device_tree: Add qemu_fdt_node_unit_path

This helper allows to retrieve the paths of nodes whose name
match node-name or node-name@unit-address patterns.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Message-id: 1530044492-24921-2-git-send-email-eric.auger@redhat.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/include/sysemu/device_tree.h b/include/sysemu/device_tree.h
index e22e5be..c16fd69 100644
--- a/include/sysemu/device_tree.h
+++ b/include/sysemu/device_tree.h
@@ -43,6 +43,22 @@ void *load_device_tree_from_sysfs(void);
 char **qemu_fdt_node_path(void *fdt, const char *name, char *compat,
                           Error **errp);
 
+/**
+ * qemu_fdt_node_unit_path: return the paths of nodes matching a given
+ * node-name, ie. node-name and node-name@unit-address
+ * @fdt: pointer to the dt blob
+ * @name: node name
+ * @errp: handle to an error object
+ *
+ * returns a newly allocated NULL-terminated array of node paths.
+ * Use g_strfreev() to free it. If one or more nodes were found, the
+ * array contains the path of each node and the last element equals to
+ * NULL. If there is no error but no matching node was found, the
+ * returned array contains a single element equal to NULL. If an error
+ * was encountered when parsing the blob, the function returns NULL
+ */
+char **qemu_fdt_node_unit_path(void *fdt, const char *name, Error **errp);
+
 int qemu_fdt_setprop(void *fdt, const char *node_path,
                      const char *property, const void *val, int size);
 int qemu_fdt_setprop_cell(void *fdt, const char *node_path,