dt-bindings: nvmem: add description for UniPhier eFuse

= UniPhier eFuse device tree bindings =

This UniPhier eFuse must be under soc-glue.

Required properties:

- compatible: should be "socionext,uniphier-efuse"

- reg: should contain the register location and length

= Data cells =

Are child nodes of efuse, bindings of which as described in

bindings/nvmem/nvmem.txt

Example:

	soc-glue@5f900000 {

		compatible = "socionext,uniphier-ld20-soc-glue-debug",

			     "simple-mfd";

		#address-cells = <1>;

		#size-cells = <1>;

		ranges = <0x0 0x5f900000 0x2000>;

		efuse@100 {

			compatible = "socionext,uniphier-efuse";

			reg = <0x100 0x28>;

		};

		efuse@200 {

			compatible = "socionext,uniphier-efuse";

			reg = <0x200 0x68>;

			#address-cells = <1>;

			#size-cells = <1>;

			/* Data cells */

			usb_mon: usb-mon@54 {

				reg = <0x54 0xc>;

			};

		};

	};

= Data consumers =

Are device nodes which consume nvmem data cells.

Example:

	usb {

		...

		nvmem-cells = <&usb_mon>;

		nvmem-cell-names = "usb_mon";

	}