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device_tree: Add qemu_fdt_node_unit_path

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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>
This commit is contained in:
Eric Auger 2018-06-29 15:11:01 +01:00 • committed by Peter Maydell
parent 38754e43f6
commit f963cc26df
2 changed files with 71 additions and 0 deletions
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55
device_tree.c
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@ -232,6 +232,61 @@ static int findnode_nofail(void *fdt, const char *node_path)
return offset;
}
char **qemu_fdt_node_unit_path(void *fdt, const char *name, Error **errp)
{
char *prefix = g_strdup_printf("%s@", name);
unsigned int path_len = 16, n = 0;
GSList *path_list = NULL, *iter;
const char *iter_name;
int offset, len, ret;
char **path_array;
offset = fdt_next_node(fdt, -1, NULL);
while (offset >= 0) {
iter_name = fdt_get_name(fdt, offset, &len);
if (!iter_name) {
offset = len;
break;
}
if (!strcmp(iter_name, name) || g_str_has_prefix(iter_name, prefix)) {
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++;
}
offset = fdt_next_node(fdt, offset, NULL);
}
g_free(prefix);
if (offset < 0 && offset != -FDT_ERR_NOTFOUND) {
error_setg(errp, "%s: abort parsing dt for %s node units: %s",
__func__, name, 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;
}
char **qemu_fdt_node_path(void *fdt, const char *name, char *compat,
Error **errp)
{