It was <2022-03-14 pon 17:35>, when Mauro Carvalho Chehab wrote:
> media Kconfig has two entries associated to V4L API:
> VIDEO_DEV and VIDEO_V4L2.
>
> On Kernel 2.6.x, there were two V4L APIs, each one with its own flag.
> VIDEO_DEV were meant to:
> 1) enable Video4Linux and make its Kconfig options to appear;
> 2) it makes the Kernel build the V4L core.
>
> while VIDEO_V4L2 where used to distinguish between drivers that
> implement the newer API and drivers that implemented the former one.
>
> With time, such meaning changed, specially after the removal of
> all V4L version 1 drivers.
>
> At the current implementation, VIDEO_DEV only does (1): it enables
> the media options related to V4L, that now has:
>
> menu "Video4Linux options"
> visible if VIDEO_DEV
>
> source "drivers/media/v4l2-core/Kconfig"
> endmenu
>
> but it doesn't affect anymore the V4L core drivers.
>
> The rationale is that the V4L2 core has a "soft" dependency
> at the I2C bus, and now requires to select a number of other
> Kconfig options:
>
> config VIDEO_V4L2
> tristate
> depends on (I2C || I2C=n) && VIDEO_DEV
> select RATIONAL
> select VIDEOBUF2_V4L2 if VIDEOBUF2_CORE
> default (I2C || I2C=n) && VIDEO_DEV
>
> In the past, merging them would be tricky, but it seems that it is now
> possible to merge those symbols, in order to simplify V4L dependencies.
>
> Let's keep VIDEO_DEV, as this one is used on some make *defconfig
> configurations.
>
> Suggested-by: Laurent Pinchart
> Reviewed-by: Laurent Pinchart
> Reviewed-by: Jacopo Mondi
> Signed-off-by: Mauro Carvalho Chehab
> ---
>
> To avoid mailbombing on a large number of people, only mailing lists were C/C
> on the cover.
> See [PATCH v2 00/67] at:
> https://lore.kernel.org/all/cover.1647274406.git.mche...@kernel.org/
>
> drivers/input/rmi4/Kconfig| 2 +-
> drivers/input/touchscreen/Kconfig | 4 +-
> drivers/media/Kconfig | 3 +
> drivers/media/common/saa7146/Kconfig | 2 +-
> drivers/media/dvb-core/Kconfig| 2 +-
> drivers/media/dvb-frontends/Kconfig | 4 +-
> drivers/media/i2c/Kconfig | 250 +-
> drivers/media/i2c/ccs/Kconfig | 2 +-
> drivers/media/i2c/cx25840/Kconfig | 2 +-
> drivers/media/i2c/et8ek8/Kconfig | 2 +-
> drivers/media/i2c/m5mols/Kconfig | 2 +-
> drivers/media/pci/Kconfig | 2 +-
> drivers/media/pci/bt8xx/Kconfig | 2 +-
> drivers/media/pci/cobalt/Kconfig | 2 +-
> drivers/media/pci/cx18/Kconfig| 2 +-
> drivers/media/pci/dt3155/Kconfig | 2 +-
> drivers/media/pci/intel/ipu3/Kconfig | 2 +-
> drivers/media/pci/ivtv/Kconfig| 2 +-
> drivers/media/pci/meye/Kconfig| 2 +-
> drivers/media/pci/saa7146/Kconfig | 6 +-
> drivers/media/pci/sta2x11/Kconfig | 2 +-
> drivers/media/pci/tw5864/Kconfig | 2 +-
> drivers/media/pci/tw68/Kconfig| 2 +-
> drivers/media/pci/tw686x/Kconfig | 2 +-
> drivers/media/platform/Kconfig| 6 +-
> drivers/media/platform/allegro-dvt/Kconfig| 2 +-
> .../platform/allwinner/sun4i-csi/Kconfig | 2 +-
> .../platform/allwinner/sun6i-csi/Kconfig | 2 +-
> .../media/platform/allwinner/sun8i-di/Kconfig | 2 +-
> .../platform/allwinner/sun8i-rotate/Kconfig | 2 +-
> .../media/platform/amlogic/meson-ge2d/Kconfig | 2 +-
> drivers/media/platform/amphion/Kconfig| 1 -
> drivers/media/platform/aspeed/Kconfig | 2 +-
> drivers/media/platform/atmel/Kconfig | 8 +-
> drivers/media/platform/cadence/Kconfig| 4 +-
> drivers/media/platform/chips-media/Kconfig| 2 +-
> drivers/media/platform/intel/Kconfig | 2 +-
> drivers/media/platform/marvell/Kconfig| 4 +-
> .../media/platform/mediatek/mtk-jpeg/Kconfig | 2 +-
> .../media/platform/mediatek/mtk-mdp/Kconfig | 2 +-
> .../platform/mediatek/mtk-vcodec/Kconfig | 2 +-
> .../media/platform/mediatek/mtk-vpu/Kconfig | 2 +-
> .../media/platform/nvidia/tegra-vde/Kconfig | 2 +-
> drivers/media/platform/nxp/Kconfig| 6 +-
> drivers/media/platform/nxp/imx-jpeg/Kconfig | 2 +-
> drivers/media/platform/qcom/camss/Kconfig | 2 +-
> drivers/media/platform/qcom/venus/Kconfig | 2 +-
> drivers/media/platform/renesas/Kconfig| 30 +--
> .../media/platform/renesas/rcar-vin/Kconfig | 4 +-
> drivers/media/platform/rockchip/rga/Kconfig | 2 +-
> .../media/platform/rockchip/rkisp1/Kconfig| 2 +-
> .../media/platform/samsung/exynos-gsc/Kconfig | 2 +-
> .../media/platform/samsung/exynos4-is/Kconfig | 2 +-
> .../medi
