dt-bindings: memory: Add pl353 smc controller devicetree binding information

Device tree bindings for ARM PL353 static memory controller

PL353 static memory controller supports two kinds of memory

interfaces.i.e NAND and SRAM/NOR interfaces.

The actual devices are instantiated from the child nodes of pl353 smc node.

Required properties:

- compatible		: Should be "arm,pl353-smc-r2p1", "arm,primecell".

- reg			: Controller registers map and length.

- clock-names		: List of input clock names - "memclk", "apb_pclk"

			  (See clock bindings for details).

- clocks		: Clock phandles (see clock bindings for details).

- address-cells		: Must be 2.

- size-cells		: Must be 1.

Child nodes:

 For NAND the "arm,pl353-nand-r2p1" and for NOR the "cfi-flash" drivers are

supported as child nodes.

for NAND partition information please refer the below file

Documentation/devicetree/bindings/mtd/partition.txt

Example:

	smcc: memory-controller@e000e000

			compatible = "arm,pl353-smc-r2p1", "arm,primecell";

			clock-names = "memclk", "apb_pclk";

			clocks = <&clkc 11>, <&clkc 44>;

			reg = <0xe000e000 0x1000>;

			#address-cells = <2>;

			#size-cells = <1>;

			ranges = <0x0 0x0 0xe1000000 0x1000000 //Nand CS Region

				  0x1 0x0 0xe2000000 0x2000000 //SRAM/NOR CS Region

				  0x2 0x0 0xe4000000 0x2000000>; //SRAM/NOR CS Region

			nand_0: flash@e1000000 {

				compatible = "arm,pl353-nand-r2p1"

				reg = <0 0 0x1000000>;

				(...)

			};

			nor0: flash@e2000000 {

				compatible = "cfi-flash";

				reg = <1 0 0x2000000>;

			};

			nor1: flash@e4000000 {

				compatible = "cfi-flash";

				reg = <2 0 0x2000000>;

			};

	};