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Each HSI port is supposed to have one child node, which
symbols the remote device connected to the HSI port. The
following properties are standardized for HSI clients:

Required HSI configuration properties:

- hsi-channel-ids:	A list of channel ids

- hsi-rx-mode:		Receiver Bit transmission mode ("stream" or "frame")
- hsi-tx-mode:		Transmitter Bit transmission mode ("stream" or "frame")
- hsi-mode:		May be used instead hsi-rx-mode and hsi-tx-mode if
			the transmission mode is the same for receiver and
			transmitter
- hsi-speed-kbps:	Max bit transmission speed in kbit/s
- hsi-flow:		RX flow type ("synchronized" or "pipeline")
- hsi-arb-mode:		Arbitration mode for TX frame ("round-robin", "priority")

Optional HSI configuration properties:

- hsi-channel-names:	A list with one name per channel specified in the
			hsi-channel-ids property


Device Tree node example for an HSI client:

hsi-controller {
	hsi-port {
		modem: hsi-client {
			compatible = "nokia,n900-modem";

			hsi-channel-ids = <0>, <1>, <2>, <3>;
			hsi-channel-names = "mcsaab-control",
					    "speech-control",
					    "speech-data",
					    "mcsaab-data";
			hsi-speed-kbps = <55000>;
			hsi-mode = "frame";
			hsi-flow = "synchronized";
			hsi-arb-mode = "round-robin";

			/* more client specific properties */
		};
	};
};