dt-bindings: soundwire: add bindings for Qcom controller

Qualcomm SoundWire Controller Bindings

This binding describes the Qualcomm SoundWire Controller along with its

board specific bus parameters.

- compatible:

	Usage: required

	Value type: <stringlist>

	Definition: must be "qcom,soundwire-v<MAJOR>.<MINOR>.<STEP>",

		    Example:

			"qcom,soundwire-v1.3.0"

			"qcom,soundwire-v1.5.0"

			"qcom,soundwire-v1.6.0"

- reg:

	Usage: required

	Value type: <prop-encoded-array>

	Definition: the base address and size of SoundWire controller

		    address space.

- interrupts:

	Usage: required

	Value type: <prop-encoded-array>

	Definition: should specify the SoundWire Controller IRQ

- clock-names:

	Usage: required

	Value type: <stringlist>

	Definition: should be "iface" for SoundWire Controller interface clock

- clocks:

	Usage: required

	Value type: <prop-encoded-array>

	Definition: should specify the SoundWire Controller interface clock

- #sound-dai-cells:

	Usage: required

	Value type: <u32>

	Definition: must be 1 for digital audio interfaces on the controller.

- qcom,dout-ports:

	Usage: required

	Value type: <u32>

	Definition: must be count of data out ports

- qcom,din-ports:

	Usage: required

	Value type: <u32>

	Definition: must be count of data in ports

- qcom,ports-offset1:

	Usage: required

	Value type: <prop-encoded-array>

	Definition: should specify payload transport window offset1 of each

		    data port. Out ports followed by In ports.

		    More info in MIPI Alliance SoundWire 1.0 Specifications.

- qcom,ports-offset2:

	Usage: required

	Value type: <prop-encoded-array>

	Definition: should specify payload transport window offset2 of each

		    data port. Out ports followed by In ports.

		    More info in MIPI Alliance SoundWire 1.0 Specifications.

- qcom,ports-sinterval-low:

	Usage: required

	Value type: <prop-encoded-array>

	Definition: should be sample interval low of each data port.

		    Out ports followed by In ports. Used for Sample Interval

		    calculation.

		    More info in MIPI Alliance SoundWire 1.0 Specifications.

- qcom,ports-word-length:

	Usage: optional

	Value type: <prop-encoded-array>

	Definition: should be size of payload channel sample.

		    More info in MIPI Alliance SoundWire 1.0 Specifications.

- qcom,ports-block-pack-mode:

	Usage: optional

	Value type: <prop-encoded-array>

	Definition: should be 0 or 1 to indicate the block packing mode.

		    0 to indicate Blocks are per Channel

		    1 to indicate Blocks are per Port.

		    Out ports followed by In ports.

		    More info in MIPI Alliance SoundWire 1.0 Specifications.

- qcom,ports-block-group-count:

	Usage: optional

	Value type: <prop-encoded-array>

	Definition: should be in range 1 to 4 to indicate how many sample

		    intervals are combined into a payload.

		    Out ports followed by In ports.

		    More info in MIPI Alliance SoundWire 1.0 Specifications.

- qcom,ports-lane-control:

	Usage: optional

	Value type: <prop-encoded-array>

	Definition: should be in range 0 to 7 to identify which	data lane

		    the data port uses.

		    Out ports followed by In ports.

		    More info in MIPI Alliance SoundWire 1.0 Specifications.

- qcom,ports-hstart:

	Usage: optional

	Value type: <prop-encoded-array>

	Definition: should be number identifying lowerst numbered coloum in

		    SoundWire Frame, i.e. left edge of the Transport sub-frame

		    for each port. Values between 0 and 15 are valid.

		    Out ports followed by In ports.

		    More info in MIPI Alliance SoundWire 1.0 Specifications.

- qcom,ports-hstop:

	Usage: optional

	Value type: <prop-encoded-array>

	Definition: should be number identifying highest numbered coloum in

		    SoundWire Frame, i.e. the right edge of the Transport

		    sub-frame for each port. Values between 0 and 15 are valid.

		    Out ports followed by In ports.

		    More info in MIPI Alliance SoundWire 1.0 Specifications.

- qcom,dports-type:

	Usage: optional

	Value type: <prop-encoded-array>

	Definition: should be one of the following types

		    0 for reduced port

		    1 for simple ports

		    2 for full port

		    Out ports followed by In ports.

		    More info in MIPI Alliance SoundWire 1.0 Specifications.

Note:

	More Information on detail of encoding of these fields can be

found in MIPI Alliance SoundWire 1.0 Specifications.

= SoundWire devices

Each subnode of the bus represents SoundWire device attached to it.

The properties of these nodes are defined by the individual bindings.

= EXAMPLE

The following example represents a SoundWire controller on DB845c board

which has controller integrated inside WCD934x codec on SDM845 SoC.

soundwire: soundwire@c85 {

	compatible = "qcom,soundwire-v1.3.0";

	reg = <0xc85 0x20>;

	interrupts = <20 IRQ_TYPE_EDGE_RISING>;

	clocks = <&wcc>;

	clock-names = "iface";

	#sound-dai-cells = <1>;

	qcom,dports-type = <0>;

	qcom,dout-ports	= <6>;

	qcom,din-ports	= <2>;

	qcom,ports-sinterval-low = /bits/ 8  <0x07 0x1F 0x3F 0x7 0x1F 0x3F 0x0F 0x0F>;

	qcom,ports-offset1 = /bits/ 8 <0x01 0x02 0x0C 0x6 0x12 0x0D 0x07 0x0A >;

	qcom,ports-offset2 = /bits/ 8 <0x00 0x00 0x1F 0x00 0x00 0x1F 0x00 0x00>;

	/* Left Speaker */

	left{

		....

	};

	/* Right Speaker */

	right{

		....

	};

};