• Hans Verkuil's avatar
    media: tegra-cec: add Tegra HDMI CEC driver · 9d2d6068
    Hans Verkuil authored
    This driver adds support for the Tegra CEC IP. It is based on the
    NVIDIA drivers/misc/tegra-cec driver in their 3.10 kernel.
    
    This has been converted to the CEC framework and cleaned up.
    
    Tested with my Jetson TK1 board. It has also been tested with the
    Tegra X1 in an embedded product.
    
    Note of warning for the Tegra X2: this SoC supports two HDMI outputs,
    but only one CEC adapter and the CEC bus is shared between the
    two outputs. This is a design mistake and the CEC adapter can
    control only one HDMI output. Never hook up both HDMI outputs
    to the CEC bus in a hardware design: this is illegal as per the
    CEC specification.
    
    The CEC bus can be shared between multiple inputs and zero or one
    outputs, but not between multiple outputs.
    Signed-off-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
    Acked-by: default avatarThierry Reding <treding@nvidia.com>
    Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@osg.samsung.com>
    9d2d6068
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