[media] dt-bindings: media: Add MAX2175 binding description

Maxim Integrated MAX2175 RF to Bits tuner

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The MAX2175 IC is an advanced analog/digital hybrid-radio receiver with

RF to Bits® front-end designed for software-defined radio solutions.

Required properties:

--------------------

- compatible: "maxim,max2175" for MAX2175 RF-to-bits tuner.

- clocks: clock specifier.

- port: child port node corresponding to the I2S output, in accordance with

	the video interface bindings defined in

	Documentation/devicetree/bindings/media/video-interfaces.txt. The port

	node must contain at least one endpoint.

Optional properties:

--------------------

- maxim,master	      : phandle to the master tuner if it is a slave. This

			is used to define two tuners in diversity mode

			(1 master, 1 slave). By default each tuner is an

			individual master.

- maxim,refout-load   : load capacitance value (in picofarads) on reference

			output drive level. The possible load values are:

			 0 (default - refout disabled)

			10

			20

			30

			40

			60

			70

- maxim,am-hiz-filter : empty property indicates the AM Hi-Z filter is used

			in this hardware for AM antenna input.

Example:

--------

Board specific DTS file

/* Fixed XTAL clock node */

maxim_xtal: clock {

	compatible = "fixed-clock";

	#clock-cells = <0>;

	clock-frequency = <36864000>;

};

/* A tuner device instance under i2c bus */

max2175_0: tuner@60 {

	compatible = "maxim,max2175";

	reg = <0x60>;

	clocks = <&maxim_xtal>;

	maxim,refout-load = <10>;

	port {

		max2175_0_ep: endpoint {

			remote-endpoint = <&slave_rx_device>;

		};

	};

};

-ohms		: Ohms

-micro-ohms	: micro Ohms

-microvolt	: micro volts

-picofarads	: picofarads

Temperature

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