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Add a V4L2_CID_FLASH_DURATION control to set the duration of a flash/strobe pulse. This controls the length of the flash/strobe pulse output by device (typically a camera sensor) and connected to the flash controller. This is different to the V4L2_CID_FLASH_TIMEOUT control, which is implemented by the flash controller and defines a limit after which the flash is "forcefully" turned off again. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Richard Leitner <richard.leitner@linux.dev> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>