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of: Add of_property_match_string() to find index into a string list

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Add a helper function for finding the index of a string in a string
list property.  This helper is useful for bindings that use a separate
*-name property for attaching names to tuples in another property such
as 'reg' or 'gpios'.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Grant Likely
2011-12-12 09:25:58 -07:00
parent dcd6c92267
commit 7aff0fe330
4 changed files with 70 additions and 0 deletions
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29
drivers/of/selftest.c
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@@ -120,6 +120,34 @@ static void __init of_selftest_parse_phandle_with_args(void)
pr_info("end - %s\n", passed_all ? "PASS" : "FAIL");
}
static void __init of_selftest_property_match_string(void)
{
struct device_node *np;
int rc;
pr_info("start\n");
np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
if (!np) {
pr_err("No testcase data in device tree\n");
return;
}
rc = of_property_match_string(np, "phandle-list-names", "first");
selftest(rc == 0, "first expected:0 got:%i\n", rc);
rc = of_property_match_string(np, "phandle-list-names", "second");
selftest(rc == 1, "second expected:0 got:%i\n", rc);
rc = of_property_match_string(np, "phandle-list-names", "third");
selftest(rc == 2, "third expected:0 got:%i\n", rc);
rc = of_property_match_string(np, "phandle-list-names", "fourth");
selftest(rc == -ENODATA, "unmatched string; rc=%i", rc);
rc = of_property_match_string(np, "missing-property", "blah");
selftest(rc == -EINVAL, "missing property; rc=%i", rc);
rc = of_property_match_string(np, "empty-property", "blah");
selftest(rc == -ENODATA, "empty property; rc=%i", rc);
rc = of_property_match_string(np, "unterminated-string", "blah");
selftest(rc == -EILSEQ, "unterminated string; rc=%i", rc);
}
static int __init of_selftest(void)
{
struct device_node *np;
@@ -133,6 +161,7 @@ static int __init of_selftest(void)
pr_info("start of selftest - you will see error messages\n");
of_selftest_parse_phandle_with_args();
of_selftest_property_match_string();
pr_info("end of selftest - %s\n", selftest_passed ? "PASS" : "FAIL");
return 0;
}