The "rotation" fwnode device property is intended to allow specify the
sensor's physical mounting rotation, so that it can be exposed through
the read-only V4L2_CID_CAMERA_SENSOR_ROTATION control and applications
can decide how to compensate for that.

The imx258 driver has read-only VFLIP and HFLIP enabled, resulting in
a 180 degrees image rotation being produced by the sensor. But this
doesn't imply that the physical mounting rotation should match the
driver's implementation.

Now that the driver registers V4L2_CID_CAMERA_SENSOR_ROTATION
and V4L2_CID_HFLIP/VFLIP correctly, userspace has all the required
information to handle the rotation correctly, hence it is not necessary
to require the 'rotation' property to be fixed to 180 degrees in DTS.
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>