64_array(const struct device_node *np,
+                              const char *propname, u64 *out_values,
+                              size_t sz)
+{
+       const __be32 *val = of_find_property_value_of_size(np, propname,
+                                               (sz * sizeof(*out_values)));
+
+       if (IS_ERR(val))
+               return PTR_ERR(val);
+
+       while (sz--) {
+               *out_values++ = of_read_number(val, 2);
+               val += 2;
+       }
+       return 0;
+}
+
 /**
  * of_property_read_string - Find and read a string from a property
  * @np:                device node from which the property value is to be read.