dt-bindings: remoteproc: Add bindings for Davinci DSP processors

TI Davinci DSP devices

=======================

Binding status: Unstable - Subject to changes for DT representation of clocks

			   and resets

The TI Davinci family of SoCs usually contains a TI DSP Core sub-system that

is used to offload some of the processor-intensive tasks or algorithms, for

achieving various system level goals.

The processor cores in the sub-system usually contain additional sub-modules

like L1 and/or L2 caches/SRAMs, an Interrupt Controller, an external memory

controller, a dedicated local power/sleep controller etc. The DSP processor

core used in Davinci SoCs is usually a C674x DSP CPU.

DSP Device Node:

================

Each DSP Core sub-system is represented as a single DT node.

Required properties:

--------------------

The following are the mandatory properties:

- compatible:		Should be one of the following,

			    "ti,da850-dsp" for DSPs on OMAP-L138 SoCs

- reg:			Should contain an entry for each value in 'reg-names'.

			Each entry should have the memory region's start address

			and the size of the region, the representation matching

			the parent node's '#address-cells' and '#size-cells' values.

- reg-names:		Should contain strings with the following names, each

			representing a specific internal memory region or a

			specific register space,

			     "l2sram", "l1pram", "l1dram", "host1cfg", "chipsig_base"

- interrupts: 		Should contain the interrupt number used to receive the

			interrupts from the DSP. The value should follow the

			interrupt-specifier format as dictated by the

			'interrupt-parent' node.

- memory-region:	phandle to the reserved memory node to be associated

			with the remoteproc device. The reserved memory node

			can be a CMA memory node, and should be defined as

			per the bindings in

			Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt

Optional properties:

--------------------

- interrupt-parent:	phandle to the interrupt controller node. This property

			is needed if the device node hierarchy doesn't have an

			interrupt controller.

Example:

--------

	/* DSP Reserved Memory node */

	reserved-memory {

		#address-cells = <1>;

		#size-cells = <1>;

		ranges;

		dsp_memory_region: dsp-memory@c3000000 {

			compatible = "shared-dma-pool";

			reg = <0xc3000000 0x1000000>;

			reusable;

		};

	};

	/* DSP node */

	{

		dsp: dsp@11800000 {

			compatible = "ti,da850-dsp";

			reg = <0x11800000 0x40000>,

			      <0x11e00000 0x8000>,

			      <0x11f00000 0x8000>,

			      <0x01c14044 0x4>,

			      <0x01c14174 0x8>;

			reg-names = "l2sram", "l1pram", "l1dram", "host1cfg",

				    "chipsig";

			interrupt-parent = <&intc>;

			interrupts = <28>;

			memory-region = <&dsp_memory_region>;

		};

	};