tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Self tests for device tree subsystem
3 */
4
5#define pr_fmt(fmt) "### dt-test ### " fmt
6
7#include <linux/clk.h>
8#include <linux/err.h>
9#include <linux/errno.h>
10#include <linux/module.h>
11#include <linux/of.h>
12#include <linux/list.h>
13#include <linux/mutex.h>
14#include <linux/slab.h>
15#include <linux/device.h>
16
17static bool selftest_passed = true;
18#define selftest(result, fmt, ...) { \
19 if (!(result)) { \
20 pr_err("FAIL %s:%i " fmt, __FILE__, __LINE__, ##__VA_ARGS__); \
21 selftest_passed = false; \
22 } else { \
23 pr_info("pass %s:%i\n", __FILE__, __LINE__); \
24 } \
25}
26
27static void __init of_selftest_parse_phandle_with_args(void)
28{
29 struct device_node *np;
30 struct of_phandle_args args;
31 int i, rc;
32
33 np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
34 if (!np) {
35 pr_err("missing testcase data\n");
36 return;
37 }
38
39 rc = of_count_phandle_with_args(np, "phandle-list", "#phandle-cells");
40 selftest(rc == 7, "of_count_phandle_with_args() returned %i, expected 7\n", rc);
41
42 for (i = 0; i < 8; i++) {
43 bool passed = true;
44 rc = of_parse_phandle_with_args(np, "phandle-list",
45 "#phandle-cells", i, &args);
46
47 /* Test the values from tests-phandle.dtsi */
48 switch (i) {
49 case 0:
50 passed &= !rc;
51 passed &= (args.args_count == 1);
52 passed &= (args.args[0] == (i + 1));
53 break;
54 case 1:
55 passed &= !rc;
56 passed &= (args.args_count == 2);
57 passed &= (args.args[0] == (i + 1));
58 passed &= (args.args[1] == 0);
59 break;
60 case 2:
61 passed &= (rc == -ENOENT);
62 break;
63 case 3:
64 passed &= !rc;
65 passed &= (args.args_count == 3);
66 passed &= (args.args[0] == (i + 1));
67 passed &= (args.args[1] == 4);
68 passed &= (args.args[2] == 3);
69 break;
70 case 4:
71 passed &= !rc;
72 passed &= (args.args_count == 2);
73 passed &= (args.args[0] == (i + 1));
74 passed &= (args.args[1] == 100);
75 break;
76 case 5:
77 passed &= !rc;
78 passed &= (args.args_count == 0);
79 break;
80 case 6:
81 passed &= !rc;
82 passed &= (args.args_count == 1);
83 passed &= (args.args[0] == (i + 1));
84 break;
85 case 7:
86 passed &= (rc == -ENOENT);
87 break;
88 default:
89 passed = false;
90 }
91
92 selftest(passed, "index %i - data error on node %s rc=%i\n",
93 i, args.np->full_name, rc);
94 }
95
96 /* Check for missing list property */
97 rc = of_parse_phandle_with_args(np, "phandle-list-missing",
98 "#phandle-cells", 0, &args);
99 selftest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
100 rc = of_count_phandle_with_args(np, "phandle-list-missing",
101 "#phandle-cells");
102 selftest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
103
104 /* Check for missing cells property */
105 rc = of_parse_phandle_with_args(np, "phandle-list",
106 "#phandle-cells-missing", 0, &args);
107 selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
108 rc = of_count_phandle_with_args(np, "phandle-list",
109 "#phandle-cells-missing");
110 selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
111
112 /* Check for bad phandle in list */
113 rc = of_parse_phandle_with_args(np, "phandle-list-bad-phandle",
114 "#phandle-cells", 0, &args);
115 selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
116 rc = of_count_phandle_with_args(np, "phandle-list-bad-phandle",
117 "#phandle-cells");
118 selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
119
120 /* Check for incorrectly formed argument list */
121 rc = of_parse_phandle_with_args(np, "phandle-list-bad-args",
122 "#phandle-cells", 1, &args);
123 selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
124 rc = of_count_phandle_with_args(np, "phandle-list-bad-args",
125 "#phandle-cells");
126 selftest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
127}
128
129static void __init of_selftest_property_match_string(void)
130{
131 struct device_node *np;
132 int rc;
133
134 pr_info("start\n");
135 np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
136 if (!np) {
137 pr_err("No testcase data in device tree\n");
138 return;
139 }
140
141 rc = of_property_match_string(np, "phandle-list-names", "first");
142 selftest(rc == 0, "first expected:0 got:%i\n", rc);
143 rc = of_property_match_string(np, "phandle-list-names", "second");
144 selftest(rc == 1, "second expected:0 got:%i\n", rc);
145 rc = of_property_match_string(np, "phandle-list-names", "third");
146 selftest(rc == 2, "third expected:0 got:%i\n", rc);
147 rc = of_property_match_string(np, "phandle-list-names", "fourth");
148 selftest(rc == -ENODATA, "unmatched string; rc=%i", rc);
149 rc = of_property_match_string(np, "missing-property", "blah");
150 selftest(rc == -EINVAL, "missing property; rc=%i", rc);
151 rc = of_property_match_string(np, "empty-property", "blah");
152 selftest(rc == -ENODATA, "empty property; rc=%i", rc);
153 rc = of_property_match_string(np, "unterminated-string", "blah");
154 selftest(rc == -EILSEQ, "unterminated string; rc=%i", rc);
155}
156
157static int __init of_selftest(void)
158{
159 struct device_node *np;
160
161 np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
162 if (!np) {
163 pr_info("No testcase data in device tree; not running tests\n");
164 return 0;
165 }
166 of_node_put(np);
167
168 pr_info("start of selftest - you will see error messages\n");
169 of_selftest_parse_phandle_with_args();
170 of_selftest_property_match_string();
171 pr_info("end of selftest - %s\n", selftest_passed ? "PASS" : "FAIL");
172 return 0;
173}
174late_initcall(of_selftest);