Marvell PXA SSP CPU DAI bindings

Required properties:

	compatible	Must be "mrvl,pxa-ssp-dai"
	port		A phandle reference to a PXA ssp upstream device

Optional properties:

	clock-names
	clocks		Through "clock-names" and "clocks", external clocks
			can be configured. If a clock names "extclk" exists,
			it will be set to the mclk rate of the audio stream
			and be used as clock provider of the DAI.

Example:

	/* upstream device */

	ssp0: ssp@41000000 {
		compatible = "mrvl,pxa3xx-ssp";
		reg = <0x41000000 0x40>;
		interrupts = <24>;
		clock-names = "pxa27x-ssp.0";
		dmas = <&dma 13
			&dma 14>;
		dma-names = "rx", "tx";
	};

	/* DAI as user */

	ssp_dai0: ssp_dai@0 {
		compatible = "mrvl,pxa-ssp-dai";
		port = <&ssp0>;
	};