• Mauro Carvalho Chehab's avatar
    media: Kconfig: cleanup VIDEO_DEV dependencies · 9958d30f
    Mauro Carvalho Chehab authored
    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: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
    Reviewed-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
    Reviewed-by: default avatarJacopo Mondi <jacopo@jmondi.org>
    Reviewed-by: Neil Armstrong <narmstrong@baylibre.com> # for meson-vdec & meson-ge2d
    Acked-by: default avatarAndrzej Pietrasiewicz <andrzejtp2010@gmail.com>
    Acked-by: default avatarŁukasz Stelmach <l.stelmach@samsung.com>
    Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@kernel.org>
    9958d30f
Kconfig 18.2 KB