Qualcomm Technologies, Inc. G-link Mailbox Transport

Required properties:
-compatible : should be "qcom,glink-mailbox-xprt"
-reg : the mailbox register to store the location of the fifo
	the mailbox register to store the size of the fifo
	the irq register base address for triggering interrupts
	the register to enable sending interrupts
	the register to reset the rx irq line
-reg-names : "mbox-loc-addr" - string to identify the mailbox location reg
		"mbox-loc-size" - string to identify the mailbox size reg
		"irq-reg-base" - string to identify the irq register region
		"irq-rx-reset" - string to identify the rx irq reset register
-qcom,irq-mask : the bitmask to trigger an interrupt
-interrupts : the receiving interrupt line
-label : the name of the subsystem this link connects to
-qcom,tx-ring-size: size of the transmit ring buffer in bytes
-qcom,rx-ring-size: size of the receive ring buffer in bytes

Example:

	qcom,glink-mailbox-xprt-spss@1d05008 {
		compatible = "qcom,glink-mailbox-xprt";
		reg = <0x1d05008 0x8>,
			<0x1d05010 0x4>,
			<0x1d06004 0x4>,
			<0x1d06020 0x4>;
		reg-names = "mbox-loc-addr", "mbox-loc-size", "irq-reg-base",
			"irq-rx-reset";
		qcom,irq-mask = <0x1000>;
		interrupts = <0 25 4>;
		label = "spss";
		qcom,tx-ring-size = <0x400>;
		qcom,rx-ring-size = <0x400>;
	};
