dt-bindings: Introduce interconnect binding

Interconnect Provider Device Tree Bindings

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

The purpose of this document is to define a common set of generic interconnect

providers/consumers properties.

= interconnect providers =

The interconnect provider binding is intended to represent the interconnect

controllers in the system. Each provider registers a set of interconnect

nodes, which expose the interconnect related capabilities of the interconnect

to consumer drivers. These capabilities can be throughput, latency, priority

etc. The consumer drivers set constraints on interconnect path (or endpoints)

depending on the use case. Interconnect providers can also be interconnect

consumers, such as in the case where two network-on-chip fabrics interface

directly.

Required properties:

- compatible : contains the interconnect provider compatible string

- #interconnect-cells : number of cells in a interconnect specifier needed to

			encode the interconnect node id

Example:

		snoc: interconnect@580000 {

			compatible = "qcom,msm8916-snoc";

			#interconnect-cells = <1>;

			reg = <0x580000 0x14000>;

			clock-names = "bus_clk", "bus_a_clk";

			clocks = <&rpmcc RPM_SMD_SNOC_CLK>,

				 <&rpmcc RPM_SMD_SNOC_A_CLK>;

		};

= interconnect consumers =

The interconnect consumers are device nodes which dynamically express their

bandwidth requirements along interconnect paths they are connected to. There

can be multiple interconnect providers on a SoC and the consumer may consume

multiple paths from different providers depending on use case and the

components it has to interact with.

Required properties:

interconnects : Pairs of phandles and interconnect provider specifier to denote

	        the edge source and destination ports of the interconnect path.

Optional properties:

interconnect-names : List of interconnect path name strings sorted in the same

		     order as the interconnects property. Consumers drivers will use

		     interconnect-names to match interconnect paths with interconnect

		     specifier pairs.

Example:

	sdhci@7864000 {

		...

		interconnects = <&pnoc MASTER_SDCC_1 &bimc SLAVE_EBI_CH0>;

		interconnect-names = "sdhc-mem";

	};