Device-Tree bindings for the NXP TDA998x HDMI transmitter

Required properties;
  - compatible: must be "nxp,tda998x"

  - reg: I2C address

Required node:
  - port: Input port node with endpoint definition, as described
        in Documentation/devicetree/bindings/graph.txt

Optional properties:
  - interrupts: interrupt number and trigger type
	default: polling

  - pinctrl-0: pin control group to be used for
	screen plug/unplug interrupt.

  - pinctrl-names: must contain a "default" entry.

  - video-ports: 24 bits value which defines how the video controller
	output is wired to the TDA998x input - default: <0x230145>

  - audio-ports: array of 8-bit values, 2 values per one DAI[1].
	The first value defines the DAI type: TDA998x_SPDIF or TDA998x_I2S[2].
	The second value defines the tda998x AP_ENA reg content when the DAI
	in question is used. The implementation allows one or two DAIs. If two
	DAIs are defined, they must be of different type.

  - nxp,calib-gpios: calibration GPIO, which must correspond with the
	gpio used for the TDA998x interrupt pin.

[1] Documentation/sound/soc/dai.rst
[2] include/dt-bindings/display/tda998x.h

Example:

#include <dt-bindings/display/tda998x.h>

	tda998x: hdmi-encoder {
		compatible = "nxp,tda998x";
		reg = <0x70>;
		interrupt-parent = <&gpio0>;
		interrupts = <27 2>;		/* falling edge */
		pinctrl-0 = <&pmx_camera>;
		pinctrl-names = "default";
		video-ports = <0x230145>;

		#sound-dai-cells = <2>;
			     /*	DAI-format	AP_ENA reg value */
		audio-ports = <	TDA998x_SPDIF	0x04
				TDA998x_I2S	0x03>;

	};