dt-bindings: soc: qcom: Introduce Glink Probe bindings

Qualcomm Technologies, Inc. GLINK Probe

This binding describes the GLINK Probe driver, a device

that initializes the GLINK edge pairs within the system.

- compatible :

	Usage: required

	Value type: <stringlist>

	Definition: must be "qcom,glink"

= SUBNODES

The GLINK probe node must contain subnodes that describes the

edge-pairs. See qcom,glink.txt for details on how to describe them.

In addition to the properties in qcom,glink.txt, The GLINK Probe driver

requires the qcom,glink-label and transport type to be specified in the

subnodes.

- transport :

	Usage: required

	Value type: <stringlist>

	Definition: must be "smem", "spss", or "spi"

- qcom,glink-label :

	Usage: required

	Value type: <stringlist>

	Definition: specifies the identifier of the remote proc of this edge.

= GLINK_SSR

The GLINK probe driver also initializes the GLINK_SSR channel for the edges

that it brings up. The channel should be specified as a subnode to each edge. In

addition to the properties in qcom,glink.txt to specify a channel device node,

the qcom,notify-edges property must be defined.

- qcom,notify-edges :

	Usage: required

	Value type: <prop-encoded-array>

	Definition: list of phandles that specify the subsystems this glink edge

		    needs to receive ssr notifications about.

= EXAMPLE

qcom,glink {

	compatible = "qcom,glink";

	glink_modem: modem {

		transport = "smem";

		qcom,remote-pid = <0>;

		mboxes = <&apcs_glb 8>;

		mbox-names = "mpss_smem";

		interrupts = <GIC_SPI 449 IRQ_TYPE_EDGE_RISING>;

		qcom,modem_glink_ssr {

			qcom,glink-channels = "glink_ssr";

			qcom,notify-edges = <&glink_adsp>;

		};

	};

	glink_adsp: adsp {

		transport = "smem";

		qcom,remote-pid = <2>;

		mboxes = <&apcs_glb 4>;

		mbox-names = "adsp_smem";

		interrupts = <GIC_SPI 348 IRQ_TYPE_EDGE_RISING>;

		qcom,modem_glink_ssr {

			qcom,glink-channels = "glink_ssr";

			qcom,notify-edges = <&glink_modem>;

		};

	};

};