tests: document the freq argument in test_set_event()

The freq argument is not documented and it's not clear what it means.
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Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

diff --git a/tests/gpiod-test.h b/tests/gpiod-test.h
index b97cd476e75f95b983009ecc9003ce9a7531a261..040d993f39384c5e205cb64ffa92b05a40398065 100644 (file)
--- a/tests/gpiod-test.h
+++ b/tests/gpiod-test.h
@@ -93,6 +93,7 @@ const char *test_chip_path(unsigned int index);
 const char *test_chip_name(unsigned int index);
 unsigned int test_chip_num(unsigned int index);
 
+/* Last argument is the delay between line value switches in microseconds. */
 void test_set_event(unsigned int chip_index,
                    unsigned int line_offset, unsigned int freq);