Hello, This small patch series comes from a mild annoyance I experienced during a recent patch review, where I wanted to ask for a pointer to a v4l2_subdev_state used to access the state in a read-only fashion to be made const. This wasn't possible as the state accessors functions take a non-const state pointer, in order to return pointers to mutable formats and selection rectangles. Patch 1/2 improves the state accessors to support const states, in the same wait as the recently introduced container_of_const() macro. Bikeshedding of the internal macro and function names is expected. Patch 2/2 then shows how this can be used in one driver. Compared to v1, patch 1/2 uses _Generic() in a single macro to wrap all calls, instead of duplicating the _Generic() statement in all accessors. Laurent Pinchart (2): media: v4l2-subdev: Provide const-aware subdev state accessors media: rkisp1: Mark subdev state pointers as const .../platform/rockchip/rkisp1/rkisp1-isp.c | 8 ++-- .../platform/rockchip/rkisp1/rkisp1-resizer.c | 8 ++-- include/media/v4l2-subdev.h | 40 +++++++++++++------ 3 files changed, 35 insertions(+), 21 deletions(-) base-commit: e695668af8523b059127dfa8b261c76e7c9cde10 -- Regards, Laurent Pinchart
