Documentation: bindings: move the Berlin clock documentation

		"simple-mfd", "syscon"

- reg: address and length of the system control register set

* Clock provider binding

As clock related registers are spread among the chip control registers, the

chip control node also provides the clocks. Marvell Berlin2 (BG2, BG2CD, BG2Q)

SoCs share the same IP for PLLs and clocks, with some minor differences in

features and register layout.

Required properties:

- #clock-cells: shall be set to 1

- clocks: clock specifiers referencing the core clock input clocks

- clock-names: array of strings describing the input clock specifiers above.

    Allowed clock-names for the reference clocks are

      "refclk" for the SoCs osciallator input on all SoCs,

    and SoC-specific input clocks for

      BG2/BG2CD: "video_ext0" for the external video clock input

Clocks provided by core clocks shall be referenced by a clock specifier

indexing one of the provided clocks. Refer to dt-bindings/clock/berlin<soc>.h

for the corresponding index mapping.

Example:

chip: chip-control@ea0000 {

	compatible = "marvell,berlin2-chip-ctrl", "simple-mfd", "syscon";

	#clock-cells = <1>;

	reg = <0xea0000 0x400>;

	clocks = <&refclk>, <&externaldev 0>;

	clock-names = "refclk", "video_ext0";

	/* sub-device nodes */

};

sysctrl: system-controller@d000 {

	compatible = "marvell,berlin2-system-ctrl", "simple-mfd", "syscon";

	reg = <0xd000 0x100>;

	/* sub-device nodes */

};

Device Tree Clock bindings for Marvell Berlin

This binding uses the common clock binding[1].

[1] Documentation/devicetree/bindings/clock/clock-bindings.txt

Clock related registers are spread among the chip control registers. Berlin

clock node should be a sub-node of the chip controller node. Marvell Berlin2

(BG2, BG2CD, BG2Q) SoCs share the same IP for PLLs and clocks, with some

minor differences in features and register layout.

Required properties:

- compatible: must be "marvell,berlin2-clk" or "marvell,berlin2q-clk"

- #clock-cells: must be 1

- clocks: must be the input parent clock phandle

- clock-names: name of the input parent clock

	Allowed clock-names for the reference clocks are

	"refclk" for the SoCs oscillator input on all SoCs,

	and SoC-specific input clocks for

	BG2/BG2CD: "video_ext0" for the external video clock input

Example:

chip_clk: clock {

	compatible = "marvell,berlin2q-clk";

	#clock-cells = <1>;

	clocks = <&refclk>;

	clock-names = "refclk";

};