[Xen-devel] [PATCH v3 1/7] xen/device_tree: Add new helper to read arrays from a DTB

[Frediano Ziglio <frediano.ziglio@xxxxxxxxxx>]

From: Zoltan Kiss <zoltan.kiss@xxxxxxxxxx>

Signed-off-by: Zoltan Kiss <zoltan.kiss@xxxxxxxxxx>
Reviewed-by: Julien Grall <julien.grall@xxxxxxxxxx>
---
 xen/common/device_tree.c      | 13 ++++++++++---
 xen/include/xen/device_tree.h | 11 +++++++++++
 2 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
index f72b2e9..1a886c0 100644
--- a/xen/common/device_tree.c
+++ b/xen/common/device_tree.c
@@ -160,14 +160,21 @@ const void *dt_get_property(const struct dt_device_node 
*np,
 bool_t dt_property_read_u32(const struct dt_device_node *np,
                          const char *name, u32 *out_value)
 {
-    u32 len;
+    return dt_property_read_u32_array(np, name, out_value, 1);
+}
+
+bool_t dt_property_read_u32_array(const struct dt_device_node *np,
+                                  const char *name, u32 *out_value, u16 
out_len)
+{
+    u32 len, i;
     const __be32 *val;
 
     val = dt_get_property(np, name, &len);
-    if ( !val || len < sizeof(*out_value) )
+    if ( !val || len < sizeof(*out_value) * out_len )
         return 0;
 
-    *out_value = be32_to_cpup(val);
+    for ( i = 0; i < out_len; i++, val++ )
+        out_value[i] = be32_to_cpup(val);
 
     return 1;
 }
diff --git a/xen/include/xen/device_tree.h b/xen/include/xen/device_tree.h
index 08db8bc..629bfb2 100644
--- a/xen/include/xen/device_tree.h
+++ b/xen/include/xen/device_tree.h
@@ -346,6 +346,17 @@ const struct dt_property *dt_find_property(const struct 
dt_device_node *np,
 bool_t dt_property_read_u32(const struct dt_device_node *np,
                             const char *name, u32 *out_value);
 /**
+ * dt_property_read_u32_array - Helper to read a u32 array property.
+ * @np: node to get the value
+ * @name: name of the property
+ * @out_value: pointer to return value
+ * @out_len: length of the array
+ *
+ * Return true if get the desired value.
+ */
+bool_t dt_property_read_u32_array(const struct dt_device_node *np,
+                                  const char *name, u32 *out_value, u16 
out_len);
+/**
  * dt_property_read_u64 - Helper to read a u64 property.
  * @np: node to get the value
  * @name: name of the property
-- 
1.9.1



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