[libgpiod][PATCH v4 18/20] core: document gpiod_line_set_value_bulk NULL values behaviour

[Kent Gibson <warthog618@xxxxxxxxx>]

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@xxxxxxxxx>
---
 include/gpiod.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/gpiod.h b/include/gpiod.h
index 41527d3..0e9f125 100644
--- 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.
  *
-- 
2.24.0