[Xen-devel] [PATCH 4/8] device tree: add device_tree_dump() to print a flat device tree

[David Vrabel <david.vrabel@xxxxxxxxxx>]

From: David Vrabel <david.vrabel@xxxxxxxxxx>

Add a device_tree_dump() function which prints to main structure and
properties names of a flat device tree (but not the properties values
yet).

This will be useful for debugging problems with the device tree
generated for dom0.

Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
---
 xen/common/device_tree.c      |   38 ++++++++++++++++++++++++++++++++++++++
 xen/include/xen/device_tree.h |    1 +
 2 files changed, 39 insertions(+), 0 deletions(-)

diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
index e95ff3c..dbc4f61 100644
--- a/xen/common/device_tree.c
+++ b/xen/common/device_tree.c
@@ -101,6 +101,44 @@ int device_tree_for_each_node(const void *fdt,
     return 0;
 }
 
+static int dump_node(const void *fdt, int node, const char *name, int depth,
+                     u32 address_cells, u32 size_cells, void *data)
+{
+    char prefix[2*MAX_DEPTH + 1] = "";
+    int i;
+    int prop;
+
+    for (i = 0; i < depth; i++)
+        safe_strcat(prefix, "  ");
+
+    if (name[0] == '\0')
+        name = "/";
+    printk("%s%s:\n", prefix, name);
+
+    for (prop = fdt_first_property_offset(fdt, node);
+         prop >= 0;
+         prop = fdt_next_property_offset(fdt, prop))
+    {
+        const struct fdt_property *p;
+
+        p = fdt_get_property_by_offset(fdt, prop, NULL);
+
+        printk("%s  %s\n", prefix, fdt_string(fdt, fdt32_to_cpu(p->nameoff)));
+    }
+
+    return 0;
+}
+
+/**
+ * device_tree_dump - print a text representation of a device tree
+ * @fdt: flat device tree to print
+ */
+void device_tree_dump(const void *fdt)
+{
+    device_tree_for_each_node(fdt, dump_node, NULL);
+}
+
+
 static void __init process_memory_node(const void *fdt, int node, const char 
*name,
                                        u32 address_cells, u32 size_cells)
 {
diff --git a/xen/include/xen/device_tree.h b/xen/include/xen/device_tree.h
index 505f3e3..b91b39f 100644
--- a/xen/include/xen/device_tree.h
+++ b/xen/include/xen/device_tree.h
@@ -41,5 +41,6 @@ paddr_t device_tree_get_xen_paddr(void);
 
 int device_tree_for_each_node(const void *fdt,
                               device_tree_node_func func, void *data);
+void device_tree_dump(const void *fdt);
 
 #endif
-- 
1.7.2.5


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