1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/string.h>
4 #include <linux/slab.h>
8 #include "of_helpers.h"
11 * pseries_of_derive_parent - basically like dirname(1)
12 * @path: the full_name of a node to be added to the tree
14 * Returns the node which should be the parent of the node
15 * described by path. E.g., for path = "/foo/bar", returns
16 * the node with full_name = "/foo".
18 struct device_node *pseries_of_derive_parent(const char *path)
20 struct device_node *parent;
21 char *parent_path = "/";
24 /* We do not want the trailing '/' character */
25 tail = kbasename(path) - 1;
27 /* reject if path is "/" */
28 if (!strcmp(path, "/"))
29 return ERR_PTR(-EINVAL);
32 parent_path = kstrndup(path, tail - path, GFP_KERNEL);
34 return ERR_PTR(-ENOMEM);
36 parent = of_find_node_by_path(parent_path);
37 if (strcmp(parent_path, "/"))
39 return parent ? parent : ERR_PTR(-EINVAL);
43 /* Helper Routines to convert between drc_index to cpu numbers */
45 int of_read_drc_info_cell(struct property **prop, const __be32 **curval,
46 struct of_drc_info *data)
54 /* Get drc-type:encode-string */
55 p = data->drc_type = (char*) (*curval);
56 p = of_prop_next_string(*prop, p);
60 /* Get drc-name-prefix:encode-string */
61 data->drc_name_prefix = (char *)p;
62 p = of_prop_next_string(*prop, p);
66 /* Get drc-index-start:encode-int */
67 p2 = (const __be32 *)p;
68 p2 = of_prop_next_u32(*prop, p2, &data->drc_index_start);
72 /* Get drc-name-suffix-start:encode-int */
73 p2 = of_prop_next_u32(*prop, p2, &data->drc_name_suffix_start);
77 /* Get number-sequential-elements:encode-int */
78 p2 = of_prop_next_u32(*prop, p2, &data->num_sequential_elems);
82 /* Get sequential-increment:encode-int */
83 p2 = of_prop_next_u32(*prop, p2, &data->sequential_inc);
87 /* Get drc-power-domain:encode-int */
88 p2 = of_prop_next_u32(*prop, p2, &data->drc_power_domain);
92 /* Should now know end of current entry */
93 (*curval) = (void *)p2;
94 data->last_drc_index = data->drc_index_start +
95 ((data->num_sequential_elems - 1) * data->sequential_inc);
99 EXPORT_SYMBOL(of_read_drc_info_cell);