of: Add self test for of_match_node()

Adds a selftest function for the of_match_node function. of_match_node
is supposed to handle precedence for the compatible property as well as
the name and device_type values. This patch adds some test case data and
a function that makes sure each test node matches against the correct
entry of an of_device_id table.

This code was written to verify the new of_match_node() implementation
that is an earlier part of this series.

Signed-off-by: Grant Likely <grant.likely@linaro.org>
Cc: Kevin Hao <haokexin@gmail.com>

3 files changed, 87 insertions, 0 deletions

diff --git a/drivers/of/selftest.c b/drivers/of/selftest.c
index e21012bde639..6643d1920985 100644
--- a/drivers/of/selftest.c
+++ b/drivers/of/selftest.c
@@ -300,6 +300,72 @@ static void __init of_selftest_parse_interrupts_extended(void)
         of_node_put(np);
 }
 
+static struct of_device_id match_node_table[] = {
+        { .data = "A", .name = "name0", }, /* Name alone is lowest priority */
+        { .data = "B", .type = "type1", }, /* followed by type alone */
+
+        { .data = "Ca", .name = "name2", .type = "type1", }, /* followed by both together */
+        { .data = "Cb", .name = "name2", }, /* Only match when type doesn't match */
+        { .data = "Cc", .name = "name2", .type = "type2", },
+
+        { .data = "E", .compatible = "compat3" },
+        { .data = "G", .compatible = "compat2", },
+        { .data = "H", .compatible = "compat2", .name = "name5", },
+        { .data = "I", .compatible = "compat2", .type = "type1", },
+        { .data = "J", .compatible = "compat2", .type = "type1", .name = "name8", },
+        { .data = "K", .compatible = "compat2", .name = "name9", },
+        {}
+};
+
+static struct {
+        const char *path;
+        const char *data;
+} match_node_tests[] = {
+        { .path = "/testcase-data/match-node/name0", .data = "A", },
+        { .path = "/testcase-data/match-node/name1", .data = "B", },
+        { .path = "/testcase-data/match-node/a/name2", .data = "Ca", },
+        { .path = "/testcase-data/match-node/b/name2", .data = "Cb", },
+        { .path = "/testcase-data/match-node/c/name2", .data = "Cc", },
+        { .path = "/testcase-data/match-node/name3", .data = "E", },
+        { .path = "/testcase-data/match-node/name4", .data = "G", },
+        { .path = "/testcase-data/match-node/name5", .data = "H", },
+        { .path = "/testcase-data/match-node/name6", .data = "G", },
+        { .path = "/testcase-data/match-node/name7", .data = "I", },
+        { .path = "/testcase-data/match-node/name8", .data = "J", },
+        { .path = "/testcase-data/match-node/name9", .data = "K", },
+};
+
+static void __init of_selftest_match_node(void)
+{
+        struct device_node *np;
+        const struct of_device_id *match;
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(match_node_tests); i++) {
+                np = of_find_node_by_path(match_node_tests[i].path);
+                if (!np) {
+                        selftest(0, "missing testcase node %s\n",
+                                match_node_tests[i].path);
+                        continue;
+                }
+
+                match = of_match_node(match_node_table, np);
+                if (!match) {
+                        selftest(0, "%s didn't match anything\n",
+                                match_node_tests[i].path);
+                        continue;
+                }
+
+                if (strcmp(match->data, match_node_tests[i].data) != 0) {
+                        selftest(0, "%s got wrong match. expected %s, got %s\n",
+                                match_node_tests[i].path, match_node_tests[i].data,
+                                (const char *)match->data);
+                        continue;
+                }
+                selftest(1, "passed");
+        }
+}
+
 static int __init of_selftest(void)
 {
         struct device_node *np;
@@ -316,6 +382,7 @@ static int __init of_selftest(void)
         of_selftest_property_match_string();
         of_selftest_parse_interrupts();
         of_selftest_parse_interrupts_extended();
+        of_selftest_match_node();
         pr_info("end of selftest - %i passed, %i failed\n",
                 selftest_results.passed, selftest_results.failed);
         return 0;
diff --git a/drivers/of/testcase-data/testcases.dtsi b/drivers/of/testcase-data/testcases.dtsi
index 3cc2f55534ac..3a5b75a8e4d7 100644
--- a/drivers/of/testcase-data/testcases.dtsi
+++ b/drivers/of/testcase-data/testcases.dtsi
@@ -1,2 +1,3 @@
 #include "tests-phandle.dtsi"
 #include "tests-interrupts.dtsi"
+#include "tests-match.dtsi"
diff --git a/drivers/of/testcase-data/tests-match.dtsi b/drivers/of/testcase-data/tests-match.dtsi
new file mode 100644
index 000000000000..c9e541129534
--- /dev/null
+++ b/drivers/of/testcase-data/tests-match.dtsi
@@ -0,0 +1,19 @@
+
+/ {
+        testcase-data {
+                match-node {
+                        name0 { };
+                        name1 { device_type = "type1"; };
+                        a { name2 { device_type = "type1"; }; };
+                        b { name2 { }; };
+                        c { name2 { device_type = "type2"; }; };
+                        name3 { compatible = "compat3"; };
+                        name4 { compatible = "compat2", "compat3"; };
+                        name5 { compatible = "compat2", "compat3"; };
+                        name6 { compatible = "compat1", "compat2", "compat3"; };
+                        name7 { compatible = "compat2"; device_type = "type1"; };
+                        name8 { compatible = "compat2"; device_type = "type1"; };
+                        name9 { compatible = "compat2"; };
+                };
+        };
+};