[PATCH v4 5/7] xen/device-tree: Make dt_match_node match props

["Edgar E. Iglesias" <edgar.iglesias@gmail.com>]

From: "Edgar E. Iglesias" <edgar.iglesias@xilinx.com>

Make dt_match_node match for a single existing property.
We only search for the existence of the property, not
for specific values.

Acked-by: Julien Grall <julien.grall@arm.com>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
---
 xen/common/device_tree.c      | 5 ++++-
 xen/include/xen/device_tree.h | 7 +++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
index b39c8ca..1be074b 100644
--- a/xen/common/device_tree.c
+++ b/xen/common/device_tree.c
@@ -319,7 +319,7 @@ dt_match_node(const struct dt_device_match *matches,
         return NULL;
 
     while ( matches->path || matches->type ||
-            matches->compatible || matches->not_available )
+            matches->compatible || matches->not_available || matches->prop)
     {
         bool_t match = 1;
 
@@ -335,6 +335,9 @@ dt_match_node(const struct dt_device_match *matches,
         if ( matches->not_available )
             match &= !dt_device_is_available(node);
 
+        if ( matches->prop )
+            match &= dt_find_property(node, matches->prop, NULL) != NULL;
+
         if ( match )
             return matches;
         matches++;
diff --git a/xen/include/xen/device_tree.h b/xen/include/xen/device_tree.h
index da153a5..0aecbe0 100644
--- a/xen/include/xen/device_tree.h
+++ b/xen/include/xen/device_tree.h
@@ -29,6 +29,11 @@ struct dt_device_match {
     const char *type;
     const char *compatible;
     const bool_t not_available;
+    /*
+     * Property name to search for. We only search for the property's
+     * existence.
+     */
+    const char *prop;
     const void *data;
 };
 
@@ -36,11 +41,13 @@ struct dt_device_match {
 #define __DT_MATCH_TYPE(typ)            .type = typ
 #define __DT_MATCH_COMPATIBLE(compat)   .compatible = compat
 #define __DT_MATCH_NOT_AVAILABLE()      .not_available = 1
+#define __DT_MATCH_PROP(p)              .prop = p
 
 #define DT_MATCH_PATH(p)                { __DT_MATCH_PATH(p) }
 #define DT_MATCH_TYPE(typ)              { __DT_MATCH_TYPE(typ) }
 #define DT_MATCH_COMPATIBLE(compat)     { __DT_MATCH_COMPATIBLE(compat) }
 #define DT_MATCH_NOT_AVAILABLE()        { __DT_MATCH_NOT_AVAILABLE() }
+#define DT_MATCH_PROP(p)                { __DT_MATCH_PROP(p) }
 
 typedef u32 dt_phandle;
 
-- 
2.7.4


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