doc: document gpiod_line_set_value_bulk NULL values behaviour

The handling of NULL values by gpiod_line_set_value_bulk has been changed
to interpret NULL as low values for all lines. This patch updates the
documentation of the function to describe that.

Signed-off-by: Kent Gibson <warthog618@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

diff --git a/include/gpiod.h b/include/gpiod.h
index 03fd4daf4682b70fb9d342a482cabebb220c1970..0ecb804a96cf50687fa40e38f2ae42f69e915888 100644 (file)
--- a/include/gpiod.h
+++ b/include/gpiod.h
@@ -1296,6 +1296,7 @@ int gpiod_line_set_value(struct gpiod_line *line, int value) GPIOD_API;
  * @brief Set the values of a set of GPIO lines.
  * @param bulk Set of GPIO lines to reserve.
  * @param values An array holding line_bulk->num_lines new values for lines.
+ *               A NULL pointer is interpreted as a logical low for all lines.
  * @return 0 is the operation succeeds. In case of an error this routine
  *         returns -1 and sets the last error number.
  *