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As a preparation to adding HDMI CEC helper code, add CEC-related fields to the struct drm_connector. The callbacks abstract CEC infrastructure in order to support CEC adapters and CEC notifiers in a universal way. CEC data is a void pointer as it allows us to make CEC data helper-specific. For example, currently it will be either cec_notifier or cec_adapter + drm_connector_hdmi_cec_funcs. Later cec-pin might store platform callbacks here. DP CEC might need to store AUX pointer, etc. Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Reviewed-by: Maxime Ripard <mripard@kernel.org> Link: https://lore.kernel.org/r/20250517-drm-hdmi-connector-cec-v6-3-35651db6f19b@oss.qualcomm.com Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>