dt: add helper function to read u32 arrays
Rework of_property_read_u32 to read an array of values. Then
of_property_read_u32 becomes an inline with array size of 1.
Also make struct device_node ptr const.
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 57ec27b..02ed367 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -596,32 +596,39 @@
EXPORT_SYMBOL(of_find_node_by_phandle);
/**
- * of_property_read_u32 - Find and read a 32 bit integer from a property
+ * of_property_read_u32_array - Find and read an array of 32 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_value: pointer to return value, modified only if return value is 0.
*
- * Search for a property in a device node and read a 32-bit value from
+ * Search for a property in a device node and read 32-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_value is modified only if a valid u32 value can be decoded.
*/
-int of_property_read_u32(struct device_node *np, char *propname, u32 *out_value)
+int of_property_read_u32_array(const struct device_node *np, char *propname,
+ u32 *out_values, size_t sz)
{
struct property *prop = of_find_property(np, propname, NULL);
+ const __be32 *val;
if (!prop)
return -EINVAL;
if (!prop->value)
return -ENODATA;
- if (sizeof(*out_value) > prop->length)
+ if ((sz * sizeof(*out_values)) > prop->length)
return -EOVERFLOW;
- *out_value = be32_to_cpup(prop->value);
+
+ val = prop->value;
+ while (sz--)
+ *out_values++ = be32_to_cpup(val++);
return 0;
}
-EXPORT_SYMBOL_GPL(of_property_read_u32);
+EXPORT_SYMBOL_GPL(of_property_read_u32_array);
/**
* of_property_read_string - Find and read a string from a property