To enable audio functionality add ' xlnx,audio-enabled ' entry to HDMI TX/RX Video DT nodes. Find at below links. https://github.com/Xilinx/hdmi-modules/blob/master/Documentation/devicetree/bindings/xlnx%2Cv-hdmi-rx-ss.txt#L99 https://github.com/Xilinx/hdmi-modules/blob/master/Documentation/devicetree/bindings/xlnx%2Cv-hdmi-tx-ss.txt#L137