* Texas Instruments OMAP2+ McBSP module

Required properties:
- compatible: "ti,omap2420-mcbsp" for McBSP on OMAP2420
	      "ti,omap2430-mcbsp" for McBSP on OMAP2430
	      "ti,omap3-mcbsp" for McBSP on OMAP3
	      "ti,omap4-mcbsp" for McBSP on OMAP4 and newer SoC
- reg: Register location and size, for OMAP4+ as an array:
       <MPU access base address, size>,
       <L3 interconnect address, size>;
- interrupts: Interrupt numbers for the McBSP port, as an array in case the
	      McBSP IP have more interrupt lines:
	<OCP compliant irq>,
	<TX irq>,
	<RX irq>;
- interrupt-parent: The parent interrupt controller
- ti,buffer-size: Size of the FIFO on the port (OMAP2430 and newer SoC)
- ti,hwmods: Name of the hwmod associated to the McBSP port

Sidetone support for OMAP3 McBSP2 and 3 ports:
- sidetone { }: Within this section the following parameters are required:
- reg: Register location and size for the ST block
- interrupts: The interrupt number for the ST block
- interrupt-parent: The parent interrupt controller for the ST block

Example:

mcbsp2: mcbsp@49022000 {
	compatible = "ti,omap3-mcbsp";
	#address-cells = <1>;
	#size-cells = <1>;
	reg = <0x49022000 0xff>;
	interrupts = <0 17 0x4>, /* OCP compliant interrup */
		     <0 62 0x4>, /* TX interrup */
		     <0 63 0x4>; /* RX interrup */
	interrupt-parent = <&intc>;
	ti,buffer-size = <1280>;
	ti,hwmods = "mcbsp2";

	sidetone {
		reg = <0x49028000 0xff>;
		interrupts = <0 4 0x4>;
		interrupt-parent = <&intc>;
	};
};