On Tue, May 16, 2017 at 12:13 PM, Hans Verkuil <hverkuil@xxxxxxxxx> wrote: > It needs something like this (taken from rcar-vin.c): > > ret = v4l2_ctrl_add_handler(&vin->ctrl_handler, sd->ctrl_handler, NULL); > if (ret < 0) > return ret; > Thank you . That did the trick. Continuing on the topic of backporting the driver the 4.12 driver to 4.4... should I submit my modified version of the driver to this list for review and possible inclusion in the 4.4 kernel tree? --wpd