dt-bindings: i3c: Document Cadence I3C master bindings

Bindings for cadence I3C master block

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Required properties:

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- compatible: shall be "cdns,i3c-master"

- clocks: shall reference the pclk and sysclk

- clock-names: shall contain "pclk" and "sysclk"

- interrupts: the interrupt line connected to this I3C master

- reg: I3C master registers

Mandatory properties defined by the generic binding (see

Documentation/devicetree/bindings/i3c/i3c.txt for more details):

- #address-cells: shall be set to 1

- #size-cells: shall be set to 0

Optional properties defined by the generic binding (see

Documentation/devicetree/bindings/i3c/i3c.txt for more details):

- i2c-scl-hz

- i3c-scl-hz

I3C device connected on the bus follow the generic description (see

Documentation/devicetree/bindings/i3c/i3c.txt for more details).

Example:

	i3c-master@0d040000 {

		compatible = "cdns,i3c-master";

		clocks = <&coreclock>, <&i3csysclock>;

		clock-names = "pclk", "sysclk";

		interrupts = <3 0>;

		reg = <0x0d040000 0x1000>;

		#address-cells = <1>;

		#size-cells = <0>;

		i2c-scl-hz = <100000>;

		nunchuk: nunchuk@52 {

			compatible = "nintendo,nunchuk";

			reg = <0x52 0x80000010 0>;

		};

	};