This new helper routine returns a NULL terminated array of
node paths matching a property and, optionally, a name.
Signed-off-by: Bogdan Purcareata <bogdan.purcare...@nxp.com>
---
device_tree.c | 59 ++++++++++++++++++++++++++++++++++++++++++++
include/sysemu/device_tree.h | 20 +++++++++++++++
2 files changed, 79 insertions(+)
diff --git a/device_tree.c b/device_tree.c
index ccba1fd..85c81cc 100644
--- a/device_tree.c
+++ b/device_tree.c
@@ -281,6 +281,65 @@ char **qemu_fdt_node_path(void *fdt, const char *name,
char *compat,
return path_array;
}
+char **qemu_fdt_node_path_prop(void *fdt, const char *name,
+ const char *pname, const void *pval, int plen, Error **errp)
+{
+ int offset, len, ret;
+ const char *iter_name;
+ unsigned int path_len = 16, n = 0;
+ GSList *path_list = NULL, *iter;
+ char **path_array;
+
+ for (offset = fdt_node_offset_by_prop_value(fdt, 0, pname, pval, plen);
+ offset >= 0;
+ offset = fdt_node_offset_by_prop_value(fdt, offset, pname, pval, plen)) {
+
+ iter_name = fdt_get_name(fdt, offset, &len);
+
+ if (!iter_name) {
+ continue;
+ }
+
+ /* if the node doesn't match the name, move on */
+ if (name && strncmp(iter_name, name, strlen(name))) {
+ continue;
+ }
+
+ char *path;
+
+ path = g_malloc(path_len);
+ while ((ret = fdt_get_path(fdt, offset, path, path_len)) ==
+ -FDT_ERR_NOSPACE) {
+ path_len += 16;
+ path = g_realloc(path, path_len);
+ }
+
+ path_list = g_slist_prepend(path_list, path);
+ n++;
+ }
+
+ if (offset < 0 && offset != -FDT_ERR_NOTFOUND) {
+ error_setg(errp, "%s: abort parsing dt for %s/%s: %s",
+ __func__, name, pname, fdt_strerror(offset));
+ for (iter = path_list; iter; iter = iter->next) {
+ g_free(iter->data);
+ }
+ g_slist_free(path_list);
+ return NULL;
+ }
+
+ path_array = g_new(char *, n + 1);
+ path_array[n--] = NULL;
+
+ for (iter = path_list; iter; iter = iter->next) {
+ path_array[n--] = iter->data;
+ }
+
+ g_slist_free(path_list);
+
+ return path_array;
+}
+
int qemu_fdt_setprop(void *fdt, const char *node_path,
const char *property, const void *val, int size)
{
diff --git a/include/sysemu/device_tree.h b/include/sysemu/device_tree.h
index 705650a..03c8193 100644
--- a/include/sysemu/device_tree.h
+++ b/include/sysemu/device_tree.h
@@ -43,6 +43,26 @@ void *load_device_tree_from_sysfs(void);
char **qemu_fdt_node_path(void *fdt, const char *name, char *compat,
Error **errp);
+/**
+ * qemu_fdt_node_path_property: return the paths of nodes matching a given
+ * property and, optionally, a name string
+ * @fdt: pointer to the dt blob
+ * @name: node name (can be NULL) - if NULL, will return all nodes mathing prop
+ * @propname: property name
+ * @propvalue: property value (can be NULL)
+ * @proplen: property length (can be 0)
+ * @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_path_prop(void *fdt, const char *name,
+ const char *propname, const void *propvalue, int proplen, 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,
--
1.9.1
