* TI - MPU (Main Processor Unit) subsystem

The MPU subsystem contain one or several ARM cores
depending of the version.
The MPU contain CPUs, GIC, L2 cache and a local PRCM.

Required properties:
- compatible : Should be "ti,omap3-mpu" for OMAP3
               Should be "ti,omap4-mpu" for OMAP4
	       Should be "ti,omap5-mpu" for OMAP5
- ti,hwmods: "mpu"

Optional properties:
- sram:	Phandle to the ocmcram node

am335x and am437x only:
- pm-sram: Phandles to ocmcram nodes to be used for power management.
	   First should be type 'protect-exec' for the driver to use to copy
	   and run PM functions, second should be regular pool to be used for
	   data region for code. See Documentation/devicetree/bindings/sram/sram.txt
	   for more details.

Examples:

- For an OMAP5 SMP system:

mpu {
    compatible = "ti,omap5-mpu";
    ti,hwmods = "mpu"
};

- For an OMAP4 SMP system:

mpu {
    compatible = "ti,omap4-mpu";
    ti,hwmods = "mpu";
};


- For an OMAP3 monocore system:

mpu {
    compatible = "ti,omap3-mpu";
    ti,hwmods = "mpu";
};

- For an AM335x system:

mpu {
	compatible = "ti,omap3-mpu";
	ti,hwmods = "mpu";
	pm-sram = <&pm_sram_code
		   &pm_sram_data>;
};