[xen staging] xen/device-tree: Add dt_property_read_u32_array helper

[patchbot@xxxxxxx]

commit 65ca66cf42420842039eb0f61ea8bcb9f56a355e
Author:     Rahul Singh <rahul.singh@xxxxxxx>
AuthorDate: Tue Sep 28 19:18:16 2021 +0100
Commit:     Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>
CommitDate: Thu Sep 30 18:25:45 2021 -0700

    xen/device-tree: Add dt_property_read_u32_array helper
    
    Based Linux commit a67e9472da423ec47a3586920b526ebaedf25fc3
    
    Import the Linux helper of_property_read_u32_array. This function find
    and read an array of 32 bit integers from a property.
    
    Signed-off-by: Rahul Singh <rahul.singh@xxxxxxx>
    Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
    Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
 xen/include/xen/device_tree.h | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/xen/include/xen/device_tree.h b/xen/include/xen/device_tree.h
index 1693fb8e8c..3ffe3eb3d2 100644
--- a/xen/include/xen/device_tree.h
+++ b/xen/include/xen/device_tree.h
@@ -392,6 +392,36 @@ int dt_property_read_variable_u32_array(const struct 
dt_device_node *np,
                                         const char *propname, u32 *out_values,
                                         size_t sz_min, size_t sz_max);
 
+/**
+ * dt_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_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 32-bit value(s) from
+ * it.
+ *
+ * Return: 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 u32 value can be decoded.
+ */
+static inline int dt_property_read_u32_array(const struct dt_device_node *np,
+                                             const char *propname,
+                                             u32 *out_values, size_t sz)
+{
+    int ret = dt_property_read_variable_u32_array(np, propname, out_values,
+                              sz, 0);
+    if ( ret >= 0 )
+        return 0;
+    else
+        return ret;
+}
+
 /**
  * dt_property_read_bool - Check if a property exists
  * @np: node to get the value
--
generated by git-patchbot for /home/xen/git/xen.git#staging